Drive Coroutine Desk from your own code

The page reads the pasted Kotlin behind one feature in the browser for free — one or more files joined into one paste, each introduced by a // file: <path> line, plus build.gradle.kts (or a libs.versions.toml) for the Kotlin and kotlinx.coroutines versions — with its line numbers. It lexes strings, string templates, raw strings, char literals, backtick names and comments out first, rebuilds the brace structure (classes, funs, lambdas, loops, try/catch), matches every trailing lambda to its call, works out the scope and dispatcher of every line of coroutine code, and inventories every fun and whether it is suspend, every coroutine builder (launch, async, runBlocking, withContext, coroutineScope, flow, callbackFlow ...) with the scope and dispatcher it runs on, every call coroutine code makes that blocks its thread, every catch around suspending calls and whether it lets CancellationException through, every StateFlow, SharedFlow and Channel property and what is done to it, and every collect and whether code after it can run. Then it runs 17 deterministic checks drawn from coroutine practice (catalogue ids KC-01..KC-17, plus KC-18 for context): launch or async on GlobalScope or a throwaway CoroutineScope(...), runBlocking in coroutine code or on the main thread, Thread.sleep in coroutine code, blocking network, database and wait calls (OkHttp execute(), URL.readText(), JDBC, Future.get(), CountDownLatch.await(), BlockingQueue.take()) and blocking file I/O off Dispatchers.IO, catches and runCatching that swallow CancellationException, loops that never suspend or check for cancellation, async whose Deferred is never awaited, Job() or SupervisorJob() passed to a builder, callbackFlow without awaitClose, a MutableStateFlow holding a mutable collection or changed in place, value = value... instead of update { }, mutable flows exposed as public properties, code after collecting a flow that never completes, suspendCoroutine instead of suspendCancellableCoroutine, credential literals, and async { }.await() at once. Nothing is compiled or run: every flag is a reading of the text. Its two paid steps are available over HTTP. You send one JSON object with task set to "audit" or "fix", the paste as code and the page’s check as a facts string, and the model replies with one JSON object: an audit that rates the four areas, answers every flag and gives exact before/after edits per finding, or the whole fixed file(s) with a list of every change tied to the page’s flags.

Base URL: https://api.skillsafe.ai/v1/app-api. Every call sends Content-Type: application/json and, once you have a token, Authorization: Bearer <token>. The paths below (/guest, /me, /estimate, /run, /jobs/{job_id}, /run-stream) are relative to it, exactly as sdk.js calls them. A plain-text summary of the app for agents is at /llms.txt. Both lanes run on the gpt-terra model with a 10% publisher markup. A run needs a signed-in (user) token and is metered: the platform places a hold on your credits when the run starts and then charges only what the run used. /estimate is free.

The response envelope

Responses are JSON of the form {"ok": ..., "data": ..., "error": {...}}. The page’s SDK (sdk.js) decides success from the HTTP status, not from ok: on a 2xx it returns data; otherwise it raises an error whose message is error.message (or the HTTP status text when the body carries none), with status, code (error.code) and details (error.details) attached. A body that is not JSON is treated as {}.

{ "ok": true,  "data": { ... } }
{ "ok": false, "error": { "code": "...", "message": "...", "details": { ... } } }

Error codes

Branch on the HTTP status and error.code, show error.message. The page handles 401 and 402 by name; the rest reach it as a generic failure (“The run failed: ...”).

Failures that do not arrive as an HTTP status:

The task field: two lanes

task routes the run, and it takes exactly two values: "audit" and "fix". Each lane has its own reply contract, and a reply never mixes them. The skill’s instructions tell the model to do the audit lane when task is missing or anything else (and the page’s own Kotkit.buildInput turns any lane that is not "fix" into "audit"), so a typo silently gets you an audit: always send one of the two values.

The page chains the two: after an audit, “Apply every edit and fix the rest” puts every audit edit into the paste, switches to the fix lane on that edited paste and adds an audit_handoff string (below) with the audit’s verdict, headline and findings. Over the API that is a second run with task: "fix", the edited paste as code, facts recomputed from the edited paste, and that string. The page drops the handoff as soon as the paste is edited again.

Guards the page applies before a run and the API does not: it refuses to price or run a paste it cannot read as Kotlin (“Nothing was pasted.”, “No Kotlin file was found. Paste .kt source, with a // file: <path>.kt line above each file.”, or “This does not read as Kotlin source: no fun, class, object, import or package was found.”), and it warns before a run on a paste with no coroutine code (“No suspend fun and no coroutine was found: there may be little coroutine code here to audit.”, or “... to fix.”).

Input fields

This is exactly what the page sends (kotkit.js buildInput(lane, A, note, handoff), checked by mustBeObject; app.js currentInput and run), and what input-schema.json declares. The platform’s input schema is scalar-only, so every value is a string. buildInput emits them in the order task, code, facts, note, audit_handoff:

mustBeObject only insists on a plain object that is not wrapped in {"input": ...}; it is buildInput that leaves a blank note out, which is why an empty note is simply absent.

The code string

code is the paste itself. A line // file: <path> or # file: <path> (a path with a . or / in it) starts each file, and a --- line just before it only separates files. Files dropped on the page (or a dropped module folder) are joined that way by Kotkit.joinFiles: each file under its // file: line (# file: for a .toml file), trailing whitespace removed, joined by newlines, ending in a newline. A paste with no file line is read as one file, Main.kt (or build.gradle.kts when it reads as a build file). The page normalises line endings to \n. A .kt or .kts path is checked as Kotlin; build.gradle(.kts), settings.gradle(.kts) and a .versions.toml are gradle (the Kotlin plugin version, the kotlinx-coroutines-* artifacts and their version give facts.build); anything else is other. Kotlin indents with four spaces and the paste keeps them. Send the text you want the reply to quote: every file in an audit reply must be a path from facts.files, every line must fall inside that file, every evidence must be copied from it, and every edit’s before must occur in it exactly once.

The page reads up to 400 000 characters (MAX_TEXT, cut at a line) and 40 files (MAX_FILES), and sends at most 60 000 characters (MAX_SEND): past that buildInput drops whole files from the end — the last file that is neither Kotlin nor a Gradle file first, then the last file — until the rest fits, cuts a single remaining file at a line (“the end of <path>”) if it still does not, and ends the string with one line naming what it left out:

// [coroutine-desk: not sent: app/src/main/java/com/acme/B.kt, app/src/main/java/com/acme/C.kt]

The model is told never to quote or rewrite what was not sent, and facts.notes gets the sentence “Not sent (the paste is over 60,000 characters): ... The page checked them; the run did not see them.” facts is still computed from the whole paste. The worked examples below are small, so their code is the paste unchanged.

The facts string

facts is optional to compute but required to send. It is produced by the page’s free check: Kotkit.analyze splits the paste into files, lexes them, rebuilds their brace structure, works out the scope and dispatcher of the coroutine code, inventories it and runs the rules, and Kotkit.facts(A) turns that analysis into the object below (it does not depend on the lane: an audit and a fix run of the same paste carry the same facts). It is how the model knows which flags to answer, which file paths and line ranges to name, and which functions must survive. Its top-level keys, in the order built:

The simplest source is kotkit.js itself: the page loads it from /kotkit.js, and it also runs in Node (it sets module.exports). This script prints what the page would send as code and facts (with the 60 000-character cut applied), with the facts decoded so you can read them; the step 4 samples compact them back into the page’s string byte for byte. Save the paste as orders-paste.txt and redirect the output into orders-check.json:

// build-check.js -- run: node build-check.js orders-paste.txt > orders-check.json   (kotkit.js saved next to it)
const fs = require("fs");
const Kotkit = require("./kotkit.js");
const A = Kotkit.analyze(fs.readFileSync(process.argv[2], "utf8"));
if (!A.ok) { console.error(A.errors.join("\n")); process.exit(1); }
const inp = Kotkit.buildInput("audit", A, "", null);        // code and facts do not depend on the lane
console.log(JSON.stringify({ code: inp.code, facts: JSON.parse(inp.facts) }, null, 2));
const real = A.flags.filter((f) => f.sev !== "info");
console.error(A.files.filter((f) => f.kind === "kotlin").length + " Kotlin file(s), " + A.suspend_funs + " suspend fun(s) of " + A.functions.length + " fun(s), " + A.builders.length + " coroutine builder(s), " + A.flows.length + " flow propert(ies); " +
  real.length + " flags (" + A.counts.high + " high, " + A.counts.medium + " medium, " + A.counts.low + " low); verdict_candidate " + A.candidate);

For the orders example it reports 2 Kotlin file(s), 4 suspend fun(s) of 9 fun(s), 3 coroutine builder(s), 2 flow propert(ies); 6 flags (2 high, 3 medium, 1 low); verdict_candidate blocked; for the tracker example, 1 Kotlin file(s), 3 suspend fun(s) of 7 fun(s), 2 coroutine builder(s), 0 flow propert(ies); 3 flags (2 high, 1 medium, 0 low); verdict_candidate blocked. For both worked examples its code and facts are exactly what the page sends.

Without the page’s check. The platform only checks that facts is a string, so a minimal object works — "{}", or a hand-built one such as {"flags": [], "notes": ["No page check was run; read the code directly."]} — and the model still reads code. But you lose what the check adds: with no flags there is nothing to confirm, dismiss or close, with no files there are no paths and line ranges to name, with no build the model does not know the kotlinx.coroutines version or whether the code is Android, and with no functions nothing says what must survive a fix and stay suspend or not. Build it with kotkit.js as above when you can.

The audit_handoff string

Only for task: "fix", and only for the code the audit was about with every audit edit applied. The page builds both from the normalised audit reply res (recon.js normalize, below) and the analysis A of the audited paste, in recon.js fixHandoff:

const run = Recon.applyFindings(A, res.findings, Kotkit);   // every finding's edits, in order, each on top of the last
JSON.stringify({ verdict: res.verdict, headline: res.headline,
  findings: res.findings.map(f => ({ id: f.id, severity: f.severity, file: f.file, line: f.line, title: f.title, why: f.why, edits: f.edits.length })),
  applied: /* edits that applied */, failed: /* edits that did not */ })
// run.A.text is the edited paste: it becomes code, and facts is recomputed from it

That is {"verdict", "headline", "findings": [{id, severity, file, line, title, why, edits}], "applied", "failed"}, where each finding’s edits is the number of edits it carried. applyFindings applies every finding’s edits with Kotkit.applyEdits, in the order listed: each before must occur exactly once in its file as the earlier edits left it (leading and trailing blank lines ignored), or that edit is reported as failed and skipped — it is never guessed. The handoff is a previous reply, not evidence: the model checks it against code and fixes what is left. This script does the whole step — the edited paste, its recomputed facts and the handoff string, in the same shape as build-check.js prints, so the samples read it the same way:

// handoff.js -- run: node handoff.js orders-paste.txt orders-reply.txt > orders-fix-check.json   (kotkit.js, recon.js next to it)
const fs = require("fs");
const Kotkit = require("./kotkit.js");
const Recon = require("./recon.js");
const A = Kotkit.analyze(fs.readFileSync(process.argv[2], "utf8"));           // the audited paste
const res = Recon.normalize(Recon.parseResult(fs.readFileSync(process.argv[3], "utf8")), "audit");
const ho = Recon.fixHandoff(A, res);                                            // every edit, in order
const B = Kotkit.analyze(ho.text);                                              // facts recomputed from the edited paste
const inp = Kotkit.buildInput("fix", B, "", ho.handoff);
console.log(JSON.stringify({ code: inp.code, facts: JSON.parse(inp.facts), audit_handoff: inp.audit_handoff }, null, 2));
console.error(ho.applied + " edit(s) applied, " + ho.failed + " did not apply");

Save the audit’s output.output as orders-reply.txt; for the orders audit below it reports 14 edit(s) applied, 0 did not apply. The handoff string it builds, decoded, with each why left out:

{
  "verdict": "blocked",
  "headline": "Thread.sleep in the retry loop and runBlocking in authHeader can freeze the UI thread, and a cancellation-swallowing catch is why polling keeps hitting the API after the screen closes.",
  "findings": [
    {
      "id": "KC-03",
      "severity": "high",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 42,
      "title": "Thread.sleep blocks the retry loop in fetchOrders",
      "why": ...,
      "edits": 2
    },
    {
      "id": "KC-02",
      "severity": "high",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 105,
      "title": "runBlocking in authHeader blocks the calling thread",
      "why": ...,
      "edits": 3
    },
    {
      "id": "KC-04",
      "severity": "medium",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 37,
      "title": "OkHttp execute() runs uncontrolled on the caller's thread",
      "why": ...,
      "edits": 2
    },
    {
      "id": "KC-01",
      "severity": "medium",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 48,
      "title": "refreshInBackground launches on GlobalScope",
      "why": ...,
      "edits": 3
    },
    {
      "id": "KC-06",
      "severity": "medium",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 94,
      "title": "Polling's catch swallows CancellationException",
      "why": ...,
      "edits": 2
    },
    {
      "id": "KC-12",
      "severity": "low",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 95,
      "title": "Error state is set with a read-modify-write instead of update { }",
      "why": ...,
      "edits": 2
    }
  ],
  "applied": 14,
  "failed": 0
}

The page sends that fix run with the audit’s note and the key coroutine-desk:fix:f7f6c1dc-3319:a1; for the shipped example it first looks for a saved reply to replay under orders:fix, the handoff run of the orders audit.

The output contracts

The model is instructed (SKILL.md) to reply with one JSON object and nothing else — no prose, no code fences — with every array of its lane present ([] when empty). The run’s output text is that object. In both lanes it must ground everything in code: a caller, a DI module, a dispatcher, a scope’s owner, a lifecycle, a test or a library’s behaviour that is not in the paste is never claimed to exist — it goes into questions; whether a function from another file suspends, blocks or is thread safe is unknown unless the paste shows it (“if OrderDao.replaceAll is a Room suspend DAO ...”, never “it is”). It must never write a secret value: a line that holds a literal credential is never copied into the reply (not in evidence, not in an edit, not in a file), and no credential, real hostname or endpoint is invented. It must never change what the code offers its callers: the same public classes, funs and properties with the same names, parameters, return types and types, and the same suspend-or-not nature of every fun that is not private, unless the note asks for it. It uses an API only when it is sure the API exists with that name in kotlinx.coroutines (or AndroidX lifecycle, when the paste uses it), and never adds a dependency the paste does not already use unless the note allows it. Every page flag whose sev is not info is answered exactly once (audit lane: in flag_answers), and an info flag is never reported as a finding.

task: "audit"

• task: "audit".
• verdict: blocked (any finding is high) | needs_work (the worst is medium) | ready (nothing above low; low findings and questions do not stop a release).
• headline: one sentence. feature: one or two sentences — what the code does and what runs concurrently in it.
• areas[]: exactly four entries, in the order structure, threads, cancellation, flows: {area, status, note} with status sound | fragile | broken (broken when a high finding sits in that area, fragile for a medium one). structure: every coroutine has an owning scope that cancels it, parent-child links intact, async awaited, failures reach someone; threads: dispatchers, blocking calls, runBlocking, loops that never suspend; cancellation: CancellationException propagates, loops and callbacks can be cancelled, cleanup, awaitClose and invokeOnCancellation; flows: StateFlow and SharedFlow state held immutably, updated atomically and exposed read-only, collection that ends, flowOn and catch placement.
• findings[]: {id, flags[], file, line, severity, area, title, evidence, why, edits[]}. id is a catalogue id (KC-01..KC-17) or other; flags lists the page uids it confirms ([] for something the page did not flag); file is a path from facts.files, copied exactly; line is the line of code with the offending text, inside that file’s line..end_line; severity is high (the code freezes a thread, deadlocks, crashes or silently never runs: runBlocking in coroutine code or on the main thread, Thread.sleep in coroutine code, a loop in coroutine code that never suspends, a callbackFlow with no awaitClose, withContext around emit in a flow { }) | medium (work, errors, cancellation or state changes are lost: a blocking network, database or wait call off Dispatchers.IO, a catch that swallows CancellationException, GlobalScope or a throwaway scope, a root async nobody awaits, a Job passed to a builder, a MutableStateFlow of a mutable collection or changed in place, code after collecting a flow that never completes, a credential in the source) | low (bounded risk or hygiene: file I/O off Dispatchers.IO, value = value.copy(...) instead of update { }, a public mutable flow, suspendCoroutine, async { }.await() at once, an unawaited async inside coroutineScope); area is structure | threads | cancellation | flows; evidence is one to three whole lines copied verbatim from code as pasted (indentation may be trimmed).
• edits[]: {before, after} on that one file. Each before is a contiguous, exact slice of the file — whole lines with their indentation, as pasted — that occurs exactly once in the file as it stands when the edit is applied; after is its replacement, with the same indentation (four spaces, never tabs). Findings are applied in the order listed and their edits in order, each on top of the ones before, so a later finding that touches the same lines writes its before as the earlier one left it. A new import goes into the edit of the first finding that needs it, as an edit of an existing import line. Every line an edit adds follows the house rules itself, so the page’s re-check raises nothing new. An edit keeps a suspend fun suspend and a plain fun plain — except a private fun, which may become suspend when the same finding changes every caller of it — and never changes a public signature. edits may be [] only for a low finding or a change outside the paste.
• flag_answers[]: {flag, status, reason}, exactly one per non-info page flag, status confirmed (a finding lists that uid) | dismissed (with the reason).
• plan[]: the findings in the order to apply them, ending with a test under runTest (kotlinx-coroutines-test) that would have caught the worst problem and a cancellation test that cancels the scope or job and asserts the work stops. questions[] (only what the paste cannot answer) and summary (two to four sentences, answering note if one was sent).

task: "fix"

• task: "fix".
• verdict: fixed (open is empty) | partial.
• headline: one sentence.
• files[]: {path, content} — every pasted file it changes, whole (every line, without the // file: line, indented as the file already is: four spaces per level, never tabs), under its path from facts.files. At most one new file next to them. Only the standard library, kotlinx.coroutines and what the paste already depends on.
• changes[]: {file, function, flags[], change, why}, one per change. function is the fun it is in, as facts.functions names it (Class.fun), or (module) for a change outside any fun (an import, a property, a class header) or (gradle) for the build file; flags are the page flags the change closes. Every high and medium flag appears in the flags of a change or of an open item.
• verify[]: always the build (./gradlew build, or the module’s test task), plus the test that would have caught the worst problem (a runTest test with virtual time — advanceTimeBy, advanceUntilIdle — one that cancels the job and asserts the loop or the retry stops, one that collects the StateFlow and asserts the new value arrives, or one that closes the collector of a callbackFlow and asserts the listener is unregistered).
• open[]: {item, flags[], reason} for what it left unfixed — a decision for the engineer, or code outside the paste. questions[] and summary, as in the audit lane; with an audit_handoff, it fixes what the audit left.

How the page reads a reply (recon.js parseResult and normalize): it strips a code fence and parses from the first { to the last }. A reply is read as the lane that was asked for, unless it names the other lane and carries that lane’s body (a files array for fix, a findings array for audit). An unknown verdict shows as needs_work or partial and counts as a disagreement; an unknown severity becomes medium; ids like KC7 or kc 7 become KC-07; flags keeps only F<n> values; findings with no file, evidence and title are dropped; feature may also arrive as service or system, file as path, a change’s function as func and its change as what, and an open item as path; questions is capped at 10, plan at 30 and verify at 20. An audit reply carries 9 sections (verdict, headline, feature, areas, findings, flag_answers, plan, questions, summary) and a fix reply 8 (verdict, headline, files, changes, verify, open, questions, summary), which is what the page counts when it recovers a partial reply.

Worked examples

Both are examples the page ships (the example buttons on the app page; the full pastes are in /example.js, ids orders and tracker), built exactly as the page builds them: Kotkit.buildInput(lane, Kotkit.analyze(text), note, null), with the real model reply the page replays for each (/example-result.js). The pastes are shown whole; the request bodies cut the long code and facts strings with a visible ..., and the replies are pretty-printed excerpts, with ... where entries were left out. Every value shown is copied from the input or the reply. Neither paste holds a credential: the orders token comes from a TokenStore at run time, and the companies are invented.

Audit: an order sync that sleeps and calls OkHttp’s blocking execute() in a suspend fun, runs runBlocking on the main thread, launches on GlobalScope and swallows cancellation in its polling loop

Three files: build.gradle.kts (the Android application plugin, Kotlin 2.0.21, kotlinx-coroutines-android:1.8.1, lifecycle-viewmodel-ktx:2.8.6 and okhttp:4.12.0), OrderRepository.kt and OrderSyncViewModel.kt: an Android order sync. OrderRepository.fetchOrders is a suspend fun with no withContext of its own: a while (true) retry loop that calls OkHttp’s blocking client.newCall(request).execute(), catches IOException and waits with Thread.sleep(500L * attempt); refreshInBackground starts GlobalScope.launch to fetch and dao.replaceAll(orders). OrderSyncViewModel.startPolling launches a while (true) loop in viewModelScope that fetches, publishes a new SyncState and delay(30_000)s, inside a catch (e: Exception) that writes the error with _state.value = _state.value.copy(...); refreshNow calls refreshInBackground(authHeader()), and the private authHeader is runBlocking { "Bearer " + tokens.currentToken() }. The page’s free check raises 6 flags (2 high, 3 medium, 1 low) plus the KC-18 context flag; its own reading of the verdict is blocked. The engineer’s note: “Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.”

The code string, whole: 3,284 characters, 112 lines ending in a newline. Save it as orders-paste.txt and run node build-check.js orders-paste.txt > orders-check.json:

// file: build.gradle.kts
plugins {
    id("com.android.application")
    kotlin("android") version "2.0.21"
}

dependencies {
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.1")
    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.6")
    implementation("com.squareup.okhttp3:okhttp:4.12.0")
}
---
// file: app/src/main/java/com/example/orders/OrderRepository.kt
package com.example.orders

import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import okhttp3.OkHttpClient
import okhttp3.Request
import java.io.IOException

data class Order(val id: String, val status: String)

class OrderRepository(
    private val client: OkHttpClient,
    private val baseUrl: String,
    private val dao: OrderDao,
) {
    suspend fun fetchOrders(auth: String): List<Order> {
        var attempt = 0
        while (true) {
            try {
                val request = Request.Builder()
                    .url("$baseUrl/v2/orders")
                    .header("Authorization", auth)
                    .build()
                val body = client.newCall(request).execute().use { it.body!!.string() }
                return parseOrders(body)
            } catch (e: IOException) {
                attempt++
                if (attempt >= 3) throw e
                Thread.sleep(500L * attempt)
            }
        }
    }

    fun refreshInBackground(auth: String) {
        GlobalScope.launch {
            val orders = fetchOrders(auth)
            dao.replaceAll(orders)
        }
    }

    private fun parseOrders(body: String): List<Order> =
        body.lines().filter { it.isNotBlank() }.map { line ->
            val (id, status) = line.split(",")
            Order(id, status)
        }
}

interface OrderDao {
    suspend fun replaceAll(orders: List<Order>)
    suspend fun count(): Int
}
---
// file: app/src/main/java/com/example/orders/OrderSyncViewModel.kt
package com.example.orders

import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch
import kotlinx.coroutines.runBlocking

data class SyncState(val orders: List<Order> = emptyList(), val error: String? = null)

class OrderSyncViewModel(
    private val repository: OrderRepository,
    private val tokens: TokenStore,
) : ViewModel() {
    private val _state = MutableStateFlow(SyncState())
    val state: StateFlow<SyncState> = _state.asStateFlow()

    fun startPolling() {
        viewModelScope.launch {
            while (true) {
                try {
                    val orders = repository.fetchOrders(authHeader())
                    _state.value = SyncState(orders = orders)
                    delay(30_000)
                } catch (e: Exception) {
                    _state.value = _state.value.copy(error = e.message)
                }
            }
        }
    }

    fun refreshNow() {
        repository.refreshInBackground(authHeader())
    }

    private fun authHeader(): String = runBlocking {
        "Bearer " + tokens.currentToken()
    }
}

interface TokenStore {
    suspend fun currentToken(): String
}

Its facts, decoded (the request carries this object as one compact JSON string):

{
  "build": {
    "kotlin": "2.0.21",
    "coroutines": "1.8.1",
    "coroutines_artifacts": [
      "android"
    ],
    "gradle_pasted": true,
    "android": true,
    "kotlin_files": 2,
    "functions": 9,
    "suspend_funs": 4,
    "builders": 3,
    "flows": 2
  },
  "files": [
    {
      "path": "build.gradle.kts",
      "kind": "gradle",
      "line": 2,
      "end_line": 11
    },
    {
      "path": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "kind": "kotlin",
      "line": 14,
      "end_line": 64
    },
    {
      "path": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "kind": "kotlin",
      "line": 67,
      "end_line": 113
    }
  ],
  "functions": [
    {
      "name": "OrderRepository.fetchOrders",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 29,
      "suspend": true,
      "private": false
    },
    {
      "name": "OrderRepository.refreshInBackground",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 47,
      "suspend": false,
      "private": false
    },
    {
      "name": "OrderRepository.parseOrders",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 54,
      "suspend": false,
      "private": true
    },
    {
      "name": "OrderDao.replaceAll",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 62,
      "suspend": true,
      "private": false
    },
    {
      "name": "OrderDao.count",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 63,
      "suspend": true,
      "private": false
    },
    {
      "name": "OrderSyncViewModel.startPolling",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 87,
      "suspend": false,
      "private": false
    },
    {
      "name": "OrderSyncViewModel.refreshNow",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 101,
      "suspend": false,
      "private": false
    },
    {
      "name": "OrderSyncViewModel.authHeader",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 105,
      "suspend": false,
      "private": true
    },
    {
      "name": "TokenStore.currentToken",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 111,
      "suspend": true,
      "private": false
    }
  ],
  "coroutines": [
    {
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 48,
      "func": "OrderRepository.refreshInBackground",
      "builder": "launch",
      "scope": "GlobalScope",
      "dispatcher": "default",
      "in_loop": false,
      "kept": null
    },
    {
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 88,
      "func": "OrderSyncViewModel.startPolling",
      "builder": "launch",
      "scope": "viewModelScope",
      "dispatcher": "main",
      "in_loop": false,
      "kept": null
    },
    {
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 105,
      "func": "OrderSyncViewModel.authHeader",
      "builder": "runBlocking",
      "scope": null,
      "dispatcher": null,
      "in_loop": false,
      "kept": null
    }
  ],
  "blocking_calls": [
    {
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 37,
      "func": "OrderRepository.fetchOrders",
      "call": "client.newCall(request).execute",
      "id": "KC-04",
      "dispatcher": "caller"
    },
    {
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 42,
      "func": "OrderRepository.fetchOrders",
      "call": "Thread.sleep",
      "id": "KC-03",
      "dispatcher": "caller"
    }
  ],
  "catches": [
    {
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 94,
      "func": "OrderSyncViewModel.startPolling",
      "type": "Exception",
      "suspends": [
        "fetchOrders",
        "delay"
      ],
      "rethrows": false,
      "in_loop": true
    }
  ],
  "state_flows": [
    {
      "name": "_state",
      "kind": "MutableStateFlow",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 84,
      "visibility": "private",
      "holds_mutable": false,
      "changed_in_place": 0,
      "read_modify_write": 1
    },
    {
      "name": "state",
      "kind": "StateFlow",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 85,
      "visibility": "public",
      "holds_mutable": false,
      "changed_in_place": 0,
      "read_modify_write": 0
    }
  ],
  "collects": [],
  "flags": [
    {
      "uid": "F1",
      "id": "KC-03",
      "sev": "high",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 42,
      "text": "suspend fun OrderRepository.fetchOrders calls Thread.sleep(): Thread.sleep parks the thread and ignores cancellation",
      "detail": "Thread.sleep blocks the thread the coroutine runs on - on the main dispatcher the UI freezes (an ANR after five seconds), on Dispatchers.Default or IO one of a small pool of threads stops serving every other coroutine - and it cannot be cancelled, so a cancelled scope still waits it out. delay(ms) suspends instead: the thread is free while it waits and cancellation ends the wait at once."
    },
    {
      "uid": "F2",
      "id": "KC-02",
      "sev": "high",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 105,
      "text": "runBlocking is called on the main thread in OrderSyncViewModel.authHeader (OrderSyncViewModel)",
      "detail": "Every method of a ViewModel, an Activity, a Fragment or a composable is called on the main thread: runBlocking stops that thread until the block finishes - the UI freezes, a slow network turns into an ANR, and a block that needs Dispatchers.Main to resume never does, which deadlocks. Launch it in viewModelScope or lifecycleScope and publish the result through state instead."
    },
    {
      "uid": "F3",
      "id": "KC-04",
      "sev": "medium",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 37,
      "text": "suspend fun OrderRepository.fetchOrders calls client.newCall(request).execute() on whatever dispatcher calls it - on Android usually the main thread: a blocking network, database or wait call runs on a coroutine's thread",
      "detail": "Blocking calls (OkHttp Call.execute(), URL.readText(), JDBC executeQuery, Future.get(), CountDownLatch.await(), BlockingQueue.take()) hold the thread until they return. Coroutine code that is not inside withContext(Dispatchers.IO) runs on whatever dispatcher the caller uses - on Android usually the main thread, which throws NetworkOnMainThreadException or freezes the UI - and nothing suspends, so cancellation cannot interrupt it. Wrap the call in withContext(Dispatchers.IO) { ... } (the suspend fun is then main-safe), or use a suspending API (OkHttp's await via an adapter, a suspending Retrofit fun, CompletableFuture.await() from kotlinx-coroutines-jdk8)."
    },
    {
      "uid": "F4",
      "id": "KC-01",
      "sev": "medium",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 48,
      "text": "GlobalScope.launch in OrderRepository.refreshInBackground starts a coroutine that nothing owns",
      "detail": "A GlobalScope coroutine lives as long as the process: closing the screen, stopping the service or a failing caller never cancels it, so it keeps working (and holding whatever it captured - a ViewModel, an Activity) after nobody wants the result, and a crash in it is reported nowhere near the code that started it. Launch it in the scope that owns the work - viewModelScope, lifecycleScope, an injected application scope - or make the function suspend and let the caller decide."
    },
    {
      "uid": "F5",
      "id": "KC-06",
      "sev": "medium",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 94,
      "text": "catch (e: Exception) in OrderSyncViewModel.startPolling wraps fetchOrders() and delay(), and also catches CancellationException, so the loop around it keeps running after the coroutine is cancelled",
      "detail": "Cancellation reaches a suspended coroutine as a CancellationException thrown from the suspension point. Exception includes it, and this catch neither rethrows it nor checks for it: the coroutine logs or retries and goes on as if nothing happened - after the screen closed, after withTimeout gave up, after a sibling failed - and structured concurrency waits for it. Rethrow it first (catch (e: CancellationException) { throw e } before this catch, or if (e is CancellationException) throw e), or call coroutineContext.ensureActive() in the catch."
    },
    {
      "uid": "F6",
      "id": "KC-12",
      "sev": "low",
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 95,
      "text": "_state.value is read, changed and written back in 1 place instead of _state.update { }",
      "detail": "value = value.copy(...) reads and writes in two steps: when two coroutines (or a coroutine and the main thread) do it at the same time, one of the two changes is lost. update { it.copy(...) } (kotlinx.coroutines.flow.update) retries with compare-and-set until the change lands on the latest value."
    },
    {
      "uid": "F7",
      "id": "KC-18",
      "sev": "info",
      "file": "app/src/main/java/com/example/orders/OrderRepository.kt",
      "line": 14,
      "text": "context: 2 Kotlin files, 4 suspend fun(s) of 9 fun(s), 3 coroutine builder(s) (2 launch, 0 async), 2 flow or channel properties, kotlinx.coroutines 1.8.1 [android]",
      "detail": "Also read: build.gradle.kts (gradle). Only what is pasted is checked: which dispatcher a caller outside the paste uses, whether a function from another file suspends or blocks, and how the scopes are cancelled outside the paste, is outside the check."
    }
  ],
  "verdict_candidate": "blocked",
  "notes": []
}

The request body (POST /estimate, then POST /run or /run-stream with Idempotency-Key: coroutine-desk:audit:b94f0c30-320c:a1 as the page sends it):

{
  "task": "audit",
  "code": "// file: build.gradle.kts\nplugins {\n    id(\"com.android.application\")\n    kotlin(\"android\") version \"2.0.21\"\n}\n\ndependencies {\n    implementation(\"org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.1\")\n    implementation(\"androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.6\")\n    implementation(\"com.squareup.okhttp3:okhttp:4.12.0\")\n}\n---\n// file: app/src/main/java/com/example/orders/OrderRepository.kt\npackage com.example.orders\n...",
  "facts": "{\"build\":{\"kotlin\":\"2.0.21\",\"coroutines\":\"1.8.1\",\"coroutines_artifacts\":[\"android\"],\"gradle_pasted\":true,\"android\":true,\"kotlin_files\":2,\"functions\":9,\"suspend_funs\":4,\"builders\":3,\"flows\":2},\"files\":...",
  "note": "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller."
}

The reply (output.output), an excerpt: the verdict, the headline, the feature, each area’s status, and the finding that answers “polling keeps hitting the orders API after the screen is closed”, with its edits and its flag answer:

{
  "task": "audit",
  "verdict": "blocked",
  "headline": "Thread.sleep in the retry loop and runBlocking in authHeader can freeze the UI thread, and a cancellation-swallowing catch is why polling keeps hitting the API after the screen closes.",
  "feature": "OrderRepository fetches orders from a REST endpoint over OkHttp (retrying IOException up to three times) and can push a fire-and-forget refresh into a DAO; OrderSyncViewModel polls fetchOrders every 30 seconds inside viewModelScope, publishing the result through a StateFlow, and fetches a bearer token synchronously before each call.",
  "areas": [
    {
      "area": "structure",
      "status": "fragile"
    },
    {
      "area": "threads",
      "status": "broken"
    },
    {
      "area": "cancellation",
      "status": "fragile"
    },
    {
      "area": "flows",
      "status": "sound"
    }
  ],
  "findings": [
    ...,
    {
      "id": "KC-06",
      "flags": [
        "F5"
      ],
      "file": "app/src/main/java/com/example/orders/OrderSyncViewModel.kt",
      "line": 94,
      "severity": "medium",
      "area": "cancellation",
      "title": "Polling's catch swallows CancellationException",
      "evidence": "} catch (e: Exception) {\n_state.value = _state.value.copy(error = e.message)",
      "why": "This catch wraps repository.fetchOrders(authHeader()) and delay(30_000) and neither rethrows CancellationException nor checks isActive/ensureActive. When viewModelScope is cancelled (the ViewModel is cleared, e.g. the screen closes) the CancellationException thrown at that suspension point is caught here, _state is written, and the surrounding while(true) loop immediately calls fetchOrders() again - so the poller keeps hitting the orders API after the screen that started it is gone.",
      "edits": [
        {
          "before": "import androidx.lifecycle.viewModelScope\nimport kotlinx.coroutines.delay",
          "after": "import androidx.lifecycle.viewModelScope\nimport kotlinx.coroutines.CancellationException\nimport kotlinx.coroutines.delay"
        },
        {
          "before": "                } catch (e: Exception) {\n                    _state.value = _state.value.copy(error = e.message)\n                }",
          "after": "                } catch (e: CancellationException) {\n                    throw e\n                } catch (e: Exception) {\n                    _state.value = _state.value.copy(error = e.message)\n                }"
        }
      ]
    },
    ...
  ],
  "flag_answers": [
    ...,
    {
      "flag": "F5",
      "status": "confirmed",
      "reason": "catch (e: Exception) in startPolling neither rethrows CancellationException nor checks isActive, so cancellation is swallowed."
    },
    ...
  ],
  "plan": [
    ...,
    "Add a kotlinx-coroutines-test runTest that starts polling, advances virtual time past 30_000ms to confirm a second fetch happens, then cancels the job and asserts fetchOrders is not called again - this would have caught F5 letting the loop survive cancellation - plus a test that makes fetchOrders throw and asserts state.value.error is set."
  ],
  "questions": [
    ...
  ],
  "summary": ...
}

The reply has 6 findings, one per flag, and confirms all 6 flags; they carry 14 edits in all. In order: Thread.sleep(500L * attempt) becomes delay(500L * attempt), with the delay import (F1, KC-03); authHeader becomes a private suspend fun without runBlocking, and refreshNow calls it from viewModelScope.launch { } (F2, KC-02); the OkHttp call moves into withContext(Dispatchers.IO) { } (F3, KC-04); OrderRepository gets a private val externalScope: CoroutineScope constructor parameter, which the note allows, and refreshInBackground launches on it instead of GlobalScope (F4, KC-01); the finding above rethrows CancellationException before the general catch (F5, KC-06); and the error branch uses _state.update { it.copy(error = e.message) } (F6, KC-12). Every finding writes its import edit on top of the import lines the earlier findings left, which is why all 14 apply in order and the re-check below raises nothing.

Fix: a route recorder whose callbackFlow has no awaitClose and whose finish() spins on a volatile flag, with a launch(SupervisorJob()) left in place on purpose

One file, RouteRecorder.kt, and no build file. RouteRecorder.fixes is a callbackFlow { } that registers a LocationSource listener sending each fix with trySendBlocking(fix) and then ends without awaitClose, so the flow fails as soon as it is collected and the listener is never unregistered; record calls scope.launch(SupervisorJob()) to collect it and sets a @Volatile uploading flag around store.append(trackId, fix); and the suspend fun finish waits with an empty while (uploading) { } loop before store.close(trackId). The free check raises 3 flags (2 high, 1 medium, 0 low); its reading of the verdict is blocked. This example has no audit before it, so it carries no audit_handoff. The engineer’s note: “Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.”

The code string, whole: 1,381 characters, 51 lines ending in a newline. Save it as tracker-paste.txt and run node build-check.js tracker-paste.txt > tracker-check.json:

// file: app/src/main/java/com/example/tracks/RouteRecorder.kt
package com.example.tracks

import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.SupervisorJob
import kotlinx.coroutines.channels.trySendBlocking
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.callbackFlow
import kotlinx.coroutines.launch

data class Fix(val lat: Double, val lon: Double, val accuracyM: Float)

interface LocationSource {
    fun register(listener: (Fix) -> Unit): Int
    fun unregister(handle: Int)
}

interface TrackStore {
    suspend fun append(trackId: String, fix: Fix)
    suspend fun close(trackId: String)
}

class RouteRecorder(
    private val source: LocationSource,
    private val store: TrackStore,
    private val scope: CoroutineScope,
) {
    @Volatile private var uploading = false

    fun fixes(): Flow<Fix> = callbackFlow {
        val handle = source.register { fix -> trySendBlocking(fix) }
    }

    fun record(trackId: String) {
        scope.launch(SupervisorJob()) {
            fixes().collect { fix ->
                if (fix.accuracyM < 50f) {
                    uploading = true
                    store.append(trackId, fix)
                    uploading = false
                }
            }
        }
    }

    suspend fun finish(trackId: String) {
        while (uploading) {
        }
        store.close(trackId)
    }
}

Its facts, decoded, cut to files, flags and verdict_candidate (the full object also carries the build block — no build file pasted, so kotlin and coroutines are null — the 7 functions, 3 of them suspend, the 2 coroutine builders (callbackFlow in RouteRecorder.fixes and scope.launch in RouteRecorder.record), the one collect of fixes(), which is not hot, and empty blocking_calls, catches and state_flows):

{
  "files": [
    {
      "path": "app/src/main/java/com/example/tracks/RouteRecorder.kt",
      "kind": "kotlin",
      "line": 2,
      "end_line": 52
    }
  ],
  "flags": [
    {
      "uid": "F1",
      "id": "KC-10",
      "sev": "high",
      "file": "app/src/main/java/com/example/tracks/RouteRecorder.kt",
      "line": 30,
      "text": "callbackFlow { } in RouteRecorder.fixes never calls awaitClose",
      "detail": "A callbackFlow's block must end in awaitClose { unregister(...) }: without it the block returns right after registering the listener, the flow fails with IllegalStateException (\"'awaitClose { yourCallbackOrListener.cancel() }' should be used in the end of callbackFlow block\"), and the listener is never removed - it keeps calling trySend on a closed channel and leaks whatever it captured. End the block with awaitClose { ... } that unregisters the callback."
    },
    {
      "uid": "F2",
      "id": "KC-07",
      "sev": "high",
      "file": "app/src/main/java/com/example/tracks/RouteRecorder.kt",
      "line": 47,
      "text": "while (uploading) in RouteRecorder.finish spins without suspending or checking for cancellation",
      "detail": "The loop waits for a condition by spinning: it never suspends, so it burns its thread at 100% until the condition changes - and if the code that would change it needs the same thread (the main dispatcher, a single-thread context), it never does. Cancelling the scope does not stop it either. Wait with a suspending primitive (a StateFlow's first { it }, a Channel, a CompletableDeferred, delay between checks) and check ensureActive()."
    },
    {
      "uid": "F3",
      "id": "KC-09",
      "sev": "medium",
      "file": "app/src/main/java/com/example/tracks/RouteRecorder.kt",
      "line": 35,
      "text": "launch(SupervisorJob()) in RouteRecorder.record cuts the coroutine off from its parent",
      "detail": "A Job passed to a builder replaces the parent's job in the new coroutine's context, so the new coroutine is no longer a child of the scope it was launched from: cancelling that scope (viewModelScope when the screen closes, a coroutineScope when a sibling fails) does not cancel it, and its failure does not reach the parent. For supervision, use supervisorScope { } or a scope built as CoroutineScope(SupervisorJob() + dispatcher); to stop cancellation of cleanup, use withContext(NonCancellable)."
    },
    {
      "uid": "F4",
      "id": "KC-18",
      "sev": "info",
      "file": "app/src/main/java/com/example/tracks/RouteRecorder.kt",
      "line": 2,
      "text": "context: 1 Kotlin file, 3 suspend fun(s) of 7 fun(s), 2 coroutine builder(s) (1 launch, 0 async), 0 flow or channel properties, no build file pasted",
      "detail": "Only what is pasted is checked: which dispatcher a caller outside the paste uses, whether a function from another file suspends or blocks, and how the scopes are cancelled outside the paste, is outside the check."
    }
  ],
  "verdict_candidate": "blocked"
}

The request body (Idempotency-Key: coroutine-desk:fix:e99d934e-1968:a1):

{
  "task": "fix",
  "code": "// file: app/src/main/java/com/example/tracks/RouteRecorder.kt\npackage com.example.tracks\n\nimport kotlinx.coroutines.CoroutineScope\nimport kotlinx.coroutines.SupervisorJob\nimport kotlinx.coroutines.channels.trySendBlocking\nimport kotlinx.coroutines.flow.Flow\nimport kotlinx.coroutines.flow.callbackFlow\nimport kotlinx.coroutines.launch\n...",
  "facts": "{\"build\":{\"kotlin\":null,\"coroutines\":null,\"coroutines_artifacts\":[],\"gradle_pasted\":false,\"android\":false,\"kotlin_files\":1,\"functions\":7,\"suspend_funs\":3,\"builders\":2,\"flows\":0},\"files\":[{\"path\":\"app/...",
  "note": "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint."
}

The reply (output.output), an excerpt: the verdict, the headline, the returned file from the new Mutex on, the change that stops the spin, the last verification step and the open item:

{
  "task": "fix",
  "verdict": "partial",
  "headline": "Added awaitClose to fixes() and replaced the busy-spin in finish() with a Mutex wait; left launch(SupervisorJob()) in record() exactly as the note asked.",
  "files": [
    {
      "path": "app/src/main/java/com/example/tracks/RouteRecorder.kt",
      "content": "package com.example.tracks\n...\n    private val uploadLock = Mutex()\n\n    fun fixes(): Flow<Fix> = callbackFlow {\n        val handle = source.register { fix -> trySendBlocking(fix) }\n        awaitClose { source.unregister(handle) }\n    }\n\n    fun record(trackId: String) {\n        scope.launch(SupervisorJob()) {\n            fixes().collect { fix ->\n                if (fix.accuracyM < 50f) {\n                    uploadLock.withLock {\n                        store.append(trackId, fix)\n                    }\n                }\n            }\n        }\n    }\n\n    suspend fun finish(trackId: String) {\n        uploadLock.withLock { }\n        store.close(trackId)\n    }\n}\n"
    }
  ],
  "changes": [
    ...,
    {
      "file": "app/src/main/java/com/example/tracks/RouteRecorder.kt",
      "function": "RouteRecorder.finish",
      "flags": [
        "F2"
      ],
      "change": "Replaced while (uploading) { } with uploadLock.withLock { } before store.close(trackId).",
      "why": "Suspends at a real cancellation point until any in-flight append releases the lock, instead of spinning the thread at 100% and never suspending or reacting to cancellation."
    }
  ],
  "verify": [
    ...,
    "A runTest with a fake TrackStore.append that suspends on a CompletableDeferred until released: call record(trackId), then launch finish(trackId) while append is still suspended, advanceUntilIdle(), and assert store.close is only reached after the deferred completes and append returns - this would have caught the busy-spin (F2), which otherwise burns real CPU instead of suspending."
  ],
  "open": [
    {
      "item": "launch(SupervisorJob()) in RouteRecorder.record still replaces the parent job, so cancelling scope does not cancel the recording coroutine and a failure inside it never reaches scope's owner.",
      "flags": [
        "F3"
      ],
      "reason": "The note asks to leave this exactly as it is for now, since the platform team is moving the recorder onto its own supervised scope next sprint."
    }
  ],
  "questions": [
    ...
  ],
  "summary": ...
}

The other three changes add the awaitClose, Mutex and withLock imports ((module), no flag), end the callbackFlow with awaitClose { source.unregister(handle) } (F1), and replace the @Volatile flag in RouteRecorder.record with a private Mutex held around store.append (no flag of its own; it is what finish now waits on). The verdict is partial because the note asked to leave launch(SupervisorJob()) as it is, so the medium F3 is named in open rather than fixed; every fun keeps its name and its suspend or not.

The page checks the reply against the code; the API does not

What comes back from the API is the model’s raw text in output.output. The page holds it to account in the browser before showing it (recon.js reconcile, with the facts, the code and the handoff it sent): it applies every edit or returned file to the paste and re-runs its own checks on the result. None of that happens in the API. A direct API caller gets the reply unchecked and must do the applying and re-checking itself.

• Both lanes: the reply is the lane you asked for (one written for the other task is a disagreement), it carries a valid verdict for that lane, and no credential from the paste is repeated anywhere in it (every credential value the free check found in the paste).
• Audit: the areas table. Exactly four rows, covering structure, threads, cancellation and flows once each, each with a valid status.
• Audit: every finding is anchored. Its id is in the catalogue (KC-01..KC-17, or other; KC-18 is context and never a finding); its file is a pasted file; its line is inside that file; its evidence is found line by line in that file of code (indentation trimmed) and on or within three lines of line; every cited uid is a non-info flag the page raised. A finding that carries a high flag at a lower severity, or a medium or high finding with no edit, is pointed out.
• Audit: every flag is answered once, consistently. Every non-info flag answered exactly once and no other; a confirmed answer needs a finding carrying that uid; a dismissed one must not be carried by a finding and should give a reason. The verdict must fit the worst severity (blocked with a high finding, needs_work with a medium, otherwise ready).
• Audit: every edit is put in place and re-checked. The findings’ edits are applied in the listed order, each on top of the ones before (Kotkit.applyEdits): a before that is not found, is found more than once, or changes nothing is a disagreement. After each finding the free check runs again: the code must still read and no new high flag may appear. With every edit applied, every confirmed flag a finding with edits carries must be gone, every function of the paste must still exist, and a new medium flag is pointed out.
• Fix: the files. At least one file, at most one new one; none empty, none with a // file: (or # file:) line, every path a .kt or .kts file or a .versions.toml; a Kotlin file indented with tabs is pointed out, and one sent back with every line indented is a disagreement.
• Fix: put into the paste and re-checked. The files replace the pasted files of the same path (or are added) (Kotkit.replaceFiles) and the free check runs again: the code must read, no high or medium flag of the paste may remain unless an open item names it, no new high or medium flag may appear, every function must still exist, and every fun that is not private must keep its fun or suspend fun.
• Fix: the changes list matches the code. Every change names a returned file, a function in the fixed code (or (module), (gradle) or (top level)) and real page flags; a high or medium flag no change and no open item names is pointed out. The verdict must fit the open list, and an empty verify, or one with no test in it, is pointed out.

recon.js also runs in Node, so you can hold a reply to exactly the page’s standard. Save /kotkit.js and /recon.js next to this script, pass the file you built the body from (build-check.js or handoff.js output), the reply text and the lane; it prints every statement, the count, and the paste with every edit (or file) put back:

// recheck.js -- run: node recheck.js orders-check.json orders-reply.txt audit > orders-edited.txt   (kotkit.js, recon.js next to it)
const fs = require("fs");
const Recon = require("./recon.js");                                            // loads ./kotkit.js itself
const sent = JSON.parse(fs.readFileSync(process.argv[2], "utf8"));             // code, facts (and audit_handoff) you sent
const lane = process.argv[4] || "audit";
const res = Recon.normalize(Recon.parseResult(fs.readFileSync(process.argv[3], "utf8")), lane);  // output.output
const r = Recon.reconcile(res, { facts: sent.facts, code: sent.code, handoff: sent.audit_handoff || null });
r.notes.forEach((n) => console.error(n.kind + ": " + n.text));
console.error(r.disagreements + " disagreement(s) in " + r.statements + " statements checked");
if (r.after) (r.after.flags || []).forEach((f) => console.error("still raised: " + f.id + " " + f.sev + " " + f.file + ":" + f.line + " " + f.text));
if (r.after && r.after.text) console.log(r.after.text.replace(/\n$/, ""));      // the paste with every edit (or file) put back

For the orders audit reply it reports:

ok: The areas table rates structure, threads, cancellation and flows once each.
ok: Every one of the 6 findings names a pasted file, a line inside it and evidence copied from it.
ok: The verdict (blocked) fits the worst finding.
ok: Every one of the page's 6 flags is answered once.
ok: All 14 edits applied in order, each before text found exactly once.
ok: Every confirmed flag a finding carries is gone once all edits are applied.
ok: Every function of the paste is still there after the edits.
ok: The reply repeats no credential from the paste.
0 disagreement(s) in 8 statements checked

and for the tracker fix reply (node recheck.js tracker-check.json tracker-reply.txt fix):

ok: 1 file returned whole.
ok: With the fixed files in place the free check raises no high or medium flag beyond the ones left open (0 low).
info: F3 left open by the reply.
ok: Every one of the 7 functions is still there.
ok: Every one of the 4 changes names a returned file, a function in the fixed code and real page flags.
ok: The verdict (partial) fits the open list.
ok: The reply repeats no credential from the paste.
0 disagreement(s) in 6 statements checked
still raised: KC-09 medium app/src/main/java/com/example/tracks/RouteRecorder.kt:39 launch(SupervisorJob()) in RouteRecorder.record cuts the coroutine off from its parent

The page does not compile or run the code. After that, build it (./gradlew build, or the module’s test task), run the tests the reply’s plan or verify names under runTest (kotlinx-coroutines-test) with virtual time and a cancellation test that cancels the scope and asserts the work stops, and on Android watch a run with a profiler and StrictMode on for work that blocks the main thread, before you ship anything.

Step 1 — a tiny client helper

One function per language that does what sdk.js does for every call: JSON in, bearer token if you have one, data out on a 2xx, an error carrying status, error.code and error.message otherwise. The later steps assume this helper is in the same file (for Go, Java and C#, the later snippets go inside main / the top-level statements; Java’s makeInput from step 4 goes in the class).

BASE="https://api.skillsafe.ai/v1/app-api"
TOKEN="${SKILLSAFE_TOKEN:-YOUR_TOKEN}"   # step 2

# api METHOD PATH [extra curl args...] -- prints the whole envelope; pipe to jq
api() {
  method="$1"; path="$2"; shift 2
  curl -sS -X "$method" "$BASE$path" \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $TOKEN" "$@"
}
# success: jq '.data'      failure: jq '.error | {code, message}'

import hashlib, json, os, time, urllib.parse
import requests  # pip install requests

BASE = "https://api.skillsafe.ai/v1/app-api"
TOKEN = os.environ.get("SKILLSAFE_TOKEN", "YOUR_TOKEN")  # step 2


class ApiError(Exception):
    def __init__(self, status, code, message, details=None):
        super().__init__(f"{status} {code}: {message}")
        self.status, self.code, self.details = status, code, details


def api(method, path, body=None, headers=None):
    h = {"Content-Type": "application/json"}
    if TOKEN:
        h["Authorization"] = "Bearer " + TOKEN
    h.update(headers or {})
    r = requests.request(method, BASE + path, headers=h,
                         data=None if body is None else json.dumps(body))
    try:
        env = r.json()
    except ValueError:
        env = {}
    if not r.ok:
        err = env.get("error") or {}
        raise ApiError(r.status_code, err.get("code"), err.get("message") or r.reason, err.get("details"))
    return env.get("data")

// coroutine-desk.mjs -- Node 18+ (global fetch), run with: node coroutine-desk.mjs
import { readFileSync } from "node:fs";
import { createHash } from "node:crypto";

const BASE = "https://api.skillsafe.ai/v1/app-api";
let TOKEN = "YOUR_TOKEN"; // step 2

async function api(method, path, body, headers = {}) {
  const h = { "Content-Type": "application/json", ...headers };
  if (TOKEN) h.Authorization = "Bearer " + TOKEN;
  const res = await fetch(BASE + path, {
    method,
    headers: h,
    body: body === undefined ? undefined : JSON.stringify(body),
  });
  const json = await res.json().catch(() => ({}));
  if (!res.ok) {
    const err = new Error((json.error && json.error.message) || res.statusText);
    err.status = res.status;
    err.code = json.error && json.error.code;
    err.details = json.error && json.error.details;
    throw err;
  }
  return json.data;
}

package main

import (
	"bufio"
	"bytes"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"strings"
	"time"
)

const base = "https://api.skillsafe.ai/v1/app-api"

var token = os.Getenv("SKILLSAFE_TOKEN") // step 2

type apiError struct {
	Status  int
	Code    string
	Message string
}

func (e *apiError) Error() string { return fmt.Sprintf("%d %s: %s", e.Status, e.Code, e.Message) }

type envelope struct {
	OK    bool            `json:"ok"`
	Data  json.RawMessage `json:"data"`
	Error *struct {
		Code    string `json:"code"`
		Message string `json:"message"`
	} `json:"error"`
}

func newRequest(method, path string, body any, headers map[string]string) (*http.Request, error) {
	var buf []byte
	if body != nil {
		b, err := json.Marshal(body)
		if err != nil {
			return nil, err
		}
		buf = b
	}
	req, err := http.NewRequest(method, base+path, bytes.NewReader(buf))
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", "application/json")
	if token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}
	for k, v := range headers {
		req.Header.Set(k, v)
	}
	return req, nil
}

func errorFrom(res *http.Response, env envelope) error {
	e := &apiError{Status: res.StatusCode, Message: http.StatusText(res.StatusCode)}
	if env.Error != nil {
		e.Code = env.Error.Code
		if env.Error.Message != "" {
			e.Message = env.Error.Message
		}
	}
	return e
}

// api sends body as JSON and decodes the envelope's data into out (out may be nil).
func api(method, path string, body any, headers map[string]string, out any) error {
	req, err := newRequest(method, path, body, headers)
	if err != nil {
		return err
	}
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return err
	}
	defer res.Body.Close()
	var env envelope
	_ = json.NewDecoder(res.Body).Decode(&env)
	if res.StatusCode < 200 || res.StatusCode > 299 {
		return errorFrom(res, env)
	}
	if out != nil && len(env.Data) > 0 {
		return json.Unmarshal(env.Data, out)
	}
	return nil
}

func main() {
	// steps 2-6 go here; remove any import a step you skip no longer uses
	_, _, _, _, _ = bufio.NewScanner, sha256.Sum256, hex.EncodeToString, url.PathEscape, strings.Index
	_ = time.Second
}

// CoroutineDesk.java -- Java 17+, needs com.fasterxml.jackson.core:jackson-databind on the classpath
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.net.URI;
import java.net.URLEncoder;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.MessageDigest;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class CoroutineDesk {
  static final String BASE = "https://api.skillsafe.ai/v1/app-api";
  static String token = System.getenv().getOrDefault("SKILLSAFE_TOKEN", "YOUR_TOKEN"); // step 2
  static final HttpClient HTTP = HttpClient.newHttpClient();
  static final ObjectMapper JSON = new ObjectMapper();

  static class ApiException extends Exception {
    final int status;
    final String code;
    ApiException(int status, String code, String message) {
      super(status + " " + code + ": " + message);
      this.status = status;
      this.code = code;
    }
  }

  static HttpRequest.Builder request(String method, String path, Object body, Map<String, String> headers) throws Exception {
    HttpRequest.Builder b = HttpRequest.newBuilder(URI.create(BASE + path))
        .header("Content-Type", "application/json")
        .method(method, body == null ? HttpRequest.BodyPublishers.noBody()
                                     : HttpRequest.BodyPublishers.ofString(JSON.writeValueAsString(body)));
    if (token != null && !token.isEmpty()) b.header("Authorization", "Bearer " + token);
    if (headers != null) headers.forEach(b::header);
    return b;
  }

  static ApiException errorFrom(int status, JsonNode env) {
    JsonNode err = env.path("error");
    return new ApiException(status, err.path("code").asText(null), err.path("message").asText("HTTP " + status));
  }

  static JsonNode api(String method, String path, Object body, Map<String, String> headers) throws Exception {
    HttpResponse<String> res = HTTP.send(request(method, path, body, headers).build(), HttpResponse.BodyHandlers.ofString());
    JsonNode env;
    try { env = JSON.readTree(res.body()); } catch (Exception e) { env = JSON.createObjectNode(); }
    if (env == null) env = JSON.createObjectNode();
    if (res.statusCode() / 100 != 2) throw errorFrom(res.statusCode(), env);
    return env.path("data");
  }

  public static void main(String[] args) throws Exception {
    // steps 2-6 go here (makeInput from step 4 goes next to api())
  }
}

require "digest"
require "json"
require "net/http"
require "uri"

BASE = "https://api.skillsafe.ai/v1/app-api"
$token = ENV.fetch("SKILLSAFE_TOKEN", "YOUR_TOKEN") # step 2

class ApiError < StandardError
  attr_reader :status, :code
  def initialize(status, code, message)
    super("#{status} #{code}: #{message}")
    @status = status
    @code = code
  end
end

def build_request(method, path, body = nil, headers = {})
  uri = URI(BASE + path)
  req = Net::HTTPGenericRequest.new(method, !body.nil?, true, uri.request_uri)
  req["Content-Type"] = "application/json"
  req["Authorization"] = "Bearer #{$token}" if $token && !$token.empty?
  headers.each { |k, v| req[k] = v }
  req.body = JSON.generate(body) unless body.nil?
  [uri, req]
end

def api(method, path, body = nil, headers = {})
  uri, req = build_request(method, path, body, headers)
  res = Net::HTTP.start(uri.host, uri.port, use_ssl: true) { |h| h.request(req) }
  env = (JSON.parse(res.body) rescue {})
  env = {} unless env.is_a?(Hash)
  unless res.is_a?(Net::HTTPSuccess)
    err = env["error"] || {}
    raise ApiError.new(res.code.to_i, err["code"], err["message"] || res.message)
  end
  env["data"]
end

<?php
// needs the curl extension
const BASE = "https://api.skillsafe.ai/v1/app-api";
$TOKEN = getenv("SKILLSAFE_TOKEN") ?: "YOUR_TOKEN"; // step 2

class ApiError extends Exception {
    public $status;
    public $apiCode;
    public function __construct($status, $code, $message) {
        parent::__construct("$status $code: $message");
        $this->status = $status;
        $this->apiCode = $code;
    }
}

function headers_for(array $extra = []): array {
    global $TOKEN;
    $h = ["Content-Type: application/json"];
    if ($TOKEN) $h[] = "Authorization: Bearer $TOKEN";
    foreach ($extra as $k => $v) $h[] = "$k: $v";
    return $h;
}

function api(string $method, string $path, $body = null, array $headers = []) {
    $ch = curl_init(BASE . $path);
    curl_setopt_array($ch, [
        CURLOPT_CUSTOMREQUEST => $method,
        CURLOPT_HTTPHEADER => headers_for($headers),
        CURLOPT_RETURNTRANSFER => true,
    ]);
    if ($body !== null) curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($body, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
    $raw = curl_exec($ch);
    if ($raw === false) throw new RuntimeException(curl_error($ch));
    $status = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
    curl_close($ch);
    $env = json_decode($raw);
    if (!is_object($env)) $env = new stdClass();
    if ($status < 200 || $status > 299) {
        $e = $env->error ?? new stdClass();
        throw new ApiError($status, $e->code ?? null, $e->message ?? "HTTP $status");
    }
    return $env->data ?? null;
}

// Program.cs -- .NET 6+ console app (implicit usings on) with top-level statements; steps 2-6 (with the MakeInput local function) go ABOVE this class
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;

static class Api
{
    public const string Base = "https://api.skillsafe.ai/v1/app-api";
    public static string Token = Environment.GetEnvironmentVariable("SKILLSAFE_TOKEN") ?? "YOUR_TOKEN"; // step 2
    public static readonly HttpClient Http = new HttpClient();

    public class ApiException : Exception
    {
        public int Status;
        public string? Code;
        public ApiException(int status, string? code, string message) : base($"{status} {code}: {message}")
        {
            Status = status;
            Code = code;
        }
    }

    public static HttpRequestMessage Request(string method, string path, object? body = null, IDictionary<string, string>? headers = null)
    {
        var req = new HttpRequestMessage(new HttpMethod(method), Base + path);
        if (body != null) req.Content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
        if (!string.IsNullOrEmpty(Token)) req.Headers.TryAddWithoutValidation("Authorization", "Bearer " + Token);
        if (headers != null) foreach (var kv in headers) req.Headers.TryAddWithoutValidation(kv.Key, kv.Value);
        return req;
    }

    public static ApiException ErrorFrom(HttpResponseMessage res, JsonNode? env)
    {
        var err = env?["error"];
        return new ApiException((int)res.StatusCode, err?["code"]?.GetValue<string>(),
            err?["message"]?.GetValue<string>() ?? res.ReasonPhrase ?? "error");
    }

    public static async Task<JsonNode?> Call(string method, string path, object? body = null, IDictionary<string, string>? headers = null)
    {
        using var req = Request(method, path, body, headers);
        using var res = await Http.SendAsync(req);
        var text = await res.Content.ReadAsStringAsync();
        JsonNode? env = null;
        try { env = JsonNode.Parse(text); } catch (JsonException) { }
        if (!res.IsSuccessStatusCode) throw ErrorFrom(res, env);
        return env?["data"];
    }
}

Step 2 — a token

Two kinds work:

• Personal — needed for a run. Both lanes are metered in credits on gpt-terra, so a run needs a signed-in (user) token (the page says “The audit run is metered, so it needs an account.”, or the same of the fix run) unless the estimate says sponsor_enabled. Sign in and copy your token from /tokens.html, then export it as SKILLSAFE_TOKEN (the samples fall back to the placeholder YOUR_TOKEN).
• Guest — enough for /me and /estimate. POST /guest with {"slug": "coroutine-desk"} and no Authorization header, exactly as sdk.js guest() does. The response’s data carries token and guest_id. Reuse a token you already hold rather than minting a new one each time.

# personal token (needed for a run): copy it from /tokens.html, then
#   export SKILLSAFE_TOKEN=...        and skip the rest of this block
# guest token (enough for /me and /estimate): no Authorization header on this one call
TOKEN=$(curl -sS -X POST "$BASE/guest" \
  -H "Content-Type: application/json" \
  -d '{"slug":"coroutine-desk"}' | jq -r '.data.token')
echo "guest token: ${TOKEN:0:12}..."

# personal token (needed for a run): set SKILLSAFE_TOKEN (from /tokens.html) and skip this
if TOKEN in ("", "YOUR_TOKEN"):
    TOKEN = ""                      # no Authorization header on /guest
    guest = api("POST", "/guest", {"slug": "coroutine-desk"})
    TOKEN = guest["token"]
    print("guest", guest.get("guest_id"))

// personal token (needed for a run): paste it from /tokens.html into TOKEN and skip this
if (!TOKEN || TOKEN === "YOUR_TOKEN") {
  TOKEN = "";                       // no Authorization header on /guest
  const guest = await api("POST", "/guest", { slug: "coroutine-desk" });
  TOKEN = guest.token;
  console.log("guest", guest.guest_id);
}

// inside main -- personal token (needed for a run): set SKILLSAFE_TOKEN (from /tokens.html) and skip this
if token == "" {
	var guest struct {
		Token   string `json:"token"`
		GuestID string `json:"guest_id"`
	}
	if err := api("POST", "/guest", map[string]string{"slug": "coroutine-desk"}, nil, &guest); err != nil {
		panic(err)
	}
	token = guest.Token
	fmt.Println("guest", guest.GuestID)
}

// inside main -- personal token (needed for a run): set SKILLSAFE_TOKEN (from /tokens.html) and skip this
if (token.isEmpty() || token.equals("YOUR_TOKEN")) {
  token = "";                       // no Authorization header on /guest
  JsonNode guest = api("POST", "/guest", Map.of("slug", "coroutine-desk"), null);
  token = guest.path("token").asText();
  System.out.println("guest " + guest.path("guest_id").asText());
}

# personal token (needed for a run): set SKILLSAFE_TOKEN (from /tokens.html) and skip this
if $token.empty? || $token == "YOUR_TOKEN"
  $token = ""                       # no Authorization header on /guest
  guest = api("POST", "/guest", { slug: "coroutine-desk" })
  $token = guest["token"]
  puts "guest #{guest["guest_id"]}"
end

// personal token (needed for a run): set SKILLSAFE_TOKEN (from /tokens.html) and skip this
if ($TOKEN === "" || $TOKEN === "YOUR_TOKEN") {
    $TOKEN = "";                    // no Authorization header on /guest
    $guest = api("POST", "/guest", ["slug" => "coroutine-desk"]);
    $TOKEN = $guest->token;
    echo "guest {$guest->guest_id}\n";
}

// top-level statements (above the Api class) -- personal token (needed for a run): set SKILLSAFE_TOKEN (from /tokens.html) and skip this
if (Api.Token == "" || Api.Token == "YOUR_TOKEN")
{
    Api.Token = "";                 // no Authorization header on /guest
    var guest = await Api.Call("POST", "/guest", new { slug = "coroutine-desk" });
    Api.Token = guest!["token"]!.GetValue<string>();
    Console.WriteLine($"guest {guest["guest_id"]}");
}

Step 3 — GET /me

Who the token belongs to and what it can spend. sdk.js documents the shape as {subject_type, subject_id, credits, profile?}. The page treats the caller as signed in only when subject_type is "user", shows credits as the balance (1 credit = $0.0001, so it divides by 10 000 for the dollar figure), and compares it with the estimate in step 4 before it lets you run.

api GET /me | jq '.data // .error'

me = api("GET", "/me")
print(me["subject_type"], me.get("subject_id"), me.get("credits"))
signed_in = me["subject_type"] == "user"

const me = await api("GET", "/me");
console.log(me.subject_type, me.subject_id, me.credits);
const signedIn = me.subject_type === "user";

var me struct {
	SubjectType string `json:"subject_type"`
	SubjectID   any    `json:"subject_id"`
	Credits     any    `json:"credits"`
}
if err := api("GET", "/me", nil, nil, &me); err != nil {
	panic(err)
}
fmt.Println(me.SubjectType, me.SubjectID, me.Credits)
signedIn := me.SubjectType == "user"
_ = signedIn

JsonNode me = api("GET", "/me", null, null);
System.out.println(me.path("subject_type").asText() + " " + me.path("subject_id").asText() + " " + me.path("credits"));
boolean signedIn = me.path("subject_type").asText().equals("user");

me = api("GET", "/me")
puts [me["subject_type"], me["subject_id"], me["credits"]].join(" ")
signed_in = me["subject_type"] == "user"

$me = api("GET", "/me");
echo $me->subject_type, " ", $me->subject_id ?? "", " ", $me->credits ?? "", "\n";
$signedIn = $me->subject_type === "user";

var me = await Api.Call("GET", "/me");
Console.WriteLine($"{me?["subject_type"]} {me?["subject_id"]} {me?["credits"]}");
var signedIn = me?["subject_type"]?.GetValue<string>() == "user";

Step 4 — build the input, then POST /estimate

First a small makeInput that does what buildInput does: task, then code as the paste the page would send, facts as a compact JSON string, the note when it is not blank, and — for the fix lane only — the audit_handoff string when the file carries one. It reads the file build-check.js (or handoff.js) printed. The samples build the audit input of the orders example from orders-check.json; step 6 reuses makeInput for the tracker (fix) example. Then price it. The body of /estimate is the same input you will send to /run; no job is created and nothing is charged — /estimate is free. From the response the page reads:

The page re-prices whenever the paste, the note or the lane change. The amounts grow with the size of code and facts, so read them from the call rather than hard-coding them.

# orders-check.json: printed by build-check.js (see "The facts string").
# (.facts | tojson) turns the facts into ONE compact string, as JSON.stringify does.
BODY=$(jq -c --arg note "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller." \
  '{task: "audit", code, facts: (.facts | tojson), note: $note}' orders-check.json)
# No page check at hand? facts: "{}" is accepted as a string, but the reply then has no page flags to answer.
# Fix lane after an audit: read handoff.js's output instead and add its string:
#   '{task: "fix", code, facts: (.facts | tojson), note: $note} + (if .audit_handoff then {audit_handoff} else {} end)'

api POST /estimate -d "$BODY" \
  | jq '.error // (.data | {hold_credits, min_credits, sponsor_enabled, warnings})'

def make_input(task, check_path, note=None):
    """The body the page sends: task, code, facts as a JSON STRING, an optional note, and
    (fix lane only) the audit_handoff string -- every value a string."""
    with open(check_path, encoding="utf-8") as f:
        check = json.load(f)                    # build-check.js (or handoff.js) output
    inp = {
        "task": task,
        "code": check["code"],                  # the paste as the page sends it
        "facts": json.dumps(check["facts"], separators=(",", ":"), ensure_ascii=False),  # a STRING, like JSON.stringify
    }
    n = (note or "").strip()
    if n:
        inp["note"] = n[:2000]                  # optional; the page caps it at 2000 chars
    if task == "fix" and check.get("audit_handoff"):
        inp["audit_handoff"] = check["audit_handoff"]   # optional; already a JSON string
    return inp


inp = make_input("audit", "orders-check.json",
                 "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.")

est = api("POST", "/estimate", inp)
print("hold", est.get("hold_credits"), "min", est.get("min_credits"),
      "sponsored", est.get("sponsor_enabled"), "warnings", est.get("warnings") or [])

// The body the page sends: task, code, facts as a JSON STRING, an optional note,
// and (fix lane only) the audit_handoff string -- every value a string.
function makeInput(task, checkPath, note) {
  const check = JSON.parse(readFileSync(checkPath, "utf8"));          // build-check.js (or handoff.js) output
  const input = {
    task,
    code: check.code,                                                 // the paste as the page sends it
    facts: JSON.stringify(check.facts),                               // a STRING: the page's free check
  };
  const n = (note || "").trim();
  if (n) input.note = n.length > 2000 ? n.slice(0, 2000) : n;         // optional; max 2000 chars
  if (task === "fix" && check.audit_handoff) input.audit_handoff = check.audit_handoff;  // optional
  return input;
}

const input = makeInput("audit", "orders-check.json",
  "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.");

const est = await api("POST", "/estimate", input);
console.log("hold", est.hold_credits, "min", est.min_credits,
  "sponsored", est.sponsor_enabled, "warnings", est.warnings || []);

// makeInput builds the body the page sends: task, code, facts as a JSON STRING,
// an optional note and (fix lane only) the audit_handoff string.
makeInput := func(task, checkPath, note string) map[string]any {
	raw, err := os.ReadFile(checkPath) // build-check.js (or handoff.js) output
	if err != nil {
		panic(err)
	}
	var check struct {
		Code         string          `json:"code"`
		Facts        json.RawMessage `json:"facts"`
		AuditHandoff string          `json:"audit_handoff"`
	}
	if err := json.Unmarshal(raw, &check); err != nil {
		panic(err)
	}
	var facts bytes.Buffer
	if err := json.Compact(&facts, check.Facts); err != nil { // keeps key order; travels as a STRING
		panic(err)
	}
	in := map[string]any{"task": task, "code": check.Code, "facts": facts.String()}
	if n := []rune(strings.TrimSpace(note)); len(n) > 0 {
		if len(n) > 2000 {
			n = n[:2000] // optional; the page caps it at 2000 chars
		}
		in["note"] = string(n)
	}
	if task == "fix" && check.AuditHandoff != "" {
		in["audit_handoff"] = check.AuditHandoff // optional; already a JSON string
	}
	return in
}

input := makeInput("audit", "orders-check.json",
	"Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.")

var est struct {
	HoldCredits    any   `json:"hold_credits"`
	MinCredits     any   `json:"min_credits"`
	SponsorEnabled bool  `json:"sponsor_enabled"`
	Warnings       []any `json:"warnings"`
}
if err := api("POST", "/estimate", input, nil, &est); err != nil {
	panic(err)
}
fmt.Printf("hold %v min %v sponsored %v warnings %v\n", est.HoldCredits, est.MinCredits, est.SponsorEnabled, est.Warnings)

// ---- add to the CoroutineDesk class, next to api(): the body the page sends
static Map<String, Object> makeInput(String task, String checkPath, String note) throws Exception {
  JsonNode check = JSON.readTree(Files.readString(Path.of(checkPath)));        // build-check.js (or handoff.js) output
  Map<String, Object> in = new LinkedHashMap<>();
  in.put("task", task);
  in.put("code", check.path("code").asText());                                 // the paste as the page sends it
  in.put("facts", JSON.writeValueAsString(check.path("facts")));               // a STRING, compact
  String n = note == null ? "" : note.strip();
  if (!n.isEmpty()) in.put("note", n.length() > 2000 ? n.substring(0, 2000) : n);  // optional; max 2000 chars
  if (task.equals("fix") && check.hasNonNull("audit_handoff")) in.put("audit_handoff", check.get("audit_handoff").asText());
  return in;
}

// ---- inside main
Map<String, Object> input = makeInput("audit", "orders-check.json",
    "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.");

JsonNode est = api("POST", "/estimate", input, null);
System.out.println("hold " + est.path("hold_credits") + " min " + est.path("min_credits")
    + " sponsored " + est.path("sponsor_enabled").asBoolean(false) + " warnings " + est.path("warnings"));

# The body the page sends: task, code, facts as a JSON STRING, an optional note,
# and (fix lane only) the audit_handoff string -- every value a string.
def make_input(task, check_path, note = nil)
  check = JSON.parse(File.read(check_path, encoding: "UTF-8"))   # build-check.js (or handoff.js) output
  input = {
    task: task,
    code: check["code"],                                            # the paste as the page sends it
    facts: JSON.generate(check["facts"])                            # a STRING, compact
  }
  n = note.to_s.strip
  input[:note] = n[0, 2000] unless n.empty?                         # optional; max 2000 chars
  input[:audit_handoff] = check["audit_handoff"] if task == "fix" && !check["audit_handoff"].to_s.empty?
  input
end

input = make_input("audit", "orders-check.json",
                   "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.")

est = api("POST", "/estimate", input)
puts "hold #{est["hold_credits"]} min #{est["min_credits"]} " \
     "sponsored #{est["sponsor_enabled"]} warnings #{(est["warnings"] || []).inspect}"

// The body the page sends: task, code, facts as a JSON STRING, an optional note,
// and (fix lane only) the audit_handoff string -- every value a string.
function make_input(string $task, string $checkPath, string $note = ""): array {
    // decode to objects (not arrays) so an empty {} stays {} when re-encoded
    $check = json_decode(file_get_contents($checkPath));          // build-check.js (or handoff.js) output
    $input = [
        "task" => $task,
        "code" => $check->code,                                    // the paste as the page sends it
        "facts" => json_encode($check->facts, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE),  // a STRING
    ];
    $n = trim($note);
    if ($n !== "") $input["note"] = mb_substr($n, 0, 2000);        // optional; max 2000 chars
    if ($task === "fix" && !empty($check->audit_handoff)) $input["audit_handoff"] = $check->audit_handoff;
    return $input;
}

$input = make_input("audit", "orders-check.json",
    "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.");

$est = api("POST", "/estimate", $input);
echo "hold ", $est->hold_credits ?? "-", " min ", $est->min_credits ?? "-",
     " sponsored ", json_encode($est->sponsor_enabled ?? false),
     " warnings ", json_encode($est->warnings ?? []), "\n";

// The body the page sends: task, code, facts as a JSON STRING, an optional note,
// and (fix lane only) the audit_handoff string -- every value a string.
static Dictionary<string, string> MakeInput(string task, string checkPath, string? note = null)
{
    var compact = new JsonSerializerOptions { Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping };
    var check = JsonNode.Parse(File.ReadAllText(checkPath))!;               // build-check.js (or handoff.js) output
    var input = new Dictionary<string, string>
    {
        ["task"] = task,
        ["code"] = check["code"]!.GetValue<string>(),                         // the paste as the page sends it
        ["facts"] = check["facts"]!.ToJsonString(compact),                    // a STRING, compact
    };
    var n = (note ?? "").Trim();
    if (n.Length > 0) input["note"] = n.Length > 2000 ? n[..2000] : n;       // optional; max 2000 chars
    var handoff = check["audit_handoff"]?.GetValue<string>();
    if (task == "fix" && !string.IsNullOrEmpty(handoff)) input["audit_handoff"] = handoff;
    return input;
}

var input = MakeInput("audit", "orders-check.json",
    "Polling keeps hitting the orders API after the screen is closed, and the order list freezes the UI now and then. What do we fix first? Changing OrderRepository's constructor is fine - the ViewModel factory is its only caller.");

var est = await Api.Call("POST", "/estimate", input);
Console.WriteLine($"hold {est?["hold_credits"]} min {est?["min_credits"]} " +
    $"sponsored {est?["sponsor_enabled"]} warnings {est?["warnings"]?.ToJsonString() ?? "[]"}");

Step 5 — POST /run, then poll the job (audit)

Send the same input to /run with an Idempotency-Key header, using a personal token. Its data carries a job_id. Poll GET /jobs/{job_id} the way sdk.js waitForJob does: every second until status is succeeded or failed, giving up on the client side after 180 seconds. On the finished job, read:

• output.output — the model’s reply as a string: the JSON object from the output contract of the lane you asked for. Parse it yourself (from the first { to the last }). The samples print the verdict and headline, each area’s status, each finding’s id, file, line, severity and number of edits, then each flag answer. Keep the text: recheck.js reads it.
• truncated — true when the reply was cut short because the balance ran out. The page then closes the cut-off JSON, shows what arrived as a partial result (“N of 9 sections recovered” for an audit, of 8 for a fix run), and says it was cut short by the available balance.
• charged_credits — the real cost of the run, as opposed to the estimate’s hold_credits reservation. The page re-reads /me afterwards for the new balance.
• error — on a failed job.

Idempotency key. Resending a request with the same key must not start a second paid run, so derive the key from the input, not from the clock — and include the lane, so an audit and a fix run of the same paste never share a key. The page uses coroutine-desk:<lane>:<inputHash>:a<attempt> (app.js run), where <lane> is audit or fix, <inputHash> is a 32-bit djb2 hash of JSON.stringify(input) in hex, a dash, and the string’s length in hex (app.js inputHash, over the input without retry_note), and <attempt> is 1 for a normal run and 2 for the automatic reformat retry (which also adds retry_note). For the two worked examples that is coroutine-desk:audit:b94f0c30-320c:a1 (orders audit) and coroutine-desk:fix:e99d934e-1968:a1 (tracker fix); the fix run of the orders audit handed on (the example key orders:fix, above) is coroutine-desk:fix:f7f6c1dc-3319:a1. The format is the page’s convention, not a requirement: any stable, unique string does. The samples below use the lane and a SHA-256 prefix.

The page itself uses /run-stream (step 6), not /run; both take the same body and header.

KEY="coroutine-desk:audit:$(printf '%s' "$BODY" | shasum -a 256 | cut -c1-16):a1"

JOB=$(api POST /run -H "Idempotency-Key: $KEY" -d "$BODY" | jq -r '.data.job_id')

for i in $(seq 180); do                       # 1 s interval, 180 s client-side limit
  J=$(api GET "/jobs/$JOB")
  S=$(printf '%s' "$J" | jq -r '.data.status')
  if [ "$S" = "succeeded" ] || [ "$S" = "failed" ]; then break; fi
  sleep 1
done

printf '%s' "$J" | jq '.data | {status, truncated, charged_credits, error}'
printf '%s' "$J" | jq -r '.data.output.output' \
  | jq '{verdict, headline, areas: [(.areas // [])[] | {area, status}],
         findings: [(.findings // [])[] | {id, file, line, severity, edits: ((.edits // []) | length)}],
         flag_answers: [(.flag_answers // [])[] | {flag, status}]}'

body = json.dumps(inp)
key = "coroutine-desk:audit:" + hashlib.sha256(body.encode()).hexdigest()[:16] + ":a1"

job_id = api("POST", "/run", inp, {"Idempotency-Key": key})["job_id"]

deadline = time.time() + 180                    # 1 s interval, 180 s client-side limit
while True:
    job = api("GET", "/jobs/" + urllib.parse.quote(job_id, safe=""))
    if job["status"] in ("succeeded", "failed"):
        break
    if time.time() > deadline:
        raise TimeoutError("job timed out")
    time.sleep(1)

if job["status"] == "failed":
    raise SystemExit(f"run failed: {job.get('error')}")

print("truncated:", job.get("truncated") is True, "charged:", job.get("charged_credits"))
text = (job.get("output") or {}).get("output") or ""
reply = json.loads(text[text.index("{"): text.rindex("}") + 1])
print(reply["verdict"], "-", reply["headline"])
for s in reply.get("areas", []):
    print("area", s["area"], s["status"])
for f in reply.get("findings", []):
    print(f["id"], f["file"], f.get("line"), f["severity"], len(f.get("edits") or []), "edit(s)")
for a in reply.get("flag_answers", []):
    print("answer", a["flag"], a["status"])

const key = "coroutine-desk:audit:" +
  createHash("sha256").update(JSON.stringify(input)).digest("hex").slice(0, 16) + ":a1";

const { job_id } = await api("POST", "/run", input, { "Idempotency-Key": key });

let job;
const deadline = Date.now() + 180000;           // 1 s interval, 180 s client-side limit
for (;;) {
  job = await api("GET", "/jobs/" + encodeURIComponent(job_id));
  if (job.status === "succeeded" || job.status === "failed") break;
  if (Date.now() > deadline) throw new Error("job timed out");
  await new Promise((r) => setTimeout(r, 1000));
}
if (job.status === "failed") throw new Error("run failed: " + JSON.stringify(job.error));

console.log("truncated:", job.truncated === true, "charged:", job.charged_credits);
const text = (job.output && job.output.output) || "";
const reply = JSON.parse(text.slice(text.indexOf("{"), text.lastIndexOf("}") + 1));
console.log(reply.verdict, "-", reply.headline);
for (const s of reply.areas || []) console.log("area", s.area, s.status);
for (const f of reply.findings || []) console.log(f.id, f.file, f.line, f.severity, (f.edits || []).length, "edit(s)");
for (const a of reply.flag_answers || []) console.log("answer", a.flag, a.status);

inputJSON, _ := json.Marshal(input)
sum := sha256.Sum256(inputJSON)
key := "coroutine-desk:audit:" + hex.EncodeToString(sum[:8]) + ":a1"

var started struct {
	JobID string `json:"job_id"`
}
if err := api("POST", "/run", input, map[string]string{"Idempotency-Key": key}, &started); err != nil {
	panic(err)
}

type jobT struct {
	Status string `json:"status"`
	Output *struct {
		Output string `json:"output"`
	} `json:"output"`
	Truncated      bool `json:"truncated"`
	ChargedCredits any  `json:"charged_credits"`
	Error          any  `json:"error"`
}
var job jobT
deadline := time.Now().Add(180 * time.Second) // 1 s interval, 180 s client-side limit
for {
	job = jobT{}
	if err := api("GET", "/jobs/"+url.PathEscape(started.JobID), nil, nil, &job); err != nil {
		panic(err)
	}
	if job.Status == "succeeded" || job.Status == "failed" {
		break
	}
	if time.Now().After(deadline) {
		panic("job timed out")
	}
	time.Sleep(time.Second)
}
if job.Status == "failed" {
	panic(fmt.Sprintf("run failed: %v", job.Error))
}

fmt.Println("truncated:", job.Truncated, "charged:", job.ChargedCredits)
text := ""
if job.Output != nil {
	text = job.Output.Output
}
var reply map[string]any
if a, b := strings.Index(text, "{"), strings.LastIndex(text, "}"); a >= 0 && b > a {
	if err := json.Unmarshal([]byte(text[a:b+1]), &reply); err != nil {
		panic(err)
	}
}
fmt.Println(reply["verdict"], "-", reply["headline"])
areas, _ := reply["areas"].([]any)
for _, e := range areas {
	s, _ := e.(map[string]any)
	fmt.Println("area", s["area"], s["status"])
}
findings, _ := reply["findings"].([]any)
for _, e := range findings {
	f, _ := e.(map[string]any)
	edits, _ := f["edits"].([]any)
	fmt.Println(f["id"], f["file"], f["line"], f["severity"], len(edits), "edit(s)")
}
answers, _ := reply["flag_answers"].([]any)
for _, e := range answers {
	a, _ := e.(map[string]any)
	fmt.Println("answer", a["flag"], a["status"])
}

byte[] digest = MessageDigest.getInstance("SHA-256").digest(JSON.writeValueAsBytes(input));
String key = "coroutine-desk:audit:" + HexFormat.of().formatHex(digest, 0, 8) + ":a1";

String jobId = api("POST", "/run", input, Map.of("Idempotency-Key", key)).path("job_id").asText();

JsonNode job;
long deadline = System.currentTimeMillis() + 180_000;   // 1 s interval, 180 s client-side limit
while (true) {
  job = api("GET", "/jobs/" + URLEncoder.encode(jobId, StandardCharsets.UTF_8), null, null);
  String s = job.path("status").asText();
  if (s.equals("succeeded") || s.equals("failed")) break;
  if (System.currentTimeMillis() > deadline) throw new RuntimeException("job timed out");
  Thread.sleep(1000);
}
if (job.path("status").asText().equals("failed")) throw new RuntimeException("run failed: " + job.path("error"));

System.out.println("truncated: " + job.path("truncated").asBoolean(false) + ", charged: " + job.path("charged_credits"));
String text = job.path("output").path("output").asText("");
JsonNode reply = JSON.readTree(text.substring(text.indexOf('{'), text.lastIndexOf('}') + 1));
System.out.println(reply.path("verdict").asText() + " - " + reply.path("headline").asText());
for (JsonNode s : reply.path("areas")) {
  System.out.println("area " + s.path("area").asText() + " " + s.path("status").asText());
}
for (JsonNode f : reply.path("findings")) {
  System.out.println(f.path("id").asText() + " " + f.path("file").asText() + " " + f.path("line") + " "
      + f.path("severity").asText() + " " + f.path("edits").size() + " edit(s)");
}
for (JsonNode a : reply.path("flag_answers")) {
  System.out.println("answer " + a.path("flag").asText() + " " + a.path("status").asText());
}

key = "coroutine-desk:audit:#{Digest::SHA256.hexdigest(JSON.generate(input))[0, 16]}:a1"

job_id = api("POST", "/run", input, { "Idempotency-Key" => key })["job_id"]

deadline = Time.now + 180                       # 1 s interval, 180 s client-side limit
job = nil
loop do
  job = api("GET", "/jobs/#{URI.encode_www_form_component(job_id)}")
  break if %w[succeeded failed].include?(job["status"])
  raise "job timed out" if Time.now > deadline
  sleep 1
end
raise "run failed: #{job["error"].inspect}" if job["status"] == "failed"

puts "truncated: #{job["truncated"] == true}, charged: #{job["charged_credits"]}"
text = (job["output"] || {})["output"].to_s
reply = JSON.parse(text[text.index("{")..text.rindex("}")])
puts "#{reply["verdict"]} - #{reply["headline"]}"
(reply["areas"] || []).each { |s| puts "area #{s["area"]} #{s["status"]}" }
(reply["findings"] || []).each { |f| puts "#{f["id"]} #{f["file"]} #{f["line"].inspect} #{f["severity"]} #{(f["edits"] || []).size} edit(s)" }
(reply["flag_answers"] || []).each { |a| puts "answer #{a["flag"]} #{a["status"]}" }

$key = "coroutine-desk:audit:" . substr(hash("sha256", json_encode($input)), 0, 16) . ":a1";

$jobId = api("POST", "/run", $input, ["Idempotency-Key" => $key])->job_id;

$deadline = time() + 180;                       // 1 s interval, 180 s client-side limit
while (true) {
    $job = api("GET", "/jobs/" . rawurlencode($jobId));
    if (in_array($job->status, ["succeeded", "failed"], true)) break;
    if (time() > $deadline) throw new RuntimeException("job timed out");
    sleep(1);
}
if ($job->status === "failed") throw new RuntimeException("run failed: " . json_encode($job->error ?? null));

echo "truncated: ", json_encode(($job->truncated ?? false) === true), ", charged: ", $job->charged_credits ?? "-", "\n";
$text = $job->output->output ?? "";
$reply = json_decode(substr($text, strpos($text, "{"), strrpos($text, "}") - strpos($text, "{") + 1));
echo $reply->verdict, " - ", $reply->headline, "\n";
foreach ($reply->areas ?? [] as $s) echo "area ", $s->area, " ", $s->status, "\n";
foreach ($reply->findings ?? [] as $f) echo $f->id, " ", $f->file, " ", json_encode($f->line ?? null), " ", $f->severity, " ", count($f->edits ?? []), " edit(s)\n";
foreach ($reply->flag_answers ?? [] as $a) echo "answer ", $a->flag, " ", $a->status, "\n";

var digest = System.Security.Cryptography.SHA256.HashData(Encoding.UTF8.GetBytes(JsonSerializer.Serialize(input)));
var key = "coroutine-desk:audit:" + Convert.ToHexString(digest, 0, 8).ToLowerInvariant() + ":a1";

var started = await Api.Call("POST", "/run", input, new Dictionary<string, string> { ["Idempotency-Key"] = key });
var jobId = started!["job_id"]!.GetValue<string>();

JsonNode job;
var deadline = DateTime.UtcNow.AddSeconds(180);   // 1 s interval, 180 s client-side limit
while (true)
{
    job = (await Api.Call("GET", "/jobs/" + Uri.EscapeDataString(jobId)))!;
    var s = job["status"]?.GetValue<string>();
    if (s == "succeeded" || s == "failed") break;
    if (DateTime.UtcNow > deadline) throw new TimeoutException("job timed out");
    await Task.Delay(1000);
}
if (job["status"]?.GetValue<string>() == "failed") throw new Exception($"run failed: {job["error"]?.ToJsonString()}");

var truncated = job["truncated"] is JsonValue t && t.TryGetValue(out bool tb) && tb;
Console.WriteLine($"truncated: {truncated}, charged: {job["charged_credits"]}");
var text = job["output"]?["output"]?.GetValue<string>() ?? "";
var reply = JsonNode.Parse(text[text.IndexOf('{')..(text.LastIndexOf('}') + 1)])!;
Console.WriteLine($"{reply["verdict"]} - {reply["headline"]}");
foreach (var s in reply["areas"]?.AsArray() ?? new JsonArray())
    Console.WriteLine($"area {s?["area"]} {s?["status"]}");
foreach (var f in reply["findings"]?.AsArray() ?? new JsonArray())
    Console.WriteLine($"{f?["id"]} {f?["file"]} {f?["line"]?.ToJsonString() ?? "null"} {f?["severity"]} {f?["edits"]?.AsArray().Count ?? 0} edit(s)");
foreach (var a in reply["flag_answers"]?.AsArray() ?? new JsonArray())
    Console.WriteLine($"answer {a?["flag"]} {a?["status"]}");

Step 6 — POST /run-stream (Server-Sent Events, fix)

The alternative to step 5, and what the page uses: same kind of body, same Idempotency-Key header, one request. Run one or the other for a given input, not both. To show the second lane, the samples build the fix input of the tracker example (with its own key) and stream it; to stream the audit input instead, pass the step 4 input and key. The response is text/event-stream. sdk.js splits it into frames on a blank line, takes the event name from an event: line (default message) and concatenates the data: lines, skips frames with no data or with data that is not JSON, and handles these events:

If the response is not text/event-stream, it is an ordinary JSON envelope: the SDK returns its data (an idempotent replay returns this way) or raises the error on a non-2xx status. Handle both shapes.

From the final payload the page reads output.output (falling back to the concatenated delta text), truncated and charged_credits. Browsers receive progress ticks rather than deltas from this endpoint, so the page relies on the final payload; if the stream fails part-way, it tries to recover a partial reply from whatever delta text arrived. The samples print the verdict and headline, each returned file’s path and size, each change (function, flags and change), each verification step, each open item and each question. To put the files into the paste and re-check them the way the page’s “Put every file into the paste” does, keep the reply text and run recheck.js with the lane fix. To fix code you audited, read handoff.js’s output instead of tracker-check.json: makeInput then carries its audit_handoff.

# the fix worked example: tracker-check.json from build-check.js
# (for audited code, read handoff.js's output instead; the + (...) adds its audit_handoff)
FBODY=$(jq -c --arg note "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint." \
  '{task: "fix", code, facts: (.facts | tojson), note: $note} + (if .audit_handoff then {audit_handoff} else {} end)' \
  tracker-check.json)
FKEY="coroutine-desk:fix:$(printf '%s' "$FBODY" | shasum -a 256 | cut -c1-16):a1"

# -N turns off buffering; the whole stream lands in $STREAM
STREAM=$(api POST /run-stream -N -H "Idempotency-Key: $FKEY" -d "$FBODY")

# frames look like:
#   event: job
#   data: {...}
#
#   event: done
#   data: {"job_id":"...","status":"...","charged_credits":...,"output":{"output":"{\"task\":\"fix\",...}"}}

# the final reply text, from the done (or pending) frame:
REPLY=$(printf '%s\n' "$STREAM" \
  | awk '/^event:/{ev=$2} /^data:/ && (ev=="done" || ev=="pending"){sub(/^data: */,""); print}' \
  | jq -r '.output.output')
# an idempotent replay answers with a plain JSON envelope instead: REPLY=$(printf '%s' "$STREAM" | jq -r '.data.output.output')
printf '%s' "$REPLY" | jq '{verdict, headline,
  files: [(.files // [])[] | {path, characters: (.content | length)}],
  changes: [(.changes // [])[] | {function, flags, change}], verify, open, questions}'

# the fix worked example: tracker-check.json from build-check.js
# (for audited code, pass handoff.js's output instead: make_input adds its audit_handoff)
fix_inp = make_input("fix", "tracker-check.json",
                     "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.")
fix_key = "coroutine-desk:fix:" + hashlib.sha256(json.dumps(fix_inp).encode()).hexdigest()[:16] + ":a1"

h = {"Content-Type": "application/json", "Authorization": "Bearer " + TOKEN, "Idempotency-Key": fix_key}
done, failure, streamed = None, None, ""
with requests.post(BASE + "/run-stream", headers=h, data=json.dumps(fix_inp), stream=True) as r:
    if "text/event-stream" not in r.headers.get("content-type", ""):
        try:
            env = r.json()
        except ValueError:
            env = {}
        if not r.ok:
            err = env.get("error") or {}
            raise ApiError(r.status_code, err.get("code"), err.get("message") or r.reason)
        done = env.get("data")
    else:
        event, data = "message", ""
        for line in r.iter_lines(decode_unicode=True):
            if line == "":                          # a blank line ends a frame
                if data:
                    try:
                        payload = json.loads(data)
                    except ValueError:
                        payload = None
                    if event == "delta" and payload is not None:
                        streamed += payload.get("text") or ""
                    elif event == "job":
                        print("job", payload)
                    elif event in ("done", "pending"):
                        done = payload
                    elif event == "error":
                        failure = payload
                event, data = "message", ""
            elif line.startswith("event:"):
                event = line[6:].strip()
            elif line.startswith("data:"):
                data += line[5:].strip()

if failure:
    raise SystemExit(f"{failure.get('code')}: {failure.get('message')} (job {failure.get('job_id')})")
done = done or {}
full = (done.get("output") or {}).get("output") or streamed
print("truncated:", done.get("truncated") is True, "charged:", done.get("charged_credits"))
result = json.loads(full[full.index("{"): full.rindex("}") + 1])
print(result["verdict"], "-", result["headline"])
for f in result.get("files", []):
    print("file", f["path"], len(f.get("content") or ""), "characters")
for c in result.get("changes", []):
    print("change", c.get("function"), ",".join(c.get("flags") or []) or "-", "-", c.get("change"))
for step in result.get("verify", []):
    print("verify", step)
for o in result.get("open", []):
    print("open", o["item"], "-", o.get("reason"))
for q in result.get("questions", []):
    print("question", q)

// the fix worked example: tracker-check.json from build-check.js
// (for audited code, pass handoff.js's output instead: makeInput adds its audit_handoff)
const fixInput = makeInput("fix", "tracker-check.json",
  "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.");
const fixKey = "coroutine-desk:fix:" +
  createHash("sha256").update(JSON.stringify(fixInput)).digest("hex").slice(0, 16) + ":a1";

const res = await fetch(BASE + "/run-stream", {
  method: "POST",
  headers: { "Content-Type": "application/json", Authorization: "Bearer " + TOKEN, "Idempotency-Key": fixKey },
  body: JSON.stringify(fixInput),
});

let done = null, failure = null, streamed = "";
if (!(res.headers.get("content-type") || "").includes("text/event-stream")) {
  const json = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error((json.error && json.error.message) || res.statusText);
  done = json.data;
} else {
  const reader = res.body.getReader();
  const decoder = new TextDecoder();
  let buffer = "";
  for (;;) {
    const chunk = await reader.read();
    if (chunk.done) break;
    buffer += decoder.decode(chunk.value, { stream: true });
    let idx;
    while ((idx = buffer.indexOf("\n\n")) >= 0) {
      const frame = buffer.slice(0, idx);
      buffer = buffer.slice(idx + 2);
      let event = "message", dataStr = "";
      for (const line of frame.split("\n")) {
        if (line.startsWith("event:")) event = line.slice(6).trim();
        else if (line.startsWith("data:")) dataStr += line.slice(5).trim();
      }
      if (!dataStr) continue;
      let data;
      try { data = JSON.parse(dataStr); } catch { continue; }
      if (event === "delta") streamed += data.text || "";
      else if (event === "job") console.log("job", data);
      else if (event === "done" || event === "pending") done = data;
      else if (event === "error") failure = data;
    }
  }
}
if (failure) throw new Error(`${failure.code}: ${failure.message} (job ${failure.job_id})`);

const full = (done && done.output && done.output.output) || streamed;
console.log("truncated:", !!(done && done.truncated), "charged:", done && done.charged_credits);
const result = JSON.parse(full.slice(full.indexOf("{"), full.lastIndexOf("}") + 1));
console.log(result.verdict, "-", result.headline);
for (const f of result.files || []) console.log("file", f.path, (f.content || "").length, "characters");
for (const c of result.changes || []) console.log("change", c.function, (c.flags || []).join(",") || "-", "-", c.change);
for (const step of result.verify || []) console.log("verify", step);
for (const o of result.open || []) console.log("open", o.item, "-", o.reason);
for (const q of result.questions || []) console.log("question", q);

// the fix worked example: tracker-check.json from build-check.js
// (for audited code, pass handoff.js's output instead: makeInput adds its audit_handoff)
fixInput := makeInput("fix", "tracker-check.json",
	"Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.")
fixJSON, _ := json.Marshal(fixInput)
fixSum := sha256.Sum256(fixJSON)
fixKey := "coroutine-desk:fix:" + hex.EncodeToString(fixSum[:8]) + ":a1"

sreq, err := newRequest("POST", "/run-stream", fixInput, map[string]string{"Idempotency-Key": fixKey})
if err != nil {
	panic(err)
}
sres, err := http.DefaultClient.Do(sreq)
if err != nil {
	panic(err)
}
defer sres.Body.Close()

var done, failure map[string]any
var streamed strings.Builder
if !strings.Contains(sres.Header.Get("Content-Type"), "text/event-stream") {
	var env envelope
	_ = json.NewDecoder(sres.Body).Decode(&env)
	if sres.StatusCode < 200 || sres.StatusCode > 299 {
		panic(errorFrom(sres, env))
	}
	_ = json.Unmarshal(env.Data, &done)
} else {
	sc := bufio.NewScanner(sres.Body)
	sc.Buffer(make([]byte, 64*1024), 16*1024*1024) // the done frame can be long
	event, data := "message", ""
	for sc.Scan() {
		line := sc.Text()
		switch {
		case line == "": // a blank line ends a frame
			if data != "" {
				var p map[string]any
				if json.Unmarshal([]byte(data), &p) == nil {
					switch event {
					case "delta":
						if t, ok := p["text"].(string); ok {
							streamed.WriteString(t)
						}
					case "job":
						fmt.Println("job", p)
					case "done", "pending":
						done = p
					case "error":
						failure = p
					}
				}
			}
			event, data = "message", ""
		case strings.HasPrefix(line, "event:"):
			event = strings.TrimSpace(line[6:])
		case strings.HasPrefix(line, "data:"):
			data += strings.TrimSpace(line[5:])
		}
	}
}
if failure != nil {
	panic(fmt.Sprintf("%v: %v (job %v)", failure["code"], failure["message"], failure["job_id"]))
}

full := streamed.String()
if out, ok := done["output"].(map[string]any); ok {
	if s, ok := out["output"].(string); ok && s != "" {
		full = s
	}
}
fmt.Println("truncated:", done["truncated"] == true, "charged:", done["charged_credits"])
var result map[string]any
if a, b := strings.Index(full, "{"), strings.LastIndex(full, "}"); a >= 0 && b > a {
	if err := json.Unmarshal([]byte(full[a:b+1]), &result); err != nil {
		panic(err)
	}
}
fmt.Println(result["verdict"], "-", result["headline"])
files, _ := result["files"].([]any)
for _, e := range files {
	f, _ := e.(map[string]any)
	c, _ := f["content"].(string)
	fmt.Println("file", f["path"], len([]rune(c)), "characters")
}
changes, _ := result["changes"].([]any)
for _, e := range changes {
	c, _ := e.(map[string]any)
	var flags []string
	if fs, ok := c["flags"].([]any); ok {
		for _, fl := range fs {
			flags = append(flags, fmt.Sprint(fl))
		}
	}
	fl := strings.Join(flags, ",")
	if fl == "" {
		fl = "-"
	}
	fmt.Println("change", c["function"], fl, "-", c["change"])
}
verify, _ := result["verify"].([]any)
for _, st := range verify {
	fmt.Println("verify", st)
}
open, _ := result["open"].([]any)
for _, e := range open {
	o, _ := e.(map[string]any)
	fmt.Println("open", o["item"], "-", o["reason"])
}
questions, _ := result["questions"].([]any)
for _, q := range questions {
	fmt.Println("question", q)
}

// the fix worked example: tracker-check.json from build-check.js
// (for audited code, pass handoff.js's output instead: makeInput adds its audit_handoff)
Map<String, Object> fixInput = makeInput("fix", "tracker-check.json",
    "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.");
byte[] fixDigest = MessageDigest.getInstance("SHA-256").digest(JSON.writeValueAsBytes(fixInput));
String fixKey = "coroutine-desk:fix:" + HexFormat.of().formatHex(fixDigest, 0, 8) + ":a1";

HttpRequest sreq = request("POST", "/run-stream", fixInput, Map.of("Idempotency-Key", fixKey)).build();
HttpResponse<Stream<String>> sres = HTTP.send(sreq, HttpResponse.BodyHandlers.ofLines());

JsonNode done = null, failure = null;
StringBuilder streamed = new StringBuilder();
if (!sres.headers().firstValue("content-type").orElse("").contains("text/event-stream")) {
  JsonNode env = JSON.readTree(sres.body().collect(Collectors.joining("\n")));
  if (env == null) env = JSON.createObjectNode();
  if (sres.statusCode() / 100 != 2) throw errorFrom(sres.statusCode(), env);
  done = env.path("data");
} else {
  String event = "message";
  StringBuilder data = new StringBuilder();
  Iterator<String> it = sres.body().iterator();
  while (it.hasNext()) {
    String line = it.next();
    if (line.isEmpty()) {                        // a blank line ends a frame
      if (data.length() > 0) {
        JsonNode p = null;
        try { p = JSON.readTree(data.toString()); } catch (Exception ignored) { }
        if (p != null) {
          switch (event) {
            case "delta": streamed.append(p.path("text").asText("")); break;
            case "job": System.out.println("job " + p); break;
            case "done": case "pending": done = p; break;
            case "error": failure = p; break;
            default: break;
          }
        }
      }
      event = "message";
      data.setLength(0);
    } else if (line.startsWith("event:")) event = line.substring(6).trim();
    else if (line.startsWith("data:")) data.append(line.substring(5).trim());
  }
}
if (failure != null) {
  throw new RuntimeException(failure.path("code").asText() + ": " + failure.path("message").asText()
      + " (job " + failure.path("job_id").asText() + ")");
}

String full = done == null ? "" : done.path("output").path("output").asText("");
if (full.isEmpty()) full = streamed.toString();
System.out.println("truncated: " + (done != null && done.path("truncated").asBoolean(false))
    + ", charged: " + (done == null ? "-" : done.path("charged_credits").toString()));
JsonNode result = JSON.readTree(full.substring(full.indexOf('{'), full.lastIndexOf('}') + 1));
System.out.println(result.path("verdict").asText() + " - " + result.path("headline").asText());
for (JsonNode f : result.path("files")) {
  System.out.println("file " + f.path("path").asText() + " " + f.path("content").asText("").codePointCount(0, f.path("content").asText("").length()) + " characters");
}
for (JsonNode c : result.path("changes")) {
  List<String> flags = new ArrayList<>();
  c.path("flags").forEach(fl -> flags.add(fl.asText()));
  System.out.println("change " + c.path("function").asText() + " " + (flags.isEmpty() ? "-" : String.join(",", flags))
      + " - " + c.path("change").asText());
}
for (JsonNode step : result.path("verify")) System.out.println("verify " + step.asText());
for (JsonNode o : result.path("open")) System.out.println("open " + o.path("item").asText() + " - " + o.path("reason").asText());
for (JsonNode q : result.path("questions")) System.out.println("question " + q.asText());

# the fix worked example: tracker-check.json from build-check.js
# (for audited code, pass handoff.js's output instead: make_input adds its audit_handoff)
fix_input = make_input("fix", "tracker-check.json",
                       "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.")
fix_key = "coroutine-desk:fix:#{Digest::SHA256.hexdigest(JSON.generate(fix_input))[0, 16]}:a1"

uri, req = build_request("POST", "/run-stream", fix_input, { "Idempotency-Key" => fix_key })
done = failure = nil
streamed = +""

Net::HTTP.start(uri.host, uri.port, use_ssl: true, read_timeout: 300) do |http|
  http.request(req) do |res|
    unless res["content-type"].to_s.include?("text/event-stream")
      env = (JSON.parse(res.body) rescue {})
      unless res.is_a?(Net::HTTPSuccess)
        raise ApiError.new(res.code.to_i, env.dig("error", "code"), env.dig("error", "message") || res.message)
      end
      done = env["data"]
      next
    end
    buf = +""
    res.read_body do |chunk|
      buf << chunk
      while (i = buf.index("\n\n"))
        frame = buf.slice!(0, i + 2)
        event = "message"
        data = +""
        frame.split("\n").each do |line|
          if line.start_with?("event:") then event = line[6..].strip
          elsif line.start_with?("data:") then data << line[5..].strip
          end
        end
        next if data.empty?
        payload = (JSON.parse(data) rescue nil)
        next if payload.nil?
        case event
        when "delta" then streamed << payload["text"].to_s
        when "job" then puts "job #{payload.inspect}"
        when "done", "pending" then done = payload
        when "error" then failure = payload
        end
      end
    end
  end
end

raise "#{failure["code"]}: #{failure["message"]} (job #{failure["job_id"]})" if failure
done ||= {}
full = (done["output"] || {})["output"].to_s
full = streamed if full.empty?
puts "truncated: #{done["truncated"] == true}, charged: #{done["charged_credits"]}"
result = JSON.parse(full[full.index("{")..full.rindex("}")])
puts "#{result["verdict"]} - #{result["headline"]}"
(result["files"] || []).each { |f| puts "file #{f["path"]} #{f["content"].to_s.length} characters" }
(result["changes"] || []).each do |c|
  flags = (c["flags"] || []).join(",")
  puts "change #{c["function"]} #{flags.empty? ? "-" : flags} - #{c["change"]}"
end
(result["verify"] || []).each { |step| puts "verify #{step}" }
(result["open"] || []).each { |o| puts "open #{o["item"]} - #{o["reason"]}" }
(result["questions"] || []).each { |q| puts "question #{q}" }

// the fix worked example: tracker-check.json from build-check.js
// (for audited code, pass handoff.js's output instead: make_input adds its audit_handoff)
$fixInput = make_input("fix", "tracker-check.json",
    "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.");
$fixKey = "coroutine-desk:fix:" . substr(hash("sha256", json_encode($fixInput)), 0, 16) . ":a1";

$done = null; $failure = null; $streamed = ""; $buf = ""; $ctype = "";

$handle = function (string $event, string $data) use (&$done, &$failure, &$streamed) {
    $p = json_decode($data);
    if ($p === null) return;                    // not JSON: skipped, as sdk.js does
    switch ($event) {
        case "delta": $streamed .= $p->text ?? ""; break;
        case "job": echo "job ", json_encode($p), "\n"; break;
        case "done": case "pending": $done = $p; break;
        case "error": $failure = $p; break;
    }
};

$ch = curl_init(BASE . "/run-stream");
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => headers_for(["Idempotency-Key" => $fixKey]),
    CURLOPT_POSTFIELDS => json_encode($fixInput, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE),
    CURLOPT_HEADERFUNCTION => function ($ch, $line) use (&$ctype) {
        if (stripos($line, "content-type:") === 0) $ctype = strtolower(trim(substr($line, 13)));
        return strlen($line);
    },
    CURLOPT_WRITEFUNCTION => function ($ch, $chunk) use (&$buf, &$ctype, $handle) {
        $buf .= $chunk;                         // collects the response in memory
        if (strpos($ctype, "text/event-stream") === false) return strlen($chunk); // plain JSON: parse at the end
        while (($i = strpos($buf, "\n\n")) !== false) {
            $frame = substr($buf, 0, $i);
            $buf = substr($buf, $i + 2);
            $event = "message"; $data = "";
            foreach (explode("\n", $frame) as $line) {
                if (strpos($line, "event:") === 0) $event = trim(substr($line, 6));
                elseif (strpos($line, "data:") === 0) $data .= trim(substr($line, 5));
            }
            if ($data !== "") $handle($event, $data);
        }
        return strlen($chunk);
    },
]);
if (curl_exec($ch) === false) throw new RuntimeException(curl_error($ch));
$status = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
curl_close($ch);

if (strpos($ctype, "text/event-stream") === false) {
    $env = json_decode($buf) ?? new stdClass();
    if ($status < 200 || $status > 299) {
        throw new ApiError($status, $env->error->code ?? null, $env->error->message ?? "HTTP $status");
    }
    $done = $env->data ?? null;
}
if ($failure) throw new RuntimeException(($failure->code ?? "") . ": " . ($failure->message ?? "") . " (job " . ($failure->job_id ?? "") . ")");

$full = $done->output->output ?? "";
if ($full === "") $full = $streamed;
echo "truncated: ", json_encode(($done->truncated ?? false) === true), ", charged: ", $done->charged_credits ?? "-", "\n";
$result = json_decode(substr($full, strpos($full, "{"), strrpos($full, "}") - strpos($full, "{") + 1));
echo $result->verdict, " - ", $result->headline, "\n";
foreach ($result->files ?? [] as $f) echo "file ", $f->path, " ", mb_strlen($f->content ?? ""), " characters\n";
foreach ($result->changes ?? [] as $c) {
    $flags = implode(",", $c->flags ?? []);
    echo "change ", $c->function ?? "", " ", $flags === "" ? "-" : $flags, " - ", $c->change ?? "", "\n";
}
foreach ($result->verify ?? [] as $step) echo "verify ", $step, "\n";
foreach ($result->open ?? [] as $o) echo "open ", $o->item, " - ", $o->reason ?? "", "\n";
foreach ($result->questions ?? [] as $q) echo "question ", $q, "\n";

// the fix worked example: tracker-check.json from build-check.js
// (for audited code, pass handoff.js's output instead: MakeInput adds its audit_handoff)
var fixInput = MakeInput("fix", "tracker-check.json",
    "Recording crashes as soon as it starts and finish() pins a CPU core. Fix those two. Leave the launch(SupervisorJob()) in record() exactly as it is for now - the platform team moves the recorder onto its own supervised scope next sprint.");
var fixDigest = System.Security.Cryptography.SHA256.HashData(Encoding.UTF8.GetBytes(JsonSerializer.Serialize(fixInput)));
var fixKey = "coroutine-desk:fix:" + Convert.ToHexString(fixDigest, 0, 8).ToLowerInvariant() + ":a1";

using var sreq = Api.Request("POST", "/run-stream", fixInput, new Dictionary<string, string> { ["Idempotency-Key"] = fixKey });
using var sres = await Api.Http.SendAsync(sreq, HttpCompletionOption.ResponseHeadersRead);

JsonNode? done = null, failure = null;
var streamed = new StringBuilder();
if (sres.Content.Headers.ContentType?.MediaType != "text/event-stream")
{
    JsonNode? env = null;
    try { env = JsonNode.Parse(await sres.Content.ReadAsStringAsync()); } catch (JsonException) { }
    if (!sres.IsSuccessStatusCode) throw Api.ErrorFrom(sres, env);
    done = env?["data"];
}
else
{
    using var reader = new StreamReader(await sres.Content.ReadAsStreamAsync());
    var ev = "message";
    var data = new StringBuilder();
    string? line;
    while ((line = await reader.ReadLineAsync()) != null)
    {
        if (line.Length == 0)                    // a blank line ends a frame
        {
            if (data.Length > 0)
            {
                JsonNode? p = null;
                try { p = JsonNode.Parse(data.ToString()); } catch (JsonException) { }
                if (p != null)
                {
                    switch (ev)
                    {
                        case "delta": streamed.Append(p["text"]?.GetValue<string>() ?? ""); break;
                        case "job": Console.WriteLine($"job {p.ToJsonString()}"); break;
                        case "done": case "pending": done = p; break;
                        case "error": failure = p; break;
                    }
                }
            }
            ev = "message";
            data.Clear();
        }
        else if (line.StartsWith("event:")) ev = line[6..].Trim();
        else if (line.StartsWith("data:")) data.Append(line[5..].Trim());
    }
}
if (failure != null) throw new Exception($"{failure["code"]}: {failure["message"]} (job {failure["job_id"]})");

var full = done?["output"]?["output"]?.GetValue<string>();
if (string.IsNullOrEmpty(full)) full = streamed.ToString();
var cut = done?["truncated"] is JsonValue tv && tv.TryGetValue(out bool cutShort) && cutShort;
Console.WriteLine($"truncated: {cut}, charged: {done?["charged_credits"]}");
var result = JsonNode.Parse(full[full.IndexOf('{')..(full.LastIndexOf('}') + 1)])!;
Console.WriteLine($"{result["verdict"]} - {result["headline"]}");
foreach (var f in result["files"]?.AsArray() ?? new JsonArray())
    Console.WriteLine($"file {f?["path"]} {(f?["content"]?.GetValue<string>() ?? "").Length} characters");
foreach (var c in result["changes"]?.AsArray() ?? new JsonArray())
{
    var flags = string.Join(",", (c?["flags"]?.AsArray() ?? new JsonArray()).Select(fl => fl?.GetValue<string>()));
    Console.WriteLine($"change {c?["function"]} {(flags == "" ? "-" : flags)} - {c?["change"]}");
}
foreach (var step in result["verify"]?.AsArray() ?? new JsonArray()) Console.WriteLine($"verify {step}");
foreach (var o in result["open"]?.AsArray() ?? new JsonArray()) Console.WriteLine($"open {o?["item"]} - {o?["reason"]}");
foreach (var q in result["questions"]?.AsArray() ?? new JsonArray()) Console.WriteLine($"question {q}");

What the page does that you now do

• Reads the paste in the browser and builds code and facts from it (kotkit.js), joining dropped files under // file: lines (# file: for a .toml version catalog) and cutting a large paste on whole files with a // [coroutine-desk: not sent: ...] line; you send the same two strings.
• Prices every input with /estimate and refuses to run below min_credits, or on a paste with no Kotlin it can read.
• Sends each attempt with an input- and lane-derived Idempotency-Key, and retries once with retry_note when a reply does not parse.
• Closes a cut-off JSON reply and shows what arrived when truncated is true or the stream ends early.
• Hands an audit to the fix lane as audit_handoff, with every edit applied to the paste first, and only while that edited paste is unchanged.
• Checks the reply against the code (recon.js), in the browser: files, lines, evidence, every edit applied in order and the free check re-run after each finding, flag answers and verdict; the fixed files put back, re-checked and matched against the changes list and the open items, with every fun still there and still suspend or not; and repeated credentials. recheck.js above runs the same checks for you.

Or skip all of this and use Coroutine Desk in the browser: the check, the flags, the coroutine-builder, blocking-call, catch, flow and collect inventories, putting an edit or the fixed files back into the paste, and the Markdown and CSV exports are free.