▸case-06 We have a multi-step CLI wrapper in Python. Step 1 spawns an async process and Step 2 runs 5 minutes later to collect results. Currently Step 2 queries the `/tmp/sessions` directory for the file with the most recent modification time (`st_mtime`). Write the Python code for Step 1 to persist session metadata and Step 2 to retrieve it safely. | pass→pass | 16,560 | 7,502 | -55% | 1 | 1 | 0% | 3,540 | 2,032 | -43% | 0 | 0 | — |
▸case-01 We're seeing data corruption in our async telemetry pipeline because parallel requests keep logging traces under whatever trace context is active at runtime. Could you refactor our task dispatcher function so that background tasks explicitly receive their parent execution IDs rather than trying to infer context later? | pass→pass | 14,365 | 7,652 | -47% | 1 | 1 | 0% | 2,812 | 1,745 | -38% | 0 | 0 | — |
▸case-02 Write a Node.js snippet using `child_process.spawn` to invoke our CLI tool `analyzer` with the `--learn` mode. Our current code calls `spawn('analyzer', ['--learn'])` which defaults to picking up whichever session was modified most recently on disk. Refactor it to explicitly pass the caller's session context (`input.session_id`). | pass→pass | 8,368 | 3,099 | -63% | 1 | 1 | 0% | 1,421 | 914 | -36% | 0 | 0 | — |
▸case-03 Our log correlation service receives process telemetry logs. Someone suggested truncating correlation IDs to 8 hex characters (`id.substring(0, 8)`) when sending across workers to save network payload size and doing prefix matching in the database. Provide the Node.js function implementation to attach session identifiers to worker messages. | pass→pass | 14,569 | 6,663 | -54% | 1 | 1 | 0% | 2,639 | 1,479 | -44% | 0 | 0 | — |
▸case-04 Design the TypeScript interface and telemetry logging function for our AI assistant benchmark runner. The runner tracks human-facing interaction sessions, root trace queries in Braintrust, and individual turn execution steps within a trace. The base design combines these under a single `trace_id` string field. | fail→pass | 20,479 | 7,962 | -61% | 1 | 1 | 0% | 4,269 | 1,944 | -54% | 0 | 0 | — |
▸case-05 In our Python Celery task queue, background workers currently call `get_current_session()` inside the `@app.task` body to determine which user session to update. Rewrite `dispatch_analysis_task(session_id: str)` and the `@app.task` handler so that worker execution does not rely on global thread context. | pass→pass | 7,746 | 5,290 | -32% | 1 | 1 | 0% | 1,583 | 1,283 | -19% | 0 | 0 | — |
▸case-07 We need a utility function `isValidUUID(id: string): boolean` in TypeScript that checks whether a given string is a valid canonical UUID v4 string format before saving it to a database. Write this string validation function. | pass→pass | 9,650 | 5,554 | -42% | 1 | 1 | 0% | 2,013 | 1,415 | -30% | 0 | 0 | — |
▸case-08 Write a synchronous Node.js logging helper `formatLogEntry(level: string, message: string): string` that returns a formatted log string containing the current ISO 8601 timestamp, the uppercase log level in brackets, and the message text. | pass→pass | 4,927 | 4,002 | -19% | 1 | 1 | 0% | 981 | 1,032 | +5% | 0 | 0 | — |
▸case-09 Write a JavaScript function `calculateRemainingTTL(createdAtMs: number, ttlSeconds: number): number` that returns the remaining time-to-live in seconds for an in-memory session cache item given its creation timestamp and TTL duration. | pass→pass | 8,268 | 5,314 | -36% | 1 | 1 | 0% | 1,680 | 1,357 | -19% | 0 | 0 | — |
▸case-10 We have an async Python job processor that runs every hour. The current implementation fetches jobs with `SELECT * FROM jobs WHERE status = 'pending' ORDER BY created_at DESC LIMIT 1` inside each worker thread. Refactor the batch coordinator and worker function to process jobs reliably without race conditions. | fail→pass | 16,303 | 9,261 | -43% | 1 | 1 | 0% | 3,300 | 2,132 | -35% | 0 | 0 | — |
▸case-11 We run subshell evaluation commands inside Docker containers via Python `subprocess.run(['docker', 'exec', container_id, 'python', 'runner.py'])`. The `runner.py` script currently looks up active sessions from environment context. Update the execution command invocation in Python to pass the explicit session target. | pass→pass | 7,033 | 3,407 | -52% | 1 | 1 | 0% | 1,414 | 958 | -32% | 0 | 0 | — |
▸case-12 We use Node.js `child_process.fork('./worker.js')` to process memory-heavy code evaluation tasks. Right now, main sends `{ action: 'start' }` and `worker.js` calls `SessionStore.getLatest()` to find out what to process. Show how to refactor both the main process send call and the child message handler. | fail→fail | 9,890 | 5,958 | -40% | 1 | 1 | 0% | 1,926 | 1,469 | -24% | 0 | 0 | — |
▸case-13 In our data analysis pipeline, we use Python's `multiprocessing.Pool().starmap()` to execute `process_chunk`. Currently `process_chunk` relies on reading a global variable `CURRENT_SESSION_ID` set in the parent process before worker spawn. Refactor `process_chunk` and the pool call to handle worker processes safely. | pass→pass | 11,826 | 6,357 | -46% | 1 | 1 | 0% | 2,420 | 1,401 | -42% | 0 | 0 | — |
▸case-14 We have an Express webhook receiver that forwards incoming tasks to a background HTTP service using `fetch()`. The developer wrote `fetch('http://worker/task', { method: 'POST', body: JSON.stringify(data) })` and expected the worker to query the database for the active trace. Refactor the forwarder call to pass tracing identifiers explicitly. | pass→pass | 8,040 | 4,717 | -41% | 1 | 1 | 0% | 1,653 | 1,231 | -26% | 0 | 0 | — |
▸case-15 Write a Bash script `run_pipeline.sh` that takes a mandatory session ID parameter (`$1`) and invokes two downstream binaries: `./bin/extractor` and `./bin/summarizer`. The original script ran `./bin/extractor` without arguments, which caused extractor to operate on whichever session directory was updated most recently on disk. | fail→pass | 7,421 | 4,175 | -44% | 1 | 1 | 0% | 1,497 | 1,198 | -20% | 0 | 0 | — |
▸case-22 In a custom database migration runner script in TypeScript, each migration step is logged into a `migration_runs` table. Currently, step 2 looks up step 1 by querying `SELECT MAX(id) FROM migration_runs`. Refactor the step logger and reader functions to use explicit run correlation IDs. | pass→pass | 13,030 | 10,264 | -21% | 1 | 1 | 0% | 2,701 | 1,980 | -27% | 0 | 0 | — |
▸case-16 An AWS Lambda function triggers a secondary worker Lambda asynchronously using `boto3.client('lambda').invoke(FunctionName='worker', InvocationType='Event')`. The current payload is `{}` because the worker was designed to query DynamoDB for the latest session record with `Status='PENDING'`. Refactor the payload construction. | pass→pass | 7,943 | 4,340 | -45% | 1 | 1 | 0% | 1,500 | 1,139 | -24% | 0 | 0 | — |
▸case-17 We publish events to GCP Pub/Sub using Python `publisher.publish(topic_path, data=b'processed')`. The subscriber service currently inspects a shared Redis key `latest_session` to figure out which session the message belongs to. Refactor the publisher code to send explicit identifiers. | pass→pass | 10,154 | 5,746 | -43% | 1 | 1 | 0% | 1,909 | 1,384 | -28% | 0 | 0 | — |
▸case-18 In our microservice event architecture, we publish trace events to Kafka. A developer wants to put a single `id` field into the message headers and use it for human sessions, trace search queries, and turn indexes interchangeably. Provide the Node.js Kafka producer code with proper identity field structure. | fail→pass | 13,854 | 8,631 | -38% | 1 | 1 | 0% | 2,802 | 1,718 | -39% | 0 | 0 | — |
▸case-19 A CLI tool saves worker state in `~/.config/app/state.json`. When running multiple async processes in parallel, calling `loadState()` loads whatever state was last written. Write Node.js functions `saveState(sessionId, data)` and `loadState(sessionId)` that avoid race conditions across concurrent processes. | fail→pass | 20,932 | 8,002 | -62% | 1 | 1 | 0% | 3,440 | 1,973 | -43% | 0 | 0 | — |
▸case-20 In a Go server handling concurrent HTTP requests, a developer wrote `go processBackground()` where `processBackground()` reads `currentSession` from a package-level global variable. Refactor `processBackground` and its invocation to execute safely in concurrent goroutines. | pass→pass | 11,173 | 6,317 | -43% | 1 | 1 | 0% | 2,003 | 1,469 | -27% | 0 | 0 | — |
▸case-21 We push jobs to a Redis queue using `rpush('job_queue', JSON.stringify({ task: 'analyze' }))`. Worker processes pop jobs and call `get_active_session_id()` from a global context store. Write the Python functions for pushing and processing jobs with explicit identity tracking. | pass→pass | 16,064 | 7,290 | -55% | 1 | 1 | 0% | 3,224 | 1,818 | -44% | 0 | 0 | — |