long_running_tasks

Handling Long-Running Processes in Cursor

To avoid connection failed or timeout errors during long-running operations like performance tests, builds, or complex tool calls, follow these guidelines.

1. Acknowledge Cursor's Timeout Limits

• Fixed Timeouts: Cursor imposes a non-configurable timeout on tool calls and other background processes initiated from chat. This can be as short as 5 seconds.
• No User Control: There is currently no setting to extend this timeout.

2. Best Practices for Long-Running Tasks

• Break Down Tasks: Sub-divide long processes into smaller chunks.

  • Target Duration: Aim for each chunk to complete in under 5 seconds to be safe.
  • Example (Artillery): Instead of one long test, run multiple short tests targeting specific phases or scenarios.

• Kill Previous Processes: Before starting a new instance of a server or long-running task, always ensure the previous one is terminated to avoid port conflicts (EADDRINUSE).

  • Command: Use kill $(lsof -t -i:<port>) 2>/dev/null || true to gracefully kill any process on a given port.

• Execute Externally (If Necessary): For tasks that cannot be broken down (e.g., a full production build), the best practice is to run them in a separate, dedicated terminal outside of the agent's control and then report the results back.

• Provide Feedback: Continue to report when timeouts occur, as this helps refine our internal best practices and provides data for potential future feature requests to the Cursor team.

3. Primary Strategy: Decompose and Conquer

• Break Down Tasks: The most effective strategy is to break down long-running commands into smaller, incremental steps that can each complete within the timeout window.
• Example (Artillery): Instead of running a full 10-minute test suite, run a single, short scenario first to verify configuration. Then, run shorter phases of the test separately.

  # Instead of this:
  npx artillery run long-test-suite.yml
  
  # Do this:
  # Step 1: Verify a single scenario
  npx artillery run --scenario "Quick Smoke Test" test-suite.yml
  
  # Step 2: Run a shorter phase
  npx artillery run --phase "Warm-up" test-suite.yml
  

• Example (Builds/Tests): Instead of running npm test, run tests for a specific file or component: jest src/components/MyComponent.test.ts.