AI BriefingVercel introduces durable-harness to make coding agents crash-resistant
·2026.10.19 09:00
Key point
The open-source package extends durability to Pi, OpenCode, Codex, and Claude Code by logging every step to a durable backend, ensuring agents resume from the exact point of failure without repeating completed model calls.
Details
- Vercel released durable-harness, an open-source package that adds crash resistance to existing coding agent harnesses like Pi, OpenCode, Codex, and Claude Code.
- The system uses the Workflow SDK's World interface to write each step of an agent turn to a durable log, allowing new functions to resume interrupted work from the log after a crash or timeout.
- Completed model and tool calls are never re-executed, preventing duplicate billing and ensuring models remember previous calls rather than repeating them.
- The package supports running on Vercel, self-hosting with Postgres, MongoDB, Redis, or Turso, and local development with file-based logs.
- It provides three workspace options: virtual() for in-log files, virtual({ durable: false }) for in-memory scratch work, and sandbox() for persistent Vercel Sandbox environments.
- Tools can be marked as 'safe' to allow automatic re-execution or 'never' to prevent double-execution of side effects like posting comments or processing refunds.
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