Vercel launches durable-harness for resilient coding agents

durable-harness targets the biggest weakness in autonomous coding agents: losing hours of progress when a process dies. Its strongest idea is separating durability from the harness itself, though external side effects still require careful idempotency design.

• –Durable logs record call intent and outcomes, allowing interrupted turns to continue without repeating completed work.
• –Adapters let developers keep their preferred coding agent while adding the same persistence layer underneath.
• –The Workflow SDK’s World interface supports local development, managed Vercel deployments, and Postgres-based self-hosting.
• –Agent Runs exposes resumed sessions in the same trace, making failures and recovery easier to inspect.
• –The project is experimental 0.0.x software, so teams should expect API churn before making it production-critical.