Solving Mid-Task Agent Failures: Open-Source Tool for Automatic Rollbacks
Hour-Bite8746 · reddit · 2026-07-31
Developers building multi-tool agent chains often face the issue of inconsistent states in databases or payment systems when a step fails midway. To solve this, the author open-sourced a small library called agent-undo.
The core mechanism wraps tools with an undo handler. If a step in the chain fails, the previously successful steps are automatically rolled back in reverse order, acting like a transaction.
Key Features:
- Core saga engine with LIFO rollback.
- Adapters for Vercel AI SDK and Mastra.
- Includes an MCP server, allowing clients like Claude Code to run and roll back sagas via plain tool calls.
- 68 passing TypeScript tests.
Current Limitations:
- No persistence yet; if the process crashes entirely, the rollback stack is lost (coming next).
- No dashboard; developers currently read saga.status and saga.steps directly.
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