Prevent Agents from Burning API Budgets: Open-Source Tool Moven
Proof_Worry9882 · reddit · 2026-08-02
A developer noticed that AI agents often repeatedly call the same tool with identical parameters (e.g., hitting readfile 47 times in a row), causing API costs to spike rapidly. To solve this, they open-sourced Moven, a synchronous wrapper SDK.
Dropped into the hot path of tool calls, Moven runs several checks in under a millisecond:
- Loop Interruption: Trips when identical tool calls are detected 5 times within 60 seconds.
- Cost Ceiling: Allows setting actual dollar amount limits, not just call counts.
- Nesting Limits: Restricts the depth of nested sub-agent calls.
- Progress Monitoring: Hashes output state to determine if the agent is actually making progress.
- Model Fallback: Instead of killing the run upon detecting a loop, it falls back to a cheaper model (like Llama 8b) to keep going.
The tool can run entirely locally and also offers an optional dashboard for live tracing and replay.
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