# X_AGENT_TOOL_LOOP

## Means

an agent repeated one tool call with one result and was stopped

## Typical cause

an agent() asked for the same tool calls with the same arguments and read the same results on consecutive turns — or went round a cycle of 2 or 3 such turns — so no later turn can differ. Stopped at maxRepeatedToolCalls (default 3) laps instead of spending every remaining turn re-sending a growing transcript for the same non-answer. Terminal: a job does not retry it

## Fix

`maxRepeatedToolCalls: 5` — on the agent, only for a tool that is polled and answers identically while it waits; otherwise tell the template what to do when a tool result does not change, then bump its version

[MCP and AI](/error-codes#mcp-and-ai)