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AI agent self-delegation bug highlights undocumented optional parameters

A coordinator agent experienced an issue where it repeatedly delegated tasks to itself. This occurred because the delegation tool's `agentId` parameter was marked as optional and lacked a description, leading the AI model to fill in all described parameters while omitting the undocumented optional one. The absence of runtime validation for this optional field allowed the self-delegation loop to initiate. AI

IMPACT Highlights the critical need for precise tool schemas and documentation in multi-agent systems to prevent unexpected behavior and ensure reliable operation.

RANK_REASON This item describes a specific bug in an AI agent's behavior due to a poorly defined tool schema, which is not a significant industry event.

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AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

AI agent self-delegation bug highlights undocumented optional parameters

COVERAGE [1]

  1. Mastodon — sigmoid.social TIER_1 English(EN) · [email protected] ·

    Our coordinator agent kept delegating jobs to itself. Cause: the delegation tool declares `agentId` optional — and with no description. The model fills in every

    Our coordinator agent kept delegating jobs to itself. Cause: the delegation tool declares `agentId` optional — and with no description. The model fills in every parameter that was explained and omits the one that wasn't. Optional means the runtime doesn't complain: it spawns you.…