OpenRouter explains four guards against AI agent loops
Overview
OpenRouter's blog publishes a guide on stopping AI agents that get stuck retrying a failing tool call, which the company says can cost thousands of dollars.
OpenRouter says it tested the four guards on six current models. Three run through its Agent SDK (@openrouter/agent 0.11.0): doom-loop detection, a rule defining which calls count as repeats, and step and cost caps. The fourth is a credit limit on the API key, enforced by OpenRouter so it holds even if the agent code has a bug.
For keys that use BYOK, the guide says include_byok_in_limit must be set to true, since it defaults to false and BYOK spend otherwise does not count toward the limit. If a request is larger than the key's remaining balance, the request fails and is not charged.
Written by AI from the articles below · updated Nov 11, 7:33 PM ET
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The articles in this story. Times are ET.
- OpenRouter BlogOfficialOpenRouter explains four guards that stop AI agents looping on failing tools
AIOpenRouter says an AI agent stuck retrying a failing tool call can rack up thousands of dollars, and its guide stops the loop with four guards tested on six models. Three run through the OpenRouter Agent SDK (@openrouter/agent 0.11.0): doom-loop detection, a rule for which calls count as repeats, and step and cost caps. The fourth is a credit limit on the API key, which OpenRouter enforces on its side so it holds even if agent code has a bug.
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