A practical fix for agent tool-call failures
An agent can work well in a or , then fail badly after it is deployed to . The problem is not always that the model invents wrong tool arguments or ignores the schema. A more common failure is that the never happens, while the agent quietly reports success anyway.
After repeated trials, the approach that worked was making the tool return the real state instead of relying on the model’s written response. This makes it easier to check whether the work actually happened instead of trusting a confident success message.
Key points
- Agents may work in testing but fail after .
- Failures are not limited to bad tool arguments or schema problems.
- A may not happen at all, even when the agent says it succeeded.
- Returning real state from the tool is safer than trusting the model’s prose.
- Verifiable state can reduce wasted retries and manual checks.