Symptom

Each tool call fails with 'Field required ... input_value={}' and the agent repeats until max iterations.

Evidence what you'll see

Only happens with one cloud provider's native tool-calling format
The raw model response does contain the arguments, under an 'input' field

Cause

The native tool-call parser reads arguments only from the field other providers use, so arguments sent under 'input' are replaced with {}.

Fix steps

0 of 3 done

Step 1Log the raw tool call from the model and compare it with what the tool receives.
Step 2Upgrade and check whether the parser now reads the 'input' field.
Step 3Add a small contract test for each tool-call shape you rely on, checking the tool name, arguments and id before validation.

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Verify the fix worked

A tool with required arguments receives them and returns a result on the first try.

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Sources and credit

Summarized in our own words from these public reports. Credit goes to their authors.

crewAI issue #4972 ↗

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