task tool "SyntaxError: Unexpected end of JSON input"

Since a few days, especially using grok-code and code-supernova, task runs seem to constantly fail with JSON Input Errors, basically degrading them entirely when trying to call other agents.

This was working better already.

I am not sure, where they do it wrong. Occasionally, they succeed. But most task calls now fail with this problem.

This issue might be a duplicate of existing issues. Please check:

JSON parsing failed: Text #2188: JSON parsing failed with similar 'Expected }' error message - involved tool arguments with invalid JSON format
Single quotes (') are not allowed in JSON #1264: Single quotes (') are not allowed in JSON - shows JSON Parse errors with tool calls from certain models
JSON Parse error: Unterminated string with openrouter/kimi-k2 #1278: JSON Parse error: Unterminated string with openrouter/kimi-k2 - demonstrates JSON parsing failures in tool calls

Feel free to ignore if none of these address your specific case.

believe this is model failing to call tool properly

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task tool "SyntaxError: Unexpected end of JSON input" #3034

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task tool "SyntaxError: Unexpected end of JSON input" #3034

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github-actions commented on Oct 8, 2025

rekram1-node commented on Oct 8, 2025

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