Claude Code enforces outputSchema must have type: object at root, but FastMCP
generates schemas with $ref for self-referential Pydantic models like Issue.
Adds output_schema=None to 8 tools returning complex models:
ready, list, show, create, update, close, reopen, blocked
This disables structured output schema generation, allowing Claude Code to
call these tools without validation errors.
Related: https://github.com/modelcontextprotocol/inspector/issues/552🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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