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FabledScribe/tests
bvandeusenandClaude Opus 5.5 5c6d9a7b55
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fix(mcp): a tool's refusal reaches the agent with its reason (#4794)
SDK 2.x passes on only a ToolError's text. Any other exception becomes
UnexpectedToolError("Error executing tool X") and its message stays on the
server. ValueError is how every Scribe tool refuses — what was refused, why,
what to do instead — so every refusal reached the agent bare, and it could
only retry blind. Seen live: tune_retrieval(actor="operator") and
judge_menu(verdicts=[]) both answered "Error executing tool …" and nothing
else.

StrictArgsMCPServer.call_tool re-raises an UnexpectedToolError caused by a
ValueError as a ToolError carrying the message, in the SDK's own
"Error executing tool X: <reason>" shape. Other exceptions are crashes and
stay masked. The stale comment claiming the SDK returns ValueError text is
corrected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-03 21:31:10 -04:00
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