Oliver Kieselbach afa8750cbb feat(mcp): tool-call quality telemetry — soft errors, result size, zero-hit searches, arg rejections ...

withToolTelemetry now receives the tool args and inspects the RESULT: handlers
never throw (toolError returns isError:true), so the previous isError flag was
effectively always false. Each MCP_TOOL_LOGGING line now carries soft-error
status, resultChars + overCap (vs. the anthropic/maxResultSizeChars hint),
a size-bounded args summary and the caller scope — the only telemetry that
covers backend-free tools (search_docs, validate_rule, get_resource).

New signals: search_zero_hit on the three search tools (unmet-demand signal)
and tool_call_rejected for JSON-RPC-level Zod/unknown-tool rejections, sniffed
at the /mcp route since the SDK answers those before any handler runs.

Bicep default toolLoggingEnabled=true (desired state; live flag via
az containerapp update). Docs: docs/mcp/tool-telemetry.md with KQL examples.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-08-05 19:16:35 +02:00

..

mcp-server.bicep

feat(mcp): tool-call quality telemetry — soft errors, result size, zero-hit searches, arg rejections

2026-08-05 19:16:35 +02:00