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fix: record JSON-RPC errors on client OpenTelemetry spans by mikemikimike · Pull Request #3401 · modelcontextprotocol/python-sdk · GitHub

fix: record JSON-RPC errors on client OpenTelemetry spans - #3401

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modelcontextprotocol:mainfrom
mikemikimike:codex/fix-client-otel-errors-3174
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fix: record JSON-RPC errors on client OpenTelemetry spans#3401
mikemikimike wants to merge 1 commit into
modelcontextprotocol:mainfrom
mikemikimike:codex/fix-client-otel-errors-3174

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Summary

Client OpenTelemetry spans did not record JSON-RPC error responses because ErrorData was converted to MCPError after the span context exited. This made failed client requests indistinguishable from successful requests in telemetry.

This change records StatusCode.ERROR, error.type, and rpc.response.status_code while the client span is still active. The existing MCPError behavior is unchanged.

Tests

  • uv run --frozen pytest tests/server/test_otel.py -q (17 passed)
  • uv run --frozen ruff check src/mcp/shared/jsonrpc_dispatcher.py tests/server/test_otel.py
  • uv run --frozen ruff format --check src/mcp/shared/jsonrpc_dispatcher.py tests/server/test_otel.py
  • uv run --frozen pyright src/mcp/shared/jsonrpc_dispatcher.py tests/server/test_otel.py
  • Full suite with PYTHONUTF8=1: 5574 passed, 16 skipped, 1 xfailed; one unrelated local HTTP 502 failure in tests/client/test_transport_stream_cleanup.py::test_sse_client_closes_all_streams_on_connection_error.

AI assistance was used during development, and the change was reviewed and verified locally.

Fixes #3174

github-actions Bot added the missing-issue-link Auto-closed: PR needs a linked issue assigned to its author (see CONTRIBUTING.md) label Aug 27, 2026

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This PR has been closed automatically. This repo only keeps pull requests open when they come from a maintainer, or from a contributor a maintainer has assigned to the linked issue, and you aren't currently assigned to #3174.

If a maintainer assigns you to #3174, this PR reopens on its own and there's nothing more you need to do here. Assignment is a maintainer call based on capacity; comments that only ask to be assigned don't factor in. What does help is engaging on the issue itself by confirming the repro, explaining why it matters for your use case, or describing the approach you'd take.

You're welcome to keep pushing commits here (just avoid force-pushing, since GitHub can't reopen a rewritten branch), but that on its own won't get the PR reviewed or the issue assigned, and realistically most auto-closed PRs stay closed. There's no need to open a new PR either way.

CONTRIBUTING.md has the full reasoning, but in short:

  • We're a small team with very little capacity to review community PRs right now.
  • Many recent PRs are AI-generated with little human review, and reviewing one carefully still costs a maintainer as much time as it ever did. A well-described issue is usually more useful to us than the code.

Maintainers: reopen, remove missing-issue-link, or add bypass-issue-check to override.

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[v2] JSON-RPC error responses leave client OpenTelemetry spans UNSET

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