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Title: Add basic OpenTelemetry tracing for client and server requests by Kludex · Pull Request #2381 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Add basic OpenTelemetry tracing for client and server requests by Kludex · Pull Request #2381 · modelcontextprotocol/python-sdk

X Title: Add basic OpenTelemetry tracing for client and server requests by Kludex · Pull Request #2381 · modelcontextprotocol/python-sdk

Description: Summary Adds OpenTelemetry tracing to MCP client and server request handling, with W3C trace context propagation via _meta per SEP-414. opentelemetry-api is added as a mandatory dependency. It provides a no-op tracer by default - spans are only recorded when the user configures an OTel SDK (e.g. via Logfire, Jaeger, OTLP exporters). Spans Client (send_request): MCP send tools/call my_tool with SpanKind.CLIENT Server (_handle_request): MCP handle tools/call my_tool with SpanKind.SERVER Server spans record ERROR status when the handler returns ErrorData. Client spans record errors automatically via OTel's start_as_current_span when MCPError propagates. Trace context propagation (SEP-414) On send, traceparent/tracestate are injected into _meta of the JSON-RPC request. On the server side, _meta is extracted and used as the parent context for the handler span. This enables cross-process trace propagation over stdio and HTTP transports. Attributes mcp.method.name - the JSON-RPC method (e.g. tools/call) jsonrpc.request.id - the request ID New files src/mcp/shared/_otel.py - OTel helpers (otel_span, inject_trace_context, extract_trace_context) tests/shared/test_otel.py - E2E test verifying span names, kinds, attributes, and trace propagation Test plan E2E test: client calls a tool, verifies both client and server spans with correct names, kinds, attributes, and same trace ID All existing tests pass 100% coverage

Open Graph Description: Summary Adds OpenTelemetry tracing to MCP client and server request handling, with W3C trace context propagation via _meta per SEP-414. opentelemetry-api is added as a mandatory dependency. It prov...

X Description: Summary Adds OpenTelemetry tracing to MCP client and server request handling, with W3C trace context propagation via _meta per SEP-414. opentelemetry-api is added as a mandatory dependency. It prov...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2381

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bbdd99b Add basic OpenTelemetry tracing for client and server requests Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/bbdd99bf9c347038238db56d9223a248eef98900
e1ebbc7 Make opentelemetry-api a mandatory dependency Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/e1ebbc7e5944523e93f68adfbcef4d037c6fda6c
7795f34 Use logfire[testing] for OTel test assertions Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/7795f34ec6afa4ca01a0721bf2ed49121cfd624e
e2d4b03 Use 'MCP send' prefix for outgoing request spans Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/e2d4b03e4cd9aebbcd159cf63b75fc979579f093
0e0b746 Propagate W3C trace context via _meta per SEP-414 Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/0e0b746b0cc203b66aec137ae00fd02f46e56caa
54f8787 Address review feedback on type annotations and _meta injection Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/54f87874d2e8731567b7e44b5f44b1376231542d
a700ab9 Merge branch 'main' into marcelo/otel-spans Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/a700ab91dd5ffbc41c90d262ac5389114e24a22c
2369988 Skip OTel test when logfire.testing is not available Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/2369988904570ffc2af8e0d1a90478c9118c5aef
f43dc4a Merge branch 'marcelo/otel-spans' of github.com:modelcontextprotocol/… Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/f43dc4a86da5ac993530caf8f75b5e949e58c0a8
0391854 Pin logfire>=3.0.0 dev dependency and restore direct import Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/03918548d8b84515af22c600528bc9541af66c2d
1ee1dfd Use single backticks in docstrings Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/1ee1dfd9a60b3e75deb1cd445f76a3e59fce69c7
d9dcc85 Record ERROR status on server spans for error responses Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/d9dcc85b5bda9c74e3d1f1d9e90ea0c84675a1e0
f79767e Move StatusCode import to top of file Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/f79767e3221c97fea2a5a23f67184907b7b76459
8ae416e Use SpanKind enum directly instead of string conversion Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/8ae416e9bfa0b9a701f427b693c42d89435b8c89
b47c9c5 Add comment explaining filterwarnings on OTel test Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/b47c9c5cf91ba232290a403227104fe444ee9a0b
e00d336 Use isinstance assert instead of type: ignore in OTel test Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2381/commits/e00d336ee6cc26ac2dd08ca7eec4e2e7dd8ef89b
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