Skip to content

fix(mcp): MCP Instrumentation: streamablehttp_client Parameter Corruption #3199

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Aug 13, 2025
Merged

fix(mcp): MCP Instrumentation: streamablehttp_client Parameter Corruption #3199

Changes from 2 commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
baef8ef
fix: streamable http mcp params
feng-95 Jul 28, 2025
2226fd7
feat: explicit type annotation
feng-95 Aug 4, 2025
8af7327
Merge branch 'main' into main
nirga Aug 13, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
26 changes: 20 additions & 6 deletions ...es/opentelemetry-instrumentation-mcp/opentelemetry/instrumentation/mcp/instrumentation.py
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
from contextlib import asynccontextmanager
from dataclasses import dataclass
from typing import Any, AsyncGenerator, Callable, Collection, Tuple, cast
from typing import Any, AsyncGenerator, Callable, Collection, Tuple, cast, Union
import json
import logging
import traceback
Expand Down Expand Up @@ -125,16 +125,30 @@ def _transport_wrapper(self, tracer):
async def traced_method(
wrapped: Callable[..., Any], instance: Any, args: Any, kwargs: Any
) -> AsyncGenerator[
Tuple["InstrumentedStreamReader", "InstrumentedStreamWriter"], None
Union[
Tuple[InstrumentedStreamReader, InstrumentedStreamWriter],
Tuple[InstrumentedStreamReader, InstrumentedStreamWriter, Any]
],
None
]:
async with wrapped(*args, **kwargs) as result:
try:
read_stream, write_stream = result
yield InstrumentedStreamReader(
read_stream, tracer
), InstrumentedStreamWriter(write_stream, tracer)
except ValueError:
read_stream, write_stream, _ = result
yield InstrumentedStreamReader(
read_stream, tracer
), InstrumentedStreamWriter(write_stream, tracer)
try:
read_stream, write_stream, get_session_id_callback = result
yield InstrumentedStreamReader(
read_stream, tracer
), InstrumentedStreamWriter(write_stream, tracer), get_session_id_callback
except Exception as e:
logging.warning(f"mcp instrumentation _transport_wrapper exception: {e}")
yield result
except Exception as e:
logging.warning(f"mcp instrumentation transport_wrapper exception: {e}")
yield result

return traced_method

Expand Down