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Ran 16 Apr 2026 10:19PM UTC

Files 287

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Committed 16 Apr 2026 10:07PM UTC coverage: 64.249% (-0.02%) from 64.272%

Job # 24536510404.1

Build Type

push

github

Committed by

web-flow

Commit Message

feat(llm, mcp): Forward tool and MCP server stderr to tracing (#573)

Tool commands and MCP server processes previously discarded their stderr
output entirely, making it impossible to diagnose failures without
attaching a debugger or wrapping the binary.

Both outputs are now piped and forwarded line-by-line to tracing using
byte-level readers, so non-UTF-8 output doesn't terminate the forwarder.
Tool command stderr is tagged with the invocation's id and name and
emitted under `tool::stderr`; MCP server stderr is tagged with the
server id and emitted under `mcp::stderr`. Users can opt in selectively,
e.g.:

    jp --log=mcp::stderr=trace query "..."
    jp --log=tool::stderr=trace query "..."

To support optional forwarding, `run_tool_command` gains a new
`trace_as: Option<ToolTrace<'_>>` parameter. Passing `None` disables
forwarding (used for argument-formatting invocations where stderr is not
meaningful). `ToolTrace` is also re-exported from `jp_llm`.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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