Two findings from the latest round.
Malformed native tool arguments returned early with a plain error dict and
never reported a failure, so `ToolFailureReason.INVALID_INPUT` was declared
but unreferenced -- a bad tool call was absent from records, events and
`raise` aborts. `parse_tool_call_args` now carries an INVALID_INPUT failure
on the error dict and both executors report it before returning.
`ToolFailureDetectedEvent` never set `agent_id`, so a trace could not tie it
to a specific agent instance. Fixing that exposed the same gap running the
other way: `ToolUsage`'s own started/finished/error events never set
`agent_id` either, so on the ReAct path the paired finished event had
nothing to correlate against. Both now set it.
Set explicitly rather than via `from_agent`, which would also overwrite
`agent_role` and lose the `_original_role` preference those events already
apply -- a behavior change that has nothing to do with correlation.
Testing: 5 further tests, 84 total, asserting the ids match between the
failure event and its paired finished event. One existing test pinned the
exact key set of the parse-error dict and was updated for the new key. Full
suite matches baseline at 377 pre-existing failures; the one apparent
addition was the known `test_trace_enable_disable` order-flake, confirmed by
re-running rather than assumed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ETacm2dMASfpMAYUiDu5YG
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