不做了睡大觉 2780ae2892 fix: temp-scoped state now visible to subsequent agents in same invocation ...

Merge https://github.com/google/adk-python/pull/4618

## Summary

Fixes #4564

When using `output_key` with a `temp:` prefix (e.g. `output_key='temp:result'`) in a `SequentialAgent`, the output was silently lost. Agent-2 could never read the temp state written by agent-1.

## Root Cause

Two issues in `append_event`:

1. `_trim_temp_delta_state()` removed temp keys from the event delta **before** `_update_session_state()` could apply them to the in-memory session
2. `_update_session_state()` also explicitly skipped `temp:`-prefixed keys

```python
# Before (broken ordering):
async def append_event(self, session, event):
    event = self._trim_temp_delta_state(event)   # temp keys gone!
    self._update_session_state(session, event)    # nothing to apply
```

## Fix

Introduce `_apply_temp_state()` which writes temp-scoped keys to the in-memory `session.state` **before** the event delta is trimmed:

```python
# After:
async def append_event(self, session, event):
    self._apply_temp_state(session, event)        # temp keys → session.state
    event = self._trim_temp_delta_state(event)    # temp keys removed from delta
    self._update_session_state(session, event)    # non-temp keys applied
```

This ensures:
- ✅ Temp state is available to subsequent agents within the same invocation
- ✅ Temp state is still stripped from event deltas (not persisted to storage)
- ✅ All three session services (InMemory, Database, SQLite) behave consistently

## Files Changed

- `src/google/adk/sessions/base_session_service.py`: Added `_apply_temp_state()`, reordered `append_event` logic, removed temp-skip in `_update_session_state`
- `src/google/adk/sessions/database_session_service.py`: Added `_apply_temp_state()` call before trim
- `src/google/adk/sessions/sqlite_session_service.py`: Added `_apply_temp_state()` call before trim
- `tests/unittests/sessions/test_session_service.py`: Updated existing test + added new test for sequential agent scenario

## Testing

All 67 session service tests pass across InMemory, Database, and SQLite backends.

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/4618 from stakeswky:fix/temp-state-output-key b9fc737e7a6dc07e06e99af3271a8fc026acae4a
PiperOrigin-RevId: 878499263

2026-03-04 08:15:43 -08:00

..

integration

fix: propagate grounding and citation metadata in streaming responses

2026-02-10 14:36:21 -08:00

unittests

fix: temp-scoped state now visible to subsequent agents in same invocation

2026-03-04 08:15:43 -08:00

__init__.py

chore: Upgrade to headers to 2026

2026-01-20 14:50:09 -08:00