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Switch default Gemini model to gemini-3.5-flash; de-flake Gemini tests - #105

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GuanyiLi-Craig merged 1 commit into
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fix/gemini-default-model-3.5-flash
Jun 23, 2026
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Switch default Gemini model to gemini-3.5-flash; de-flake Gemini tests#105
GuanyiLi-Craig merged 1 commit into
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fix/gemini-default-model-3.5-flash

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Why

The 0.0.36 release is blocked: CI's simple_llm_assistant and function_call_assistant integration jobs fail, which gates the PyPI publish. Both jobs are the only ones that exercise Gemini.

Root cause is two-fold:

  1. gemini-2.5-flash-lite (the old default) is under a sustained Google-side 503 UNAVAILABLE "high demand" outage, intermittently failing the Gemini tests.
  2. The Gemini integration tests assert that a literal keyword appears in the model's free-form response ("Grafi" in content, "weather" in content). These only passed because 2.5-flash-lite happened to phrase responses a certain way. Any other model phrases differently and intermittently fails them — so a model switch alone doesn't fix it.

What

  • Default model → gemini-3.5-flash (gemini_tool.py), which is stably available. Updated the deserialize fallback and the docstring comment (lite/pro alternatives) to match.
  • De-flaked the Gemini integration tests: replaced the phrasing-dependent keyword checks with phrasing-independent non-empty-response assertions. Retained the meaningful checks — assistant role, response length bounds (< 300), and exact event counts (== 2 / == 4 / == 24), which validate the tool was actually invoked and the workflow ran end-to-end.
  • Updated unit-test fixtures/expectations to the new model string.
  • Synced uv.lock to 0.0.36 (left stale by the version-bump PR Bump version to 0.0.36 to trigger PyPI publish #103).

Validation

  • gemini_tool_example.py: 10/10 runs pass
  • simple_gemini_function_call_assistant_example.py: 10/10 runs pass
  • Full simple_llm_assistant (9/9) and function_call_assistant (21/21) integration suites pass
  • Unit tests tests/tools/llms/test_gemini_tool.py + tests/tools/test_tool_factory.py: 26 pass
  • pre-commit (black/flake8/isort) clean on all changed files

Release impact

Merging this to main unblocks the gated 0.0.36 publish (pyproject 0.0.36 ≠ PyPI 0.0.35), so the existing version → publish → release chain will run and ship 0.0.36 once integration is green.

🤖 Generated with Claude Code

gemini-2.5-flash-lite has been hitting sustained 503 "high demand"
errors from Google, intermittently failing the Gemini integration tests
and blocking the 0.0.36 release. Move the default to gemini-3.5-flash,
which is stably available.

The Gemini integration tests also carried brittle assertions that check
for a literal keyword in the model's free-form response
(`"Grafi" in content`, `"weather" in content`). These passed only
because 2.5-flash-lite happened to phrase responses a certain way; newer
models phrase differently and intermittently fail them. Replace the
keyword checks with phrasing-independent non-empty-response assertions.
The meaningful assertions are retained: assistant role, response length
bounds, and exact event counts (which validate the tool was actually
invoked and the workflow ran end-to-end).

Also syncs uv.lock to version 0.0.36 (left stale by the version bump).

Verified: gemini_tool_example.py and simple_gemini_function_call_assistant_example.py
each pass 10/10 runs; full simple_llm_assistant and function_call_assistant
integration suites pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Copilot AI review requested due to automatic review settings June 23, 2026 20:07

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@GuanyiLi-Craig
GuanyiLi-Craig merged commit ec97a92 into main Jun 23, 2026
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2 participants