fix(gemini): append user turn after assistant message

[mikemikimike]

Summary

Gemini's native provider rejects requests whose contents end with a model turn. Agent retries can produce this history after an assistant response has been appended.

This change appends a synthetic user continuation turn when the formatted Gemini contents end with model, matching the provider's API contract. It also adds a regression test for an assistant-terminated history.

Validation

• git diff --check passed.
• The focused pytest could not run in the available sparse checkout: the frozen workspace is missing the lib/cli package, and the fallback environment lacks vcr and CrewAI package modules. No live Gemini API was used.

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Reviewing files that changed from the base of the PR and between 226b2cd and 37759c2.

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• lib/crewai/src/crewai/llms/providers/gemini/completion.py

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📝 Walkthrough

Walkthrough

Changes

Gemini retry formatting

Layer / File(s)	Summary
Format and validate trailing user turn lib/crewai/src/crewai/llms/providers/gemini/completion.py, lib/crewai/tests/llms/google/test_google.py	_format_messages_for_gemini appends Please continue. after a final model turn without a function call. It preserves model turns with function calls. Tests verify both outcomes.

Suggested reviewers: lucasgomide

Merge Risk: ⚪ Minimal · up to 37759

This localized change appends a continuation turn when Gemini history ends after an assistant response, preventing provider request rejection while preserving function-call handling. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the Gemini formatting fix, the synthetic user turn, the regression test, and validation limits.
Title check	✅ Passed	The title clearly and concisely describes the main change: appending a user turn after an assistant message for Gemini.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@lib/crewai/src/crewai/llms/providers/gemini/completion.py`:
- Around line 675-684: Update GeminiCompletion._format_messages_for_gemini so
the continuation user turn is added only when the trailing model content has no
function_call parts; preserve pending function-call histories for proper
function_response handling or reject them explicitly. Add a regression test
covering a trailing assistant tool_calls message.

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ℹ️ Review info

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Configuration used: Organization UI

Review profile: CHILL

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Run ID: cb4f6adf-6b0a-42bb-97d8-756e6f9243f5

📥 Commits

Reviewing files that changed from the base of the PR and between fcdeb3d and 4f6c117.

📒 Files selected for processing (2)

• lib/crewai/src/crewai/llms/providers/gemini/completion.py
• lib/crewai/tests/llms/google/test_google.py

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

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