fix(llms): give gemini -latest aliases full tool capabilities

[Madin-H23]

Related issue

Fixes #7636

Summary

The version-less aliases listed in GEMINI_MODELS (gemini-flash-latest, gemini-flash-lite-latest, gemini-pro-latest) never match the gemini-<version> regex in _normalize_gemini_fields, so they fell back to pre-1.5 defaults: supports_tools=False dropped tools from GenerateContentConfig entirely, supports_function_calling() returned False (silently downgrading agents to the ReAct protocol), structured output took the legacy response_schema path, and thinking was not auto-enabled.

Following the approach sketched in the issue (same shape as the Anthropic fix in #4009): a new GEMINI_LATEST_ALIASES map in llms/constants.py (next to GEMINI_MODELS) resolves the three aliases to the 2.5 generation when the version regex misses. The regex itself is untouched, so ids like gemini-gemma-2-27b-it — which carry a version but no function calling — keep the pre-1.5 defaults.

Verification

• pytest lib/crewai/tests/llms/google/test_google.py -n0 → all previously-passing tests still pass (the 9 pre-existing cassette-based failures reproduce identically on unpatched main); the new tests add 4 passes:
  • parametrized over all three aliases: supports_tools is True and supports_function_calling() is True
  • gemini-gemma-2-27b-it guard: still supports_tools == False — pins that the alias map doesn't loosen the regex
  • red-check: the alias tests fail against unpatched main (verified via git stash)
• ruff check / ruff format --check clean on all three files.

Additional context

Out of scope per the issue: gemini-robotics-er-1.5-preview and the gemini-live-* ids.

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

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

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📝 Walkthrough

Walkthrough

Gemini capability detection now resolves three version-less latest aliases to generation 2.5. This enables the corresponding tool, function-calling, Gemini 2.0, and automatic-thinking behavior. Tests cover these aliases and preserve Gemma behavior.

Changes

Gemini alias capabilities

Layer / File(s)	Summary
Gemini alias capability resolution lib/crewai/src/crewai/llms/constants.py, lib/crewai/src/crewai/llms/providers/gemini/completion.py	Adds explicit generation mappings for three -latest aliases. Capability detection uses numeric versions or the alias map, then applies tool, Gemini 2.0, and automatic-thinking thresholds.
Gemini alias regression coverage lib/crewai/tests/llms/google/test_google.py	Tests tool and native function-calling support for the three latest aliases and confirms that the Gemma alias remains without tool support.

Priority: ➖ Normal

Severity of issue fixed: Medium

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the Gemini -latest alias fix and the restored tool capabilities. It is concise and directly related to the main change.
Description check	✅ Passed	The description includes the related issue, a detailed summary, verification results, test coverage, lint and formatting checks, known baseline failures, and out-of-scope models. It satisfies the requ…
Linked Issues check	✅ Passed	The pull request satisfies #7636. GEMINI_LATEST_ALIASES maps the three version-less aliases to 2.5. _normalize_gemini_fields uses this map when the numeric version regex does not match. The resolv…
Out of Scope Changes check	✅ Passed	The current pull request summary identifies changes in the Gemini constants, Gemini completion logic, and related Gemini tests. These changes support #7636. The explicit map contains only the three re…

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[Madin-H23]

CodeRabbit's out-of-scope warning was correct: this branch was cut from the working branch of #7587 and carried that commit. The branch is now rebased onto current main — the diff contains only the Gemini alias fix (3 files) plus the docstring for _normalize_gemini_fields (addressing the docstring-coverage warning). Tests re-run after the rebase: 48 passed, the 9 failures are the pre-existing cassette-based ones that reproduce identically on unpatched main.