chore: deprecate function_calling_llm field

[greysonlalonde]

Note

Low Risk
Low risk: this only marks function_calling_llm as deprecated in Pydantic model schemas and does not change runtime execution logic. Main risk is downstream users seeing new deprecation warnings/metadata and needing to migrate before removal.

Overview
Marks the function_calling_llm model field as deprecated (with a removal notice) across core surfaces: Agent, Crew, and the LangGraphAgentAdapter and OpenAIAgentAdapter.

This updates the Pydantic Field(...) metadata to emit deprecation information in generated schemas/serialization, without otherwise changing how LLMs are resolved or used at runtime.

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Summary by CodeRabbit

• Chores
  • Deprecated the function_calling_llm field across the platform, scheduled for removal in a future release. Plan accordingly if your workflows depend on this field.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds deprecation metadata to the function_calling_llm field across four core models in the crewAI codebase. The field definition in each model now includes a Pydantic deprecation marker, signaling users that this field will be removed in a future release. No functional changes, logic modifications, or type alterations are made.

Changes

Deprecate function_calling_llm Across Model Definitions

Layer / File(s)	Summary
Add deprecation markers to function_calling_llm fields lib/crewai/src/crewai/agent/core.py, lib/crewai/src/crewai/crew.py, lib/crewai/src/crewai/agents/agent_adapters/langgraph/langgraph_adapter.py, lib/crewai/src/crewai/agents/agent_adapters/openai_agents/openai_adapter.py	Four function_calling_llm field declarations in Agent, Crew, LangGraphAgentAdapter, and OpenAIAgentAdapter are updated with identical deprecation messages via Pydantic Field(deprecated=...) metadata. Field types, defaults, and descriptions remain unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A field grows old and fades away,
Marked deprecated, here to stay—
Four models wave their last goodbye,
Before this llm field will die.
Hop along, the new path waits! 🌟

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately describes the main change: adding deprecation markers to the function_calling_llm field across multiple files in the codebase.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/deprecate-function-calling-llm-field

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