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Python: [BREAKING] Remove FunctionTool[Any] compatibility shim for schema passthrough (#3600) (#3907)

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* Fix #3600: Pass JSON schemas through without Pydantic conversion

This change optimizes FunctionTool and MCP flows by passing JSON schemas
directly to providers without converting them to Pydantic models first.

Key changes:
- Store JSON schema as-is when supplied to FunctionTool
- Skip Pydantic model_validate for schema-supplied tools in invoke()
- Return MCP tool schemas directly without conversion
- Add comprehensive tests for schema passthrough behavior

Performance benefits:
- Eliminates expensive Pydantic model creation for supplied schemas
- Preserves exact schema structure (additionalProperties, custom fields, etc.)
- Reduces memory overhead and initialization time

Maintains backward compatibility:
- Function signature inference still uses Pydantic models
- Explicit Pydantic models passed as input_model work as before
- All existing tests pass

* Fix schema passthrough validation and remove helper

* Simplify FunctionTool without generic model dependency

* Fix FunctionTool typing fallout in 3600

* Remove FunctionTool[Any] compatibility shim

* Use serializable kwargs in OTEL tool args
This commit is contained in:
Eduard van Valkenburg
2026-02-14 11:12:21 +01:00
committed by GitHub
Unverified
parent cd1e3110aa
commit fc9c81b0b1
16 changed files with 645 additions and 482 deletions
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python/packages/lab/tau2/agent_framework_lab_tau2/_tau2_utils.py
+1 -1
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@@ -27,7 +27,7 @@ from tau2.environment.tool import Tool # type: ignore[import-untyped]
_original_set_state = Environment.set_state
def convert_tau2_tool_to_function_tool(tau2_tool: Tool) -> FunctionTool[Any]:
def convert_tau2_tool_to_function_tool(tau2_tool: Tool) -> FunctionTool:
"""Convert a tau2 Tool to a FunctionTool for agent framework compatibility.
Creates a wrapper that preserves the tool's interface while ensuring