feat: add public tool_spec setter #1822
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mkmeral wants to merge 4 commits intostrands-agents:mainfrom
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mkmeral
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zastrowm
previously approved these changes
Mar 6, 2026
| Args: | ||
| value: The new tool specification. | ||
| """ | ||
| self._tool_spec = value |
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We don't need to do any extra validations?
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I've added extra validation for throwing exceptions early on for basic things 👍
The json wrapper inside inputSchema is not required — both normalize_tool_spec and the registry's validate_tool_spec handle bare schemas by wrapping them automatically. The setter should only enforce what the ToolSpec TypedDict requires: name, description, inputSchema.
zastrowm
approved these changes
Mar 6, 2026
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Description
Add a public
tool_specsetter property toDecoratedFunctionToolandPythonAgentTool, enabling runtime modification of a tool's schema after construction.This is useful for dynamically adjusting tool configurations based on feature flags, user permissions, or other runtime conditions — for example, adding or removing parameters from a tool's input schema without recreating the tool instance.
Changes:
src/strands/tools/decorator.py— Added@tool_spec.setteronDecoratedFunctionToolsrc/strands/tools/tools.py— Added@tool_spec.setteronPythonAgentTooltests/strands/tools/test_tool_spec_setter.py— 5 unit tests covering both classesRelated Issues
Documentation PR
Type of Change
New feature
Testing
Added
tests/strands/tools/test_tool_spec_setter.pywith 5 tests:TestDecoratedFunctionToolSpecSetter(3 tests): verifies spec replacement, persistence across reads, and adding properties via setterTestPythonAgentToolSpecSetter(2 tests): verifies spec replacement and persistence across readsAll tests pass:
hatch run prepareChecklist
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