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Add tool call arguments in ToolContext for RunHooks #1765

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Add tool call arguments in ToolContext for RunHooks #1765

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@ihower ihower commented Sep 17, 2025 •
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Background

Currently, the RunHooks lifecycle (on_tool_start, on_tool_end) exposes the Tool and ToolContext, but does not include the actual arguments passed to the tool call.

Solution

This implementation is inspired by PR #1598.

  • Add a new tool_arguments field to ToolContext and populate it via from_agent_context with tool_call.arguments.
  • Update lifecycle_example.py to demonstrate tool_arguments in hooks
  • Unlike the proposal in PR #253, this solution is not expected to introduce breaking changes, making it easier to adopt.

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@ihower @seratch