feat: add PostToolUseFailure hook event type#535
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ashwin-ant merged 1 commit intomainfrom Jan 30, 2026
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Add support for the PostToolUseFailure hook event, which fires when a tool use fails. This includes: - PostToolUseFailureHookInput with tool_name, tool_input, tool_use_id, error, and optional is_interrupt fields - PostToolUseFailureHookSpecificOutput with additionalContext field - "PostToolUseFailure" literal added to HookEvent, HookInput, and HookSpecificOutput union types - New types exported from __init__.py and added to __all__ Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
ollie-anthropic
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Jan 30, 2026
## Summary - Add `PostToolUseFailureHookInput` type with fields for `tool_name`, `tool_input`, `tool_use_id`, `error`, and optional `is_interrupt` - Add `PostToolUseFailureHookSpecificOutput` type with `additionalContext` field - Add `"PostToolUseFailure"` to `HookEvent`, `HookInput`, and `HookSpecificOutput` union types - Export new types from `__init__.py` and add to `__all__` ## Test plan - [ ] Verify `PostToolUseFailureHookInput` can be constructed with required and optional fields - [ ] Verify `PostToolUseFailureHookSpecificOutput` accepts valid output shapes - [ ] Verify type checking passes with `mypy` - [ ] Verify existing tests still pass ## Changelog <!-- CHANGELOG:START --> Added `PostToolUseFailure` hook event type for handling tool use failures, including `PostToolUseFailureHookInput` and `PostToolUseFailureHookSpecificOutput` types. <!-- CHANGELOG:END --> 🤖 Generated with [Claude Code](https://claude.com/claude-code) (0% 4-shotted by claude) Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
PostToolUseFailureHookInputtype with fields fortool_name,tool_input,tool_use_id,error, and optionalis_interruptPostToolUseFailureHookSpecificOutputtype withadditionalContextfield"PostToolUseFailure"toHookEvent,HookInput, andHookSpecificOutputunion types__init__.pyand add to__all__Test plan
PostToolUseFailureHookInputcan be constructed with required and optional fieldsPostToolUseFailureHookSpecificOutputaccepts valid output shapesmypyChangelog
Added
PostToolUseFailurehook event type for handling tool use failures, includingPostToolUseFailureHookInputandPostToolUseFailureHookSpecificOutputtypes.