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fix(ahp): validate tool input before hook dispatch - #301
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Summary
Validate original tool arguments against the cached current schema before constructing or dispatching
tool.before. Malformed arguments now returnFailedBeforeInvocation(InvalidInput)with the tool name and JSON instance path, instead of being reported as a hook policy denial.Technical details
Validator initialization failures return
Internal. Early validation failures skip both hook events and tool execution without coercing arguments; the existing AHP arguments contract continues to reject invalid hook edits.