---
id: b5623458-9ace-43ae-ae7e-101d465498ee
type: SOLVES
from_id: be0bda86-d893-4f86-97c4-0ca4e1073121
from_title: "Fix: Claude Code PostToolUse hook correct JSON format"
to_id: a2d02aea-07fd-4528-8158-f2f42a23a2dd
to_title: "Cargo check post-edit hook for Rust files in Claude Code"
strength: 0.95
created: "2026-03-02T02:20:38.872040+00:00"
updated: "2026-03-02T02:20:38.872040+00:00"
---

The PostToolUse hook format fix directly solved the broken cargo check hook configuration. The original config used incorrect field names (tool_name, file_glob as object fields) and wrong event key (PostToolCall). The fix provided the correct format: PostToolUse event, matcher as plain regex string, hooks array with type:command.