---
id: a2d02aea-07fd-4528-8158-f2f42a23a2dd
type: configuration
title: "Cargo check post-edit hook for Rust files in Claude Code"
tags: [sba-scouting, rust, claude-code, hooks, linting, cargo, configuration, developer-experience]
importance: 0.65
confidence: 0.8
created: "2026-03-02T00:33:26.804471+00:00"
updated: "2026-03-02T02:20:38.872040+00:00"
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---

# Cargo Check Post-Edit Hook Configuration

## File
`rust/.claude/settings.json`

## Purpose
Runs `cargo check --message-format=short` automatically after any Edit or Write to `.rs` files during a Claude Code session. Provides fast feedback without waiting for a manual build.

## Why cargo check (not clippy)
- `cargo clippy` is too slow for every single edit (takes several seconds)
- `cargo check` is faster — catches type errors and borrow checker issues quickly
- Clippy should be run manually at logical checkpoints:
  - Before commits
  - After finishing a feature
  - After batch edits to multiple files

## Settings JSON Structure
```json
{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": { "tool_name": ["Edit", "Write"], "file_paths": [".*\\.rs$"] },
        "hooks": [
          { "type": "command", "command": "cargo check --message-format=short" }
        ]
      }
    ]
  }
}
```

## Documentation
Also documented in `rust/CLAUDE.md` for future session context.