just-interceptor

just-interceptor

Claude Code plugin that intercepts raw CLI commands and redirects to project-standard just recipes.

When Claude tries to run npm install, docker compose up, or any command you've mapped, the hook denies it and tells Claude to use the corresponding just recipe instead.

Install

Add the marketplace and install:

/plugin marketplace add kettleofketchup/claude-just-interceptor
/plugin install just-interceptor@claude-just-interceptor

Project Setup

Create .claude/just-interceptor.json in your project root with command mappings:

{
  "redirects": [
    {
      "category": "npm",
      "enabled": true,
      "pattern": "^npm install",
      "just_command": "just npm::install",
      "reason": "Project-standard npm install with correct working directory"
    },
    {
      "category": "docker",
      "enabled": true,
      "pattern": "^docker compose up",
      "just_command": "just docker::up",
      "reason": "Uses project-specific compose configuration"
    }
  ]
}

Config Fields

Field	Type	Description
category	string	Grouping label shown in the redirect message
enabled	boolean	Set false to disable without removing
pattern	string	Regex matched against the full command string
just_command	string	The just recipe to suggest
reason	string	Explanation shown to Claude

How It Works

1. Claude Code fires a PreToolUse event before every Bash tool call
2. The hook reads the command from stdin JSON
3. Checks patterns in the project's .claude/just-interceptor.json
4. Match: Returns deny with redirect message pointing to the just recipe
5. No match: Exits silently, command proceeds normally

Requirements

• just must be available on PATH
• jq must be available on PATH

License

MIT