claude-to-agy

A lightweight MCP bridge that lets Claude Code delegate heavy tasks to the Antigravity CLI (agy) - saving context window and tokens for what matters.

What It Does

Registers a delegate_to_agy MCP tool that Claude automatically uses when it encounters:

• Large files (>200 lines) - logs, dumps, generated code
• Multi-file analysis (>3 files at once)
• Deep searches - git log, git diff, grep
• Web lookups - documentation, external knowledge
• Adversarial review / plan critique - always delegated

Claude sends a prompt + file paths → the bridge runs agy CLI → returns the result.

Requirements

• Python 3.10+
• agy CLI installed and authenticated
• Claude Code

Installation

# 1. Clone anywhere on your machine
git clone https://github.com/rauls-kjarners/claude-to-agy.git ~/.claude-to-agy

# 2. Install dependencies via uv
cd ~/.claude-to-agy
uv sync

# 3. Register the MCP server (global - works in any project)
claude mcp add -s user claude-to-agy uv run --directory ~/.claude-to-agy claude-to-agy

# 4. Copy the rules file into any project where you want delegation
cp ~/.claude-to-agy/CLAUDE.md /path/to/your/project/CLAUDE.md

# 5. (Optional) Add the PreToolUse hook to enforce delegation for subagents

Then merge the following into your ~/.claude/settings.json (or per-project .claude/settings.json):

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Bash",
        "hooks": [
          {
            "type": "command",
            "command": "claude-agy-hook",
            "onError": "block"
          }
        ]
      }
    ]
  }
}

That's it. Claude will now automatically delegate heavy tasks to Antigravity CLI in any project that has the CLAUDE.md file.

Tip: To enable globally without copying CLAUDE.md per project, add the rules to ~/.claude/CLAUDE.md instead.

Why the Hook Matters

CLAUDE.md rules only apply to the main Claude agent. Subagents (spawned via run_subagent or similar) do not read CLAUDE.md and will run grep -r, git diff, etc. directly - wasting tokens and defeating the purpose of delegation.

The PreToolUse hook runs at the Claude Code platform level for all agents (main + sub), mechanically blocking banned commands before they execute.

Using as a Skill

This project also includes a SKILL.md file, which is the standard format for reusable Claude Code skills. If your setup supports skills, you can use it instead of manually copying CLAUDE.md:

claude skill add ~/.claude-to-agy/SKILL.md

Note: You still need the MCP server registered (step 2 above). The skill provides the rules, MCP provides the tool.

Configuration

All settings are optional environment variables:

How It Works

User → Claude Code → MCP bridge ([FastMCP](https://github.com/jlowin/fastmcp)) → agy CLI → Gemini API
                   ←                                                         ←         ←

1. CLAUDE.md instructs Claude when to delegate
2. Claude calls delegate_to_agy(prompt, cwd, files?) via MCP
3. bridge.py prepends file paths to the prompt
4. Runs agy --dangerously-skip-permissions --add-dir <cwd> -p "<prompt>"
5. Returns the text output cleanly or raises an exception natively handled by FastMCP

Development

# Linting & Formatting
uv run ruff check .
uv run ruff format .

# Type Checking
uv run pyright

# Tests
uv run pytest

# Pre-commit Hooks (Run before committing)
uv run pre-commit install

License

MIT