Claude Code’s ability to act as a Git hook can significantly streamline your commit process. By setting up a pre-commit hook that leverages Claude Code, you can automatically generate a well-formed commit message based on your code changes. This ensures consistency across your team and reduces the cognitive load of crafting perfect messages every time.
To implement this, you’ll need to configure your .git/hooks/pre-commit file. A simple shell script can pipe the output of git diff --cached to the Claude API via the MCP CLI. The response from Claude can then be used to populate the commit message. This approach ensures that your commit messages accurately reflect the changes made.
Here’s a basic example of a pre-commit script. Ensure you have the MCP CLI installed and configured with your Claude API key.
#!/bin/bash
# Get the diff of staged changes
STAGED_DIFF=$(git diff --cached)
# If there are no staged changes, exit
if [ -z "$STAGED_DIFF" ]; then
exit 0
fi
# Use MCP CLI to get a commit message from Claude
COMMIT_MESSAGE=$(mcp claude-3-opus-20240229 --prompt "Generate a concise and descriptive Git commit message for the following code changes:\n\n$STAGED_DIFF" --max-tokens 150)
# Prepend the generated message to the commit
echo -e "$COMMIT_MESSAGE\n" | cat - .git/COMMIT_EDITMSG
# To make this hook work, you'll need to:
# 1. Make the script executable: chmod +x .git/hooks/pre-commit
# 2. Potentially adjust the prompt for your team's conventions.
This hook runs before each commit, presenting you with an AI-generated message. You can then edit it if needed, or accept it as is, ensuring your commit history is more informative and standardized. This is a powerful way to integrate AI assistance directly into your existing version control workflow.