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Strict Formatter Agent with Hooks
VS Code Docs April 23, 2026
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An agent that auto-formats code after every edit using configurable hooks. Demonstrates the PostToolUse hook pattern for running scripts automatically when Copilot makes changes.
Agent Definition
Agent file: .github/agents/strict-formatter.agent.md
---
name: Strict Formatter
description: Agent that auto-formats code after every edit
hooks:
PostToolUse:
- type: command
command: "./scripts/format-changed-files.sh"
---
You are a code editing agent. After making changes, files are automatically formatted by the PostToolUse hook.
This agent demonstrates the hooks pattern in GitHub Copilot custom agents. Hooks allow automatic actions to run at specific points during agent sessions:
- PostToolUse: Runs after any tool is used (e.g., after an edit is made)
- PreToolUse: Runs before a tool is used
- PostChat: Runs after a chat response
The format script should:
1. Detect which files were changed
2. Run the project's formatter (Prettier, Black, gofmt, etc.)
3. Report any formatting changes made
This pattern ensures consistent code style regardless of the model's output formatting, and can be adapted for other post-edit operations like linting, type checking, or running tests.Comments
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