damage-control

name	damage-control
description	Install, configure, and manage Claude Code security hooks that block dangerous commands and protect sensitive files. Use when setting up security protection, blocking destructive commands (rm -rf, git reset --hard), protecting sensitive paths (.env, credentials), or managing PreToolUse hooks.

Defense-in-depth protection system for Claude Code. Uses PreToolUse hooks to intercept and validate tool calls before execution, blocking dangerous commands and protecting sensitive files.

<protection_levels>

Level	Read	Write	Edit	Delete	Use Case
zeroAccessPaths	No	No	No	No	Secrets, credentials, .env files
readOnlyPaths	Yes	No	No	No	System configs, lock files, build artifacts
noDeletePaths	Yes	Yes	Yes	No	Important project files, .git/, LICENSE
</protection_levels>

<how_it_works> PreToolUse hooks intercept tool calls at three points:

1. Bash Hook - Evaluates commands against regex patterns and path restrictions
2. Edit Hook - Validates file paths before modifications
3. Write Hook - Checks paths before file creation

Exit codes:

• 0 = Allow operation
• 0 + JSON = Ask for confirmation (triggers dialog)
• 2 = Block operation (stderr fed back to Claude)

Ask patterns: Some operations trigger confirmation dialogs instead of blocking:

• git checkout -- . (discards changes)
• git stash drop (deletes stash)
• DELETE FROM table WHERE id=X (SQL with specific ID) </how_it_works>

<quick_start> Interactive installation:

/damage-control install

Or ask Claude:

"Install damage control security hooks" "Set up protection for my project" </quick_start>

What would you like to do?

1. Install - Set up damage control hooks (global, project, or personal)
2. Modify - Add/remove protected paths or blocked commands
3. Test - Validate hooks are working correctly
4. List - View all active protections across all levels

Wait for response before proceeding.

| Response | Workflow | |----------|----------| | 1, "install", "setup", "deploy" | [workflows/install.md](workflows/install.md) | | 2, "modify", "add", "remove", "change" | [workflows/modify.md](workflows/modify.md) | | 3, "test", "verify", "check" | [workflows/test.md](workflows/test.md) | | 4, "list", "view", "show" | [workflows/list.md](workflows/list.md) |

Direct command routing (skip menu):

• "add ~/.credentials to zero access" → Execute directly, then restart reminder
• "block npm publish command" → Execute directly, then restart reminder
• "protect /secrets folder" → Execute directly, then restart reminder

After reading the workflow, follow it exactly.

<blocked_commands_summary> Destructive file operations:

• rm -rf, rm --recursive, sudo rm
• chmod 777, chown -R root

Git destructive:

• git reset --hard, git push --force (not --force-with-lease)
• git clean -fd, git stash clear, git filter-branch

Cloud destructive:

• AWS: terminate-instances, delete-db-instance, delete-stack
• GCP: projects delete, instances delete, clusters delete
• Docker: system prune -a, volume rm
• Kubernetes: delete namespace, delete all --all

Database destructive:

• DELETE FROM table; (no WHERE clause)
• DROP TABLE, DROP DATABASE, TRUNCATE TABLE
• redis-cli FLUSHALL, dropdb

See scripts/patterns.yaml for complete list. </blocked_commands_summary>

<settings_locations>

Level	Settings Path	Hooks Path	Scope
Global	~/.claude/settings.json	~/.claude/hooks/damage-control/	All projects
Project	.claude/settings.json	.claude/hooks/damage-control/	Team-shared
Personal	.claude/settings.local.json	.claude/hooks/damage-control/	Just you
</settings_locations>

<runtime_requirements> Python with UV (Recommended):

# macOS/Linux
curl -LsSf https://astral.sh/uv/install.sh | sh

# Windows
powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

TypeScript with Bun (Alternative):

# macOS/Linux
curl -fsSL https://bun.sh/install | bash && bun add yaml

# Windows
powershell -c "irm bun.sh/install.ps1 | iex" && bun add yaml

</runtime_requirements>

<critical_reminder> IMPORTANT: After any installation or modification:

Restart your agent for changes to take effect.

Hooks are only loaded at agent startup. Run /hooks after restart to verify. </critical_reminder>

<workflows_index>

Workflow	Purpose
workflows/install.md	Interactive installation at any settings level
workflows/modify.md	Add/remove protected paths and blocked commands
workflows/test.md	Validate all hooks are working correctly
workflows/list.md	View all active protections
</workflows_index>

<scripts_index>

Script	Purpose
scripts/bash-tool-damage-control.py	PreToolUse hook for Bash commands
scripts/edit-tool-damage-control.py	PreToolUse hook for Edit tool
scripts/write-tool-damage-control.py	PreToolUse hook for Write tool
scripts/test-damage-control.py	Test runner for hook validation
scripts/patterns.yaml	Security patterns and protected paths
scripts/settings-template.json	Hook configuration template
</scripts_index>

<success_criteria> A working damage-control installation has:

• Hooks installed at chosen level (global/project/personal)
• patterns.yaml copied alongside hook scripts
• settings.json updated with PreToolUse hook configuration
• UV (or Bun) runtime installed
• Agent restarted to load hooks
• Verified with /hooks command showing damage-control hooks
• Tested with rm -rf /tmp/test (should be blocked) </success_criteria>