Marketplace claude-code-hooks

Claude Code hook system for pre/post tool execution. Triggers on: hooks, PreToolUse, PostToolUse, hook script, tool validation, audit logging.

install

source · Clone the upstream repo

git clone https://github.com/aiskillstore/marketplace

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/aiskillstore/marketplace "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/0xdarkmatter/claude-code-hooks" ~/.claude/skills/aiskillstore-marketplace-claude-code-hooks && rm -rf "$T"

manifest: skills/0xdarkmatter/claude-code-hooks/SKILL.md

Claude Code Hooks

Execute custom scripts before/after Claude Code tool invocations.

Quick Reference

Event	When	Has Matcher
`PreToolUse`	Before tool execution	Yes
`PostToolUse`	After tool completes	Yes
`PermissionRequest`	Permission dialog shown	Yes
`Notification`	Notifications sent	Yes
`UserPromptSubmit`	User submits prompt	No
`Stop`	Agent finishes	No
`SubagentStop`	Subagent finishes	No
`PreCompact`	Before context compaction	No
`SessionStart`	Session begins/resumes	No
`SessionEnd`	Session ends	No

Basic Configuration

Add to

~/.claude/settings.json

.claude/settings.local.json

{
  "hooks": {
    "PreToolUse": [{
      "matcher": "Bash",
      "hooks": [{
        "type": "command",
        "command": "$CLAUDE_PROJECT_DIR/hooks/validate.sh",
        "timeout": 5000
      }]
    }]
  }
}

Matcher Patterns

Pattern	Matches
`"Write"`	Only Write tool
`"*"` or `""`	All tools
`"mcp__*"`	All MCP tools
`"Bash"`	Bash commands

Hook Script Requirements

#!/bin/bash
# Receives JSON via stdin: { "tool_name": "...", "tool_input": {...} }
INPUT=$(cat)
TOOL=$(echo "$INPUT" | jq -r '.tool_name')

# Exit codes:
# 0 = Success (continue)
# 2 = Block with error (stderr shown to Claude)
# Other = Non-blocking error

Common Use Cases

Use Case	Event	Example
Validate inputs	PreToolUse	Block dangerous commands
Audit logging	PostToolUse	Log all tool usage
Custom approval	PermissionRequest	Slack notification
Session init	SessionStart	Load project context

Security Checklist

Quote all variables:
```
"$VAR"
```
not
```
$VAR
```
Validate paths (no
```
..
```
traversal)
Use
```
$CLAUDE_PROJECT_DIR
```
for paths
Set reasonable timeouts
Handle jq parsing errors

Troubleshooting

# Debug hook loading
claude --debug

# List registered hooks
/hooks

# Test script manually
echo '{"tool_name":"Bash"}' | ./hooks/validate.sh

Official Documentation

https://code.claude.com/docs/en/hooks - Hooks reference
https://code.claude.com/docs/en/settings - Settings configuration

Additional Resources

```
./references/hook-events.md
```
- All events with input/output schemas
```
./references/configuration.md
```
- Advanced config patterns
```
./references/security-patterns.md
```
- Production security

See Also:

claude-code-debug

for troubleshooting,

claude-code-headless

for CLI automation