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| 1 | +# Claude Code Hooks for nf-core Website |
| 2 | + |
| 3 | +This directory contains Claude Code hooks that automatically format and lint files when Claude modifies them, providing real-time feedback on prose quality using Python for robust JSON processing and integration. |
| 4 | + |
| 5 | +## Available Hooks |
| 6 | + |
| 7 | +### 🔧 `post-tool.py` |
| 8 | + |
| 9 | +**Triggers**: After Claude uses Write, Edit, or MultiEdit tools |
| 10 | +**Implementation**: Python 3 with structured JSON input/output |
| 11 | +**Actions**: |
| 12 | + |
| 13 | +- Reads Claude Code's structured JSON input via stdin |
| 14 | +- Runs `prettier --write` on modified files for consistent formatting |
| 15 | +- Runs `vale` prose linting on markdown/MDX files |
| 16 | +- Provides immediate feedback on writing quality to Claude via JSON output |
| 17 | +- Respects existing `.vale.ini` configuration |
| 18 | +- Returns `additionalContext` to Claude when prose issues are found |
| 19 | + |
| 20 | +### 📋 `user-prompt-submit.py` |
| 21 | + |
| 22 | +**Triggers**: When user submits documentation-related prompts |
| 23 | +**Implementation**: Python 3 with smart prompt detection |
| 24 | +**Actions**: |
| 25 | + |
| 26 | +- Reads user prompt from Claude Code's JSON input |
| 27 | +- Checks recently modified documentation files (last 10 minutes) |
| 28 | +- Runs Vale prose quality checks on recent files |
| 29 | +- Only activates for documentation-related prompts (auto-detects keywords) |
| 30 | +- Provides context to Claude via JSON output about documentation quality |
| 31 | +- Adds guidance on nf-core documentation standards |
| 32 | + |
| 33 | +### 🛠️ `utils.py` |
| 34 | + |
| 35 | +**Purpose**: Shared Python utilities for all hooks |
| 36 | +**Functions**: |
| 37 | + |
| 38 | +- JSON input/output handling for Claude Code integration |
| 39 | +- Tool availability checking (prettier, vale) |
| 40 | +- File type filtering and validation |
| 41 | +- Robust formatting and linting with error handling |
| 42 | +- Recent file detection and processing |
| 43 | +- Claude Code hook output formatting |
| 44 | + |
| 45 | +## Setup Instructions |
| 46 | + |
| 47 | +### 1. Configure Claude Code Settings |
| 48 | + |
| 49 | +The hooks are automatically configured in `.claude/settings.local.json`: |
| 50 | + |
| 51 | +```json |
| 52 | +{ |
| 53 | + "hooks": { |
| 54 | + "PostToolUse": [ |
| 55 | + { |
| 56 | + "matcher": "Write|Edit|MultiEdit", |
| 57 | + "hooks": [ |
| 58 | + { |
| 59 | + "type": "command", |
| 60 | + "command": "\"$CLAUDE_PROJECT_DIR\"/hooks/post-tool.py" |
| 61 | + } |
| 62 | + ] |
| 63 | + } |
| 64 | + ], |
| 65 | + "UserPromptSubmit": [ |
| 66 | + { |
| 67 | + "hooks": [ |
| 68 | + { |
| 69 | + "type": "command", |
| 70 | + "command": "\"$CLAUDE_PROJECT_DIR\"/hooks/user-prompt-submit.py" |
| 71 | + } |
| 72 | + ] |
| 73 | + } |
| 74 | + ] |
| 75 | + } |
| 76 | +} |
| 77 | +``` |
| 78 | + |
| 79 | +### 2. Verify Dependencies |
| 80 | + |
| 81 | +The hooks work best when these tools are installed: |
| 82 | + |
| 83 | +- **Python 3** - Hook implementation language (system default) |
| 84 | +- **prettier** - Code formatting (`npm install -g prettier`) |
| 85 | +- **vale** - Prose linting (`brew install vale`) |
| 86 | + |
| 87 | +### 3. Test the Setup |
| 88 | + |
| 89 | +```bash |
| 90 | +# Test post-tool hook with proper Claude Code JSON input |
| 91 | +echo '{"tool_name":"Write","tool_input":{"file_path":"test.md"}}' | ./hooks/post-tool.py |
| 92 | + |
| 93 | +# Test user-prompt-submit hook with documentation prompt |
| 94 | +echo '{"prompt":"Help me write documentation"}' | ./hooks/user-prompt-submit.py |
| 95 | + |
| 96 | +# Test user-prompt-submit hook with non-documentation prompt (should exit silently) |
| 97 | +echo '{"prompt":"What is the weather?"}' | ./hooks/user-prompt-submit.py |
| 98 | +``` |
| 99 | + |
| 100 | +## How It Works |
| 101 | + |
| 102 | +### Post-Tool Hook Flow |
| 103 | + |
| 104 | +1. **Claude modifies files** using Write/Edit/MultiEdit |
| 105 | +2. **Hook triggers** automatically after tool execution |
| 106 | +3. **Prettier formats** the modified files for consistency |
| 107 | +4. **Vale checks prose** quality and terminology |
| 108 | +5. **Feedback provided** to Claude about writing quality |
| 109 | + |
| 110 | +### User-Prompt Hook Flow |
| 111 | + |
| 112 | +1. **User submits prompt** containing documentation keywords |
| 113 | +2. **Hook scans** for recently modified documentation files |
| 114 | +3. **Vale checks** prose quality of recent changes |
| 115 | +4. **Summary provided** before Claude responds |
| 116 | + |
| 117 | +### Smart Filtering |
| 118 | + |
| 119 | +- **File types**: Only processes `.md`, `.mdx`, `.js`, `.ts`, `.astro`, `.yml`, `.yaml` |
| 120 | +- **Vale linting**: Only on markdown/MDX files |
| 121 | +- **Respects `.vale.ini`**: Ignores API reference docs and old events |
| 122 | +- **Performance**: Only processes changed files |
| 123 | + |
| 124 | +## Benefits |
| 125 | + |
| 126 | +### For Claude |
| 127 | + |
| 128 | +- ✅ **Real-time feedback** on prose quality |
| 129 | +- ✅ **Learning opportunity** from Vale suggestions |
| 130 | +- ✅ **Consistent formatting** via prettier |
| 131 | +- ✅ **Terminology awareness** (nf-core specific terms) |
| 132 | + |
| 133 | +### For Contributors |
| 134 | + |
| 135 | +- ✅ **Automatic formatting** of Claude-generated content |
| 136 | +- ✅ **Prose quality assurance** built into the workflow |
| 137 | +- ✅ **Consistent style** across all documentation |
| 138 | +- ✅ **No additional setup** required |
| 139 | + |
| 140 | +### For Project |
| 141 | + |
| 142 | +- ✅ **Maintains high documentation standards** |
| 143 | +- ✅ **Reduces review overhead** for maintainers |
| 144 | +- ✅ **Ensures consistent terminology** usage |
| 145 | +- ✅ **Professional documentation** quality |
| 146 | + |
| 147 | +## Example Output |
| 148 | + |
| 149 | +When Claude modifies a file with prose issues: |
| 150 | + |
| 151 | +``` |
| 152 | +🤖 Claude Code Hook: Post-Tool Formatting & Linting |
| 153 | +━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ |
| 154 | +
|
| 155 | +🔧 Tool used: Edit |
| 156 | +📁 Processing files: |
| 157 | + → docs/new-guide.md |
| 158 | +🎨 Formatting docs/new-guide.md with prettier... |
| 159 | +✅ Formatted successfully |
| 160 | +📝 Checking prose quality with Vale... |
| 161 | +📊 Vale found prose suggestions: |
| 162 | + 7:8 error Use 'nf-core' instead of 'nf_core' |
| 163 | + 9:5 error Use 'Bytesize' instead of 'bytesize' |
| 164 | +
|
| 165 | +💡 These suggestions help improve documentation clarity and consistency. |
| 166 | +``` |
| 167 | + |
| 168 | +## Troubleshooting |
| 169 | + |
| 170 | +### Hook Not Running |
| 171 | + |
| 172 | +- Verify hooks are configured in Claude Code settings |
| 173 | +- Check that hook files are executable (`chmod +x hooks/*.sh`) |
| 174 | +- Ensure you're in the correct directory |
| 175 | + |
| 176 | +### Missing Tools |
| 177 | + |
| 178 | +- Install prettier: `npm install -g prettier` |
| 179 | +- Install Vale: `brew install vale` |
| 180 | +- Hooks will gracefully skip missing tools |
| 181 | + |
| 182 | +### Vale Issues |
| 183 | + |
| 184 | +- Hooks respect your existing `.vale.ini` configuration |
| 185 | +- API reference docs and old events are automatically ignored |
| 186 | +- Vale suggestions are informational, not blocking |
| 187 | + |
| 188 | +This system creates a seamless feedback loop where Claude learns from its writing and continuously improves documentation quality! 🚀 |
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