# CodexLens Real LSP Implementation - Summary

> **Date**: 2026-01-19  
> **Status**: Planning Complete, Implementation Ready  
> **Focus**: Real LSP Server + VSCode Bridge Integration

---

## ✅ Completed Work

### 1. Planning Documents

#### a. Main Implementation Plan
**File**: `docs/REAL_LSP_SERVER_PLAN.md`

**Content**:
- Complete architecture design for real LSP server
- 5-phase implementation plan
- Multi-language support strategy (TypeScript, Python, Go, Rust, Java, C/C++)
- Language server multiplexer design
- Position tolerance feature (cclsp-like)
- MCP integration layer

**Key Decisions**:
- Use `pygls` library for LSP implementation
- Support 6+ language servers via multiplexer
- Implement position tolerance for fuzzy AI-generated positions
- Three integration paths: Standalone LSP, VSCode Bridge, Index-based fallback

#### b. VSCode Bridge Implementation (Appendix A)
**Included in**: `docs/REAL_LSP_SERVER_PLAN.md`

**Content**:
- HTTP-based VSCode extension bridge
- MCP tool integration (vscode_lsp)
- Complete architecture diagram
- API endpoint specifications
- Comparison with standalone LSP approach

### 2. VSCode Bridge Extension

#### Created Files:
1. **`ccw-vscode-bridge/package.json`**
   - VSCode extension manifest
   - Dependencies: @types/node, @types/vscode, typescript

2. **`ccw-vscode-bridge/tsconfig.json`**
   - TypeScript compilation configuration
   - Target: ES2020, CommonJS modules

3. **`ccw-vscode-bridge/src/extension.ts`**
   - HTTP server on port 3457
   - 4 API endpoints:
     - `POST /get_definition`
     - `POST /get_references`
     - `POST /get_hover`
     - `POST /get_document_symbols`
   - VSCode API integration via `vscode.commands.executeCommand`

4. **`ccw-vscode-bridge/.vscodeignore`**
   - Build artifact exclusion rules

5. **`ccw-vscode-bridge/README.md`**
   - Installation & usage instructions
   - API endpoint documentation

#### Features:
- ✅ Real-time VSCode LSP integration
- ✅ HTTP REST API for external tools
- ✅ CORS support
- ✅ Error handling
- ✅ Automatic VSCode feature detection

### 3. CCW MCP Tool

#### Created File:
**`ccw/src/tools/vscode-lsp.ts`**

**Features**:
- ✅ 4 LSP actions: get_definition, get_references, get_hover, get_document_symbols
- ✅ Zod schema validation
- ✅ HTTP client with timeout (10s)
- ✅ Connection retry logic
- ✅ Comprehensive error messages

**Parameters**:
- `action` (required): LSP action type
- `file_path` (required): Absolute file path
- `line` (optional): Line number (1-based)
- `character` (optional): Character position (1-based)

#### Integration:
**Modified File**: `ccw/src/tools/index.ts`

- ✅ Imported `vscodeLspMod`
- ✅ Registered tool via `registerTool(toLegacyTool(vscodeLspMod))`
- ✅ Available in MCP server tool list

---

## 📋 Implementation Architecture

### Three Integration Paths

```
Path 1: VSCode Bridge (✅ Implemented)
─────────────────────────────────────
Claude Code → vscode_lsp MCP tool → HTTP → ccw-vscode-bridge → VSCode API → Language Servers

Path 2: Standalone LSP Server (📝 Planned)
──────────────────────────────────────────
Any LSP Client → codexlens-lsp → Language Server Multiplexer → Language Servers

Path 3: Index-Based (✅ Existing)
─────────────────────────────────
Claude Code → codex_lens_lsp → Python API → SQLite Index → Cached Results
```

### Smart Routing Strategy

```javascript
// Priority: VSCode Bridge → Standalone LSP → Index-based
if (vscodeBridgeAvailable) {
  return useVSCodeBridge();
} else if (standaloneLSPAvailable) {
  return useStandaloneLSP();
} else {
  return useIndexBased();
}
```

---

## 🎯 Next Steps

### Immediate Actions (Phase 1)

1. **Test VSCode Bridge**
   ```bash
   cd ccw-vscode-bridge
   npm install
   npm run compile
   # Press F5 in VSCode to launch extension
   ```

2. **Test vscode_lsp Tool**
   ```bash
   # Start CCW MCP server
   cd ccw
   npm run mcp

   # Test via MCP client
   {
     "tool": "vscode_lsp",
     "arguments": {
       "action": "get_definition",
       "file_path": "/path/to/file.ts",
       "line": 10,
       "character": 5
     }
   }
   ```

3. **Document Testing Results**
   - Create test reports
   - Benchmark latency
   - Validate accuracy

### Medium-Term Goals (Phase 2-3)

1. **Implement Standalone LSP Server**
   - Setup `codexlens-lsp` project structure
   - Implement language server multiplexer
   - Add core LSP handlers

2. **Add Position Tolerance**
   - Implement fuzzy position matching
   - Test with AI-generated positions

3. **Create Integration Tests**
   - Unit tests for each component
   - E2E tests with real language servers
   - Performance benchmarks

### Long-Term Goals (Phase 4-5)

1. **MCP Context Enhancement**
   - Integrate LSP results into MCP context
   - Hook system for Claude Code

2. **Advanced Features**
   - Code actions
   - Formatting
   - Rename support

3. **Production Deployment**
   - Package VSCode extension to .vsix
   - Publish to VS Code marketplace
   - Create installation scripts

---

## 📊 Project Status Matrix

| Component | Status | Files | Tests | Docs |
|-----------|--------|-------|-------|------|
| VSCode Bridge Extension | ✅ Complete | 5/5 | ⏳ Pending | ✅ Complete |
| vscode_lsp MCP Tool | ✅ Complete | 1/1 | ⏳ Pending | ✅ Complete |
| Tool Registration | ✅ Complete | 1/1 | N/A | N/A |
| Planning Documents | ✅ Complete | 2/2 | N/A | ✅ Complete |
| Standalone LSP Server | 📝 Planned | 0/8 | 0/12 | ✅ Complete |
| Integration Tests | 📝 Planned | 0/3 | 0/15 | ⏳ Pending |

---

## 🔧 Development Environment

### Prerequisites

**For VSCode Bridge**:
- Node.js ≥ 18
- VSCode ≥ 1.80
- TypeScript ≥ 5.0

**For Standalone LSP**:
- Python ≥ 3.8
- pygls ≥ 1.3.0
- Language servers:
  - TypeScript: `npm i -g typescript-language-server`
  - Python: `pip install python-lsp-server`
  - Go: `go install golang.org/x/tools/gopls@latest`
  - Rust: `rustup component add rust-analyzer`

### Installation Commands

```bash
# VSCode Bridge
cd ccw-vscode-bridge
npm install
npm run compile

# CCW MCP (already setup)
cd ccw
npm install

# Future: Standalone LSP
cd codex-lens
pip install -e ".[lsp]"
```

---

## 📖 Documentation Index

| Document | Purpose | Status |
|----------|---------|--------|
| `REAL_LSP_SERVER_PLAN.md` | Complete implementation plan | ✅ |
| `LSP_INTEGRATION_PLAN.md` | Original integration strategy | ✅ |
| `MCP_ENDPOINT_DESIGN.md` | MCP endpoint specifications | ✅ |
| `IMPLEMENTATION_SUMMARY.md` | This document | ✅ |
| `ccw-vscode-bridge/README.md` | Bridge usage guide | ✅ |
| `TESTING_GUIDE.md` | Testing procedures | ⏳ TODO |
| `DEPLOYMENT_GUIDE.md` | Production deployment | ⏳ TODO |

---

## 💡 Key Design Decisions

### 1. Why Three Integration Paths?

- **VSCode Bridge**: Easiest setup, leverages VSCode's built-in language servers
- **Standalone LSP**: IDE-agnostic, works with any LSP client
- **Index-based**: Fallback for offline or cached queries

### 2. Why HTTP for VSCode Bridge?

- ✅ Simplest cross-process communication
- ✅ No complex IPC/socket management
- ✅ Easy to debug with curl/Postman
- ✅ CORS support for web-based tools

### 3. Why Port 3457?

- Unique port unlikely to conflict
- Easy to remember (345-7)
- Same approach as cclsp (uses stdio)

### 4. Why Not Modify smart_search?

User feedback: 
> "第一种跟当前的符号搜索没区别哎"  
> (Method 1 has no difference from current symbol search)

**Solution**: Implement real LSP server that connects to live language servers, not pre-indexed data.

---

## 🚀 Quick Start Guide

### Test VSCode Bridge Now

1. **Install Extension**:
   ```bash
   cd ccw-vscode-bridge
   npm install && npm run compile
   code --install-extension .
   ```

2. **Reload VSCode**:
   - Press `Cmd+Shift+P` (Mac) or `Ctrl+Shift+P` (Windows)
   - Type "Reload Window"

3. **Verify Bridge is Running**:
   ```bash
   curl http://localhost:3457/get_definition \
     -X POST \
     -H "Content-Type: application/json" \
     -d '{"file_path":"/path/to/file.ts","line":10,"character":5}'
   ```

4. **Test via CCW**:
   ```javascript
   // In Claude Code or MCP client
   await executeTool('vscode_lsp', {
     action: 'get_definition',
     file_path: '/absolute/path/to/file.ts',
     line: 10,
     character: 5
   });
   ```

---

## 📞 Support & Troubleshooting

### Common Issues

**Issue**: "Could not connect to VSCode Bridge"
**Solution**: 
1. Ensure VSCode is running
2. Check if extension is activated: `Cmd+Shift+P` → "CCW VSCode Bridge"
3. Verify port 3457 is not in use: `lsof -i :3457`

**Issue**: "No LSP server available"
**Solution**: Open the file in VSCode workspace first

**Issue**: "File not found"
**Solution**: Use absolute paths, not relative

---

## 📝 Change Log

### 2026-01-19 - Initial Implementation
- Created VSCode Bridge extension (5 files)
- Implemented vscode_lsp MCP tool
- Registered tool in CCW registry
- Completed planning documentation
- Added comprehensive architecture diagrams

---

**Document End**
