Claude-Code-Workflow/codex-lens/docs/IMPLEMENTATION_SUMMARY.md

CodexLens Real LSP Implementation - Summary

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

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✅ 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

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📋 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

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

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🎯 Next Steps

Immediate Actions (Phase 1)

1. Test VSCode Bridge

   cd ccw-vscode-bridge
   npm install
   npm run compile
   # Press F5 in VSCode to launch extension
   

2. Test vscode_lsp Tool

   # 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

# 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]"

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📖 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

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💡 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.

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🚀 Quick Start Guide

Test VSCode Bridge Now

1. Install Extension:

   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:

   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:

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

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📞 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

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📝 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

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Document End