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TypeScript MCP

by mizchi
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TypeScript
MIT License
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lsmcp - Language Service Protocol MCP

A unified MCP (Model Context Protocol) server that provides advanced code manipulation and analysis capabilities for multiple programming languages through Language Server Protocol integration.

  • 🌍 Multi-Language Support
  • 🔍 Semantic Code Analysis
  • 🤖 AI-Optimized

See examples/ for working examples of each supported language configuration.

Requirements

  • Node.js 22.0.0 or higher (required for built-in SQLite support)

Quick Start

# tsgo (reccommended) npm add -D @mizchi/lsmcp @typescript/native-preview npx @mizchi/lsmcp init -p tsgo claude mcp add lsmcp npx -- -y @mizchi/lsmcp -p tsgo # with manual --bin claude mcp add lsmcp npx -- -y @mizchi/lsmcp --bin="<lsp-command>"

🎯 Core Flow: Overview → Search → Details

1. get_project_overview # Understand the codebase 2. search_symbols # Find what you need 3. get_symbol_details # Deep dive into symbols

📋 When to Use Each Tool

Initial Exploration:

  • get_project_overview - First tool to understand any codebase
  • list_dir - Browse directory structure
  • get_symbols_overview - High-level view of file symbols

Finding Code:

  • search_symbols - Primary search for functions, classes, interfaces
  • lsp_get_document_symbols - List all symbols in a specific file
  • lsp_get_workspace_symbols - Alternative workspace-wide search

Understanding Code:

  • get_symbol_details - Complete information in one call (recommended)
  • lsp_get_definitions - Jump to definition (use includeBody: true for full code)
  • lsp_find_references - Find all usages
  • lsp_get_hover - Quick type information

Code Quality:

  • lsp_get_diagnostics - Check for errors
  • lsp_get_code_actions - Get available fixes

Code Modification:

  • lsp_rename_symbol - Safe renaming across codebase
  • lsp_format_document - Format code
  • replace_range / replace_regex - Text replacements

Example Workflows

1. EXPLORING A NEW CODEBASE

1. mcp__lsmcp__get_project_overview → Understand structure, main components, statistics 2. mcp__lsmcp__search_symbols --kind "class" → Find all classes in the project 3. mcp__lsmcp__get_symbol_details --symbol "MainClass" → Deep dive into specific class implementation

2. INVESTIGATING A BUG

1. mcp__lsmcp__search_symbols --name "problematicFunction" → Locate the function 2. mcp__lsmcp__get_symbol_details --symbol "problematicFunction" → Understand its type, implementation, and usage 3. mcp__lsmcp__lsp_find_references --symbolName "problematicFunction" → See all places it's called 4. mcp__lsmcp__lsp_get_diagnostics --relativePath "path/to/file.ts" → Check for errors

3. REFACTORING CODE

1. mcp__lsmcp__search_symbols --name "oldMethodName" → Find the method to refactor 2. mcp__lsmcp__get_symbol_details --symbol "oldMethodName" → Understand current implementation and usage 3. mcp__lsmcp__lsp_rename_symbol --symbolName "oldMethodName" --newName "newMethodName" → Safely rename across codebase 4. mcp__lsmcp__lsp_format_document --relativePath "path/to/file.ts" → Clean up formatting

4. ADDING NEW FEATURES

1. mcp__lsmcp__get_project_overview → Understand existing architecture 2. mcp__lsmcp__search_symbols --kind "interface" → Find relevant interfaces to implement 3. mcp__lsmcp__get_symbol_details --symbol "IUserService" → Understand interface requirements 4. mcp__lsmcp__lsp_get_completion --line 50 → Get suggestions while writing new code

FALLBACK TOOLS (USE ONLY WHEN NECESSARY):

  • ⚠️ Read - Only when you need to see non-code files or LSMCP tools fail
  • ⚠️ Grep - For text pattern searches in files
  • ⚠️ Glob - Only when LSMCP file finding doesn't work
  • ⚠️ LS - Only for basic directory listing when LSMCP fails
  • ⚠️ Bash commands - Only for non-code operations or troubleshooting

WHEN TO USE FALLBACK TOOLS

Use standard tools ONLY in these situations:

  1. Non-code files: README, documentation, configuration files
  2. LSMCP tool failures: When LSMCP tools return errors or no results
  3. Debugging: When troubleshooting why LSMCP tools aren't working
  4. Special file formats: Files that LSMCP doesn't support
  5. Quick verification: Double-checking LSMCP results when needed

Memory System

You have access to project memories stored in .lsmcp/memories/. Use these tools:

  • mcp__lsmcp__list_memories - List available memory files
  • mcp__lsmcp__read_memory - Read specific memory content
  • mcp__lsmcp__write_memory - Create or update memories
  • mcp__lsmcp__delete_memory - Delete a memory file

Memories contain important project context, conventions, and guidelines that help maintain consistency.

Available Presets

lsmcp includes built-in presets for popular language servers:

  • tsgo - TypeScript (Recommended)
  • typescript - typescript-language-server
  • rust-analyzer - Rust Analyser
  • moonbit - MoonBit
  • fsharp - F# (fsautocomplete)
  • deno - Deno TypeScript/JavaScript
  • gopls - Go (Official Go language server)
  • hls - Haskell Language Server (requires ghcup setup, see docs/HASKELL_SETUP.md)
  • ocaml - OCaml Language Server

Configuration

.lsmcp/config.json

{ "$schema": "../node_modules/@mizchi/lsmcp/lsmcp.schema.json", "preset": "tsgo", "settings": { "autoIndex": true, "indexConcurrency": 10 } }

For a comprehensive configuration example, see examples/full-lsmcp-config.json.

Tools

lsmcp provides comprehensive MCP tools for code analysis and manipulation:

Note: Tool names listed below are the raw MCP tool names (snake_case, e.g. get_hover). Some clients display them with a server-qualified prefix (e.g. mcplsmcpget_hover). For naming conventions and module boundaries, see docs/TOOL_REFERENCE.md.

Core LSP Tools

  • lsp_get_hover - Get type information and documentation for symbols
  • lsp_find_references - Find all references to a symbol across the codebase
  • lsp_get_definitions - Navigate to symbol definitions with optional code body
  • lsp_get_diagnostics - Check for errors and warnings in files
  • lsp_get_all_diagnostics - Get diagnostics for entire project
  • lsp_get_document_symbols - List all symbols in a file
  • lsp_get_workspace_symbols - Search symbols across the entire workspace
  • lsp_get_completion - Get code completion suggestions
  • lsp_get_signature_help - Get parameter hints for function calls
  • lsp_format_document - Format entire documents using language server
  • lsp_rename_symbol - Rename symbols across the codebase
  • lsp_get_code_actions - Get available quick fixes and refactorings
  • lsp_delete_symbol - Delete a symbol and optionally all its references
  • lsp_check_capabilities - Check supported LSP features

High-Level Tools

  • get_project_overview - Quick project structure and component analysis
  • search_symbols - Fast symbol search using pre-built index (auto-creates index if needed)
  • get_symbol_details - Get comprehensive details about a symbol (hover, definition, references)

External Library Tools

  • index_external_libraries - Index TypeScript declaration files from node_modules
  • get_typescript_dependencies - List available TypeScript dependencies
  • search_external_library_symbols - Search symbols in indexed external libraries
  • resolve_symbol - Resolve symbols to their definitions in external libraries
  • get_available_external_symbols - Get symbols available from imported libraries
  • parse_imports - Parse and analyze import statements

Code Editing Tools

  • replace_range - Replace specific text ranges in files
  • replace_regex - Advanced regex-based replacements

File System Tools

  • list_dir - List directories with gitignore support
  • get_symbols_overview - High-level symbol overview by file

Memory Management

  • list_memories - List project memories
  • read_memory - Read specific memory content
  • write_memory - Create or update memories
  • delete_memory - Remove memories

Performance Optimization

LSMCP includes several performance optimizations:

  • Incremental Indexing: Only modified files are re-indexed
  • Memory Monitoring: Automatic garbage collection when memory usage is high
  • Batch Processing: Efficient concurrent file processing
  • Smart Caching: 15-minute cache for frequently accessed data

Configuration options in .lsmcp/config.json:

{ "indexConcurrency": 5, "maxFileSize": 10485760, "enableWatchers": true, "memoryLimit": 1024 }

Development

See CONTRIBUTING.md for detailed development setup, testing instructions, and contribution guidelines.

# Quick start pnpm install pnpm build pnpm test # Run with memory monitoring node --expose-gc dist/lsmcp.js

Debug Logging

LSMCP has separate logging systems for MCP server and LSP client that can be controlled independently:

MCP Server Logging

Enable MCP server debug output with either environment variable:

MCP_DEBUG=1 lsmcp # Enable MCP server debug logging LSMCP_DEBUG=1 lsmcp # Alternative (backward compatible)
LSP Client Logging

Enable LSP client debug output separately:

LSP_DEBUG=1 lsmcp # Enable LSP client debug logging
Combined Logging

Enable both MCP and LSP debug output:

MCP_DEBUG=1 LSP_DEBUG=1 lsmcp

License

MIT - See LICENSE file for details.

Deploy Server
A
security – no known vulnerabilities
A
license - permissive license
A
quality - confirmed to work

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Tools

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A specialized server that provides advanced TypeScript code manipulation and analysis capabilities, enabling refactoring, navigation, diagnostics, and module analysis through Claude.

  1. Requirements
    1. Quick Start
      1. RECOMMENDED WORKFLOW
        1. 🎯 Core Flow: Overview → Search → Details
        2. 📋 When to Use Each Tool
        3. Example Workflows
        4. WHEN TO USE FALLBACK TOOLS
      2. Memory System
        1. Available Presets
          1. Configuration
        2. Tools
          1. Core LSP Tools
          2. High-Level Tools
          3. External Library Tools
          4. Code Editing Tools
          5. File System Tools
          6. Memory Management
        3. Performance Optimization
          1. Development
            1. Debug Logging
          2. License

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