ts-graph-mcp

A TypeScript code graph tool that extracts code structure into a queryable database, with MCP integration for AI coding agents.

What It Does

ts-graph parses TypeScript source code using AST analysis and builds a graph database of your codebase structure. The graph captures code symbols (functions, classes, interfaces, types, variables) and their relationships (calls, imports, type usage, inheritance).

AI agents can query the graph through 3 MCP tools to:

• Traverse call graphs (who calls this? what does this call?)
• Analyze code impact (what breaks if I change this?)
• Find paths between symbols

Quick Start

1. Configuration

Create ts-graph-mcp.config.json in your project root:

{
  "packages": [
    { "name": "main", "tsconfig": "./tsconfig.json" }
  ],
  "server": {
    "port": 4000
  }
}

For monorepos, list multiple packages:

{
  "packages": [
    { "name": "shared", "tsconfig": "./shared/tsconfig.json" },
    { "name": "frontend", "tsconfig": "./frontend/tsconfig.json" },
    { "name": "backend", "tsconfig": "./backend/tsconfig.json" }
  ],
  "server": {
    "port": 4000
  }
}

2. Start the HTTP Server

npx ts-graph-mcp

The server indexes your project on first run and watches for changes.

3. Configure Claude Code

claude mcp add ts-graph-mcp -- npx -y ts-graph-mcp --mcp

Or manually in .mcp.json:

{
  "mcpServers": {
    "ts-graph-mcp": {
      "command": "npx",
      "args": ["-y", "ts-graph-mcp", "--mcp"]
    }
  }
}

Note: Start the HTTP server first. The MCP wrapper connects to it.

MCP Tools

All tools use symbol to reference code elements. The file_path parameter is optional — when omitted, the tool searches across all packages.

dependenciesOf

Find all code that a symbol depends on (forward dependencies).

// What does handleRequest call?
{ file_path: "src/api.ts", symbol: "handleRequest" }

// Or without file_path (auto-resolves if unique)
{ symbol: "handleRequest" }

dependentsOf

Find all code that depends on a symbol (reverse dependencies).

// Who calls saveUser?
{ file_path: "src/db/user.ts", symbol: "saveUser" }

pathsBetween

Find how two symbols connect through the code graph.

// How does handleRequest reach saveData?
{
  from: { file_path: "src/api.ts", symbol: "handleRequest" },
  to: { file_path: "src/db.ts", symbol: "saveData" }
}

Symbol Resolution

• Method names work without class prefix: save resolves to UserService.save if unique
• Multiple matches return a disambiguation list with file paths
• Single match auto-resolves and proceeds

Parameters

| Parameter | Required | Description | |-----------|----------|-------------| | symbol | Yes | Symbol name (function, class, method, etc.) | | file_path | No | File containing the symbol. Auto-resolves if unique. | | max_nodes | No | Output limit (default: 50). Larger graphs truncate. |

Example Output

## Graph

handleRequest --CALLS--> validate --CALLS--> saveUser

## Nodes

validate:
  type: Function
  file: src/service.ts
  offset: 10, limit: 5
  snippet:
    10: export function validate(data: Input) {
  > 11:   return saveUser(data);
    12: }

saveUser:
  type: Function
  file: src/db/user.ts
  offset: 3, limit: 4
  snippet:
    3: export function saveUser(data: Input) {
    4:   return db.insert(data);
    5: }

CLI Options

ts-graph-mcp              # Start HTTP server
ts-graph-mcp --mcp        # Start MCP stdio server
ts-graph-mcp --reindex    # Force clean reindex

Configuration Reference

Required

| Field | Description | |-------|-------------| | packages | Array of { name, tsconfig } | | server.port | HTTP server port (no default) |

Optional

| Field | Description | Default | |-------|-------------|---------| | storage.type | Database type | "sqlite" | | storage.path | Database file path | .ts-graph-mcp/graph.db | | watch.debounce | Enable debouncing | true | | watch.debounceInterval | Debounce delay (ms) | 300 | | watch.polling | Use polling (for Docker/WSL2) | false | | watch.pollingInterval | Polling interval (ms) | 1000 | | watch.excludeDirectories | Directories to skip | [] | | watch.silent | Suppress reindex logs | false |

Add .ts-graph-mcp/ to your .gitignore.

Yarn PnP Support

ts-graph works with Yarn 4 PnP monorepos. When .pnp.cjs is detected, module resolution uses Yarn's PnP API.

Requirements:

• Use base package imports (@libs/utils, not @libs/utils/date)
• Declare dependencies with workspace:* protocol

Supported Types

Nodes: Function, Class, Method, Interface, TypeAlias, Variable, File, Property

Edges: CALLS, IMPORTS, CONTAINS, IMPLEMENTS, EXTENDS, USES_TYPE, REFERENCES, INCLUDES

Development

npm run check        # Run tests, build, and lint
npm test             # Run tests
npm run build        # Compile TypeScript

Project Structure

ts-graph-mcp/
├── http/          # HTTP server, database, ingestion, queries
├── mcp/           # MCP stdio wrapper
├── shared/        # Shared types
├── ui/            # Web UI (React + Vite)
└── main.ts        # Entry point

Windows Users

This package uses better-sqlite3, which requires compilation tools:

1. Install Visual Studio Build Tools with "Desktop development with C++"
2. Install Python 3.x
3. Use Node.js LTS

Contributing

See ARCHITECTURE.md for technical internals and CLAUDE.md for code style guidelines.

License

MIT