IDE Index MCP Server

A JetBrains IDE plugin that exposes an MCP (Model Context Protocol) server, enabling AI coding assistants like Claude, Codex, Cursor, and Windsurf to leverage the IDE's powerful indexing and refactoring capabilities.

Fully tested: IntelliJ IDEA, PyCharm, WebStorm, GoLand, RustRover, Android Studio, PhpStorm May work (untested): RubyMine, CLion, DataGrip

IDE Index MCP Server provides AI coding assistants with access to the IDE's powerful code intelligence features through the Model Context Protocol (MCP).

Features

Multi-Language Support Advanced tools work across multiple languages based on available plugins:

• Java & Kotlin - IntelliJ IDEA, Android Studio
• Python - PyCharm (all editions), IntelliJ with Python plugin
• JavaScript & TypeScript - WebStorm, IntelliJ Ultimate, PhpStorm
• Go - GoLand, IntelliJ IDEA Ultimate with Go plugin
• PHP - PhpStorm, IntelliJ Ultimate with PHP plugin
• Rust - RustRover, IntelliJ IDEA Ultimate with Rust plugin, CLion

Universal Tools (All JetBrains IDEs)

• Find References - Locate all usages of any symbol across the project
• Go to Definition - Navigate to symbol declarations
• Code Diagnostics - Access errors, warnings, and quick fixes
• Index Status - Check if code intelligence is ready
• Sync Files - Force sync VFS/PSI cache after external file changes
• Build Project - Trigger IDE build with structured error/warning output (disabled by default)
• Find Class - Fast class/interface search by name with camelCase matching
• Find File - Fast file search by name using IDE's file index
• Search Text - Text search using IDE's pre-built word index
• Read File - Read file content by path or qualified name, including library sources (disabled by default)
• Open File - Open a file in the editor with optional navigation (disabled by default)
• Get Active File - Get currently active editor file(s) with cursor position (disabled by default)

Extended Tools (Language-Aware) These tools activate based on installed language plugins:

• Type Hierarchy - Explore class inheritance chains
• Call Hierarchy - Trace method/function call relationships
• Find Implementations - Discover interface/abstract implementations
• Symbol Search - Find by name with fuzzy/camelCase matching (disabled by default)
• Find Super Methods - Navigate method override hierarchies
• File Structure - View hierarchical file structure like IDE's Structure view (disabled by default)

Refactoring Tools

• Rename Refactoring - Safe renaming with automatic related element renaming (getters/setters, overriding methods) - works across ALL languages, fully headless
• Reformat Code - Reformat using project code style with import optimization (disabled by default)
• Safe Delete - Remove code with usage checking (Java/Kotlin only)
• Java to Kotlin Conversion - Convert Java to Kotlin using Intellij's built-in converter (Java only)

Why Use This Plugin?

Unlike simple text-based code analysis, this plugin gives AI assistants access to:

• True semantic understanding through the IDE's AST and index
• Cross-project reference resolution that works across files and modules
• Multi-language support - automatically detects and uses language-specific handlers
• Safe refactoring operations with automatic reference updates and undo support

Perfect for AI-assisted development workflows where accuracy and safety matter.

Table of Contents

• Installation
• Quick Start
• Community Integrations
• Client Configuration
• Available Tools
• Multi-Project Support
• Tool Window
• Error Codes
• Requirements
• Contributing

Installation

Using the IDE built-in plugin system

Settings/Preferences > Plugins > Marketplace > Search for "IDE Index MCP Server" > Install

Using JetBrains Marketplace

Go to JetBrains Marketplace and install it by clicking the Install to ... button.

Manual Installation

Download the latest release and install it manually: Settings/Preferences > Plugins > ⚙️ > Install plugin from disk...

Quick Start

1. Install the plugin and restart your JetBrains IDE
2. Open a project - the MCP server starts automatically with IDE-specific defaults:
   • IntelliJ IDEA: intellij-index on port 29170
   • PyCharm: pycharm-index on port 29172
   • WebStorm: webstorm-index on port 29173
   • Other IDEs: See IDE-Specific Defaults
3. Configure your AI assistant using the "Install on Coding Agents" button (easiest) or manually
4. Use the tool window (bottom panel: "Index MCP Server") to copy configuration or monitor commands
5. Change port (optional): Click "Change port, disable tools" in the toolbar or go to Settings > Tools > Index MCP Server

Using the "Install on Coding Agents" Button

The easiest way to configure your AI assistant:

1. Open the "Index MCP Server" tool window (bottom panel)
2. Click the prominent "Install on Coding Agents" button on the right side of the toolbar
3. A popup appears with two sections:
   • Install Now - For Claude Code CLI and Codex CLI: Runs the installation command automatically
   • Copy Configuration - For other clients: Copies the JSON config to your clipboard
4. For "Copy Configuration" clients, paste the config into the appropriate config file

Community Integrations

• opencode-jetbrains-index - a third-party integration for OpenCode that uses this plugin

Disclaimer: This repository is not maintained by me. Please use its own issue tracker for integration-specific issues and support.

Client Configuration

Claude Code (CLI)

Use the "Install on Coding Agents" button in the tool window, or run this command (adjust name and port for your IDE):

# IntelliJ IDEA
claude mcp add --transport http intellij-index http://127.0.0.1:29170/index-mcp/streamable-http --scope user

# PyCharm
claude mcp add --transport http pycharm-index http://127.0.0.1:29172/index-mcp/streamable-http --scope user

# WebStorm
claude mcp add --transport http webstorm-index http://127.0.0.1:29173/index-mcp/streamable-http --scope user

Options:

• --scope user - Adds globally for all projects
• --scope project - Adds to current project only

To remove: claude mcp remove <server-name> (e.g., claude mcp remove intellij-index)

Codex CLI

Use the "Install on Coding Agents" button in the tool window, or run this command (adjust name and port for your IDE):

# IntelliJ IDEA
codex mcp add intellij-index --url http://127.0.0.1:29170/index-mcp/streamable-http

# PyCharm
codex mcp add pycharm-index --url http://127.0.0.1:29172/index-mcp/streamable-http

# WebStorm
codex mcp add webstorm-index --url http://127.0.0.1:29173/index-mcp/streamable-http

To remove: codex mcp remove <server-name> (e.g., codex mcp remove intellij-index)

Cursor

Add to .cursor/mcp.json in your project root or ~/.cursor/mcp.json globally (adjust name and port for your IDE):

{
  "mcpServers": {
    "intellij-index": {
      "url": "http://127.0.0.1:29170/index-mcp/streamable-http"
    }
  }
}

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json (adjust name and port for your IDE):

{
  "mcpServers": {
    "intellij-index": {
      "serverUrl": "http://127.0.0.1:29170/index-mcp/streamable-http"
    }
  }
}

VS Code (Generic MCP)

{
  "mcp.servers": {
    "intellij-index": {
      "url": "http://127.0.0.1:29170/index-mcp/streamable-http"
    }
  }
}

Note: Replace the server name and port with your IDE's defaults. See IDE-Specific Defaults below.

IDE-Specific Defaults

Each JetBrains IDE has a unique default port and server name to allow running multiple IDEs simultaneously without conflicts:

IDE	Server Name	Default Port
IntelliJ IDEA	intellij-index	29170
Android Studio	android-studio-index	29171
PyCharm	pycharm-index	29172
WebStorm	webstorm-index	29173
GoLand	goland-index	29174
PhpStorm	phpstorm-index	29175
RubyMine	rubymine-index	29176
CLion	clion-index	29177
RustRover	rustrover-index	29178
DataGrip	datagrip-index	29179

Tip: Use the "Install on Coding Agents" button in the tool window - it automatically uses the correct server name and port for your IDE.

Available Tools

The plugin provides 21 MCP tools organized by availability. Tools marked (disabled by default) can be enabled in Settings > Tools > Index MCP Server.

Universal Tools

These tools work in all supported JetBrains IDEs.

Tool	Description
ide_find_references	Find all references to a symbol across the entire project
ide_find_definition	Find the definition/declaration location of a symbol
ide_find_class	Search for classes/interfaces by name with camelCase/substring/wildcard matching
ide_find_file	Search for files by name using IDE's file index
ide_search_text	Text search using IDE's pre-built word index with context filtering
ide_diagnostics	Analyze file problems with fresh editor diagnostics for open files or public batch diagnostics for closed files, plus optional build/test results; intentions are best-effort
ide_index_status	Check if the IDE is in dumb mode or smart mode
ide_sync_files	Force sync IDE's virtual file system and PSI cache with external file changes
ide_build_project	Build project using IDE's build system (JPS, Gradle, Maven) with structured errors (disabled by default)
ide_read_file	Read file content by path or qualified name, including library/jar sources (disabled by default)
ide_get_active_file	Get the currently active file(s) in the editor with cursor position (disabled by default)
ide_open_file	Open a file in the editor with optional line/column navigation (disabled by default)
ide_refactor_rename	Rename a symbol and update all references across the project (all languages)
ide_move_file	Move a file to a new directory, applying language-aware reference/package updates when the IDE provides a semantic move backend
ide_reformat_code	Reformat code using project code style with import optimization (disabled by default)

Extended Tools (Language-Aware)

These tools activate based on available language plugins:

Tool	Description	Languages
ide_type_hierarchy	Get the complete type hierarchy (supertypes and subtypes)	Java, Kotlin, Python, JS/TS, Go, PHP, Rust
ide_call_hierarchy	Analyze method call relationships (callers or callees)	Java, Kotlin, Python, JS/TS, Go, PHP, Rust
ide_find_implementations	Find all implementations of an interface or abstract method	Java, Kotlin, Python, JS/TS, PHP, Rust
ide_find_symbol	Search for symbols (classes, methods, fields) by name with fuzzy/camelCase matching (disabled by default)	Java, Kotlin, Python, JS/TS, Go, PHP, Rust
ide_find_super_methods	Find the full inheritance hierarchy of methods that a method overrides/implements	Java, Kotlin, Python, JS/TS, PHP
ide_file_structure	Get hierarchical file structure (similar to IDE's Structure view) (disabled by default)	Java, Kotlin, Python, JS/TS

Java-Specific Refactoring Tools

Tool	Description
ide_convert_java_to_kotlin	Convert Java files to Kotlin using IntelliJ's built-in converter (disabled by default, requires Java + Kotlin plugins)
ide_refactor_safe_delete	Safely delete an element, checking for usages first (Java/Kotlin only)

Note: Refactoring tools modify source files. All changes support undo via Ctrl/Cmd+Z.

Tool Availability by IDE

Fully Tested:

IDE	Universal	Navigation	Refactoring
IntelliJ IDEA	✓ 14 tools	✓ 6 tools	✓ rename + reformat + safe delete + Java→Kotlin
Android Studio	✓ 14 tools	✓ 6 tools	✓ rename + reformat + safe delete + Java→Kotlin
PyCharm	✓ 14 tools	✓ 6 tools	✓ rename + reformat
WebStorm	✓ 14 tools	✓ 6 tools	✓ rename + reformat
GoLand	✓ 14 tools	✓ 4 tools	✓ rename + reformat
RustRover	✓ 14 tools	✓ 4 tools	✓ rename + reformat
PhpStorm	✓ 14 tools	✓ 5 tools	✓ rename + reformat

May Work (Untested):

IDE	Universal	Navigation	Refactoring
RubyMine	✓ 14 tools	-	✓ rename + reformat
CLion	✓ 14 tools	-	✓ rename + reformat
DataGrip	✓ 14 tools	-	✓ rename + reformat

Note: Navigation tools activate when language plugins are present. GoLand and RustRover have 4 navigation tools (no ide_find_implementations or ide_find_super_methods due to language semantics). PhpStorm has 5 (no ide_file_structure). The rename and reformat tools work across all languages. ide_convert_java_to_kotlin is available only in IntelliJ IDEA and Android Studio, requires both Java and Kotlin plugins, and is disabled by default.

For detailed tool documentation with parameters and examples, see USAGE.md.

Multi-Project Support

When multiple projects are open in a single IDE window, you must specify which project to use with the project_path parameter:

{
  "name": "ide_find_references",
  "arguments": {
    "project_path": "/Users/dev/myproject",
    "file": "src/Main.kt",
    "line": 10,
    "column": 5
  }
}

If project_path is omitted:

• Single project open: That project is used automatically
• Multiple projects open: An error is returned with the list of available projects

Workspace Projects

The plugin supports workspace projects where a single IDE window contains multiple sub-projects as modules with separate content roots. The project_path parameter accepts:

• The workspace root path
• A sub-project path (module content root)
• A subdirectory of any open project

When an error occurs, the response returns available_projects. By default this includes workspace sub-projects so AI agents can discover valid module content roots. If you want smaller error payloads, switch Project list in error responses to Compact in plugin settings to return only top-level project roots.

Tool Window

The plugin adds an "Index MCP Server" tool window (bottom panel) that shows:

• Server Status: Running indicator with server URL and port
• Project Name: Currently active project
• Command History: Log of all MCP tool calls with:
  • Timestamp
  • Tool name
  • Status (Success/Error/Pending)
  • Parameters and results (expandable)
  • Execution duration

Tool Window Actions

Action	Description
Refresh	Refresh server status and command history
Copy URL	Copy the MCP server URL to clipboard
Clear History	Clear the command history
Export History	Export history to JSON or CSV file
Install on Coding Agents	Install MCP server on AI assistants (prominent button on right)

Error Codes

JSON-RPC Standard Errors

Code	Name	Description
-32700	Parse Error	Failed to parse JSON-RPC request
-32600	Invalid Request	Invalid JSON-RPC request format
-32601	Method Not Found	Unknown method name
-32602	Invalid Params	Invalid or missing parameters
-32603	Internal Error	Unexpected internal error

Custom MCP Errors

Code	Name	Description
-32001	Index Not Ready	IDE is in dumb mode (indexing in progress)
-32002	File Not Found	Specified file does not exist
-32003	Symbol Not Found	No symbol found at the specified position
-32004	Refactoring Conflict	Refactoring cannot be completed (e.g., name conflict)

Settings

Configure the plugin at Settings > Tools > Index MCP Server:

Setting	Default	Description
Server Port	IDE-specific	MCP server port (range: 1024-65535, auto-restart on change). See IDE-Specific Defaults
Server Host	127.0.0.1	Listening host. Change to 0.0.0.0 for remote/WSL access
Max History Size	100	Maximum number of commands to keep in history
Project List in Error Responses	Expanded	Controls available_projects detail for invalid/missing project_path errors. Expanded includes workspace sub-projects; Compact returns only top-level project roots
Sync External Changes	false	Sync external file changes before operations (WARNING: significant performance impact)
Disabled Tools	7 tools	Per-tool enable/disable toggles. Some tools are disabled by default to keep the tool list focused

Requirements

• JetBrains IDE 2025.1 or later (any IDE based on IntelliJ Platform)
• JVM 21 or later
• MCP Protocol 2025-03-26 (primary Streamable HTTP), with 2024-11-05 legacy SSE compatibility

Supported IDEs

Fully Tested:

• IntelliJ IDEA (Community/Ultimate)
• Android Studio
• PyCharm (Community/Professional)
• WebStorm
• GoLand
• RustRover
• PhpStorm

May Work (Untested):

• RubyMine
• CLion
• DataGrip

The plugin uses standard IntelliJ Platform APIs and should work on any IntelliJ-based IDE, but has only been tested on the IDEs listed above.

Architecture

The plugin runs a custom embedded Ktor CIO HTTP server with dual MCP transports:

Streamable HTTP Transport (Primary, MCP 2025-03-26)

AI Assistant ──────► POST /index-mcp/streamable-http (initialize or request)
                     ◄── JSON-RPC response or HTTP 202 Accepted
             ──────► POST /index-mcp/streamable-http (follow-up requests/notifications)
                     ◄── JSON-RPC response or HTTP 202 Accepted

The plugin uses stateless Streamable HTTP for the primary MCP transport. It does not issue Mcp-Session-Id headers, does not require session resumption, and does not implement or advertise authentication capabilities.

Legacy SSE Transport (MCP Inspector, older clients)

AI Assistant ──────► GET /index-mcp/sse              (establish SSE stream)
                     ◄── event: endpoint             (receive POST URL with sessionId)
             ──────► POST /index-mcp?sessionId=x     (JSON-RPC requests)
                     ◄── HTTP 202 Accepted
                     ◄── event: message              (JSON-RPC response via SSE)

This dual approach:

• Primary MCP transport - Streamable HTTP per MCP 2025-03-26
• MCP Inspector compatible - Legacy SSE transport per MCP 2024-11-05
• Configurable port - IDE-specific default port, changeable in settings
• Works with any MCP-compatible client
• Single server instance across all open projects

Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Run tests: ./gradlew test
5. Submit a pull request

Development Setup

# Build the plugin
./gradlew build

# Run IDE with plugin installed
./gradlew runIde

# Run tests
./gradlew test

# Run plugin verification
./gradlew runPluginVerifier

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

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Plugin based on the IntelliJ Platform Plugin Template.