Leetcode MCP Server README

LeetCode MCP Server

The LeetCode MCP Server is a Model Context Protocol (MCP) server that provides seamless integration with LeetCode APIs, enabling advanced automation and intelligent interaction with LeetCode's programming problems, contests, solutions, and user data.

Features

• 🌐 Multi-site Support: Support​ both leetcode.com (Global) and leetcode.cn (China) platforms
• 🔌 Dual Transport Modes: Run as a stdio process (default) or as a Streamable HTTP server for web-based integrations
• 📊 Problem Data Retrieval: Obtain detailed problem descriptions, constraints, examples, official editorials, and ​user-submitted solutions
• 👤 User Data Access: Retrieve user profiles, submission history, and contest performance
• 🔒 ​Private Data Access: Create and query user notes, manage problem lists, track problem-solving progress, and analyze submission details (AC/WA analysis)
• 🔍 Advanced Search Capabilities: Filter problems by tags, difficulty levels, categories, and keywords
• 📅 Daily Challenge Access: Easily access daily challenge problems

Prerequisites

1. Node.js (v20.x or above)
2. (Optional) LeetCode session cookie for authenticated API access

Installation

# Install from npm
npm install @jinzcdev/leetcode-mcp-server -g

# Run with Global site configuration (stdio transport, default)
npx -y @jinzcdev/leetcode-mcp-server --site global

# Run with authentication (for accessing private data)
npx -y @jinzcdev/leetcode-mcp-server --site global --session <YOUR_LEETCODE_SESSION_COOKIE>

# Run as a Streamable HTTP server
npx -y @jinzcdev/leetcode-mcp-server --transport http --port 3000 --site global

Alternatively, you can clone the repository and run it locally:

# Clone the repository
git clone https://github.com/jinzcdev/leetcode-mcp-server.git

# Navigate to the project directory
cd leetcode-mcp-server

# Build the project
npm install && npm run build

# Run the server (stdio transport)
node build/index.js --site global

# Or run as a Streamable HTTP server
node build/index.js --transport http --port 3000 --site global

Usage

The server supports two transport modes:

Command-Line Options

MCP Client Configuration (stdio)

Add the following server entry to your MCP client configuration file:

Option 1: Using Environment Variables

{
  "mcpServers": {
    "leetcode": {
      "command": "npx",
      "args": ["-y", "@jinzcdev/leetcode-mcp-server"],
      "env": {
        "LEETCODE_SITE": "global",
        "LEETCODE_SESSION": "<YOUR_LEETCODE_SESSION_COOKIE>"
      }
    }
  }
}

Option 2: Using Command Line Arguments

{
  "mcpServers": {
    "leetcode": {
      "command": "npx",
      "args": [
        "-y",
        "@jinzcdev/leetcode-mcp-server",
        "--site",
        "global",
        "--session",
        "<YOUR_LEETCODE_SESSION_COOKIE>"
      ]
    }
  }
}

For LeetCode China site, modify the --site parameter to cn.

[!NOTE]

The exact configuration file location and JSON structure may vary by MCP client. Some clients use an mcp.servers wrapper or a type field — refer to your client's documentation and adapt the example accordingly.

MCP Client Configuration (Streamable HTTP)

First, start the server in HTTP mode:

npx -y @jinzcdev/leetcode-mcp-server --transport http --port 3000 --site global

Then connect your MCP client to the running server:

{
  "mcpServers": {
    "leetcode": {
      "type": "http",
      "url": "http://127.0.0.1:3000/mcp"
    }
  }
}

To use authenticated endpoints, pass the session cookie when starting the server:

npx -y @jinzcdev/leetcode-mcp-server --transport http --port 3000 --site global --session <YOUR_LEETCODE_SESSION_COOKIE>

[!NOTE] Some MCP clients use "type": "http" or "type": "streamableHttp" alongside the url field. Refer to your client's documentation for the exact HTTP transport configuration format.

[!TIP]

The server supports the following optional environment variables:

• LEETCODE_SITE: LeetCode API endpoint (global or cn, default: global)
• LEETCODE_SESSION: LeetCode session cookie for authenticated API access (default: empty)
• LEETCODE_TRANSPORT: Transport mode (stdio or http, default: stdio)
• LEETCODE_HTTP_PORT: HTTP server port when using Streamable HTTP (default: 3000)
• LEETCODE_HTTP_HOST: HTTP server host when using Streamable HTTP (default: 127.0.0.1)
• LEETCODE_HTTP_ENDPOINT: HTTP endpoint path when using Streamable HTTP (default: /mcp)

Priority Note: Command-line arguments take precedence over environment variables when both are specified. For example:

• If LEETCODE_SITE=cn is set but you run leetcode-mcp-server --site global, the server will use global.
• If LEETCODE_SESSION exists but you provide --session "new_cookie", the command-line session value will be used.

Available Tools

Problems

Users

Submissions

Notes

Problem Lists

Solutions

Tool Parameters

Problems

• get_daily_challenge - Retrieves today's LeetCode Daily Challenge problem with complete details

  • No parameters required

• get_problem - Retrieves details about a specific LeetCode problem

  • titleSlug: The URL slug/identifier of the problem (string, required)

• search_problems - Searches for LeetCode problems based on multiple filter criteria

  • category: Problem category filter (string, optional, default: "all-code-essentials")
  • tags: List of topic tags to filter problems by (string[], optional)
  • difficulty: Problem difficulty level filter (enum: "EASY", "MEDIUM", "HARD", optional)
  • searchKeywords: Keywords to search in problem titles and descriptions (string, optional)
  • limit: Maximum number of problems to return (number, optional, default: 10)
  • offset: Number of problems to skip (number, optional)

Users

• get_user_profile - Retrieves profile information about a LeetCode user

  • username: LeetCode username (string, required)

• get_user_contest_ranking - Retrieves a user's contest ranking information

  • username: LeetCode username (string, required)
  • attended: Whether to include only the contests the user has participated in (boolean, optional, default: true)

• get_recent_submissions - Retrieves a user's recent submissions on LeetCode Global

  • username: LeetCode username (string, required)
  • limit: Maximum number of submissions to return (number, optional, default: 10)

• get_recent_ac_submissions - Retrieves a user's recent accepted submissions

  • username: LeetCode username (string, required)
  • limit: Maximum number of submissions to return (number, optional, default: 10)

• get_user_status - Retrieves the current user's status

  • No parameters required

• get_problem_submission_report - Retrieves detailed information about a specific submission

  • id: The numerical submission ID (number, required)

• get_problem_progress - Retrieves the current user's problem-solving progress

  • offset: Number of questions to skip (number, optional, default: 0)
  • limit: Maximum number of questions to return (number, optional, default: 100)
  • questionStatus: Filter by question status (enum: "ATTEMPTED", "SOLVED", optional)
  • difficulty: Filter by difficulty levels (string[], optional)

• get_all_submissions - Retrieves paginated list of user's submissions

  • limit: Maximum number of submissions to return (number, default: 20)
  • offset: Number of submissions to skip (number, default: 0)
  • questionSlug: Optional problem identifier (string, optional)
  • lang: Programming language filter (string, optional, CN only)
  • status: Submission status filter (enum: "AC", "WA", optional, CN only)
  • lastKey: Pagination token for retrieving next page (string, optional, CN only)

Submissions

• run_code - Runs code for a specific problem and waits until finished (requires authentication)

  • titleSlug: The URL slug/identifier of the problem (string, required)
  • lang: Programming language (string enum, required)
  • typedCode: Source code to run (string, required)
  • dataInput: Custom input to run (string, optional)
  • timeoutMs: Polling timeout in milliseconds (number, optional, default: 120000)
  • pollIntervalMs: Polling interval in milliseconds (number, optional, default: 1500)

• submit_solution - Submits code for a specific problem and waits until finished (requires authentication)

  • titleSlug: The URL slug/identifier of the problem (string, required)
  • lang: Programming language (string enum, required)
  • typedCode: Source code to submit (string, required)
  • timeoutMs: Polling timeout in milliseconds (number, optional, default: 120000)
  • pollIntervalMs: Polling interval in milliseconds (number, optional, default: 1500)

Notes

• search_notes - Searches for user notes on LeetCode China

  • keyword: Search term to filter notes (string, optional)
  • limit: Maximum number of notes to return (number, optional, default: 10)
  • skip: Number of notes to skip (number, optional, default: 0)
  • orderBy: Sort order for returned notes (enum: "ASCENDING", "DESCENDING", optional, default: "DESCENDING")

• get_note - Retrieves user notes for a specific LeetCode problem

  • questionId: The question ID of the LeetCode problem (string, required)
  • limit: Maximum number of notes to return (number, optional, default: 10)
  • skip: Number of notes to skip (number, optional, default: 0)

• create_note - Creates a new note for a specific LeetCode problem

  • questionId: The question ID of the LeetCode problem (string, required)
  • content: The content of the note, supports markdown format (string, required)
  • summary: An optional short summary or title for the note (string, optional)

• update_note - Updates an existing note with new content or summary

  • noteId: The ID of the note to update (string, required)
  • content: The new content for the note, supports markdown format (string, required)
  • summary: An optional new short summary or title for the note (string, optional)

Problem Lists

Problem lists are identified by their favoriteSlug, the path segment after /problem-list/ in the list URL.

• list_problem_lists - Lists the current user's problem lists

  • includeCollected: Also return lists saved from other creators (boolean, optional, default: false)

• get_problem_list - Retrieves a problem list's metadata and a page of its questions

  • favoriteSlug: The slug of the problem list (string, required)
  • limit: Maximum number of questions to return (number, optional, default: 50)
  • skip: Number of questions to skip (number, optional, default: 0)
  • searchKeyword: Keyword to filter questions by title (string, optional)
  • sortField: Sort field: CUSTOM (the order shown on the website), FRONTEND_ID, DIFFICULTY, AC_RATE, FREQUENCY or CONTEST_POINT (string, optional, default: CUSTOM)
  • sortOrder: ASCENDING or DESCENDING (string, optional, default: ASCENDING)

• create_problem_list - Creates a new problem list

  • name: Display name of the list (string, required)
  • description: Description of the list (string, optional, default: "")
  • isPublic: Whether the list is publicly visible (boolean, optional, default: false)
  • questionSlugs: Problem slugs to add right after creation (string[], optional)
  • questionIds: Problem numbers to add right after creation, e.g. [1, 1143]; numbers that cannot be resolved are returned in unresolved ((string | number)[], optional)

• update_problem_list - Renames a problem list, changes its description or toggles its visibility (at least one optional field is required)

  • favoriteSlug: The slug of the problem list (string, required)
  • name: New display name (string, optional)
  • description: New description (string, optional)
  • isPublic: New visibility (boolean, optional)

• add_problems_to_list - Adds problems to a problem list (at least one of questionSlugs / questionIds is required; problems are appended in the given order, slugs first)

  • favoriteSlug: The slug of the problem list (string, required)
  • questionSlugs: Problem slugs to add, e.g. ["two-sum"] (string[], optional)
  • questionIds: Problem numbers to add, e.g. [1, 1143] or ["LCP 82"]; numbers that cannot be resolved are returned in unresolved ((string | number)[], optional)

• remove_problems_from_list - Removes problems from a problem list

  • favoriteSlug: The slug of the problem list (string, required)
  • questionSlugs: Problem slugs to remove (string[], required)

• reorder_problem_list - Reorders the problems inside a problem list (exactly one of sortField / questionSlugs is required; one problem is moved per request)

  • favoriteSlug: The slug of the problem list (string, required)
  • sortField: Sort the whole list by FRONTEND_ID, DIFFICULTY, AC_RATE, FREQUENCY or CONTEST_POINT (string, optional)
  • sortOrder: ASCENDING or DESCENDING (string, optional, default: ASCENDING)
  • questionSlugs: Problem slugs to move to the top, in this order; the remaining problems keep their relative order (string[], optional)

Solutions

• list_problem_solutions - Retrieves a list of community solutions for a specific problem

  • questionSlug: The URL slug/identifier of the problem (string, required)
  • limit: Maximum number of solutions to return (number, optional, default: 10)
  • skip: Number of solutions to skip (number, optional)
  • userInput: Search term to filter solutions (string, optional)
  • tagSlugs: Array of tag identifiers to filter solutions (string[], optional, default: [])
  • orderBy: Sorting criteria for the returned solutions
    • Global: enum: "HOT", "MOST_RECENT", "MOST_VOTES", optional, default: "HOT"
    • CN: enum: "DEFAULT", "MOST_UPVOTE", "HOT", "NEWEST_TO_OLDEST", "OLDEST_TO_NEWEST", optional, default: "DEFAULT"

• get_problem_solution - Retrieves the complete content of a specific solution

  • topicId: Unique topic ID of the solution (string, required, Global only)
  • slug: Unique slug/identifier of the solution (string, required, CN only)

Available Resources

Resource URIs

• problem-categories - A list of all problem classification categories

  • URI: categories://problems/all

• problem-tags - A detailed collection of algorithmic and data structure tags

  • URI: tags://problems/all

• problem-langs - A complete list of all programming languages supported by LeetCode

  • URI: langs://problems/all

• problem-detail - Provides details about a specific LeetCode problem

  • URI: problem://{titleSlug}
  • Parameters:
    • titleSlug: Problem identifier as it appears in the LeetCode URL

• problem-solution - Provides the complete content of a specific solution

  • Global URI: solution://{topicId}
    • Parameters:
      • topicId: Unique topic ID of the solution
  • CN URI: solution://{slug}
    • Parameters:
      • slug: Unique slug/identifier of the solution

Authentication

User-specific data access requires LeetCode session authentication:

1. Log in to LeetCode (Global or China site)
2. Extract LEETCODE_SESSION cookie from browser developer tools
3. Configure server with --session flag or LEETCODE_SESSION environment variable

Response Format

All tools return JSON-formatted responses with the following structure:

{
  "content": [
    {
      "type": "text",
      "text": "JSON_DATA_STRING"
    }
  ]
}

The JSON_DATA_STRING contains either the requested data or an error message for failed requests.

License

This project is licensed under the MIT License.