LeetCode Gateway

Connect Claude Code to LeetCode for accessing problem descriptions, user statistics, and contest information through the Model Context Protocol.

When to Use This MCP Server

Connect this server when you need to:

• Retrieve LeetCode problem descriptions, constraints, and example test cases directly in Claude Code for algorithm practice and solution development
• Access your LeetCode profile statistics, submission history, and progress tracking without switching to the LeetCode website
• Browse contest information, problem sets, and difficulty distributions for structured coding practice sessions

Consider alternatives when:

• You need to submit solutions to LeetCode, which requires the LeetCode website or its official browser-based IDE
• You want competitive programming practice across multiple platforms (Codeforces, HackerRank, etc.), where a multi-platform solution is needed

Quick Start

Configuration

Copy
name: leetcode-gateway
type: mcp
category: devtools

Example Connection

Copy
claude mcp:connect leetcode-gateway

Available Tools

get-problem:         Retrieve a problem's description, constraints, examples, and metadata
list-problems:       Browse problems with filters for difficulty, topic, and completion status
get-user-stats:      Access user profile statistics including solve counts and streaks
get-contest:         Retrieve contest information including problems and rankings
search-problems:     Search problems by keyword, tag, or company affiliation

Core Concepts

LeetCode MCP Server Overview

Aspect	Details
Transport	stdio-based process running mcp-server-leetcode binary
Authentication	Optional LeetCode session cookie for accessing user-specific data
Problem Database	Access to 3000+ coding problems with descriptions and test cases
Categorization	Problems organized by difficulty, topic tags, and company frequency
Contest Data	Weekly and biweekly contest problems, rankings, and historical results

LeetCode MCP Architecture

Claude Code IDE
    |
    v
[MCP Client] --stdio--> [mcp-server-leetcode]
                              |
                              v
                     [LeetCode GraphQL API]
                              |
                    +---------+---------+
                    |         |         |
                    v         v         v
              [Problems  [User      [Contest
               Database]  Profile]   Data]
                    \         |         /
                     [LeetCode Platform]
                   3000+ Problems | Rankings

Configuration

Parameter	Type	Default	Description
leetcode_session	string	optional	LeetCode session cookie for authenticated user data access
default_difficulty	string	all	Default difficulty filter: easy, medium, hard, or all
default_language	string	python3	Default programming language for code snippets and templates
include_premium	boolean	false	Include LeetCode Premium problems in listings and searches
results_per_page	integer	20	Number of problems to return per listing or search query

Best Practices

1. Filter by Topic Tags for Focused Practice - Use search-problems with specific topic tags (dynamic-programming, binary-search, graph) to focus your practice on areas that need improvement rather than randomly browsing all problems.

2. Start with Problem Constraints - Before coding a solution, carefully review the constraints section from get-problem. Constraints determine the expected time complexity, which directly influences which algorithms and data structures are viable.

3. Use Difficulty Progression - Set default_difficulty to easy when starting a new topic, then progress to medium and hard as you build confidence. This graduated approach builds foundational understanding before tackling complex variations.

4. Track Progress with User Stats - Periodically check get-user-stats to monitor your solve count across difficulties and identify topics with low completion rates. Data-driven practice prioritization is more effective than random problem selection.

5. Review Company-Tagged Problems - When preparing for technical interviews, use search-problems to find problems frequently asked by specific companies. Company tags reflect recent interview trends and help focus preparation efforts.

Common Issues

1. User Stats Unavailable Without Authentication - User-specific data (submissions, progress, streaks) requires a valid leetcode_session cookie. Extract the LEETCODE_SESSION cookie from your browser after logging in to LeetCode.

2. Premium Problems Return Access Denied - LeetCode Premium problems are behind a paywall. Set include_premium to false to avoid listing problems you cannot access, or provide a session cookie from a Premium account.

3. Problem Content Truncated or Formatted Oddly - LeetCode problems contain HTML formatting that may not render perfectly in plain text. The MCP server converts HTML to readable text, but complex diagrams or tables may lose their visual structure in the conversion.