LeetCode MCP Connector for Claude.ai

A remote MCP server that gives Claude access to your LeetCode submission history and weak area analysis.

Tools provided

Tool	Description
get_submission_history	Recent submissions with status, language, and multi-attempt detection
analyze_weak_areas	Topic-by-topic breakdown of weakest vs strongest areas with recommendations
get_user_stats	Overall accepted/submission counts, streaks, and ranking percentile
get_daily_challenge	Today's daily challenge problem

Setup

1. Install & run locally

npm install
npm start
# → Listening on http://localhost:3000

2. Deploy (required for Claude.ai)

Claude.ai requires a publicly accessible HTTPS URL. Choose one:

Option A — Railway (easiest, free tier)

1. Push this folder to a GitHub repo
2. Go to railway.app → New Project → Deploy from GitHub
3. Railway auto-detects Node.js and gives you a public URL like https://leetcode-mcp-xxx.railway.app

Option B — Render

1. Push to GitHub
2. render.com → New Web Service → connect repo
3. Build: npm install, Start: node server.js
4. Gets a URL like https://leetcode-mcp.onrender.com

Option C — Docker (any VPS/cloud)

docker build -t leetcode-mcp .
docker run -p 3000:3000 leetcode-mcp
# Then point a domain + SSL at port 3000

Option D — Cloudflare Workers (advanced)

Cloudflare has built-in MCP support. See: https://developers.cloudflare.com/mcp/

3. Add to Claude.ai

Once deployed:

1. Go to Claude.ai → Settings → Connectors
2. Click "Add custom connector"
3. Enter your server URL: https://your-deployment-url.com/mcp
4. Click Add

That's it — Claude will now have access to the LeetCode tools.

Example prompts

After connecting, try asking Claude:

• "Analyze my weak areas on LeetCode — my username is @john_doe"
• "Show me my last 20 submissions and tell me which problems I struggled with"
• "What are my LeetCode stats and what should I focus on next?"
• "What's today's daily challenge?"

Notes on LeetCode's API

• Public data: get_submission_history, get_user_stats, analyze_weak_areas, and get_daily_challenge all work with public profile data — no login required, as long as the target profile is public.
• Private profiles: If a user has a private profile, LeetCode will return empty data. The user must set their profile to public in LeetCode Settings → Privacy.
• LeetCode does not have an official public API. This server uses the same GraphQL endpoint that LeetCode's own frontend uses. It may break if LeetCode changes their API structure.

Extending this server

To add more tools, follow the pattern in server.js:

server.tool("tool_name", "description", { param: z.string() }, async ({ param }) => {
  // call lcQuery() and return results
  return { content: [{ type: "text", text: "..." }] };
});

Useful queries to add:

• Problem search by tag/difficulty (uses problemsetQuestionList query)
• Company-tagged problems (requires LeetCode Premium session cookie)
• Contest history (query is already in the file as CONTEST_HISTORY_QUERY)