AtCoder MCP Server for Claude.ai

io.github.ketherworks/atcoder

Search AtCoder problems and fetch public problem statements through MCP.

client:Claude.ai transport:streamable-http tools:4

Install AtCoder MCP Server in Claude.ai

Settings → Connectors → Add custom connector

https://api.ksrnyx.top/oj-mcp/atcoder/mcp

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

What Claude.ai can do once it is connected

oj_capabilities
oj_health
oj_fetch_problem
oj_search_problems

AtCoder MCP Server in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

AtCoder MCP Server MCP server