letX connector
Use letX inside Claude Code
One command connects Claude Code (and Codex, Cursor, or any MCP client) to your letX account.
Works with any MCP-capable tool: Claude Code, Codex CLI, Cursor, Windsurf, Gemini CLI.
- 1
Add the server
Run:
claude mcp add --transport http letx https://api.letx.app/mcp - 2
Sign in, or make an account
The first call opens your browser on letx.app. If you are not already signed in, this is where you land. Use Google or GitHub, or fill in the form. The free plan needs no card. Already have an account? Press Sign in at the top.
- 3
Allow access
letX then asks what to grant. The screen names whichever client you are connecting, so read it and press Allow access. Your client stores the token, never your password, and you can disconnect later from Settings → Connected Accounts.
- 4
Use it
Inside Claude Code: “compile this paper with letx and show me the errors”, “list my letX projects”, “push this LaTeX into a new letX project”.
What Claude Code can do with letX connected
- Compile LaTeX → PDF on a real TeX Live farm
- Search 300+ free templates
- Start projects from any template
- Read & edit your project files
- See compile errors and fix them itself
- Hand off to the letX editor anytime
Frequently asked questions
What about Codex or Cursor?
Same server, same URL. Codex: add letX under mcp_servers in config. Cursor/Windsurf: add it in MCP settings. Any client that speaks streamable-HTTP MCP with OAuth works.
Is it free?
Connecting is free for every letX account. Compiles use your letX plan’s quota, free accounts get a generous daily allowance, Pro is unlimited.
Why compile on letX instead of local TeX?
A full, always-current TeX Live without installing 5GB locally, identical output for every collaborator, and the compiled project is instantly shareable and editable at letx.app.