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. Needs a paid letX plan: Pro, Academic Pro, or a seat on a Team.
Pro is $18 a month, Academic Pro $9 a month for verified students, faculty and staff, and a Team seat $20 a month. See the plans
- 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 to letX, this is where you land. Use Google or GitHub, or fill in the form. Already have an account? Press Sign in at the top. Connecting needs a paid letX plan (Pro, Academic Pro, or a seat on a Team); on a free account the next screen says so and links to the plans.
- 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 apps.
- 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 1000+ free LaTeX 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.
Do I need a paid plan?
On letX, yes. Connecting Claude Code is part of letX’s paid plans (Pro, Academic Pro, or a seat on a Team). A free account is stopped at the consent screen with a link to the plans. Compiles that Claude Code runs count against your letX plan like any other.
I already connected letX in claude.ai. Do I add it again?
Usually not. Connectors you add in claude.ai are available in Claude Code when you sign in to Claude Code with the same Claude account.
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.