Yes, Letx Plugin is free to use.

How do I install Letx Plugin?

Letx Plugin is a remote plugin. You do not need to install anything locally. Add the server URL to your AI app's MCP configuration and you are ready to go.

Is Letx Plugin safe to use?

Yes. Letx Plugin passed MCP Marketplace's automated security scan with a score of 10/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What AI apps work with Letx Plugin?

Letx Plugin uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Letx Plugin MCP Server

by Shahriar Labs

Developer ToolsLow Risk10.0MCP RegistryRemote

Free

Server data from the Official MCP Registry

Collaborative LaTeX editor: search 1000+ templates, edit projects, and compile them to PDF.

About

Collaborative LaTeX editor: search 1000+ templates, edit projects, and compile them to PDF.

Remote endpoints: streamable-http: https://api.letx.app/mcp

Security Report

10.0

Low Risk10.0Low Risk

Valid MCP server (1 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.

Endpoint verified · Requires authentication · 1 issue found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Found in Source Code

Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.

HTTP Network Access

Connects to external APIs or services over the internet.

How to Connect

Remote Plugin

No local installation needed. Your AI client connects to the remote endpoint directly.

Add this to your MCP configuration to connect:

{
  "mcpServers": {
    "app-letx-letx": {
      "url": "https://api.letx.app/mcp"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

letX

letX is a collaborative LaTeX editor. This plugin connects your AI assistant to your letX account, so you can work on LaTeX documents from the conversation: find a template, start a project, read and edit its files, and compile it to PDF, with the LaTeX errors reported by file and line so they can be fixed.

What it includes

The letX MCP server at https://api.letx.app/mcp. You sign in with your letX account (OAuth 2.1) and approve what the assistant may do: read letX's templates, read and edit your projects, and compile them. You can disconnect it at any time in letX under Settings, Connected apps.
Two skills:
- compile-and-fix: compile LaTeX from the conversation or a letX project, and fix the errors it reports until the document builds.
- start-from-template: find a template in letX's library and start a project from it.

Connect from other MCP clients

The server is also in the MCP Registry as app.letx/letx. Any client can reach it at https://api.letx.app/mcp (streamable HTTP). The first connection opens letX in your browser to sign in and approve access.

Claude Code: claude mcp add --transport http letx https://api.letx.app/mcp
Codex CLI: codex mcp add letx --url https://api.letx.app/mcp, then approve in the browser tab it opens. If Codex later says it is not signed in, run codex mcp login letx.
Other clients that support remote MCP servers with OAuth: add https://api.letx.app/mcp as a remote server in their MCP settings.

Tools

Tool	What it does	Changes anything?
`search_templates`	Search letX's LaTeX template library	No
`get_template`	Details of one template: description, author, license, page link	No
`search`, `fetch`	The same template search and details, in the shape deep research expects	No
`list_projects`	Your letX projects, with their ids	No
`list_project_files`	The documents and uploaded files in one project	No
`read_project_file`	The text of one document in a project	No
`create_project`	A new project from LaTeX files	Creates a project
`create_project_from_template`	A new project from a template	Creates a project
`update_project_file`	Create or replace one document; the previous version stays in the project's history	Replaces a file
`compile_latex`	Compile LaTeX from the conversation in your "AI Scratchpad" project	Replaces that project's files of the same name
`compile_project`	Compile one of your projects	Starts a build
`set_project_compiler`	Set a project's TeX engine: pdflatex, xelatex or lualatex	Changes one setting

What it sends and receives

The plugin runs no code on your machine and connects to nothing but the letX MCP server above. When the assistant calls a tool, letX receives that call's arguments (for example the file it writes or the project it compiles) and returns the result: project names and ids, file lists, the text of the files it reads, template details, compile results with the errors from the log, and a link that opens the PDF for an hour. letX does not receive your conversation. The details are in the privacy policy.

Requirements

A letX account. Using letX from an AI app is part of letX's paid plans, and in Claude a free account can try it for 7 days from its first connection. Plans are described at https://letx.app/pricing/.

Support

https://letx.app/help/ or support@letx.app. Documentation and example prompts: https://letx.app/mcp/

License

MIT. See LICENSE.

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