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fline

Official registry Developer tools

Hosting for apps you build with AI. Tested with Claude Code and Codex. Private beta: ask for access.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http fline 'https://mcp.fline.sh/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "fline": {
            "type": "http",
            "url": "https://mcp.fline.sh/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. fline skills
  2. Install
  3. What it sends, and where
  4. Skills
  5. Why skills when the MCP server has prompts
  6. Layout
  7. Testing
  8. Where this comes from
  9. License

fline skills

Skills that teach your AI coding app (Claude Code, Codex, Cursor and the other apps that read Agent Skills) how to put your project online with fline. For Claude Code, the repository is also a plugin that connects fline's MCP server.

Install

AppHow
Claude Code, including the Claude desktop app's Code tab/plugin marketplace add smartline-ai/fline-skills, then /plugin install fline@fline
Codex, Cursor, Gemini CLI, VS Code and othersnpx skills add smartline-ai/fline-skills
By handCopy skills/* into ~/.claude/skills/ (Claude Code) or ~/.agents/skills/ (Codex and others)

The Claude Code plugin brings fline's MCP server with it: type /mcp, choose fline, then Authenticate, and approve fline in your browser. Installed any other way, the skills carry no server; connect fline as the fline docs describe, or ask your AI app to, which loads fline-connect.

You need a fline account. fline is in private beta: see Getting your account.

What it sends, and where

The skills are instructions; on their own they send nothing anywhere. What leaves the computer goes through fline's MCP server at https://mcp.fline.sh/mcp, and only when the person asks for something fline does:

  • The project folder. scripts/pack.sh packs a copy of it as a .tar.gz, leaving out .git, node_modules, what the project's .gitignore ignores, and .env and key files, and the agent uploads it to fline's storage. fline keeps that copy so it can build and run the app. The original stays in the folder.
  • Parts of the code, to an AI model made by OpenAI, so fline can work out how to build and run the app. Passwords and keys saved on fline never go to it.
  • Tool calls. Project names, settings names, web addresses and the other arguments of fline's tools. Passwords and keys are typed by the person on a private fline page, not sent through the chat. The exception is a key the agent already holds, one it generated or one the person pasted into the chat: set_env sends that value to fline, which stores it and never shows it again.
  • What comes back. Project state, build output and the app's recent log lines, which hold whatever the app prints.

Sign-in is OAuth in the browser; the plugin holds no key. Disconnecting in the fline dashboard takes effect within 30 seconds. Details: privacy policy, terms, what fline does today.

Skills

SkillWhat it covers
fline-connectAdding fline's MCP server to the AI app, the browser approval, and the account states that refuse every call
fline-prepareReading a project for what stops it running on fline, and fixing it before the first upload, including a cheap health route fline can check
fline-launchFirst launch, updates, settings, restarts and putting an earlier version back; bundles scripts/pack.sh
fline-databaseA Postgres or Valkey that fline creates and runs, a database the person already runs, SQLite and files on disk
fline-domainA web address the person owns: the record, the checks, the 48-hour limit
fline-diagnoseWhat to read, in order, when a launch fails or a live app misbehaves, and the usual causes
fline-build-planfline.json: freezing the plan, editing it, check_config, several services, prebuilt images, volumes, the health path
fline-share-checkWhat to check in the app before the person sends its public link to anyone

They fall into three groups: using fline (connect, launch, database, domain, diagnose), preparing a project for it (prepare, build-plan), and making it safe to share (share-check).

Why skills when the MCP server has prompts

fline's server ships seven prompts with these procedures. In Claude Code an MCP prompt is a slash command the person types; the model has no tool to fetch one, so the server's instructions point at procedures the agent cannot open. A skill is loaded by the model itself when its description matches the task.

Skills name fline's tools without a prefix (create_project, not mcp__fline__create_project): the prefix differs between a plugin-provided server and one the person added.

Layout

.claude-plugin/plugin.json        the plugin, including fline's MCP server
.claude-plugin/marketplace.json   a marketplace holding that one plugin
skills/<name>/SKILL.md            one directory per skill (Agent Skills format)
skills/fline-launch/scripts/      pack.sh, run by the agent, never read
tests/                            scenarios and the projects they run on

Testing

  • claude plugin validate --strict . checks the manifests.
  • bash skills/fline-launch/scripts/pack.sh <folder> runs on the bash 3.2 and bsdtar that macOS ships, and on GNU tar.
  • tests/scenarios.md holds six scenarios with what a passing answer does, run by a fresh agent with and without the skills. tests/make-fixtures.sh writes the two seeded projects they run on: a Node shop and a Flask tracker.

Where this comes from

Every fact here restates fline's own documentation, in particular for-ai.md. This repository is published from fline's main repository; a change made only here is replaced by the next publish.

License

MIT

Frequently asked questions

What is fline?

Hosting for apps you build with AI. Tested with Claude Code and Codex. Private beta: ask for access.

How do I install fline?

It runs as a remote server. In Claude Code: claude mcp add --transport http fline 'https://mcp.fline.sh/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does fline need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is fline open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains fline?

It is published by smartline-ai. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.