ffl-mcp (local-only)

MCP server for ffl. Let AI share anything for you.

Backed by ffl, which turns any file/folder into an HTTPS link.

This is a minimal MCP server that shells out to ffl / ffl.com locally. No file contents are sent to the LLM; the model only triggers local ffl.

This demo shows collaborative debugging: Claude on the left shares a local environment (DB + logs) via P2P link, Claude on the right downloads and diagnoses the error. In this scenario, the two Claudes represent different people working on separate machines.

Table of Contents

• Installation

  • Windows — GUI Installer

  • Linux / macOS — one-liner

  • Windows — one-liner (PowerShell)

  • uvx (no binary, requires uv)

  • Run directly (development)

• MCP Config (manual JSON)

• Tools

  • Sharing

  • Downloading

  • Keygen

  • Session Management

• Notes

• Testing

• WSL2 Users

Related MCP server: kintone MCP Server

Installation

⚡ Short URLs for convenience

• Linux/macOS: curl -fsSL https://fastfilelink.com/mcp/install.sh | bash

• Windows (script): iwr -useb https://fastfilelink.com/mcp/install.ps1 | iex

🔒 fastfilelink.com/mcp/* is a redirect to GitHub. Use the direct GitHub URLs below if you prefer.

Windows — GUI Installer

Download and run ffl-mcp-setup.exe from the latest release.

No command line needed — the installer registers ffl-mcp with Claude Desktop and Claude Code automatically.

Linux / macOS — one-liner

curl -fsSL https://raw.githubusercontent.com/nuwainfo/ffl-mcp/refs/heads/main/install.sh | bash

Downloads the platform binary from the latest GitHub release and runs ffl-mcp install to register with Claude. Falls back to uvx automatically if no binary is available for your platform.

Windows — one-liner (PowerShell)

iwr -useb https://raw.githubusercontent.com/nuwainfo/ffl-mcp/refs/heads/main/install.ps1 | iex

Downloads ffl-mcp.exe from the latest GitHub release and registers it with Claude.

uvx (no binary, requires uv)

uvx --from git+https://github.com/nuwainfo/ffl-mcp install

Targets can be controlled with --target (default: all):

uvx --from git+https://github.com/nuwainfo/ffl-mcp install --target claude-desktop,codex-desktop,codex-cli

uvx --from git+https://github.com/nuwainfo/ffl-mcp install --print

If Claude Code CLI is installed, the installer also runs claude mcp add automatically (user scope). The installer also writes Codex MCP config to ~/.codex/config.toml for Codex Desktop/CLI/IDE. If Codex CLI is installed, the installer also runs codex mcp add automatically. For custom config paths, pass the file:

uvx --from git+https://github.com/nuwainfo/ffl-mcp install --config /path/to/claude_desktop_config.json
uvx --from git+https://github.com/nuwainfo/ffl-mcp install --codex-config /path/to/codex/config.toml

Run directly (development)

Prereq: uv installed.

# optional: override embedded ffl.com (APE) or use "ffl" on PATH
export FFL_BIN="$HOME/bin/ffl.com"
chmod +x "$FFL_BIN"

# optional safety: restrict file sharing to a directory
export ALLOWED_BASE_DIR="$HOME/Downloads"

# optional: use stdin for text/base64 instead of temp files
export FFL_USE_STDIN=1

uvx --from git+https://github.com/nuwainfo/ffl-mcp ffl-mcp

MCP Config (manual JSON)

{
  "mcpServers": {
    "ffl": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/nuwainfo/ffl-mcp", "ffl-mcp"],
      "env": {
        "ALLOWED_BASE_DIR": "/Users/you/Downloads",
        "FFL_USE_STDIN": "1"
      }
    }
  }
}

Tools

Sharing

Common options for all share tools:

Additional options for fflShareFile / fflShareFiles:

Preview sidecar routes (/manifest, /file, /thumb) are only created for folder shares and multi-file shares. Single-file shares are served as direct file links, even when preview=True. MCP returns the base FastFileLink URL and does not append ?preview=true; users may add that query string manually.

Response fields: sessionId, link, pid, qrCode? (ASCII art when qrInTerminal=True), debugLogPath?

Downloading

fflDownload(url, outputPath?, resume?, authUser?, authPassword?,
            recipientAuth?, pickupCode?, recipientPrivateKey?, proxy?,
            enableReporting?)
  -> {ok, returncode, outputPath?, transferMode?, transferInfo?, message?, ...}

Downloads from FastFileLink URLs (WebRTC P2P when possible, HTTP fallback) or any HTTP(S) URL (works like wget).

For authenticated links: pass recipientAuth + pickupCode (pickup mode) or recipientPrivateKey (pubkey mode). Set enableReporting=True only when you want to opt into ffl diagnostic error reporting for troubleshooting.

Keygen

fflKeygen(name?) -> {ok, returncode, output}

Generates an RSA keypair for passwordless pubkey recipient auth:

• <name>.fflpub — share with the sender (pass as recipientPublicKey)

• <name>.fflkey — keep private (pass as recipientPrivateKey when downloading)

Session Management

• fflListSessions() — list active share sessions

• fflStopSession(sessionId) — terminate a session

• fflGetSession(sessionId) — get session details

• fflGetSessionEvents(sessionId, limit=50) — retrieve webhook events

Notes

• FFL_USE_STDIN=1 avoids writing text/base64 payloads to disk.

• FFL_RUN_MODE=python runs the Core.py CLI (requires FFL_CORE_PATH).

• FFL_USE_HOOK=1 starts a local webhook server and passes it to ffl for real-time link/progress events.

• FFL_DEBUG=1 saves ffl output to a temp log file; path returned as debugLogPath. Set FFL_DEBUG=/path/to/log.txt to use a fixed path.

• ALLOWED_BASE_DIR restricts fflShareFile/fflShareFiles to a specific directory.

Testing

# Unit + binary tests (no network needed)
python -m unittest discover -s tests -p "*Test.py" -v

# All tests including share/download round-trips (requires network)
FFL_INTEGRATION_TESTS=1 python -m unittest discover -s tests -p "*Test.py" -v

WSL2 Users

If you encounter TLSError([0x6300]) errors, run this command to disable Windows interop for .com files:

sudo sh -c 'echo -1 > /proc/sys/fs/binfmt_misc/WSLInterop'

This allows ffl.com (APE binary) to run natively on Linux instead of being executed through Windows.