Backed by [ffl](https://github.com/nuwainfo/ffl), which turns any file/folder into an HTTPS link.
If you already use Ffl MCP, the ffl mcp mcp server is the piece that lets your assistant work with it directly. Backed by ffl, which turns any file/folder into an HTTPS link.
The toolset is worth reading before you wire it up, because it tells you what the integration is really for:
Sharing — Preview sidecar routes (/manifest, /file, /thumb) are only created for folder shares and multi-file shares. Single-file shares are served as directDownloading — Downloads from FastFileLink URLs (WebRTC P2P when possible, HTTP fallback) or any HTTP(S) URL (works like wget)Keygen — Generates an RSA keypair for passwordless pubkey recipient auth: - .fflpub — share with the sender (pass as recipientPublicKey) - .fflkeySetup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client. The configuration blocks on this page cover the common clients.
Configuration is passed through the environment: ALLOWED_BASE_DIR, FFL_USE_STDIN, FFL_BIN, FFL_CORE_PATH. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Ffl MCP's toolset — Sharing, Downloading, Keygen — is a fair guide to whether it matches your workflow. It is maintained by nuwainfo; worth a glance at recent repository activity before you build anything load-bearing on it.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
| Tool | What it does |
|---|---|
| Sharing | 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 UR |
| Downloading | Downloads from FastFileLink URLs (WebRTC P2P when possible, HTTP fallback) or any HTTP(S) URL (works like wget). |
| Keygen | 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) |
---
## MCP Config (manual JSON)
```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"
}
}
}
}Configuration as documented by the project. Restart the client after saving.
| Variable | Description | Required |
|---|---|---|
| ALLOWED_BASE_DIR | Filesystem location the server is allowed to use. | Optional |
| FFL_USE_STDIN | Configuration value read at startup. | Optional |
| FFL_BIN | Configuration value read at startup. | Optional |
| FFL_CORE_PATH | Filesystem location the server is allowed to use. | Optional |
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