Runway API

Clone this repository and save it to a folder on your computer. Remember where you saved this folder because you'll need it in a later step.

Runnpm installin the folder, thennpm run build. You should now see a new folder calledbuildwith aindex.jsfile inside. If you later modify any source files, runnpm run buildagain to pick up the changes.

Using the MCP as a Claude Desktop extension (recommended)

This installs the server as an unpacked Claude Desktop extension, so you don't have to edit any config files by hand.
-

Launch Claude Desktop and openSettings.

Go toExtensions, thenAdvanced Settings.

ClickInstall Unpacked Extensionand select the folder you cloned in step 1 (for example/Users/edwin/runway-api-mcp-server). ClickInstallon the prompt.

Now, try asking Claude to generate an image!

Using the MCP with Claude Desktop (config file)

open ~/Library/Application\ Support/Claude/claude_desktop_config.json

notepad %APPDATA%\Claude\claude_desktop_config.json

- Add therunway-api-mcp-serverto the config, make sure to replace the file path and Runway API key.

RUNWAYML_API_SECRET=key_xxx npm run start:http # server listens on http://0.0.0.0:3000/mcp curl http://127.0.0.1:3000/healthz # → {"ok":true}

To test from web clients (claude.ai) without deploying, use a tunnel that returns HTTPS. Cloudflared works; ngrok is currently blocked by Anthropic's connector backend:

cloudflared tunnel --url http://127.0.0.1:3000

Use the printedhttps://<random>.trycloudflare.com/mcpas the connector URL.

npm i -g @railway/cli # one-time railway login railway init # create a new project, link this folder railway up # builds & deploys railway domain # provisions https://<your-app>.up.railway.app

Set environment variables in the Railway dashboard (orrailway variables):
- Settings → Connectors → Add custom connector
- URL:https://<your-app>.up.railway.app/mcp
- Leave OAuth fields blank (Bearer-key flow)

For public, multi-tenant hosting, every user supplies their own Runway API key:

curl -X POST https://<your-app>.up.railway.app/mcp \ -H "Content-Type: application/json" \ -H "Accept: application/json, text/event-stream" \ -H "Authorization: Bearer <user_runway_key>" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

WhenREQUIRE_AUTH=true, requests without a Bearer header receive a 401. Bearer keys take priority overRUNWAYML_API_SECRETeven when both are set.

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