lizard-build/lizard-mcp

An MCP server that lets ChatGPT, Claude and other MCP clients deploy and manage apps on Lizard (lizard.build).

Connect it once, then ask your assistant to ship a service, read logs, set secrets, scale replicas or attach a domain — in plain words.

Connect a client

The server speaks Streamable HTTP at POST /mcp, and stdio for clients that spawn a local process instead (below). A hosted instance runs at:

https://employ-woman-g1q2.us-east-1.onlizard.com/mcp

Every request carries a bearer token. A client that speaks OAuth gets one itself — the server advertises where, so there is nothing to paste. Clients that only send headers use a liz_ API key instead:

lizard keys create my-mcp-key

The dashboard creates the same thing under Sandboxes → Get started → New API key. Either way the key is shown once.

Claude Code

claude mcp add --transport http lizard https://employ-woman-g1q2.us-east-1.onlizard.com/mcp

Claude Code runs the OAuth flow on first use. To skip it and use a key:

claude mcp add --transport http lizard https://employ-woman-g1q2.us-east-1.onlizard.com/mcp \
  --header "Authorization: Bearer liz_your_key"

Cursor and other clients configured by JSON

{
  "mcpServers": {
    "lizard": {
      "url": "https://employ-woman-g1q2.us-east-1.onlizard.com/mcp",
      "headers": { "Authorization": "Bearer liz_your_key" }
    }
  }
}

ChatGPT

ChatGPT connects to a URL and runs OAuth itself — no key to paste. It needs developer mode and a registered connection; see Publishing to Codex / ChatGPT below.

Against a local server

Run it as described in the next section, then use http://localhost:3000/mcp in place of the hosted URL.

Check the connection

curl -sS -X POST https://employ-woman-g1q2.us-east-1.onlizard.com/mcp \
  -H "Authorization: Bearer liz_your_key" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Without a token the same call returns 401 and a WWW-Authenticate header pointing at the OAuth metadata. That is the server working, not failing.

Run it

npm install
npm run build
npm start

For development with reload:

npm run dev

Run it over stdio

npm start serves HTTP. To have a client spawn the server instead, point it at dist/stdio.js:

{
  "mcpServers": {
    "lizard": {
      "command": "node",
      "args": ["/path/to/lizard-mcp/dist/stdio.js"],
      "env": { "LIZARD_TOKEN": "liz_your_key" }
    }
  }
}

A spawned process has no browser to run OAuth in, so the token comes from the environment and binds the process to one user. Without it the server still starts and lists its tools — calling one then returns a message asking for a key.

Configuration

Variable	Default	What it does
PORT	3000	Port to listen on (HTTP only)
PUBLIC_URL	http://localhost:$PORT	The URL clients reach this server on. Sets the OAuth resource identifier, so it must match the real address in production.
PLATFORM_URL	https://lizard.build	The Lizard API this server talks to
LIZARD_TOKEN	—	API key for stdio mode, where there is no OAuth handshake. LIZARD_API_KEY works too.

Tools

Area	Tools
Account	whoami, workspace_list, project_list, project_create, region_list, billing_summary
Services	service_list, service_show, service_create, service_set, service_rename, service_delete, service_scale, service_get_port, service_set_port, addon_create
Deploys	deploy_redeploy, deploy_restart, deploy_events
Logs and metrics	logs_tail, metrics_get
Secrets	secrets_list, secrets_set, secrets_delete, secrets_refs
Domains	domain_attach, domain_verify, domain_delete
Git	git_connect, git_checkout, git_status
Shell	ssh_exec
Config as code	config_apply

Tool names use snake_case (not the MCP spec's permitted dots) to match OpenAI's function-name pattern ^[a-zA-Z0-9_-]{1,64}$, which some ChatGPT/Codex surfaces enforce directly.

Destructive tools — service_delete, secrets_delete, domain_delete, ssh_exec — require an explicit confirmation argument, so a client cannot delete anything or run arbitrary commands by accident.

Auth

The server speaks OAuth 2.1 as an MCP protected resource (RFC 9728). It holds no secrets of its own: every request carries a bearer token, and Lizard decides whether that token is valid. Both OAuth-issued tokens and liz_ API keys work.

Each request builds a fresh server bound to the caller's token, so one process serves many users without sharing state.

Over stdio there is no OAuth and no per-request token — the key comes from the environment and the process serves one user, as described above.

Tests

npm test        # unit tests
npm run typecheck

test/manual/mcp-inspector.md covers end-to-end checks against a stub platform and a live one.

Deployed instance

This server itself runs as a Lizard app: lizard-mcp in mikelun's workspace, deployed straight from this repo (git-source, auto-redeploys on push to main).

https://employ-woman-g1q2.us-east-1.onlizard.com/mcp

PUBLIC_URL is set on that service to match, so allowedHosts/OAuth resource metadata line up with the real domain — see src/index.ts.

Publishing to Codex / ChatGPT

.codex-plugin/plugin.json is in place. This is a hosted remote MCP server (not a bundled stdio one), so it's wired via .app.json + a registered connection, not .mcp.json. That last step needs a human in a real ChatGPT session — it isn't scriptable:

1. In ChatGPT: Settings → Security and login → Developer mode (turn it on).
2. Go to ChatGPT Plugins → + → enter the MCP server URL above → complete the connection.
3. Copy the resulting plugin_asdk_app_... ID from the browser URL.
4. Add .app.json at the repo root:

   { "app": { "id": "plugin_asdk_app_..." } }
   

5. Add "apps": "./.app.json" to .codex-plugin/plugin.json.
6. Test locally via a marketplace entry (@plugin-creator, or hand-write ~/.agents/plugins/marketplace.json), then submit through the plugin submission portal for public review.

License

MIT