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Larz OS MCP Server

Connect Larz OS to your AI assistant with one endpoint. Claude Desktop, Claude Code, Cursor, Windsurf and other MCP clients get instant access to 90+ Larz tools and DrLarz generation — no glue code.

🔌 Model Context Protocol ⚡ Streamable HTTP 🔑 One key, all clients 🆓 Free to start
Get a free API key → Browse the tools

The endpoint

The Larz MCP server is a remote, Streamable-HTTP server. Point any MCP client at it and authenticate with your Larz API key:

MCP https://larzos.com/mcp

It exposes three meta-tools — larz_generate (freeform generation), larz_list_tools, and larz_run_tool — plus every Larz tool directly as larz_<slug>. One key inherits your Larz plan: the Free tier has a daily allowance and Larz Pro unlocks Pro tools and higher limits across the tools, API and MCP.

Set it up in 3 steps

1

Create a free API key

Sign in and generate a key at larzos.com/developers. It looks like larz_sk_… — copy it once.

2

Add the server to your assistant

Use the config for your client below. Replace larz_sk_YOUR_KEY with your key.

3

Ask your assistant to use Larz

Try: "Use Larz to write a launch tweet thread for an eco water bottle." Your assistant will call the right Larz tool and return the result.

Install for your client

Claude Code
Claude Desktop
Cursor
Windsurf / other

One command in your terminal:

copyclaude mcp add --transport http larz-os https://larzos.com/mcp \
  --header "Authorization: Bearer larz_sk_YOUR_KEY"

Edit claude_desktop_config.json (Settings → Developer → Edit Config) and add:

copy{
  "mcpServers": {
    "larz-os": {
      "type": "http",
      "url": "https://larzos.com/mcp",
      "headers": { "Authorization": "Bearer larz_sk_YOUR_KEY" }
    }
  }
}

Restart Claude Desktop — Larz tools appear in the tools menu.

Add to ~/.cursor/mcp.json (or Settings → MCP → Add):

copy{
  "mcpServers": {
    "larz-os": {
      "url": "https://larzos.com/mcp",
      "headers": { "Authorization": "Bearer larz_sk_YOUR_KEY" }
    }
  }
}

Any MCP client that supports remote Streamable HTTP servers works. Point it at https://larzos.com/mcp and set an Authorization: Bearer larz_sk_YOUR_KEY header. Windsurf, Cline, and Zed use the same mcpServers shape shown for Cursor.

🔒 Your key never leaves your machine's config — the server verifies it and forwards only your request. Revoke or rotate keys anytime from the developer dashboard.

What you get

✍️ Writing & marketing
Blog posts, ad copy, email sequences, sales pages, SEO briefs, LinkedIn & threads.
₿ Crypto & Web3
Token explainers, tokenomics, trading plans, market notes — educational, not advice.
📚 Study & learning
Study notes, flashcards, lesson plans, course outlines.
💻 Developer
Code help, regex, cron explainers, SQL generation.
🤖 DrLarz generation
Freeform text generation with larz_generate for anything else.
🧩 Community tools
Approved developer tools show up automatically in the catalog.

See the full tool catalog →

Verify it's connected

You can hit the health check directly:

copycurl https://larzos.com/mcp/health

Or test a tool call with your key:

copycurl -X POST https://larzos.com/mcp \
  -H "Authorization: Bearer larz_sk_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
       "params":{"name":"larz_slogan","arguments":{"input":"an eco water bottle"}}}'

FAQ

Do I need a paid plan?

No. Start free — your key includes a daily allowance. One Larz Pro plan raises limits and unlocks Pro tools everywhere: the tools, the API, and this MCP server.

Is this OpenAI/Anthropic-shaped?

It's the open Model Context Protocol, so it drops into any MCP client. Generation is powered by DrLarz, the Larz OS assistant.

Can I add my own tools?

Yes — register a tool in the developer portal. Once approved it appears in the catalog and becomes callable here automatically.

Get your free key →API quickstart