Gives any MCP client the First100 go-to-market tools: brand memory, planning, publishing and scheduling on X, LinkedIn, Threads and Bluesky, the growth loop and reply radar, site audits and Google Search Console, keyword and AI visibility data, blog research and publishing (GitHub, WordPress, Ghost, Webflow or a hosted blog), scheduled workflows, community and business discovery, and cold email through your own mailbox. Set FIRST100_MCP_URL to a domain endpoint (https://firsthundred.app/api/mcp/core, /seo, /autopilot or /outreach) to load only that part.

Get an API key at https://firsthundred.app/dashboard/keys.

Clients that speak HTTP (no install needed)

# Claude Code
claude mcp add --transport http first100 https://firsthundred.app/api/mcp \
  --header "Authorization: Bearer f100_..."

claude.ai and Claude Desktop: add https://firsthundred.app/api/mcp as a custom connector. ChatGPT (paid plans): Settings → Plugins → Developer mode, then Plugins → plus icon → custom server with the same URL. All sign in through OAuth, no key needed. Codex: codex mcp add first100 --url https://firsthundred.app/api/mcp then codex mcp login first100 (sign-in), or add --bearer-token-env-var FIRST100_API_KEY. Cursor: an MCP entry with the URL and an Authorization header.

Clients that need stdio

{
  "mcpServers": {
    "first100": {
      "command": "npx",
      "args": ["-y", "first100-mcp"],
      "env": { "FIRST100_API_KEY": "f100_..." }
    }
  }
}

Works in Codex, Cursor, Windsurf, Zed, Claude Desktop and anything else that launches stdio servers.

Tools

See what your agent can do for a capability overview. Start with the quickstart or client setup guide. Once connected, your MCP client discovers the available tools and their instructions directly from First100.

For agents: start at llms.txt, read the Markdown guide, or load the First100 JSON guide. These describe setup and use; authenticated MCP tool discovery provides the current tool inputs.