Buildin

An MCP (Model Context Protocol) server for Buildin.ai — gives LLMs (Claude Desktop, Claude Code, Cursor, etc.) full access to pages, databases, blocks, search, users, and Markdown helpers. 19 tools total.

Getting your API token

1. Go to Buildin.ai Integrations
2. Create a new Plugin
3. In the permissions section, enable:
   • Read data
   • Write data
   • Edit data
4. Copy the generated token (starts with sk-...)

Quick start

BUILDIN_API_TOKEN=sk-... npx buildin-mcp

The server starts on stdio and is ready to accept MCP requests.

Usage with MCP clients

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "buildin": {
      "command": "npx",
      "args": ["-y", "buildin-mcp"],
      "env": {
        "BUILDIN_API_TOKEN": "sk-..."
      }
    }
  }
}

Claude Code

claude mcp add buildin -e BUILDIN_API_TOKEN=sk-... -- npx -y buildin-mcp

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "buildin": {
      "command": "npx",
      "args": ["-y", "buildin-mcp"],
      "env": {
        "BUILDIN_API_TOKEN": "sk-..."
      }
    }
  }
}

Windsurf / any stdio MCP client

BUILDIN_API_TOKEN=sk-... npx -y buildin-mcp

OpenCode

Add to your project's opencode.jsonc or global ~/.config/opencode/opencode.jsonc (inside the "mcp" section):

"buildin": {
  "type": "local",
  "command": ["npx", "-y", "buildin-mcp"],
  "environment": {
    "BUILDIN_API_TOKEN": "sk-..."
  },
  "enabled": true
}

Note: OpenCode uses "environment" (not "env") for passing environment variables to local MCP servers.

Install from source (optional)

git clone https://github.com/ekho/buildin-mcp.git
cd buildin-mcp
npm install
npm run build
node dist/index.js

Environment variables

Variable	Required	Description
BUILDIN_API_TOKEN	yes	Plugin token from Buildin.ai
BUILDIN_API_BASE_URL	no	Override API base (default: https://api.buildin.ai/v1)
BUILDIN_MCP_DEBUG	no	Set to 1 for verbose debug logging to stderr

---

Tools (19 total)

Pages (5)

• buildin_create_page — POST /v1/pages
• buildin_get_page — GET /v1/pages/{id}
• buildin_update_page — PATCH /v1/pages/{id}
• buildin_archive_page — PATCH /v1/pages/{id} with archived=true
• buildin_get_page_children — GET /v1/blocks/{page_id}/children

Databases (4)

• buildin_create_database — POST /v1/databases
• buildin_get_database — GET /v1/databases/{id}
• buildin_query_database — POST /v1/databases/{id}/query
• buildin_update_database — PATCH /v1/databases/{id}

Blocks (5)

• buildin_get_block — GET /v1/blocks/{id}
• buildin_get_block_children — GET /v1/blocks/{id}/children
• buildin_append_block_children — PATCH /v1/blocks/{id}/children
• buildin_update_block — PATCH /v1/blocks/{id}
• buildin_delete_block — DELETE /v1/blocks/{id}

Search & Users (2)

• buildin_search — POST /v1/search
• buildin_get_me — GET /v1/users/me

Markdown helpers (3)

• buildin_append_markdown — convert Markdown to Buildin blocks and append
• buildin_get_page_markdown — read a page's contents as Markdown
• buildin_search_and_fetch — search + auto-fetch contents of the top N pages

Buildin.ai does not expose a Comments API or a hard-delete for pages — archive is the documented way to remove pages.

Development

• Runtime: Node 18+, TypeScript 5.6, ESM.
• Transport: stdio only.
• Logging: stderr only — stdout is reserved for MCP JSON-RPC. Never console.log.
• Retries: automatic on 429 and 5xx (except 501), exponential backoff, 3 attempts.

Verify

npm run typecheck        # tsc --noEmit
npm run build            # compiles to dist/
npm test                 # unit tests for markdown converters
npm run smoke            # stdio JSON-RPC: initialize + tools/list must return 19 tools

License

MIT