MCP Server

Zuko exposes a Model Context Protocol (MCP) server so AI clients can read and write CRM data on behalf of a logged-in user. Authentication uses OAuth 2.1 with RFC 9728 protected-resource metadata — clients discover auth endpoints automatically.

Endpoint

POST {BACKEND_URL}/api/mcp

Only POST is accepted. GET and DELETE return 405 — the server is stateless with no sessions to manage.

OAuth flow

Client hits /api/mcp without a token → receives 401 with WWW-Authenticate pointing to /.well-known/oauth-protected-resource/api/mcp
Client fetches protected-resource metadata → discovers the authorization server at {BACKEND_URL}/auth
Client fetches /.well-known/oauth-authorization-server/auth → gets authorize URL, token URL, JWKS URI, and supported scopes
User completes the authorization code flow and approves scopes on the consent screen
Client exchanges the code for a JWT access token (audience = {BACKEND_URL}/api/mcp)
Client sends Authorization: Bearer <token> on every MCP request

Tokens are JWTs verified locally against {BACKEND_URL}/auth/jwks — no round-trip to the auth server per request.

Scopes

Scope	Grants
`organizations:read`	List organizations the user belongs to
`tasks:read`	List and retrieve tasks
`tasks:write`	Create and update tasks

Tools

`list_organizations`

Scope: organizations:read Returns the organizations the authorized user belongs to. Call this first when the user belongs to multiple organizations to get the correct organizationId for task tools. Input: (none) Output:

[{ "id": 1, "name": "Acme", "slug": "acme", "role": "owner" }]

`list_tasks`

Scope: tasks:read Returns up to 50 tasks (most recently updated) across all organizations the user belongs to.

Input	Type	Description
`status`	`"TODO" \| "IN_PROGRESS" \| "DONE" \| "CANCELLED"`	Filter by status (optional)
`organizationId`	`integer`	Restrict to one organization (optional)

`get_task`

Scope: tasks:read Returns full task detail including owners, subtasks, and parent task.

Input	Type	Description
`taskId`	`integer`	ID of the task to retrieve

`create_task`

Scope: tasks:write Creates a task. If the user belongs to exactly one organization, organizationId can be omitted — call list_organizations first if they belong to multiple.

Input	Type	Description
`title`	`string`	Task title (required)
`organizationId`	`integer`	Target organization (optional if user has exactly one)
`description`	`any`	Description in JSON format (optional)
`status`	enum	Initial status — defaults to `"TODO"` (optional)
`assignee`	`string`	Assignee identifier (optional)

`update_task`

Scope: tasks:write Updates one or more fields on an existing task. Only supplied fields are changed.

Input	Type	Description
`taskId`	`integer`	ID of the task to update (required)
`title`	`string`	New title (optional)
`description`	`any`	New description in JSON format (optional)
`status`	enum	New status (optional)
`assignee`	`string`	New assignee (optional)
`completedAt`	`string`	Completion timestamp in ISO 8601 format (optional)

Connecting a client

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "zuko": {
      "type": "http",
      "url": "https://your-backend.example.com/api/mcp"
    }
  }
}

Claude Code

claude mcp add --transport http zuko https://your-backend.example.com/api/mcp

Cursor / VS Code

Add a remote MCP server pointing to {BACKEND_URL}/api/mcp. The client handles OAuth discovery and the login flow on first use.

Environment variables

Variable	Default	Description
`BACKEND_URL`	`http://localhost:3001`	Public backend URL — used in OAuth metadata responses
`BETTER_AUTH_URL`	`http://localhost:8000`	Auth server base URL — used by the bearer guard to verify JWTs

Overview

Getting Started

Setup

Concepts

Guides

Endpoint

OAuth flow

Scopes

Tools

`list_organizations`

`list_tasks`

`get_task`

`create_task`

`update_task`

Connecting a client

Claude Desktop

Claude Code

Cursor / VS Code

Environment variables

​Endpoint

​OAuth flow

​Scopes

​Tools

​list_organizations

​list_tasks

​get_task

​create_task

​update_task

​Connecting a client

​Claude Desktop

​Claude Code

​Cursor / VS Code

​Environment variables

Endpoint

OAuth flow

Scopes

Tools

`list_organizations`

`list_tasks`

`get_task`

`create_task`

`update_task`

Connecting a client

Claude Desktop

Claude Code

Cursor / VS Code

Environment variables