50 lines
2.5 KiB
Markdown
50 lines
2.5 KiB
Markdown
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# MCP Overview
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TREK includes a built-in [Model Context Protocol](https://modelcontextprotocol.io/) (MCP) server. MCP is an open standard that lets AI assistants read and modify data in external services through a structured API. When the MCP addon is enabled on your TREK instance, AI clients such as Claude.ai, Claude Desktop, Cursor, VS Code, and others can connect directly to your trips.
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## What you can do
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Once connected, an AI assistant can work with your TREK data in a single conversation:
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- Create and update trips, days, and itineraries
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- Search for real-world places and add them to your trip
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- Build and manage packing lists and to-do items
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- Track budgets and expenses across trip members
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- Create reservations, transport bookings, and accommodations
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- Send collab messages and notes to other trip members
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- Mark countries and regions as visited in Atlas
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- Log vacation days in Vacay
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- Write journey entries across multiple trips
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Changes made through MCP are broadcast to all connected clients in real-time — exactly like changes made in the web UI.
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## Requirements
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- **MCP addon enabled** — an administrator must enable the MCP addon (`mcp`) from the Admin Panel before the `/mcp` endpoint becomes available and the MCP section appears in user settings.
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- **`APP_URL` set** — the `APP_URL` environment variable must be configured to your TREK instance's public URL so that OAuth discovery works correctly. Without it, clients that use OAuth 2.1 cannot complete authentication.
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## Rate limits and session limits
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| Setting | Default | Environment variable |
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|---|---|---|
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| Requests per minute per user | 300 | `MCP_RATE_LIMIT` |
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| Max concurrent sessions per user | 20 | `MCP_MAX_SESSION_PER_USER` |
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Rate limits are tracked per user–client pair, so each OAuth client has its own independent window. Sessions expire after 1 hour of inactivity.
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## Endpoint
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```
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https://<your-trek-instance>/mcp
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```
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If the MCP addon is not enabled, this endpoint returns `403`. If authentication fails, it returns `401`.
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> **Admin:** Enable the MCP addon in [Admin-Addons](Admin-Addons). Set `APP_URL` for OAuth discovery. Revoke tokens and manage OAuth clients from [Admin-MCP-Tokens](Admin-MCP-Tokens). Adjust rate and session limits with `MCP_RATE_LIMIT` and `MCP_MAX_SESSION_PER_USER` — see [Environment-Variables](Environment-Variables).
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## Next steps
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1. [MCP-Setup](MCP-Setup) — connect your AI client
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2. [MCP-Scopes](MCP-Scopes) — choose the right permissions
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3. [MCP-Tools-and-Resources](MCP-Tools-and-Resources) — browse available tools
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