Paxaver MCP

Paxaver MCP Server

AI-facing adapter over the Paxaver school community platform. Implements the Model Context Protocol (MCP) on Cloudflare Workers with RS256 JWT validation, capability-first authorization, and Streamable HTTP transport.

What this is

The Paxaver MCP server lets AI assistants (ChatGPT, Claude, Perplexity, and any MCP-compatible client) act on behalf of a Paxaver user: check a lunch menu, order lunch, review wallet balance and transaction history, register for fundraising events, enroll students in school programs, volunteer, and — for school administrators — manage restaurants, menu items, events, attendee check-in, volunteer shifts, program waitlists, and daily orders.

It is a thin adapter. It contains no business logic and holds no database, payment, or email credentials. Every action runs against the Paxaver backend API as the authenticated user, and errors are sanitized before they reach the client.

Connect

Point an MCP-compatible client at the hosted endpoint and sign in with a Paxaver account when prompted (OAuth 2.1 Authorization Code + PKCE):

https://mcp.paxaver.com/mcp

The server speaks MCP protocol 2025-06-18 over Streamable HTTP (POST /mcp). One endpoint serves all regions; the user's region is resolved from their account at sign-in.

Install

npm install @paxaver/mcp

The package ships the Worker source for self-hosting and development. Most users only need the hosted endpoint above.

Run locally

pnpm install        # Node >= 26.8.2, pnpm >= 10
pnpm dev            # Miniflare on http://localhost:8787 — MCP endpoint: POST /mcp

Docker

docker build -t paxaver-mcp .
docker run -p 8787:8787 paxaver-mcp
# MCP endpoint: http://localhost:8787/mcp

Self-hosted and local instances perform no token-revocation check: a revoked token stays valid until it expires. Tokens are still verified by signature, expiry, and a live user-context load.

See CONTRIBUTING.md for the full development setup.

Tools

The server exposes 37 tools grouped into six categories. Visibility in tools/list is filtered by the caller's roles; every call is re-authorized before dispatch, and the backend re-checks data-level access (defense-in-depth).

Prompts

The server registers four prompts: daily_lunch_menu, wallet_balance, upcoming_events, and lunch_order_helper (optional student_name argument). Availability and content are returned by prompts/list and prompts/get.

Ordering is draft → review → payment: create_lunch_order_draft, adjust with update_lunch_order_draft, then pay_lunch_order_draft.

sign_out ends the caller's sign-in for this MCP connection: the next request gets the usual sign-in challenge. An app that holds its own Paxaver credentials cannot be signed out this way — the result directs the user to disconnect Paxaver in that app or in their Paxaver account settings instead.

Pre-2.5 tool names still resolve to the canonical tools but are no longer advertised; the retired order_lunch tool is removed. Financial and destructive tools are labeled and require user confirmation.

Privacy

The only contact information returned through MCP tools is the caller's own sign-in email — get_my_context includes it so a client can answer "which login am I on?", and sign_out names the account it signs out. Phone, address, and other contact fields are never returned. Student data is limited to IDs, names, and school slugs; allergies, notes, birthday, and other PII are not exposed in read responses. The MCP server does not log user data.

Documentation

Internal documentation (architecture, authentication, authorization, full tool reference, deployment, security model, test scenarios) lives in the private Paxaver monorepo under docs/paxaver-mcp/ and is intentionally not published.

Tech stack

• Runtime: Cloudflare Workers
• Framework: Hono v4
• JWT: jose v6 (RS256 via JWKS)
• Protocol: MCP 2025-06-18, Streamable HTTP
• Build/deploy: Wrangler v4
• Test: Vitest v5 (Workers pool + Node pool)

Support

• Bug reports and feature requests: GitHub issues
• Security reports: see SECURITY.md

License

Apache-2.0. Copyright (c) 2026 Smartoire. See LICENSE.