Prism

Multi-server MCP tool bridge — expose banking, email, calendar, and custom API tools over the Model Context Protocol.

Prism lets you define multiple servers, each with its own bearer token and set of accounts. AI clients (Cursor, Claude Desktop, etc.) connect to a server's MCP endpoint and get access to only the tools and accounts that server is configured for.

Architecture

┌─────────────┐     ┌─────────────┐
│  AI Client   │     │  AI Client   │
│  (Cursor)    │     │  (Claude)    │
└──────┬───────┘     └──────┬───────┘
       │ Bearer A           │ Bearer B
       ▼                    ▼
┌──────────────────────────────────┐
│            Prism                 │
│  /mcp/server-a  /mcp/server-b   │
│  ┌──────────┐   ┌──────────┐    │
│  │ 9 accts  │   │ 3 accts  │    │
│  │ 17 tools │   │ 11 tools │    │
│  └──────────┘   └──────────┘    │
└────┬────┬────┬────┬─────────────┘
     │    │    │    │
     ▼    ▼    ▼    ▼
   bunq  IMAP  Cal  Cyans

Each server exposes the same tool types but scoped to its own accounts. A personal server sees all your email accounts; a shared server only sees the shared mailbox.

Tools (24)

Category	Tool	Description
bunq	bunq_list_accounts	List configured bank accounts
	bunq_list_transactions	List transactions with date/amount filters
	bunq_get_transaction	Get full transaction details
	bunq_get_transaction_notes	Get notes and attachments on a transaction
Email	email_list_accounts	List configured email accounts
	email_list_folders	List mailbox folders with unread counts
	email_search	Search emails by sender, subject, date, flags
	email_get_messages	Fetch one or many messages (same-folder or folder+uid combos)
	email_send	Send a new message or reply (markdown, threaded, saved to Sent)
Calendar	calendar_list_calendars	List configured ICS calendars
	calendar_list_events	List upcoming events with date range filter
	calendar_get_event	Get event details by UID
Cyans	cyans_get_open_topics	Get open topics for a user
	cyans_get_topic_details	Get full topic with posts
	cyans_search_topics	Search topics by subject
	cyans_add_post	Add a post to a topic
Picnic	picnic_list_accounts	List configured Picnic accounts
	picnic_search_products	Search grocery products by name
	picnic_get_cart	Get the current shopping cart
	picnic_add_to_cart	Add a product to the cart
	picnic_remove_from_cart	Remove a product from the cart
	picnic_list_deliveries	List past and upcoming deliveries (optional state filter)
	picnic_get_delivery	Get full details of a single delivery
Utility	day_name	Get day-of-week for a date
	sum	Sum an array of numbers

Quick Start

1. Clone and install

git clone https://github.com/YOUR_ORG/prism.git
cd prism
composer install
npm install && npx encore dev

2. Configure

Copy the example config and edit it:

cp prism.config.yaml.example prism.config.yaml

servers:
  my-server:
    label: "My Personal Server"
    bearer_token: "generate-a-random-token"
    accounts:
      my-email:
        type: email
        label: "Personal Email"
        imap:
          host: "imap.example.com"
          port: 993
          encryption: ssl
          username: "me@example.com"
          password: "app-password"
          validate_cert: true
        smtp:
          host: "smtp.example.com"
          port: 465
          encryption: ssl
        identity:
          email: "user@example.com"
          name: "Example User"
      my-picnic:
        type: picnic
        label: "Picnic NL"
        username: "me@example.com"
        password: "your-picnic-password"
        country_code: "nl"

Set admin credentials:

# .env.local
APP_AUTH_USER=admin
APP_AUTH_PASSWORD=a-secure-password

3. Run with Docker

docker compose up -d

The app is served via Traefik. Configure the hostname in docker-compose.yml.

4. Connect your AI client

Add to your Cursor .mcp.json:

{
  "mcpServers": {
    "prism": {
      "url": "https://your-host/mcp/my-server",
      "headers": {
        "Authorization": "Bearer generate-a-random-token"
      }
    }
  }
}

Admin UI

Prism includes a built-in admin dashboard at /admin with:

• Server list — overview of all configured servers with account/tool counts
• Configuration tab — connection details and .mcp.json snippet
• Accounts tab — accounts grouped by type
• Tools tab — all available tools for the server, linking to detail pages
• Tool detail — input schema, parameters table, and an interactive Try It panel for executing tools with YAML input/output

Each tab and tool detail page has its own URL for bookmarking.

Account Types

Type	Config Keys	What It Connects To
bunq	api_key, environment, monetary_account_id	bunq banking API
email	imap.*, smtp.*, identity.*	Any IMAP mailbox + SMTP relay (read, search, send, save-to-Sent)
calendar	ics_url, summary	Any ICS/iCal feed (Google Calendar, etc.)
cyans	dsn, username	Cyans topic tracking API
picnic	username, password, country_code	Picnic grocery delivery (unofficial API)

Tech Stack

• PHP 8.2+ / Symfony 7.2
• Tailwind CSS via Webpack Encore
• Docker with Traefik reverse proxy
• MCP Protocol v2024-11-05 (JSON-RPC over HTTP with Bearer auth)

License

MIT