# RayBridge
MCP server that bridges Raycast extensions to any MCP-compatible client.
Discovers locally installed Raycast extensions, loads their tool definitions, and serves them over the [Model Context Protocol](https://modelcontextprotocol.io/) via stdio or HTTP.
## How it works
1. Scans `~/.config/raycast/extensions/` for installed extensions with `tools` definitions
2. Loads OAuth tokens from Raycast's encrypted SQLite database
3. Registers tools as MCP tools accessible to any MCP client
Extensions that use Raycast UI APIs (`List`, `Detail`, `Form`, etc.) are supported — the UI components are shimmed to no-ops so the underlying tool logic can execute headlessly. Extensions whose tools perform background work (API calls, data lookups, transformations) work best.
## Setup
### Prerequisites
- [Bun](https://bun.sh)
- [Raycast](https://raycast.com) installed with extensions
- `sqlcipher` CLI (for OAuth token access): `brew install sqlcipher`
### Install
```bash
bun install
```
### Configure MCP client
**Claude Code** (`~/.claude/settings.json`):
```json
{
"mcpServers": {
"raybridge": {
"command": "bun",
"args": ["run", "src/index.ts"],
"cwd": "/path/to/raybridge"
}
}
}
```
**Cursor** (`~/.cursor/mcp.json`):
```json
{
"mcpServers": {
"raybridge": {
"command": "bun",
"args": ["run", "src/index.ts"],
"cwd": "/path/to/raybridge"
}
}
}
```
### HTTP Transport
The server can also run as an HTTP server for remote MCP clients.
**Start the server:**
```bash
# Default: http://0.0.0.0:3000
bun run start:http
# Custom host/port
MCP_PORT=8080 MCP_HOST=0.0.0.0 bun run start:http
# With API key authentication
MCP_API_KEY=your-secret-key bun run start:http
# CLI flags also work
bun run src/index.ts --http --port 8080 --host 0.0.0.0
```
**Endpoints:**
| Endpoint | Method | Description |
|----------|--------|-------------|
| `/health` | GET | Health check (no auth required) |
| `/mcp` | POST | MCP requests (requires auth if `MCP_API_KEY` set) |
| `/mcp` | DELETE | Terminate session |
**Authentication:**
When `MCP_API_KEY` is set, requests to `/mcp` must include a Bearer token (per MCP spec):
```
Authorization: Bearer your-secret-key
```
**Example session:**
```bash
# 1. Initialize session (capture session ID from response header)
curl -X POST http://127.0.0.1:3000/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-H "Authorization: Bearer your-secret-key" \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{
"protocolVersion":"2024-11-05",
"capabilities":{},
"clientInfo":{"name":"my-client","version":"1.0"}
}}'
# Response includes: mcp-session-id header
# 2. List available tools
curl -X POST http://127.0.0.1:3000/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-H "Authorization: Bearer your-secret-key" \
-H "mcp-session-id: <session-id-from-step-1>" \
-d '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}'
# 3. Call a tool
curl -X POST http://127.0.0.1:3000/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-H "Authorization: Bearer your-secret-key" \
-H "mcp-session-id: <session-id-from-step-1>" \
-d '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{
"name":"web",
"arguments":{"tool_name":"read_page","input":{"url":"https://example.com"}}
}}'
```
Sessions auto-expire after 30 minutes of inactivity.
## CLI
RayBridge includes a CLI for managing which extensions and tools are exposed:
```bash
bun link # Register the raybridge command (one-time setup)
raybridge # Launch interactive TUI
raybridge config # Launch interactive TUI
raybridge list # List all extensions and their status
raybridge help # Show help
```
The TUI allows you to:
- Toggle extensions on/off
- Expand extensions to toggle individual tools
- Switch between blocklist mode (all enabled by default) and allowlist mode
- Save configuration to `~/.config/raybridge/tools.json`
## Configuration
### Tools configuration
Control which extensions and tools are exposed via `~/.config/raybridge/tools.json`:
```json
{
"mode": "blocklist",
"extensions": {
"extension-name": {
"enabled": false
},
"another-extension": {
"enabled": true,
"tools": ["specific-tool-1", "specific-tool-2"]
}
}
}
```
- **blocklist mode** (default): All extensions enabled unless explicitly disabled
- **allowlist mode**: All extensions disabled unless explicitly enabled
### Extension preferences
Extensions that require configuration (API keys, personal access tokens, etc.) read from:
```
~/.config/raybridge/preferences.json
```
```json
{
"extension-name": {
"personalAccessToken": "your-token",
"apiKey": "your-key"
}
}
```
The extension name matches the `name` field in the extension's `package.json`.
## Architecture
```
src/
├── index.ts # MCP server, tool registration, request dispatch
├── http-server.ts # HTTP transport with session management
├── cli.ts # CLI entry point (config, list, help commands)
├── tui.tsx # Interactive TUI for extension configuration
├── config.ts # Tools configuration (blocklist/allowlist)
├── discovery.ts # Scans ~/.config/raycast/extensions/ for tool definitions
├── loader.ts # Executes local tools with Raycast API shims
├── shims.ts # Fake @raycast/api, react, react/jsx-runtime modules
├── auth.ts # Keychain access, SQLcipher DB decryption, OAuth tokens
└── watcher.ts # Watches extension directories for changes, triggers reloads
```
### Tool discovery
Local extensions are discovered from `~/.config/raycast/extensions/`. Each extension's `package.json` must have a `tools` array defining available tools with names, descriptions, and input schemas. Compiled tool code lives at `tools/{toolName}.js` within each extension directory.
When duplicates exist (same extension name in multiple directories), the most recently modified version wins.
### Tool execution
Tools are loaded by installing Raycast API shims into Node's module system, then requiring the tool's compiled JS file and calling its default export with the provided input.
### Raycast API shims
The following `@raycast/api` features are shimmed:
| Feature | Behavior |
|---|---|
| `OAuth.PKCEClient` | Returns tokens from Raycast's encrypted DB |
| `getPreferenceValues()` | Returns values from `preferences.json` |
| `environment` | Provides extension name, paths, version info |
| `Cache` | In-memory key-value store |
| `showToast`, `showHUD` | No-op (logs to stderr in some cases) |
| `open`, `closeMainWindow`, `popToRoot` | No-op |
| `confirmAlert` | Returns `undefined` |
| UI components (`List`, `Detail`, `Form`, etc.) | Return `null` |
| `LocalStorage` | No-op |
| `Clipboard` | No-op |
React and JSX runtime are also shimmed with minimal mocks (`createElement` → `null`, hooks are no-ops).
### Authentication
OAuth tokens are read from Raycast's encrypted SQLite database at:
```
~/Library/Application Support/com.raycast.macos/raycast-enc.sqlite
```
The database key is retrieved from macOS Keychain and derived with a salt via SHA256. Tokens are extracted per-extension and provided to tools through the `OAuth.PKCEClient` shim.
## MCP tool schema
Extensions are grouped — each extension becomes one MCP tool. The input schema follows this pattern:
```json
{
"tool_name": "which-tool-to-run",
"input": { "param": "value" }
}
```
Tool descriptions include per-tool documentation, parameter details, and any extension-wide AI instructions from the extension's `ai.instructions` field.
## Limitations
- **No interactive UI** — extensions that depend on rendering Lists, Forms, or other visual components to the user won't behave meaningfully
- **No persistent LocalStorage** — shimmed as no-op; extensions relying on it lose state between calls
- **OAuth tokens are not refreshed** — expired tokens will cause failures until Raycast refreshes them
- **macOS only** — depends on macOS Keychain and Raycast's macOS app paths
