Paragon MCP Server is a server implementation for Model Context Protocol (MCP) that integrates with ActionKit, Paragon's API for access to prebuilt actions across 130+ integrations to your users' SaaS applications. It enables you to expose user-facing integrations from your Paragon account as capabilities for your agent, with examples such as Google Calendar (create or update events, get availability), Salesforce (query and manage CRM records), and Slack (send notifications). The server automatically prompts users to authorize these integrations via the Connect Portal, a prebuilt component for secure OAuth 2.0 and API Key intake flows. You can optionally extend the MCP with Custom Actions or direct API access as available tools. For Custom Actions, enable via ENABLE_CUSTOM_OPENAPI_ACTIONS and place OpenAPI specs in an openapi/ folder at the repository root, naming files after the integration (e.g., openapi/googleCalendar.json). The MCP will automatically match OpenAPI specs with Active integrations in your Paragon project to augment the list of available tools. An experimental Proxy API tool can be enabled with ENABLE_PROXY_API_TOOL, allowing the agent to write its own API requests to the integration API with caution. The MCP exposes endpoints /sse, /messages, and /setup for communication and setup. In development mode (NODE_ENV=development), /sse may accept any user via the ?user= parameter to test as a specific user.