Smithery is a public registry of MCP servers. MCP (Model Context Protocol) is an open standard through which AI agents call outside tools; an MCP server wraps one service, such as web search or a business application, as a set of tools that an agent can call. Smithery was founded by Henry Mao and Anirudh Kamath, and Arcade.dev acquired it in August 2026.
The site lists MCP servers and agent skills, each with a description, a usage count and its tools, and developers publish their own servers there. Until 31 October 2026, Smithery also ran a connection service: its CLI and API connected an agent to a server once and handled OAuth sign-in, credential storage and token refresh, so the same connected account worked across Claude, GPT and open-source models. On that date Smithery shuts down this service, together with its accounts, API keys, CLI and SDKs. Smithery stays online as a public, non-proxied directory powered by Arcade.dev, and its server pages show each vendor's direct MCP address.
The directory is open to everyone. Paid plans end with the shutdown, and Smithery refunds every charge made since 5 August 2026.