MCP server APIs

Introduced 3.0

Model Context Protocol (MCP) defines how an agent can discover and execute tools. The MCP server in OpenSearch allows agents to connect and use available tools.

The MCP server in ML Commons uses the Streamable HTTP transport protocol to communicate with the clients. For details about the transport, see the official MCP documentation.

ML Commons supports the following MCP APIs:

• Register MCP tools
• Update MCP tools
• List MCP tools
• Remove MCP tools
• MCP Streamable HTTP Server

Removed APIs

The following experimental APIs were removed in OpenSearch 3.3 in favor of the Streamable HTTP transport:

• MCP SSE Message API
• MCP SSE Session API