MCP - Model Context Protocol

The mcp module connects external MCP servers. Their tools become virtual Digitorn tools (naming like mcp_<server>__<tool>), not a fixed catalog of mcp.connect / mcp.call_tool agent actions.

Property	Value
Module id	mcp
Fixed agent tools	none (dynamic)
Transports	stdio / SSE / HTTP (Go client)

Configure servers

yaml

tools:
  modules:
    mcp:
      config:
        auto_install: false
        servers:
          filesystem:
            transport: stdio
            command: npx
            args: ["-y", "@modelcontextprotocol/server-filesystem", "/tmp"]
  capabilities:
    grant:
      - module: mcp

Server config is normalized by schema.NormalizeServers. Hub catalog / OAuth flows exist in the daemon; verify against current Hub + internal/modules/mcp rather than Python-era snippets.

How agents call MCP tools

Once connected, tools appear in the tool index like any other module action (subject to injection mode and grants). Use search_tools / get_tool / direct call / execute_tool.

Resources and prompts may be exposed as additional virtual tools when the server advertises them (see internal/modules/mcp/virtual.go).

Related

• mcp module
• Install an MCP server
• YAML building blocks