Module client 

Downstream MCP client (#210).

A real MCP client built on the official rmcp SDK — no bespoke JSON-RPC. Each operation opens a fresh connection (performs the initialize handshake), does its work, and shuts the connection down. This keeps the gateway stateless and robust (no stale child processes / sessions); the expensive part — listing the full catalog — is amortized by the TTL cache in super::catalog.

Functions

call_tool_on

Call a tool on an already-connected session (bounded by timeout).

fetch_tools

List a downstream server’s tools (connect → tools/list → disconnect).

list_tools_on

List tools on an already-connected session (bounded by timeout).

open

Open a connection to a downstream MCP server (runs the MCP initialize handshake). The whole connect is bounded by timeout.

proxy_call

Proxy a single tool call to a downstream server (connect → tools/call → disconnect).

result_to_text

Flatten a downstream CallToolResult into plain text. Text blocks are concatenated; non-text blocks (images/resources) are summarized so the proxy never returns binary blobs into the model context.

Type Aliases

ClientService

A connected downstream MCP client session. Transport-erased: stdio, HTTP, and (in tests) in-process duplex all collapse to this one type.