Crate fastmcp_client 

MCP client implementation for FastMCP.

This crate provides the client-side implementation:

• Client builder pattern
• Tool invocation
• Resource reading
• Prompt fetching

Example

use fastmcp_rust::Client;

let client = Client::stdio("uvx", &["my-mcp-server"]).await?;

// List tools
let tools = client.list_tools().await?;

// Call a tool
let result = client.call_tool("greet", json!({"name": "World"})).await?;

Role in the System

fastmcp-client is the companion client to fastmcp-server. It uses the same protocol models and transport layer to:

• Spawn MCP servers as subprocesses (stdio)
• Initialize sessions and negotiate capabilities
• Call tools, read resources, and fetch prompts

If you are embedding FastMCP into a larger application (e.g. testing, orchestration, or local agent tooling), this is the crate that drives the client side of the protocol.

Modules

mcp_config

MCP Configuration file support for server registry.

Structs

Client

An MCP client instance.

ClientBuilder

Builder for configuring an MCP client.

ClientSession

Client-side session state.

Type Aliases

ProgressCallback

Callback for receiving progress notifications during tool execution.