Bring in mcp-* crates from goose as a starting point

Cargo.toml

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+[workspace]
+members = ["crates/*"]
+resolver = "2"
+
+[workspace.package]
+edition = "2024"
+version = "1.0.7"
+authors = ["Block <ai-oss-tools@block.xyz>"]
+license = "MIT"
+repository = "https://github.com/modelcontextprotocol/rust-sdk/"
+description = "Rust SDK for the Model Context Protocol"

crates/mcp-client/Cargo.toml

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+[package]
+name = "mcp-client"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+mcp-core = { path = "../mcp-core" }
+tokio = { version = "1", features = ["full"] }
+reqwest = { version = "0.11", default-features = false, features = ["json", "stream", "rustls-tls"] }
+eventsource-client = "0.12.0"
+futures = "0.3"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+async-trait = "0.1.83"
+url = "2.5.4"
+thiserror = "1.0"
+anyhow = "1.0"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+tower = { version = "0.4", features = ["timeout", "util"] }
+tower-service = "0.3"
+rand = "0.8"
+
+[dev-dependencies]

crates/mcp-client/README.md

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+## Testing stdio transport
+
+```bash
+cargo run -p mcp-client --example stdio
+```
+
+## Testing SSE transport
+
+1. Start the MCP server in one terminal: `fastmcp run -t sse echo.py`
+2. Run the client example in new terminal: `cargo run -p mcp-client --example sse`
+

crates/mcp-client/examples/clients.rs

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+use mcp_client::{
+    client::{ClientCapabilities, ClientInfo, McpClient, McpClientTrait},
+    transport::{SseTransport, StdioTransport, Transport},
+    McpService,
+};
+use rand::Rng;
+use rand::SeedableRng;
+use std::time::Duration;
+use std::{collections::HashMap, sync::Arc};
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Initialize logging
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::from_default_env().add_directive("mcp_client=debug".parse().unwrap()),
+        )
+        .init();
+
+    let transport1 = StdioTransport::new("uvx", vec!["mcp-server-git".to_string()], HashMap::new());
+    let handle1 = transport1.start().await?;
+    let service1 = McpService::with_timeout(handle1, Duration::from_secs(30));
+    let client1 = McpClient::new(service1);
+
+    let transport2 = StdioTransport::new("uvx", vec!["mcp-server-git".to_string()], HashMap::new());
+    let handle2 = transport2.start().await?;
+    let service2 = McpService::with_timeout(handle2, Duration::from_secs(30));
+    let client2 = McpClient::new(service2);
+
+    let transport3 = SseTransport::new("http://localhost:8000/sse", HashMap::new());
+    let handle3 = transport3.start().await?;
+    let service3 = McpService::with_timeout(handle3, Duration::from_secs(10));
+    let client3 = McpClient::new(service3);
+
+    // Initialize both clients
+    let mut clients: Vec<Box<dyn McpClientTrait>> =
+        vec![Box::new(client1), Box::new(client2), Box::new(client3)];
+
+    // Initialize all clients
+    for (i, client) in clients.iter_mut().enumerate() {
+        let info = ClientInfo {
+            name: format!("example-client-{}", i + 1),
+            version: "1.0.0".to_string(),
+        };
+        let capabilities = ClientCapabilities::default();
+
+        println!("\nInitializing client {}", i + 1);
+        let init_result = client.initialize(info, capabilities).await?;
+        println!("Client {} initialized: {:?}", i + 1, init_result);
+    }
+
+    // List tools for all clients
+    for (i, client) in clients.iter_mut().enumerate() {
+        let tools = client.list_tools(None).await?;
+        println!("\nClient {} tools: {:?}", i + 1, tools);
+    }
+
+    println!("\n\n----------------------------------\n\n");
+
+    // Wrap clients in Arc before spawning tasks
+    let clients = Arc::new(clients);
+    let mut handles = vec![];
+
+    for i in 0..20 {
+        let clients = Arc::clone(&clients);
+        let handle = tokio::spawn(async move {
+            // let mut rng = rand::thread_rng();
+            let mut rng = rand::rngs::StdRng::from_entropy();
+            tokio::time::sleep(Duration::from_millis(rng.gen_range(5..50))).await;
+
+            // Randomly select an operation
+            match rng.gen_range(0..4) {
+                0 => {
+                    println!("\n{i}: Listing tools for client 1 (stdio)");
+                    match clients[0].list_tools(None).await {
+                        Ok(tools) => {
+                            println!("  {i}: -> Got tools, first one: {:?}", tools.tools.first())
+                        }
+                        Err(e) => println!("  {i}: -> Error: {}", e),
+                    }
+                }
+                1 => {
+                    println!("\n{i}: Calling tool for client 2 (stdio)");
+                    match clients[1]
+                        .call_tool("git_status", serde_json::json!({ "repo_path": "." }))
+                        .await
+                    {
+                        Ok(result) => println!(
+                            "  {i}: -> Tool execution result, is_error: {:?}",
+                            result.is_error
+                        ),
+                        Err(e) => println!("  {i}: -> Error: {}", e),
+                    }
+                }
+                2 => {
+                    println!("\n{i}: Listing tools for client 3 (sse)");
+                    match clients[2].list_tools(None).await {
+                        Ok(tools) => {
+                            println!("  {i}: -> Got tools, first one: {:?}", tools.tools.first())
+                        }
+                        Err(e) => println!("  {i}: -> Error: {}", e),
+                    }
+                }
+                3 => {
+                    println!("\n{i}: Calling tool for client 3 (sse)");
+                    match clients[2]
+                            .call_tool(
+                                "echo_tool",
+                                serde_json::json!({ "message": "Client with SSE transport - calling a tool" }),
+                            )
+                            .await
+                        {
+                        Ok(result) => println!("  {i}: -> Tool execution result, is_error: {:?}", result.is_error),
+                        Err(e) => println!("  {i}: -> Error: {}", e),
+                    }
+                }
+                _ => unreachable!(),
+            }
+            Ok::<(), Box<dyn std::error::Error + Send + Sync>>(())
+        });
+        handles.push(handle);
+    }
+
+    // Wait for all tasks to complete
+    for handle in handles {
+        handle.await.unwrap().unwrap();
+    }
+
+    Ok(())
+}

crates/mcp-client/examples/sse.rs

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+use anyhow::Result;
+use mcp_client::client::{ClientCapabilities, ClientInfo, McpClient, McpClientTrait};
+use mcp_client::transport::{SseTransport, Transport};
+use mcp_client::McpService;
+use std::collections::HashMap;
+use std::time::Duration;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    // Initialize logging
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::from_default_env()
+                .add_directive("mcp_client=debug".parse().unwrap())
+                .add_directive("eventsource_client=info".parse().unwrap()),
+        )
+        .init();
+
+    // Create the base transport
+    let transport = SseTransport::new("http://localhost:8000/sse", HashMap::new());
+
+    // Start transport
+    let handle = transport.start().await?;
+
+    // Create the service with timeout middleware
+    let service = McpService::with_timeout(handle, Duration::from_secs(3));
+
+    // Create client
+    let mut client = McpClient::new(service);
+    println!("Client created\n");
+
+    // Initialize
+    let server_info = client
+        .initialize(
+            ClientInfo {
+                name: "test-client".into(),
+                version: "1.0.0".into(),
+            },
+            ClientCapabilities::default(),
+        )
+        .await?;
+    println!("Connected to server: {server_info:?}\n");
+
+    // Sleep for 100ms to allow the server to start - surprisingly this is required!
+    tokio::time::sleep(Duration::from_millis(500)).await;
+
+    // List tools
+    let tools = client.list_tools(None).await?;
+    println!("Available tools: {tools:?}\n");
+
+    // Call tool
+    let tool_result = client
+        .call_tool(
+            "echo_tool",
+            serde_json::json!({ "message": "Client with SSE transport - calling a tool" }),
+        )
+        .await?;
+    println!("Tool result: {tool_result:?}\n");
+
+    // List resources
+    let resources = client.list_resources(None).await?;
+    println!("Resources: {resources:?}\n");
+
+    // Read resource
+    let resource = client.read_resource("echo://fixedresource").await?;
+    println!("Resource: {resource:?}\n");
+
+    Ok(())
+}

crates/mcp-client/examples/stdio.rs

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+use std::collections::HashMap;
+
+use anyhow::Result;
+use mcp_client::{
+    ClientCapabilities, ClientInfo, Error as ClientError, McpClient, McpClientTrait, McpService,
+    StdioTransport, Transport,
+};
+use std::time::Duration;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> Result<(), ClientError> {
+    // Initialize logging
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::from_default_env()
+                .add_directive("mcp_client=debug".parse().unwrap())
+                .add_directive("eventsource_client=debug".parse().unwrap()),
+        )
+        .init();
+
+    // 1) Create the transport
+    let transport = StdioTransport::new("uvx", vec!["mcp-server-git".to_string()], HashMap::new());
+
+    // 2) Start the transport to get a handle
+    let transport_handle = transport.start().await?;
+
+    // 3) Create the service with timeout middleware
+    let service = McpService::with_timeout(transport_handle, Duration::from_secs(10));
+
+    // 4) Create the client with the middleware-wrapped service
+    let mut client = McpClient::new(service);
+
+    // Initialize
+    let server_info = client
+        .initialize(
+            ClientInfo {
+                name: "test-client".into(),
+                version: "1.0.0".into(),
+            },
+            ClientCapabilities::default(),
+        )
+        .await?;
+    println!("Connected to server: {server_info:?}\n");
+
+    // List tools
+    let tools = client.list_tools(None).await?;
+    println!("Available tools: {tools:?}\n");
+
+    // Call tool 'git_status' with arguments = {"repo_path": "."}
+    let tool_result = client
+        .call_tool("git_status", serde_json::json!({ "repo_path": "." }))
+        .await?;
+    println!("Tool result: {tool_result:?}\n");
+
+    // List resources
+    let resources = client.list_resources(None).await?;
+    println!("Available resources: {resources:?}\n");
+
+    Ok(())
+}