Crate mcp_execution_introspector 

MCP server introspection using rmcp official SDK.

This crate provides functionality to discover MCP server capabilities, tools, resources, and prompts using the official rmcp SDK. It enables automatic extraction of tool schemas for code generation.

Architecture

The introspector connects to MCP servers via stdio (subprocess) or Streamable HTTP transport (used for both Transport::Http and Transport::Sse) and uses rmcp’s ServiceExt trait to query server capabilities. Discovered information is stored locally for subsequent code generation phases.

Examples

use mcp_execution_introspector::Introspector;
use mcp_execution_core::{ServerId, ServerConfig};

let mut introspector = Introspector::new();

// Connect to github server
let server_id = ServerId::new("github").unwrap();
let config = ServerConfig::builder()
    .command("github-server".to_string())
    .build()?;

let info = introspector
    .discover_server(server_id, &config)
    .await?;

println!("Server: {} v{}", info.name, info.version);
println!("Tools found: {}", info.tools.len());

for tool in &info.tools {
    println!("  - {}: {}", tool.name, tool.description);
}

Structs

Introspector

MCP server introspector.

ServerCapabilities

Server capabilities.

ServerInfo

Information about an MCP server.

ToolInfo

Information about an MCP tool.

Constants

MAX_SCHEMA_SIZE_BYTES

Maximum serialized JSON byte size for a single tool’s input_schema, as reported by the server.

MAX_TOOL_COUNT

Maximum number of tools accepted from a single MCP server’s list_all_tools response (denial-of-service protection, CWE-400).

MAX_TOOL_DESCRIPTION_LEN

Maximum byte length for a single tool’s description, as reported by the server.

MAX_TOOL_NAME_LEN

Maximum byte length for a single tool’s name, as reported by the server.