cargo-mcp

use crate::state::CargoTools; use anyhow::Result; use mcplease::{ traits::{Tool, WithExamples}, types::Example, }; use serde::{Deserialize, Serialize}; use std::path::PathBuf; /// Set the working directory for cargo operations /// /// This sets the shared working directory that will be used by all AI tools, /// not just cargo-mcp. Other MCP servers like fs-mcp will also use this directory. #[derive(Debug, Serialize, Deserialize, schemars::JsonSchema, clap::Args)] #[serde(rename = "set_working_directory")] pub struct SetWorkingDirectory { /// Path to set as the working directory /// Can be absolute or relative to current directory pub path: String, } impl WithExamples for SetWorkingDirectory { fn examples() -> Vec<Example<Self>> { vec![ Example { description: "Set working directory to current directory", item: Self { path: ".".into(), }, }, Example { description: "Set working directory to a Rust project", item: Self { path: "~/my-rust-project".into(), }, }, Example { description: "Set working directory using absolute path", item: Self { path: "/Users/username/projects/my-app".into(), }, }, ] } } impl Tool<CargoTools> for SetWorkingDirectory { fn execute(self, state: &mut CargoTools) -> Result<String> { let expanded_path = PathBuf::from(&*shellexpand::tilde(&self.path)); let canonical_path = std::fs::canonicalize(&expanded_path) .map_err(|e| anyhow::anyhow!("Could not resolve path '{}': {}", self.path, e))?; state.set_working_directory(canonical_path.clone(), None)?; // Check if it's a Rust project and provide helpful feedback let cargo_toml = canonical_path.join("Cargo.toml"); if cargo_toml.exists() { Ok(format!( "✅ Working directory set to: {}\n🦀 Rust project detected (Cargo.toml found)", canonical_path.display() )) } else { Ok(format!( "✅ Working directory set to: {}\n⚠️ No Cargo.toml found - this doesn't appear to be a Rust project", canonical_path.display() )) } } }