Add PATH detection back to developer extension (#7161)

crates/goose-server/src/state.rs

@@ -1,8 +1,11 @@
 use axum::http::StatusCode;
-use goose::builtin_extension::register_builtin_extensions;
+use goose::builtin_extension::{register_builtin_extension, register_builtin_extensions};
+use goose::config::paths::Paths;
 use goose::execution::manager::AgentManager;
 use goose::scheduler_trait::SchedulerTrait;
 use goose::session::SessionManager;
+use goose_mcp::DeveloperServer;
+use rmcp::ServiceExt;
 use std::collections::{HashMap, HashSet};
 use std::path::PathBuf;
 use std::sync::Arc;
@@ -25,9 +28,25 @@ pub struct AppState {
     pub extension_loading_tasks: ExtensionLoadingTasks,
 }
 
+fn spawn_developer(r: tokio::io::DuplexStream, w: tokio::io::DuplexStream) {
+    let bash_env = Paths::config_dir().join(".bash_env");
+    let server = DeveloperServer::new()
+        .extend_path_with_shell(true)
+        .bash_env_file(Some(bash_env));
+    tokio::spawn(async move {
+        match server.serve((r, w)).await {
+            Ok(running) => {
+                let _ = running.waiting().await;
+            }
+            Err(e) => tracing::error!(builtin = "developer", error = %e, "server error"),
+        }
+    });
+}
+
 impl AppState {
     pub async fn new() -> anyhow::Result<Arc<AppState>> {
         register_builtin_extensions(goose_mcp::BUILTIN_EXTENSIONS.clone());
+        register_builtin_extension("developer", spawn_developer);
 
         let agent_manager = AgentManager::instance().await?;
         let tunnel_manager = Arc::new(TunnelManager::new());