Diagnostics (#5323)

Co-authored-by: Douwe Osinga <douwe@squareup.com>

crates/goose-cli/src/cli.rs

@@ -135,7 +135,7 @@ enum SessionCommand {
         #[arg(short, long, help = "Regex for removing matched sessions (optional)")]
         regex: Option<String>,
     },
-    #[command(about = "Export a session to Markdown format")]
+    #[command(about = "Export a session")]
     Export {
         #[command(flatten)]
         identifier: Option<Identifier>,
@@ -156,6 +156,16 @@ enum SessionCommand {
         )]
         format: String,
     },
+    #[command(name = "diagnostics")]
+    Diagnostics {
+        /// Session ID to generate diagnostics for
+        #[arg(short, long)]
+        session_id: String,
+
+        /// Output path for the diagnostics zip file (optional, defaults to current directory)
+        #[arg(short, long)]
+        output: Option<PathBuf>,
+    },
 }
 
 #[derive(Subcommand, Debug)]
@@ -847,6 +857,10 @@ pub async fn cli() -> Result<()> {
                     .await?;
                     Ok(())
                 }
+                Some(SessionCommand::Diagnostics { session_id, output }) => {
+                    crate::commands::session::handle_diagnostics(&session_id, output).await?;
+                    Ok(())
+                }
                 None => {
                     let session_start = std::time::Instant::now();
                     let session_type = if resume { "resumed" } else { "new" };