feat(cli): add --debug flag to goose session / run (#1564)

crates/goose-cli/src/commands/bench.rs

@@ -83,8 +83,14 @@ async fn run_eval(
     let requirements = evaluation.required_extensions();
 
     // Create session with error capture
-    let base_session =
-        build_session(None, false, requirements.external, requirements.builtin).await;
+    let base_session = build_session(
+        None,
+        false,
+        requirements.external,
+        requirements.builtin,
+        false,
+    )
+    .await;
 
     let bench_session = Arc::new(Mutex::new(BenchSession::new(base_session)));
     let bench_session_clone = bench_session.clone();

crates/goose-cli/src/main.rs

@@ -90,6 +90,14 @@ enum Command {
         )]
         resume: bool,
 
+        /// Enable debug output mode
+        #[arg(
+            long,
+            help = "Enable debug output mode with full content and no truncation",
+            long_help = "When enabled, shows complete tool responses without truncation and full paths."
+        )]
+        debug: bool,
+
         /// Add stdio extensions with environment variables and commands
         #[arg(
             long = "with-extension",
@@ -157,6 +165,14 @@ enum Command {
         )]
         resume: bool,
 
+        /// Enable debug output mode
+        #[arg(
+            long,
+            help = "Enable debug output mode with full content and no truncation",
+            long_help = "When enabled, shows complete tool responses without truncation and full paths."
+        )]
+        debug: bool,
+
         /// Add stdio extensions with environment variables and commands
         #[arg(
             long = "with-extension",
@@ -285,6 +301,7 @@ async fn main() -> Result<()> {
         Some(Command::Session {
             identifier,
             resume,
+            debug,
             extension,
             builtin,
         }) => {
@@ -293,6 +310,7 @@ async fn main() -> Result<()> {
                 resume,
                 extension,
                 builtin,
+                debug,
             )
             .await;
 
@@ -306,6 +324,7 @@ async fn main() -> Result<()> {
             interactive,
             identifier,
             resume,
+            debug,
             extension,
             builtin,
         }) => {
@@ -332,6 +351,7 @@ async fn main() -> Result<()> {
                 resume,
                 extension,
                 builtin,
+                debug,
             )
             .await;
             setup_logging(session.session_file().file_stem().and_then(|s| s.to_str()))?;
@@ -410,7 +430,7 @@ async fn main() -> Result<()> {
                 return Ok(());
             } else {
                 // Run session command by default
-                let mut session = build_session(None, false, vec![], vec![]).await;
+                let mut session = build_session(None, false, vec![], vec![], false).await;
                 setup_logging(session.session_file().file_stem().and_then(|s| s.to_str()))?;
                 let _ = session.interactive(None).await;
                 return Ok(());

crates/goose-cli/src/session/builder.rs

@@ -15,6 +15,7 @@ pub async fn build_session(
     resume: bool,
     extensions: Vec<String>,
     builtins: Vec<String>,
+    debug: bool,
 ) -> Session {
     // Load config and get provider/model
     let config = Config::global();
@@ -92,7 +93,7 @@ pub async fn build_session(
     };
 
     // Create new session
-    let mut session = Session::new(agent, session_file.clone());
+    let mut session = Session::new(agent, session_file.clone(), debug);
 
     // Add extensions if provided
     for extension_str in extensions {

crates/goose-cli/src/session/mod.rs

@@ -36,6 +36,7 @@ pub struct Session {
     session_file: PathBuf,
     // Cache for completion data - using std::sync for thread safety without async
     completion_cache: Arc<std::sync::RwLock<CompletionCache>>,
+    debug: bool, // New field for debug mode
 }
 
 // Cache structure for completion data
@@ -56,7 +57,7 @@ impl CompletionCache {
 }
 
 impl Session {
-    pub fn new(agent: Box<dyn Agent>, session_file: PathBuf) -> Self {
+    pub fn new(agent: Box<dyn Agent>, session_file: PathBuf, debug: bool) -> Self {
         let messages = match session::read_messages(&session_file) {
             Ok(msgs) => msgs,
             Err(e) => {
@@ -70,6 +71,7 @@ impl Session {
             messages,
             session_file,
             completion_cache: Arc::new(std::sync::RwLock::new(CompletionCache::new())),
+            debug,
         }
     }
 
@@ -393,7 +395,7 @@ impl Session {
                                     }
 
                                     if msg.role == mcp_core::Role::User {
-                                        output::render_message(&msg);
+                                        output::render_message(&msg, self.debug);
                                     }
                                     self.messages.push(msg);
                                 }
@@ -461,7 +463,7 @@ impl Session {
                                 session::persist_messages(&self.session_file, &self.messages, None).await?;
 
                                 if interactive {output::hide_thinking()};
-                                output::render_message(&message);
+                                output::render_message(&message, self.debug);
                                 if interactive {output::show_thinking()};
                             }
                         }
@@ -547,7 +549,7 @@ impl Session {
             // No need for description update here
             session::persist_messages(&self.session_file, &self.messages, None).await?;
 
-            output::render_message(&Message::assistant().with_text(&prompt));
+            output::render_message(&Message::assistant().with_text(&prompt), self.debug);
         } else {
             // An interruption occurred outside of a tool request-response.
             if let Some(last_msg) = self.messages.last() {
@@ -562,13 +564,19 @@ impl Session {
                             session::persist_messages(&self.session_file, &self.messages, None)
                                 .await?;
 
-                            output::render_message(&Message::assistant().with_text(prompt));
+                            output::render_message(
+                                &Message::assistant().with_text(prompt),
+                                self.debug,
+                            );
                         }
                         Some(_) => {
                             // A real users message
                             self.messages.pop();
                             let prompt = "Interrupted before the model replied and removed the last message.";
-                            output::render_message(&Message::assistant().with_text(prompt));
+                            output::render_message(
+                                &Message::assistant().with_text(prompt),
+                                self.debug,
+                            );
                         }
                         None => panic!("No content in last message"),
                     }

crates/goose-cli/src/session/output.rs

@@ -96,14 +96,14 @@ pub fn hide_thinking() {
     THINKING.with(|t| t.borrow_mut().hide());
 }
 
-pub fn render_message(message: &Message) {
+pub fn render_message(message: &Message, debug: bool) {
     let theme = get_theme();
 
     for content in &message.content {
         match content {
             MessageContent::Text(text) => print_markdown(&text.text, theme),
-            MessageContent::ToolRequest(req) => render_tool_request(req, theme),
-            MessageContent::ToolResponse(resp) => render_tool_response(resp, theme),
+            MessageContent::ToolRequest(req) => render_tool_request(req, theme, debug),
+            MessageContent::ToolResponse(resp) => render_tool_response(resp, theme, debug),
             MessageContent::Image(image) => {
                 println!("Image: [data: {}, type: {}]", image.data, image.mime_type);
             }
@@ -126,18 +126,18 @@ pub fn render_message(message: &Message) {
     println!();
 }
 
-fn render_tool_request(req: &ToolRequest, theme: Theme) {
+fn render_tool_request(req: &ToolRequest, theme: Theme, debug: bool) {
     match &req.tool_call {
         Ok(call) => match call.name.as_str() {
-            "developer__text_editor" => render_text_editor_request(call),
-            "developer__shell" => render_shell_request(call),
-            _ => render_default_request(call),
+            "developer__text_editor" => render_text_editor_request(call, debug),
+            "developer__shell" => render_shell_request(call, debug),
+            _ => render_default_request(call, debug),
         },
         Err(e) => print_markdown(&e.to_string(), theme),
     }
 }
 
-fn render_tool_response(resp: &ToolResponse, theme: Theme) {
+fn render_tool_response(resp: &ToolResponse, theme: Theme, debug: bool) {
     let config = Config::global();
 
     match &resp.tool_result {
@@ -157,12 +157,14 @@ fn render_tool_response(resp: &ToolResponse, theme: Theme) {
                 if content
                     .priority()
                     .is_some_and(|priority| priority < min_priority)
-                    || content.priority().is_none()
+                    || (content.priority().is_none() && !debug)
                 {
                     continue;
                 }
 
-                if let mcp_core::content::Content::Text(text) = content {
+                if debug {
+                    println!("{:#?}", content);
+                } else if let mcp_core::content::Content::Text(text) = content {
                     print_markdown(&text.text, theme);
                 }
             }
@@ -266,7 +268,7 @@ pub fn render_builtin_error(names: &str, error: &str) {
     println!();
 }
 
-fn render_text_editor_request(call: &ToolCall) {
+fn render_text_editor_request(call: &ToolCall, debug: bool) {
     print_tool_header(call);
 
     // Print path first with special formatting
@@ -274,7 +276,7 @@ fn render_text_editor_request(call: &ToolCall) {
         println!(
             "{}: {}",
             style("path").dim(),
-            style(shorten_path(path)).green()
+            style(shorten_path(path, debug)).green()
         );
     }
 
@@ -286,26 +288,26 @@ fn render_text_editor_request(call: &ToolCall) {
                 other_args.insert(k.clone(), v.clone());
             }
         }
-        print_params(&Value::Object(other_args), 0);
+        print_params(&Value::Object(other_args), 0, debug);
     }
     println!();
 }
 
-fn render_shell_request(call: &ToolCall) {
+fn render_shell_request(call: &ToolCall, debug: bool) {
     print_tool_header(call);
 
     match call.arguments.get("command") {
         Some(Value::String(s)) => {
             println!("{}: {}", style("command").dim(), style(s).green());
         }
-        _ => print_params(&call.arguments, 0),
+        _ => print_params(&call.arguments, 0, debug),
     }
     println!();
 }
 
-fn render_default_request(call: &ToolCall) {
+fn render_default_request(call: &ToolCall, debug: bool) {
     print_tool_header(call);
-    print_params(&call.arguments, 0);
+    print_params(&call.arguments, 0, debug);
     println!();
 }
 
@@ -342,7 +344,7 @@ fn print_markdown(content: &str, theme: Theme) {
 const MAX_STRING_LENGTH: usize = 40;
 const INDENT: &str = "    ";
 
-fn print_params(value: &Value, depth: usize) {
+fn print_params(value: &Value, depth: usize, debug: bool) {
     let indent = INDENT.repeat(depth);
 
     match value {
@@ -351,17 +353,17 @@ fn print_params(value: &Value, depth: usize) {
                 match val {
                     Value::Object(_) => {
                         println!("{}{}:", indent, style(key).dim());
-                        print_params(val, depth + 1);
+                        print_params(val, depth + 1, debug);
                     }
                     Value::Array(arr) => {
                         println!("{}{}:", indent, style(key).dim());
                         for item in arr.iter() {
                             println!("{}{}- ", indent, INDENT);
-                            print_params(item, depth + 2);
+                            print_params(item, depth + 2, debug);
                         }
                     }
                     Value::String(s) => {
-                        if s.len() > MAX_STRING_LENGTH {
+                        if !debug && s.len() > MAX_STRING_LENGTH {
                             println!("{}{}: {}", indent, style(key).dim(), style("...").dim());
                         } else {
                             println!("{}{}: {}", indent, style(key).dim(), style(s).green());
@@ -382,11 +384,11 @@ fn print_params(value: &Value, depth: usize) {
         Value::Array(arr) => {
             for (i, item) in arr.iter().enumerate() {
                 println!("{}{}.", indent, i + 1);
-                print_params(item, depth + 1);
+                print_params(item, depth + 1, debug);
             }
         }
         Value::String(s) => {
-            if s.len() > MAX_STRING_LENGTH {
+            if !debug && s.len() > MAX_STRING_LENGTH {
                 println!(
                     "{}{}",
                     indent,
@@ -408,7 +410,12 @@ fn print_params(value: &Value, depth: usize) {
     }
 }
 
-fn shorten_path(path: &str) -> String {
+fn shorten_path(path: &str, debug: bool) -> String {
+    // In debug mode, return the full path
+    if debug {
+        return path.to_string();
+    }
+
     let path = Path::new(path);
 
     // First try to convert to ~ if it's in home directory
@@ -485,9 +492,17 @@ mod tests {
 
     #[test]
     fn test_short_paths_unchanged() {
-        assert_eq!(shorten_path("/usr/bin"), "/usr/bin");
-        assert_eq!(shorten_path("/a/b/c"), "/a/b/c");
-        assert_eq!(shorten_path("file.txt"), "file.txt");
+        assert_eq!(shorten_path("/usr/bin", false), "/usr/bin");
+        assert_eq!(shorten_path("/a/b/c", false), "/a/b/c");
+        assert_eq!(shorten_path("file.txt", false), "file.txt");
+    }
+
+    #[test]
+    fn test_debug_mode_returns_full_path() {
+        assert_eq!(
+            shorten_path("/very/long/path/that/would/normally/be/shortened", true),
+            "/very/long/path/that/would/normally/be/shortened"
+        );
     }
 
     #[test]
@@ -499,13 +514,13 @@ mod tests {
         env::set_var("HOME", "/Users/testuser");
 
         assert_eq!(
-            shorten_path("/Users/testuser/documents/file.txt"),
+            shorten_path("/Users/testuser/documents/file.txt", false),
             "~/documents/file.txt"
         );
 
         // A path that starts similarly to home but isn't in home
         assert_eq!(
-            shorten_path("/Users/testuser2/documents/file.txt"),
+            shorten_path("/Users/testuser2/documents/file.txt", false),
             "/Users/testuser2/documents/file.txt"
         );
 
@@ -521,7 +536,8 @@ mod tests {
     fn test_long_path_shortening() {
         assert_eq!(
             shorten_path(
-                "/vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv/long/path/with/many/components/file.txt"
+                "/vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv/long/path/with/many/components/file.txt",
+                false
             ),
             "/v/l/p/w/m/components/file.txt"
         );