diff --git a/crates/goose-cli/src/session/input.rs b/crates/goose-cli/src/session/input.rs
index 34d385291f26..ef82a4900df8 100644
--- a/crates/goose-cli/src/session/input.rs
+++ b/crates/goose-cli/src/session/input.rs
@@ -21,6 +21,7 @@ pub enum InputResult {
     Clear,
     Recipe(Option<String>),
     Compact,
+    ToggleFullToolOutput,
 }
 
 #[derive(Debug)]
@@ -189,6 +190,7 @@ fn handle_slash_command(input: &str) -> Option<InputResult> {
             println!("{}", console::style("⚠️  Note: /summarize has been renamed to /compact and will be removed in a future release.").yellow());
             Some(InputResult::Compact)
         }
+        "/r" => Some(InputResult::ToggleFullToolOutput),
         _ => None,
     }
 }
@@ -300,6 +302,7 @@ fn print_help() {
 /exit or /quit - Exit the session
 /t - Toggle Light/Dark/Ansi theme
 /t <name> - Set theme directly (light, dark, ansi)
+/r - Toggle full tool output display (show complete tool parameters without truncation)
 /extension <command> - Add a stdio extension (format: ENV1=val1 command args...)
 /builtin <names> - Add builtin extensions by name (comma-separated)
 /prompts [--extension <name>] - List all available prompts, optionally filtered by extension
@@ -356,6 +359,12 @@ mod tests {
             Some(InputResult::ToggleTheme)
         ));
 
+        // Test full tool output toggle
+        assert!(matches!(
+            handle_slash_command("/r"),
+            Some(InputResult::ToggleFullToolOutput)
+        ));
+
         // Test extension command
         if let Some(InputResult::AddExtension(cmd)) = handle_slash_command("/extension foo bar") {
             assert_eq!(cmd, "foo bar");
diff --git a/crates/goose-cli/src/session/mod.rs b/crates/goose-cli/src/session/mod.rs
index 8f63894a104c..3b420fb2fb07 100644
--- a/crates/goose-cli/src/session/mod.rs
+++ b/crates/goose-cli/src/session/mod.rs
@@ -507,6 +507,10 @@ impl CliSession {
                 history.save(editor);
                 self.handle_toggle_theme();
             }
+            InputResult::ToggleFullToolOutput => {
+                history.save(editor);
+                self.handle_toggle_full_tool_output();
+            }
             InputResult::SelectTheme(theme_name) => {
                 history.save(editor);
                 self.handle_select_theme(&theme_name);
@@ -635,6 +639,27 @@ impl CliSession {
         output::set_theme(new_theme);
     }
 
+    fn handle_toggle_full_tool_output(&self) {
+        let enabled = output::toggle_full_tool_output();
+        if enabled {
+            println!(
+                "{}",
+                console::style(
+                    "✓ Full tool output enabled - tool parameters will no longer be truncated"
+                )
+                .green()
+            );
+        } else {
+            println!(
+                "{}",
+                console::style(
+                    "✓ Full tool output disabled - tool parameters will be truncated to fit terminal width"
+                )
+                .dim()
+            );
+        }
+    }
+
     fn handle_goose_mode(&self, mode: &str) -> Result<()> {
         let config = Config::global();
         let mode = match GooseMode::from_str(&mode.to_lowercase()) {
diff --git a/crates/goose-cli/src/session/output.rs b/crates/goose-cli/src/session/output.rs
index 6c38b9f4de57..1c01eaad4d9a 100644
--- a/crates/goose-cli/src/session/output.rs
+++ b/crates/goose-cli/src/session/output.rs
@@ -63,6 +63,7 @@ thread_local! {
                     .unwrap_or(Theme::Ansi)
             )
     );
+    static SHOW_FULL_TOOL_OUTPUT: RefCell<bool> = const { RefCell::new(false) };
 }
 
 pub fn set_theme(theme: Theme) {
@@ -88,6 +89,18 @@ pub fn get_theme() -> Theme {
     CURRENT_THEME.with(|t| *t.borrow())
 }
 
+pub fn toggle_full_tool_output() -> bool {
+    SHOW_FULL_TOOL_OUTPUT.with(|s| {
+        let mut val = s.borrow_mut();
+        *val = !*val;
+        *val
+    })
+}
+
+pub fn get_show_full_tool_output() -> bool {
+    SHOW_FULL_TOOL_OUTPUT.with(|s| *s.borrow())
+}
+
 // Simple wrapper around spinner to manage its state
 #[derive(Default)]
 pub struct ThinkingIndicator {
@@ -612,8 +625,9 @@ fn print_value(value: &Value, debug: bool, reserve_width: usize) {
     let max_width = Term::stdout()
         .size_checked()
         .map(|(_h, w)| (w as usize).saturating_sub(reserve_width));
+    let show_full = get_show_full_tool_output();
     let formatted = match value {
-        Value::String(s) => match (max_width, debug) {
+        Value::String(s) => match (max_width, debug || show_full) {
             (Some(w), false) if s.len() > w => style(safe_truncate(s, w)),
             _ => style(s.to_string()),
         }
@@ -990,6 +1004,19 @@ mod tests {
         }
     }
 
+    #[test]
+    fn test_toggle_full_tool_output() {
+        let initial = get_show_full_tool_output();
+
+        let after_first_toggle = toggle_full_tool_output();
+        assert_eq!(after_first_toggle, !initial);
+        assert_eq!(get_show_full_tool_output(), after_first_toggle);
+
+        let after_second_toggle = toggle_full_tool_output();
+        assert_eq!(after_second_toggle, initial);
+        assert_eq!(get_show_full_tool_output(), initial);
+    }
+
     #[test]
     fn test_long_path_shortening() {
         assert_eq!(