fix(cli): sync slash help with builtins (#10173)

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

@@ -1,3 +1,4 @@
+use goose::agents::execute_commands::list_commands;
 use goose::config::GooseMode;
 use rustyline::completion::{Completer, FilenameCompleter, Pair};
 use rustyline::highlight::{CmdKind, Highlighter};
@@ -152,23 +153,25 @@ impl GooseCompleter {
 
     /// Complete slash commands
     fn complete_slash_commands(&self, line: &str) -> Result<(usize, Vec<Pair>)> {
-        // Define available slash commands
-        let commands = [
-            "/exit",
-            "/quit",
-            "/help",
-            "/?",
-            "/t",
-            "/extension",
-            "/builtin",
-            "/prompts",
-            "/prompt",
-            "/mode",
-            "/model",
-            "/recipe",
-            "/skills",
-            "/status",
+        let mut commands = vec![
+            "/exit".to_string(),
+            "/quit".to_string(),
+            "/help".to_string(),
+            "/?".to_string(),
+            "/t".to_string(),
+            "/extension".to_string(),
+            "/builtin".to_string(),
+            "/mode".to_string(),
+            "/model".to_string(),
+            "/recipe".to_string(),
         ];
+        commands.extend(
+            list_commands()
+                .iter()
+                .map(|command| format!("/{}", command.name)),
+        );
+        commands.sort();
+        commands.dedup();
 
         // Find commands that match the prefix
         let matching_commands: Vec<Pair> = commands
@@ -578,6 +581,15 @@ mod tests {
         let (pos, candidates) = completer.complete_slash_commands("/").unwrap();
         assert_eq!(pos, 0);
         assert!(candidates.len() > 1);
+        for command in list_commands() {
+            assert!(
+                candidates
+                    .iter()
+                    .any(|candidate| candidate.display == format!("/{}", command.name)),
+                "slash completion should list /{}",
+                command.name
+            );
+        }
 
         // Test no match
         let (_pos, candidates) = completer.complete_slash_commands("/nonexistent").unwrap();

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

@@ -401,10 +401,17 @@ fn parse_plan_command(input: String) -> Option<InputResult> {
     Some(InputResult::Plan(options))
 }
 
-fn print_help() {
+fn help_text() -> String {
     let newline_key = get_newline_key().to_ascii_uppercase();
     let modes = GooseMode::VARIANTS.join(", ");
-    println!(
+    let additional_builtin_help = additional_builtin_help();
+    let additional_builtin_help = if additional_builtin_help.is_empty() {
+        String::new()
+    } else {
+        format!("{additional_builtin_help}\n")
+    };
+
+    format!(
         "Available commands:
 /exit or /quit - Exit the session
 /t - Toggle Light/Dark/Ansi theme
@@ -425,7 +432,7 @@ fn print_help() {
 /recipe [filepath] - Generate a recipe from the current conversation and save it to the specified filepath (must end with .yaml).
                        If no filepath is provided, it will be saved to ./recipe.yaml.
 /compact - Compact the current conversation to reduce context length while preserving key information.
-/status - Show session status: model, provider, mode, and token usage.
+{additional_builtin_help}/status - Show session status: model, provider, mode, and token usage.
 /edit [text] - Open your prompt editor to compose a message. Optionally pre-fill with text.
                Uses $GOOSE_PROMPT_EDITOR, $VISUAL, or $EDITOR (in that order).
 /skills - List available skills or enable skills by name (usage: /skills [<name>...])
@@ -436,7 +443,23 @@ Navigation:
 Ctrl+C - Clear current line if text is entered, otherwise exit the session
 Ctrl+{newline_key} - Add a newline (configurable via GOOSE_CLI_NEWLINE_KEY)
 Up/Down arrows - Navigate through command history"
-    );
+    )
+}
+
+fn additional_builtin_help() -> String {
+    const DOCUMENTED_BUILTINS: &[&str] =
+        &["prompts", "prompt", "compact", "clear", "skills", "status"];
+
+    goose::agents::execute_commands::list_commands()
+        .iter()
+        .filter(|command| !DOCUMENTED_BUILTINS.contains(&command.name))
+        .map(|command| format!("/{} - {}", command.name, command.description))
+        .collect::<Vec<_>>()
+        .join("\n")
+}
+
+fn print_help() {
+    println!("{}", help_text());
 }
 
 /// Extract recent messages for editor context
@@ -535,6 +558,19 @@ mod tests {
         assert!(handle_slash_command("/unknown").is_none());
     }
 
+    #[test]
+    fn help_lists_builtin_agent_commands() {
+        let help = help_text();
+
+        for command in goose::agents::execute_commands::list_commands() {
+            assert!(
+                help.contains(&format!("/{}", command.name)),
+                "help output should list /{}",
+                command.name
+            );
+        }
+    }
+
     #[test]
     fn test_prompts_command() {
         // Test basic prompts command