Make the system prompt smaller (#6991)

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

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

@@ -549,15 +549,10 @@ async fn configure_session_prompts(
         tracing::warn!("Failed to save extension state: {}", e);
     }
 
-    session
-        .agent
-        .extend_system_prompt(super::prompt::get_cli_prompt())
-        .await;
-
     if let Some(ref additional_prompt) = session_config.additional_system_prompt {
         session
             .agent
-            .extend_system_prompt(additional_prompt.clone())
+            .extend_system_prompt("additional".to_string(), additional_prompt.clone())
             .await;
     }
 

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

@@ -5,7 +5,6 @@ mod elicitation;
 mod export;
 mod input;
 mod output;
-mod prompt;
 mod task_execution_display;
 mod thinking;
 

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

@@ -1,17 +0,0 @@
-/// Returns a system prompt extension that explains CLI-specific functionality
-pub fn get_cli_prompt() -> String {
-    let newline_key = super::input::get_newline_key().to_ascii_uppercase();
-    format!(
-        "You are being accessed through a command-line interface. The following slash commands are available
-- you can let the user know about them if they need help:
-
-- /exit or /quit - Exit the session
-- /t - Toggle between Light/Dark/Ansi themes
-- /? or /help - Display help message
-
-Additional keyboard shortcuts:
-- Ctrl+C - Interrupt the current interaction (resets to before the interrupted request)
-- Ctrl+{newline_key} - Add a newline
-- Up/Down arrows - Navigate command history"
-    )
-}