Small model naming (#7394)

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

crates/goose/src/prompts/session_name.md

@@ -1,4 +1,5 @@
-Generate a short title (four words or less) that describes the topic of the user's messages. Reply with only the title, nothing else.
+Generate a short title (four words or less) that describes the topic of the user's messages. 
+Reply with only the title, nothing else. Do not show your reasoning.
 
 Examples:
 - "how do I reverse a list in python?" → Python list reversal

crates/goose/src/providers/base.rs

@@ -33,6 +33,58 @@ fn strip_xml_tags(text: &str) -> String {
     TAG_RE.replace_all(&pass1, "").into_owned()
 }
 
+fn extract_short_title(text: &str) -> String {
+    let word_count = text.split_whitespace().count();
+    if word_count <= 8 {
+        return text.to_string();
+    }
+
+    {
+        let mut results = Vec::new();
+        let mut quote_char: Option<char> = None;
+        let mut current = String::new();
+        let mut prev_char: Option<char> = None;
+
+        for ch in text.chars() {
+            match quote_char {
+                None => {
+                    if matches!(ch, '"' | '\'' | '`') {
+                        let after_alnum = prev_char.map(|p| p.is_alphanumeric()).unwrap_or(false);
+                        if !after_alnum {
+                            quote_char = Some(ch);
+                            current.clear();
+                        }
+                    }
+                }
+                Some(q) => {
+                    if ch == q {
+                        let trimmed = current.trim().to_string();
+                        let wc = trimmed.split_whitespace().count();
+                        if (2..=8).contains(&wc) {
+                            results.push(trimmed);
+                        }
+                        quote_char = None;
+                        current.clear();
+                    } else {
+                        current.push(ch);
+                    }
+                }
+            }
+            prev_char = Some(ch);
+        }
+
+        if let Some(title) = results.last() {
+            return title.clone();
+        }
+    }
+
+    if let Some(last) = text.lines().rev().find(|l| !l.trim().is_empty()) {
+        return last.trim().to_string();
+    }
+
+    text.to_string()
+}
+
 /// A global store for the current model being used, we use this as when a provider returns, it tells us the real model, not an alias
 pub static CURRENT_MODEL: Lazy<Mutex<Option<String>>> = Lazy::new(|| Mutex::new(None));
 
@@ -632,7 +684,7 @@ pub trait Provider: Send + Sync {
             .collect::<Vec<_>>()
             .join(" ");
 
-        Ok(safe_truncate(&description, 100))
+        Ok(safe_truncate(&extract_short_title(&description), 100))
     }
 
     /// Configure OAuth authentication for this provider
@@ -752,6 +804,60 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_extract_short_title() {
+        assert_eq!(extract_short_title("List files"), "List files");
+        assert_eq!(
+            extract_short_title(
+                r#"blah blah blah blah blah blah blah blah blah "List files in folder""#
+            ),
+            "List files in folder"
+        );
+        assert_eq!(
+            extract_short_title(
+                "blah blah blah blah blah blah blah blah blah `View current files`"
+            ),
+            "View current files"
+        );
+        assert_eq!(
+            extract_short_title(
+                r#"stuff stuff stuff stuff stuff stuff stuff stuff "Abc title" "Zzz title""#
+            ),
+            "Zzz title"
+        );
+        assert_eq!(
+            extract_short_title(
+                "long long long long long long long long long\nList files in folder"
+            ),
+            "List files in folder"
+        );
+        assert_eq!(
+            extract_short_title(
+                r#"lots of words here and there and more and more "single" final line here"#
+            ),
+            "lots of words here and there and more and more \"single\" final line here"
+        );
+        assert_eq!(extract_short_title("Hello world"), "Hello world");
+        assert_eq!(
+            extract_short_title(
+                r#"1. Analyze the request. 2. The user's message says list files. 3. "List current folder files" fits perfectly. Result: List current folder files"#
+            ),
+            "List current folder files"
+        );
+        assert_eq!(
+            extract_short_title(
+                r#"the user's phrasing is about listing files and the user's intent is clear. "List folder files" is best"#
+            ),
+            "List folder files"
+        );
+        assert_eq!(
+            extract_short_title(
+                "lots of reasoning here about what to call it\nList current folder files"
+            ),
+            "List current folder files"
+        );
+    }
+
     #[test]
     fn test_usage_creation() {
         let usage = Usage::new(Some(10), Some(20), Some(30));