Paginate regex and path search tools (#26997)

<img width="630" alt="Screenshot 2025-03-18 at 10 50 17 AM"
src="https://github.com/user-attachments/assets/0aee5367-402a-405a-8676-f2f8af425b1e"
/>

Release Notes:

- N/A

crates/assistant_tools/src/path_search_tool.rs

@@ -23,8 +23,15 @@ pub struct PathSearchToolInput {
     /// You can get back the first two paths by providing a glob of "*thing*.txt"
     /// </example>
     pub glob: String,
+
+    /// Optional starting position for paginated results (0-based).
+    /// When not provided, starts from the beginning.
+    #[serde(default)]
+    pub offset: Option<usize>,
 }
 
+const RESULTS_PER_PAGE: usize = 50;
+
 pub struct PathSearchTool;
 
 impl Tool for PathSearchTool {
@@ -49,8 +56,8 @@ impl Tool for PathSearchTool {
         _action_log: Entity<ActionLog>,
         cx: &mut App,
     ) -> Task<Result<String>> {
-        let glob = match serde_json::from_value::<PathSearchToolInput>(input) {
-            Ok(input) => input.glob,
+        let (offset, glob) = match serde_json::from_value::<PathSearchToolInput>(input) {
+            Ok(input) => (input.offset.unwrap_or(0), input.glob),
             Err(err) => return Task::ready(Err(anyhow!(err))),
         };
         let path_matcher = match PathMatcher::new(&[glob.clone()]) {
@@ -87,7 +94,27 @@ impl Tool for PathSearchTool {
             } else {
                 // Sort to group entries in the same directory together.
                 matches.sort();
-                Ok(matches.join("\n"))
+
+                let total_matches = matches.len();
+                let response = if total_matches > offset + RESULTS_PER_PAGE {
+                  let paginated_matches: Vec<_> = matches
+                      .into_iter()
+                      .skip(offset)
+                      .take(RESULTS_PER_PAGE)
+                      .collect();
+
+                    format!(
+                        "Found {} total matches. Showing results {}-{} (provide 'offset' parameter for more results):\n\n{}",
+                        total_matches,
+                        offset + 1,
+                        offset + paginated_matches.len(),
+                        paginated_matches.join("\n")
+                    )
+                } else {
+                    matches.join("\n")
+                };
+
+                Ok(response)
             }
         })
     }