feat(skills): add .cursor/skills to skill discovery paths (#817)

* feat(skills): add .cursor/skills to skill discovery paths

    Adds Cursor IDE interop by scanning .cursor/skills alongside the
    existing .opencode/skills and .claude/skills directories (#432).
    Precedence: .agents/skills > skills > .opencode/skills >
    .claude/skills > .cursor/skills > ~/.deepseek/skills.

* test(skills): cover cursor skills discovery

---------

Co-authored-by: ornn.ban <ornn.ban@biuya.com>
Co-authored-by: Hunter Bown <hmbown@gmail.com>

crates/tui/src/prompts.rs

@@ -382,8 +382,8 @@ pub fn system_prompt_for_mode_with_context_skills_session_and_approval(
 
     // 3. Skills block. #432: walks every candidate workspace
     // skills directory (`.agents/skills`, `skills`,
-    // `.opencode/skills`, `.claude/skills`) plus the global
-    // default so skills installed for any AI-tool convention show
+    // `.opencode/skills`, `.claude/skills`, `.cursor/skills`) plus the
+    // global default so skills installed for any AI-tool convention show
     // up in the catalogue. The legacy single-`skills_dir` path is
     // honoured as a fallback for callers that don't supply a
     // workspace-aware view; it falls through to the same merged

crates/tui/src/skills/mod.rs

@@ -300,7 +300,8 @@ pub fn resolve_skills_dir(workspace: &Path) -> PathBuf {
 /// 2. `<workspace>/skills` — flat, project-local.
 /// 3. `<workspace>/.opencode/skills` — OpenCode interop.
 /// 4. `<workspace>/.claude/skills` — Claude Code interop.
-/// 5. [`default_skills_dir`] — global, user-installed.
+/// 5. `<workspace>/.cursor/skills` — Cursor interop.
+/// 6. [`default_skills_dir`] — global, user-installed.
 ///
 /// Only directories that exist on disk are returned — callers don't
 /// need to filter further. Returns an empty vec when nothing is
@@ -312,6 +313,7 @@ pub fn skills_directories(workspace: &Path) -> Vec<PathBuf> {
         workspace.join("skills"),
         workspace.join(".opencode").join("skills"),
         workspace.join(".claude").join("skills"),
+        workspace.join(".cursor").join("skills"),
         default_skills_dir(),
     ];
     let mut out = Vec::new();
@@ -665,10 +667,11 @@ mod tests {
         let tmpdir = TempDir::new().unwrap();
         let workspace = tmpdir.path();
 
-        // Create three of the four candidate dirs (skip `.opencode`).
+        // Create four of the five workspace candidate dirs (skip `.opencode`).
         std::fs::create_dir_all(workspace.join(".agents").join("skills")).unwrap();
         std::fs::create_dir_all(workspace.join("skills")).unwrap();
         std::fs::create_dir_all(workspace.join(".claude").join("skills")).unwrap();
+        std::fs::create_dir_all(workspace.join(".cursor").join("skills")).unwrap();
 
         let dirs = super::skills_directories(workspace);
         // We don't assert on the global default position because it's
@@ -677,6 +680,7 @@ mod tests {
         let agents = workspace.join(".agents").join("skills");
         let local = workspace.join("skills");
         let claude = workspace.join(".claude").join("skills");
+        let cursor = workspace.join(".cursor").join("skills");
 
         assert_eq!(dirs.get(idx), Some(&agents), "agents must come first");
         idx += 1;
@@ -690,6 +694,12 @@ mod tests {
             "missing dir must be omitted, got: {dirs:?}"
         );
         assert_eq!(dirs.get(idx), Some(&claude), "claude must come after local");
+        idx += 1;
+        assert_eq!(
+            dirs.get(idx),
+            Some(&cursor),
+            "cursor must come after claude"
+        );
     }
 
     #[test]
@@ -757,6 +767,24 @@ mod tests {
         );
     }
 
+    #[test]
+    fn discover_in_workspace_pulls_skills_from_cursor_dir() {
+        let tmpdir = TempDir::new().unwrap();
+        let workspace = tmpdir.path();
+        write_skill(
+            &workspace.join(".cursor").join("skills"),
+            "cursor-only",
+            "for cursor interop",
+            "body",
+        );
+
+        let registry = super::discover_in_workspace(workspace);
+        assert!(
+            registry.get("cursor-only").is_some(),
+            ".cursor/skills must be scanned"
+        );
+    }
+
     #[test]
     fn render_available_skills_context_for_workspace_picks_up_cross_tool_dirs() {
         let tmpdir = TempDir::new().unwrap();

crates/tui/src/tools/skill.rs

@@ -86,7 +86,8 @@ impl ToolSpec for LoadSkillTool {
 
         // #432: walk every candidate skill directory (workspace
         // .agents/skills, skills, .opencode/skills, .claude/skills,
-        // global default), merging with first-wins precedence. The
+        // .cursor/skills, global default), merging with first-wins
+        // precedence. The
         // tool's lookup mirrors what the system-prompt skills block
         // already lists, so the model never asks for a name it
         // can't find.