feat(skill): inject skill root directory path into prompt

mini_agent/tools/skill_loader.py

@@ -26,11 +26,18 @@ class Skill:
 
     def to_prompt(self) -> str:
         """Convert skill to prompt format"""
+        # Inject skill root directory path for context
+        skill_root = str(self.skill_path.parent) if self.skill_path else "unknown"
+
         return f"""
 # Skill: {self.name}
 
 {self.description}
 
+**Skill Root Directory:** `{skill_root}`
+
+All files and references in this skill are relative to this directory.
+
 ---
 
 {self.content}

tests/test_skill_loader.py

@@ -244,3 +244,31 @@ def test_script_path_processing():
 
         # Check that script path is converted to absolute
         assert str(skill_dir / "scripts" / "test_script.py") in skill.content
+
+
+def test_skill_to_prompt_includes_root_directory():
+    """Test that to_prompt includes skill root directory path"""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        skill_dir = Path(tmpdir) / "test-skill"
+        skill_dir.mkdir()
+
+        skill_file = skill_dir / "SKILL.md"
+        skill_content = """---
+name: test-skill
+description: A test skill
+---
+
+Skill content here.
+"""
+        skill_file.write_text(skill_content, encoding="utf-8")
+
+        loader = SkillLoader(tmpdir)
+        skill = loader.load_skill(skill_file)
+
+        assert skill is not None
+
+        # Test to_prompt includes root directory
+        prompt = skill.to_prompt()
+        assert "Skill Root Directory" in prompt
+        assert str(skill_dir) in prompt
+        assert "All files and references in this skill are relative to this directory" in prompt