fix: Handle colons in skill description frontmatter (#16345)

Co-authored-by: gemini-code-assist[bot] <gemini-code-assist[bot]@users.noreply.github.com>

packages/core/src/skills/skillLoader.test.ts

@@ -100,4 +100,98 @@ describe('skillLoader', () => {
     expect(skills).toEqual([]);
     expect(coreEvents.emitFeedback).not.toHaveBeenCalled();
   });
+
+  it('should parse skill with colon in description (issue #16323)', async () => {
+    const skillDir = path.join(testRootDir, 'colon-skill');
+    await fs.mkdir(skillDir, { recursive: true });
+    const skillFile = path.join(skillDir, 'SKILL.md');
+    await fs.writeFile(
+      skillFile,
+      `---
+name: foo
+description: Simple story generation assistant for fiction writing. Use for creating characters, scenes, storylines, and prose. Trigger words: character, scene, storyline, story, prose, fiction, writing.
+---
+# Instructions
+Do something.
+`,
+    );
+
+    const skills = await loadSkillsFromDir(testRootDir);
+
+    expect(skills).toHaveLength(1);
+    expect(skills[0].name).toBe('foo');
+    expect(skills[0].description).toContain('Trigger words:');
+  });
+
+  it('should parse skill with multiple colons in description', async () => {
+    const skillDir = path.join(testRootDir, 'multi-colon-skill');
+    await fs.mkdir(skillDir, { recursive: true });
+    const skillFile = path.join(skillDir, 'SKILL.md');
+    await fs.writeFile(
+      skillFile,
+      `---
+name: multi-colon
+description: Use this for tasks like: coding, reviewing, testing. Keywords: async, await, promise.
+---
+# Instructions
+Do something.
+`,
+    );
+
+    const skills = await loadSkillsFromDir(testRootDir);
+
+    expect(skills).toHaveLength(1);
+    expect(skills[0].name).toBe('multi-colon');
+    expect(skills[0].description).toContain('tasks like:');
+    expect(skills[0].description).toContain('Keywords:');
+  });
+
+  it('should parse skill with quoted YAML description (backward compatibility)', async () => {
+    const skillDir = path.join(testRootDir, 'quoted-skill');
+    await fs.mkdir(skillDir, { recursive: true });
+    const skillFile = path.join(skillDir, 'SKILL.md');
+    await fs.writeFile(
+      skillFile,
+      `---
+name: quoted-skill
+description: "A skill with colons: like this one: and another."
+---
+# Instructions
+Do something.
+`,
+    );
+
+    const skills = await loadSkillsFromDir(testRootDir);
+
+    expect(skills).toHaveLength(1);
+    expect(skills[0].name).toBe('quoted-skill');
+    expect(skills[0].description).toBe(
+      'A skill with colons: like this one: and another.',
+    );
+  });
+
+  it('should parse skill with multi-line YAML description', async () => {
+    const skillDir = path.join(testRootDir, 'multiline-skill');
+    await fs.mkdir(skillDir, { recursive: true });
+    const skillFile = path.join(skillDir, 'SKILL.md');
+    await fs.writeFile(
+      skillFile,
+      `---
+name: multiline-skill
+description:
+  Expertise in reviewing code for style, security, and performance. Use when the
+  user asks for "feedback," a "review," or to "check" their changes.
+---
+# Instructions
+Do something.
+`,
+    );
+
+    const skills = await loadSkillsFromDir(testRootDir);
+
+    expect(skills).toHaveLength(1);
+    expect(skills[0].name).toBe('multiline-skill');
+    expect(skills[0].description).toContain('Expertise in reviewing code');
+    expect(skills[0].description).toContain('check');
+  });
 });