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packages/weaver/tests/skill-extractor.test.ts

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+import { describe, it, expect } from 'vitest';
+import { extractSessionSkills } from '../src/skill-extractor.js';
+
+describe('Session Skill Extraction', () => {
+  it('extracts repeated tool usage patterns', () => {
+    const entries = [
+      { role: 'user', content: 'Find all TypeScript files' },
+      { role: 'agent', content: 'Found 42 files.', tools_used: ['search_files'] },
+      { role: 'user', content: 'Find all test files' },
+      { role: 'agent', content: 'Found 20 files.', tools_used: ['search_files'] },
+    ];
+    const skills = extractSessionSkills(entries);
+    expect(skills.length).toBeGreaterThanOrEqual(1);
+    expect(skills.some(s => s.tools.includes('search_files'))).toBe(true);
+  });
+
+  it('returns empty for trivial conversations', () => {
+    const entries = [
+      { role: 'user', content: 'Hi' },
+      { role: 'agent', content: 'Hello!', tools_used: [] },
+    ];
+    expect(extractSessionSkills(entries)).toEqual([]);
+  });
+
+  it('extracts multi-tool patterns at frequency 1', () => {
+    const entries = [
+      { role: 'user', content: 'Search and edit the config' },
+      { role: 'agent', content: 'Done.', tools_used: ['search_files', 'edit_file'] },
+    ];
+    const skills = extractSessionSkills(entries);
+    expect(skills.length).toBe(1);
+    expect(skills[0].tools).toContain('search_files');
+    expect(skills[0].tools).toContain('edit_file');
+    expect(skills[0].frequency).toBe(1);
+  });
+
+  it('ignores single-tool patterns with frequency 1', () => {
+    const entries = [
+      { role: 'user', content: 'Read the file' },
+      { role: 'agent', content: 'Here it is.', tools_used: ['read_file'] },
+    ];
+    const skills = extractSessionSkills(entries);
+    expect(skills).toEqual([]);
+  });
+
+  it('skips non user→agent pairs', () => {
+    const entries = [
+      { role: 'agent', content: 'Welcome!' },
+      { role: 'agent', content: 'Done.', tools_used: ['search_files'] },
+    ];
+    const skills = extractSessionSkills(entries);
+    expect(skills).toEqual([]);
+  });
+});