feat(ai): propose_change tool — drafts to pending_changes, never applies

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/ai/agent/tools/propose_change.test.js

@@ -0,0 +1,43 @@
+import { describe, it, expect, beforeAll } from 'vitest';
+import { pool } from '../../../../lib/db/pool.js';
+import { resetDb } from '../../../helpers/db.js';
+import { migrateUp } from '../../../../lib/db/migrate.js';
+import { proposeChangeTool } from '../../../../lib/ai/agent/tools/propose_change.js';
+
+let spaceId, agentId;
+beforeAll(async () => {
+  await resetDb(); await migrateUp();
+  ({ rows: [{ id: spaceId }] } = await pool.query(
+    `INSERT INTO spaces(slug,name) VALUES('s','S') RETURNING id`));
+  ({ rows: [{ id: agentId }] } = await pool.query(`SELECT id FROM agents WHERE slug='companion'`));
+});
+
+const suggestAgent = (id) => ({ kind: 'agent', id, capabilities: { read: true, suggest: true, write: false }, scopes: {} });
+
+describe('propose_change tool', () => {
+  it('writes a pending_changes row and never applies', async () => {
+    const ctx = { agent: suggestAgent(agentId), space_id: spaceId };
+    const out = await proposeChangeTool.handler(
+      { entity_type: 'task', action: 'create', payload: { space_id: spaceId, title: 'Validate CSV' }, reason: 'tracking' },
+      ctx
+    );
+    expect(out.pending_change_id).toBeTruthy();
+    expect(out.applied).toBe(false);
+
+    const { rows } = await pool.query(`SELECT * FROM pending_changes WHERE id=$1`, [out.pending_change_id]);
+    expect(rows[0].status).toBe('pending');
+    expect(rows[0].agent_id).toBe(agentId);
+
+    const { rows: tasks } = await pool.query(`SELECT * FROM tasks WHERE title='Validate CSV'`);
+    expect(tasks).toHaveLength(0); // not applied
+  });
+
+  it('refuses when the agent cannot even suggest', async () => {
+    const denied = { kind: 'agent', id: agentId, capabilities: { read: true, suggest: false, write: false }, scopes: {} };
+    const out = await proposeChangeTool.handler(
+      { entity_type: 'task', action: 'create', payload: { title: 'x' } },
+      { agent: denied, space_id: spaceId }
+    );
+    expect(out.error).toMatch(/not permitted/i);
+  });
+});