feat(mcp): external registry + agent ctx + Streamable HTTP server

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

tests/mcp/external_registry.test.js

@@ -0,0 +1,52 @@
+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 * as agentsRepo from '../../lib/db/repos/agents.js';
+import { buildCtxFromAgent } from '../../lib/mcp/context.js';
+import { listExternalTools, callExternalTool } from '../../lib/mcp/http.js';
+
+let spaceId, otherSpace, pageInOther, agent;
+const owner = { kind: 'user', id: null };
+beforeAll(async () => {
+  await resetDb(); await migrateUp();
+  ({ rows: [{ id: spaceId }] } = await pool.query(`INSERT INTO spaces(slug,name) VALUES('s','S') RETURNING id`));
+  ({ rows: [{ id: otherSpace }] } = await pool.query(`INSERT INTO spaces(slug,name) VALUES('o','O') RETURNING id`));
+  ({ rows: [{ id: pageInOther }] } = await pool.query(
+    `INSERT INTO pages(space_id,slug,title,body_md) VALUES($1,'sec','Secret','hidden') RETURNING id`, [otherSpace]));
+  agent = await agentsRepo.create({
+    slug: `ext-${Date.now()}`, name: 'Ext', kind: 'claude', model: 'sonnet',
+    capabilities: { read: true, suggest: true }, scopes: { space_id: spaceId }
+  }, owner);
+});
+
+describe('external registry', () => {
+  it('exposes exactly the four read+suggest tools', () => {
+    const names = listExternalTools().map(t => t.name).sort();
+    expect(names).toEqual(['context', 'propose_change', 'read', 'search']);
+  });
+  it('buildCtxFromAgent forces the agent bound space + spaceScoped', () => {
+    const ctx = buildCtxFromAgent(agent);
+    expect(ctx.space_id).toBe(spaceId);
+    expect(ctx.spaceScoped).toBe(true);
+    expect(ctx.agent.id).toBe(agent.id);
+  });
+  it('read cannot reach another space', async () => {
+    const ctx = buildCtxFromAgent(agent);
+    const out = await callExternalTool('read', { kind: 'page', id: pageInOther }, ctx);
+    expect(out.error).toMatch(/not found/i);
+  });
+  it('propose_change lands in pending_changes with agent + space, applied:false', async () => {
+    const ctx = buildCtxFromAgent(agent);
+    const out = await callExternalTool('propose_change',
+      { entity_type: 'page', action: 'create', payload: { slug: 'np', title: 'New', body_md: 'b' }, reason: 'r' }, ctx);
+    expect(out.applied).toBe(false);
+    expect(out.pending_change_id).toBeTruthy();
+    const { rows: [pc] } = await pool.query(`SELECT * FROM pending_changes WHERE id=$1`, [out.pending_change_id]);
+    expect(pc.agent_id).toBe(agent.id);
+    expect(pc.payload.space_id).toBe(spaceId);
+  });
+  it('unknown tool throws', async () => {
+    await expect(callExternalTool('nope', {}, buildCtxFromAgent(agent))).rejects.toThrow(/unknown tool/i);
+  });
+});