feat: add canonical typed tool outputs

packages/examples/acp-demo/tests/acp-agent.spec.ts

@@ -203,7 +203,8 @@ describe('dsh-acp-demo composition', () => {
         name,
         description: name,
         parameters: {},
-        execute: async () => [],
+        output: { schema: { type: 'null' }, render: () => [] },
+        execute: async () => null,
       })
     }
     const assembly = await ctx.get('systemPrompt')!.assemble()

packages/examples/agent-spine-demo/tests/agent-core.spec.ts

@@ -494,7 +494,8 @@ describe('dsh-agent-spine-demo bundle', () => {
         name,
         description: name,
         parameters: {},
-        execute: async () => [],
+        output: { schema: { type: 'null' }, render: () => [] },
+        execute: async () => null,
       })
     }
     const assembly = await ctx.get('systemPrompt')!.assemble()

packages/examples/cli-demo/tests/cli-demo.spec.ts

@@ -95,7 +95,13 @@ describe('dsh-cli-demo app composition', () => {
     })
     ctx.skills.register({ name: 'cli-skill', description: 'CLI skill', source: 'runtime', content: 'body' })
     for (const name of ['alpha', 'zulu']) {
-      ctx.tools.register({ name, description: name, parameters: {}, execute: async () => [] })
+      ctx.tools.register({
+        name,
+        description: name,
+        parameters: {},
+        output: { schema: { type: 'null' }, render: () => [] },
+        execute: async () => null,
+      })
     }
     expect(JSON.stringify(await composePrefix(ctx))).toContain('- `cli-skill`: CLI...')
     expect((await ctx.systemPrompt.assemble()).tools.map(tool => tool.name)).toEqual([

packages/examples/cli-demo/tests/cli.spec.ts

@@ -115,7 +115,11 @@ async function harness(script: readonly ScriptEntry[]): Promise<Harness> {
     name: 'echo',
     description: 'Echo text.',
     parameters: { text: { type: 'string', required: true } },
-    execute: async args => [{ type: 'text', text: `ECHO: ${(args as { text: string }).text}` }],
+    output: {
+      schema: { type: 'string' },
+      render: (_args, value) => [{ type: 'text', text: value as string }],
+    },
+    execute: async args => `ECHO: ${(args as { text: string }).text}`,
   })
   const [agent] = ctx.agents.roots()
   if (agent === undefined) throw new Error('test main agent missing')