refactor(agent): align delivery method names

packages/subagent/subagent-inprocess/README.md

@@ -11,7 +11,7 @@ The driver follows this sequence:
 1. Validate the parent depth and optional absolute `maxDepth`, then derive child depth as parent depth plus one and persist it in the child session header.
 2. Call `parent.ctx.agents.create` directly, passing the required request signal into the factory's creation transaction.
 3. During that transaction's unpublished setup window, install the requested persona, tool restriction, and structured-output runtime.
-4. Publish the child, retain the returned `AgentHandle`, and drive one task with `child.send(prompt)` followed by `child.whenIdle()`.
+4. Publish the child, retain the returned `AgentHandle`, and drive one task with `child.followup(prompt)` followed by `child.whenIdle()`.
 5. Read the child's own last assistant message and latest message-triggered turn reason, excluding any fork seed and later plugin-owned zero-step turns.
 
 The child gets the parent's working-directory/session lineage and inherits the parent model unless `request.agentOptions` overrides it. It gets a fresh flat registration scope: parent ownership does not import parent tool restrictions or establish an authority subset.

packages/subagent/subagent-inprocess/src/index.ts

@@ -141,7 +141,7 @@ export async function startInProcessRun(
 
   const result: Promise<SubagentResult> = (async () => {
     try {
-      child.send(request.prompt)
+      child.followup(request.prompt)
       await child.whenIdle()
       return readResult(
         child,

packages/subagent/subagent-inprocess/tests/structured.spec.ts

@@ -522,7 +522,7 @@ describe('in-process structured output', () => {
       textResponse('parent answer'),
       toolCallResponse('c1', STRUCTURED_OUTPUT_TOOL, { answer: 1 }),
     ])
-    parent.send([{ type: 'text', text: 'hello' }])
+    parent.followup([{ type: 'text', text: 'hello' }])
     await parent.whenIdle()
     expect(adapter.requests[0]!.system ?? '').not.toContain(STRUCTURED_OUTPUT_INSTRUCTION)
     const run = await ctx.subagents.start('spawn', structuredRequest(parent))
@@ -538,7 +538,7 @@ describe('in-process structured output', () => {
   describe('scoped registration (each child owns its capture tool)', () => {
     it('a plain agent never sees the tool: nothing is registered globally at all', async () => {
       const { ctx, parent, adapter } = await setup([textResponse('parent answer')])
-      parent.send([{ type: 'text', text: 'hello' }])
+      parent.followup([{ type: 'text', text: 'hello' }])
       await parent.whenIdle()
       // Scoped registration: the global view has no capture tool, ever.
       expect(ctx.tools.get(STRUCTURED_OUTPUT_TOOL)).toBeUndefined()
@@ -552,7 +552,7 @@ describe('in-process structured output', () => {
         // Child turn: must see it, with the run's schema.
         toolCallResponse('c1', STRUCTURED_OUTPUT_TOOL, { answer: 42 }),
       ])
-      parent.send([{ type: 'text', text: 'hello' }])
+      parent.followup([{ type: 'text', text: 'hello' }])
       await parent.whenIdle()
       expect(toolNames(adapter.requests[0]!)).not.toContain(STRUCTURED_OUTPUT_TOOL)
 
@@ -630,7 +630,7 @@ describe('in-process structured output', () => {
 
     it('a non-structured agent request keeps tools ABSENT when it had none (no tools: [] materialized)', async () => {
       const { parent, adapter } = await setup([textResponse('plain')])
-      parent.send([{ type: 'text', text: 'q' }])
+      parent.followup([{ type: 'text', text: 'q' }])
       await parent.whenIdle()
       const request = adapter.requests[0]!
       expect(request.tools).toBeUndefined()

packages/subagent/subagent-inprocess/tests/subagent-inprocess.spec.ts

@@ -87,7 +87,7 @@ describe('startInProcessRun', () => {
 
   it('seeds a forked child but reads only the child-owned output', async () => {
     const { ctx, parent } = await setup([textResponse('parent answer'), textResponse('child answer')])
-    parent.send([{ type: 'text', text: 'parent question' }])
+    parent.followup([{ type: 'text', text: 'parent question' }])
     await parent.whenIdle()
     const seed = parent.session.events.slice()
     const run = await startInProcessRun(request(parent), { seed })