Several examples assign Agent.create() without awaiting it

Description

Agent.create() is typed and implemented as Promise<SDKAgent>. Two cookbook embedders treat the return value as an agent handle and call .send() / .close() / Symbol.asyncDispose on the promise.

Coding Agent CLI

CodingAgentSession stores the create promise on this.agent: SDKAgent and never awaits it in the constructor or replaceAgent():

https://github.com/cursor/cookbook/blob/main/sdk/coding-agent-cli/src/agent.ts#L80-L88

constructor(options: CodingAgentSessionOptions) {
  this.apiKey = options.apiKey
  this.cwd = options.cwd
  this.force = options.force
  this.mode = options.executionMode ?? "local"
  this.modelSelection = options.model
  this.agent = this.createAgent()
  this.agentKey = this.currentAgentKey()
}

https://github.com/cursor/cookbook/blob/main/sdk/coding-agent-cli/src/agent.ts#L230-L235

private async replaceAgent() {
  const previousAgent = this.agent
  this.agent = this.createAgent()
  this.agentKey = this.currentAgentKey()
  await previousAgent[Symbol.asyncDispose]()
}

sendPrompt() then does await this.agent.send(...). If this.agent is still a Promise, that is Promise.send, which is not a function.

App Builder project-name helper

The session path already awaits correctly (session.agent = await Agent.create(...)). The project-name path does not:

https://github.com/cursor/cookbook/blob/main/sdk/app-builder/src/lib/app-builder/server.ts#L337-L353

const agent = Agent.create({
  apiKey,
  model: { id: process.env.CURSOR_PROJECT_NAME_MODEL ?? "composer-2" },
})

try {
  const run = await agent.send(buildProjectNamePrompt(context))
  // ...
} finally {
  agent.close()
}

Expected

Every Agent.create() / Agent.resume() call is awaited before the handle is used, matching the quickstart and getOrCreateAgent().

Suggested fix

• CLI: make createAgent() async, await it in the constructor (or defer create until first sendPrompt), and await the new agent in replaceAgent() before disposing the old one.
• App Builder: const agent = await Agent.create(...) in promptProjectNameWithXml.

Start with sdk/coding-agent-cli/src/agent.ts, especially the constructor, createAgent(), replaceAgent(), and sendPrompt(), then inspect sdk/app-builder/src/lib/app-builder/server.ts around promptProjectNameWithXml. Compare these paths with the quickstart and getOrCreateAgent() usage. Done means every Agent.create() or Agent.resume() handle is awaited before send, close, or disposal, including agent replacement.