Typing: input accepts role: assistant + type: input_text in content but the combination does not work

[leonardomalzacher]

Bug

The Type for AgentInputItem and AgentOutputItem seem to contain an issue:

const agent = new Agent({
  name: "Test Agent",
});

const runner = new Runner();

const result = await runner.run(agent, [
  {
    role: "assistant",
    content: [{ type: "input_text", text: "Hello, world!" }],
    status: "completed"
  },
]);

console.log(result);

Results in:

UserError: Unsupported output content type: {"type":"input_text","text":"Hello, world!"}
    at getOutputMessageContent (/Users/malzacher/Documents/dev/playground/node_modules/@openai/agents-openai/src/openaiResponsesModel.ts:303:9)
    at Array.map (<anonymous>)
    at getMessageItem (/Users/malzacher/Documents/dev/playground/node_modules/@openai/agents-openai/src/openaiResponsesModel.ts:346:29)
    at <anonymous> (/Users/malzacher/Documents/dev/playground/node_modules/@openai/agents-openai/src/openaiResponsesModel.ts:408:14)
    at Array.map (<anonymous>)
    at getInputItems (/Users/malzacher/Documents/dev/playground/node_modules/@openai/agents-openai/src/openaiResponsesModel.ts:406:16)
    at OpenAIResponsesModel.#fetchResponse (/Users/malzacher/Documents/dev/playground/node_modules/@openai/agents-openai/src/openaiResponsesModel.ts:802:19)
    at <anonymous> (/Users/malzacher/Documents/dev/playground/node_modules/@openai/agents-openai/src/openaiResponsesModel.ts:866:49)
    at <anonymous> (/Users/malzacher/Documents/dev/playground/node_modules/@openai/agents-core/src/tracing/createSpans.ts:41:22)
    at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14) {
  state: undefined
}

I guess input_text is not intended for role: assistant but allowed by the typing. Just a minor bug tho.

Debug information

• Agents SDK version: (e.g. v0.10)
• Runtime environment (e.g. Node.js 22.14.0)

[seratch]

Hi @leonardomalzacher, thanks for sharing this! Indeed, an assistant's input_text is not allowed, so a bit stricter typing would be even more helpful. We may consider some enhancement around this.

For other visitors, when having role: assistant, basically output items are expected:

import { Agent, Runner } from '@openai/agents';

const agent = new Agent({
  name: "Test Agent",
});

const runner = new Runner();

async function main() {
  const result = await runner.run(agent, [
    {
      role: "user",
      content: [{ type: "input_text", text: "Hello, world!" }],
    },
    {
      role: "assistant",
      content: [{ type: "output_text", text: "Hey how are you?" }],
      status: "completed"
    },
    {
      role: "user",
      content: [{ type: "input_text", text: "Can you tell me a different way of saying what you just said?" }],
    },
  ]);
    console.log(result.finalOutput);
}

main();