Responses API with `background: true` not returning sources from `web_search` tool

[ng-plentisoft]

Confirm this is a Node library issue and not an underlying OpenAI API issue

• This is an issue with the Node library

Describe the bug

When calling the openai.responses.create using the web_search tool call with the background flag set to true, the response did not contain sources from the web_search object.

Expected:

{
      "id": "ws_xxx",
      "type": "web_search_call",
      "status": "completed",
      "action": {
        "type": "search",
        "query": "the_query",
        "sources": [
          {
            "type": "url",
            "url": "https://wordpress.org/plugins/gopublish-publish-from-google-docs-to-any-site/"
          },
          {
            "type": "url",
            "url": "https://wordpress.com/plugins/muzaara-google-content-api-data-feed"
          },
          {
            "type": "url",
            "url": "https://wordpress.org/plugins/docswrite/"
          },
          {
            "type": "url",
            "url": "https://wordpress.org/plugins/sheetlink/"
          },
          {
            "type": "url",
            "url": "https://wordpress.org/plugins/create-post-by-google-document/"
          },
          {
            "type": "url",
            "url": "https://www.dochub.com/en/integrations/crm-system/try-marketmuses-integration-with-dochub-to-save-time-and-effort"
          }
        ]
      }
    }

Got:

{
      "id": "ws_xxx",
      "type": "web_search_call",
      "status": "completed",
      "action": {
        "type": "search",
        "query": "the_query"
    }

To Reproduce

1. call the openai.responses.create() with web_search tool and background: true configured
2. use the openai.responses.retrieve(responseId, { include: ["web_search_call.action.sources"], }) to get the response

Code snippets

const response = await openai.responses.create({
    model: "gpt-5-mini",
    input: [
      {
        role: "developer",
        content: "",
      },
      {
        role: "user",
        content:
          "Which content optimization APIs plug into popular CMSs, document editors, and site builders for local SEO workflows?",
      },
    ],
    text: {
      format: {
        type: "text",
      },
      verbosity: "low",
    },
    reasoning: {
      effort: "low",
      summary: "auto",
    },
    tools: [
      {
        type: "web_search",
        filters: null,
        search_context_size: "low",
        user_location: {
          type: "approximate",
          city: null,
          country: null,
          region: null,
          timezone: null,
        },
      },
    ],
    store: true,
    background: false,
    include: ["web_search_call.action.sources"],
  });

OS

macOS

Node version

Node v22

Library version

openai v6.2.0

[anisayari]

Same issue here, that's annoying. I only get the query with no sources