Gemini models require OpenRouter reasoning details to be preserved in each request.

[zayr0-9]

I am sending the following payload to the chat.send() function, but in gemini 3 models I end up getting 400 error where it has some issue with how the reasoning details are being included. Does anyone have any idea on how my inclusion of reasoningDetails incorrect?
I am on openrouter/sdk: 0.3.10

Full messages payload:

  {
    "role": "system",
    "content": "test"
  },
  {
    "role": "user",
    "content": "search online for new bleach news"
  },
  {
    "role": "assistant",
    "content": null,
    "toolCalls": [
      {
        "id": "tool_brave_search_U2ZJEE46KT9PuS0ZAsbt",
        "type": "function",
        "function": {
          "name": "brave_search",
          "arguments": "{\"offset\":0,\"extra_snippets\":true,\"search_lang\":\"en\",\"country\":\"us\",\"count\":10,\"summary\":true,\"query\":\"latest bleach anime manga news May 2024 Thousand-Year Blood War Part 3 release date\",\"safesearch\":\"moderate\"}"
        }
      }
    ],
    "reasoningDetails": [
      {
        "type": "reasoning.encrypted",
        "data": "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",
        "id": "tool_brave_search_U2ZJEE46KT9PuS0ZAsbt",
        "format": "google-gemini-v1",
        "index": 0
      }
    ]
  },
  {
    "role": "tool",
    "content": "{\"success\":true,\"results\":[{\"title\":\"Bleach: Thousand-Year Blood War Part 3 Release Window: Everything We Know About the Anime's Return\",\"url\":\"https://screenrant.com/bleach-thousand-year-blood-war-part-3-announced-release/\",\"description\":\"While this one didn&#x27;t feature much in the way of new information, it did allay any fears that the international debut would be delayed by emphasizing the <strong>October 5, 2024</strong>, release date.\",\"age\":\"September 25, 2024\",\"language\":\"en\"},{\"title\":\"Bleach: Thousand-Year Blood War part 3 release date, story recap, trailer, and everything we know about The Conflict | GamesRadar+\",\"url\":\"https://www.gamesradar.com/entertainment/anime-shows/bleach-thousand-year-blood-war-part-3-release-date-trailer-cast-story-the-conflict/\",\"description\":\"For more from the wide world of anime, check out our guides to Jujutsu Kaisen season 3, Demon Slayer Infinity Castle, and One-Punch Man season 3. ... Bleach: Thousand-Year Blood War part 3 premiered on <strong>October 5, 2024</strong>.\",\"age\":\"October 16, 2024\",\"language\":\"en\"},{\"title\":\"Bleach: Thousand-Year Blood War Part 3 release date, cast, plot and everything you need to know\",\"url\":\"https://www.digitalspy.com/tv/a45335209/bleach-thousand-year-blood-war-part-3/\",\"description\":\"Bleach: Thousand-Year Blood War ended its second cour in <strong>September 2023</strong> - here&#x27;s what we know about part 3&#x27;s release date, plot and manga spoilers.\",\"age\":\"July 8, 2024\",\"language\":\"en\"},{\"title\":\"Bleach: Thousand-Year Blood War Part 3 - The Conflict's Promo Video Reveals 2024 Release - News - Anime News Network\",\"url\":\"https://www.animenewsnetwork.com/news/2023-09-30/bleach-thousand-year-blood-war-part-3-the-conflict-promo-video-reveals-2024-release/.203015\",\"description\":\"Part 2 of anime aired in July // Viz Media unveiled a promotional video, a new key visual, and the 2024 release date for Bleach: Thousand-Year Blood War Part...\",\"language\":\"en\"},{\"title\":\"Bleach: Thousand-Year Blood War - Wikipedia\",\"url\":\"https://en.wikipedia.org/wiki/Bleach:_Thousand-Year_Blood_War\",\"description\":\"The second cours, subtitled The ... The Conflict (相剋譚, Sōkoku-tan), consisting of 14 episodes, aired from <strong>October to December 2024</strong>....\",\"age\":\"1 week ago\",\"language\":\"en\"},{\"title\":\"Bleach: Thousand Year Blood War season 3 release schedule | When are new episodes out? | Radio Times\",\"url\":\"https://www.radiotimes.com/tv/fantasy/anime/bleach-thousand-year-blood-war-season-3-release-schedule/\",\"description\":\"Bleach: Thousand Year Blood War Part 3 episode 4 - The Betrayer - <strong>Saturday 26th October 2024</strong>\",\"age\":\"November 15, 2024\",\"language\":\"en\"},{\"title\":\"Bleach: Thousand-Year Blood War Part 3 - The Conflict Reveals New Promo Video; Bleach Manga Gets New Rock Musical Adaptation in 2024 - News - Anime News Network\",\"url\":\"https://www.animenewsnetwork.com/news/2023-12-16/bleach-thousand-year-blood-war-part-3-the-conflict-reveals-new-promo-video-bleach-manga-gets-new-/.205597\",\"description\":\"The event also announced a new ... years after its last rock musical adaptation. ... <strong>The Bleach: Thousand-Ye
provider error ChatError: Provider returned error
    at Object.transform (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/server/node_modules/@openrouter/sdk/esm/models/errors/chaterror.js:26:12)
    at Object.inst._zod.parse (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/node_modules/zod/v4/classic/schemas.js:760:28)
    at handlePipeResult (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/node_modules/zod/v4/core/schemas.js:1601:25)
    at Object.inst._zod.parse (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/node_modules/zod/v4/core/schemas.js:1594:16)
    at Module.<anonymous> (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/node_modules/zod/v4/core/parse.js:6:32)
    at _.inst.parse (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/node_modules/zod/v4/classic/schemas.js:29:42)
    at safeParseResponse.request.request (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/server/node_modules/@openrouter/sdk/esm/lib/matchers.js:168:74)
    at safeParseResponse (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/server/node_modules/@openrouter/sdk/esm/lib/matchers.js:193:19)
    at matchFunc (file:///home/karn/webbdrasil/Webdrasil/ygg-chat/server/node_modules/@openrouter/sdk/esm/lib/matchers.js:168:28)
    at processTicksAndRejections (node:internal/process/task_queues:105:5) {
  statusCode: 400,
  body: '{"error":{"message":"Provider returned error","code":400,"metadata":{"raw":"Gemini models require OpenRouter reasoning details to be preserved in each request. Please refer to our docs: https://openrouter.ai/docs/guides/best-practices/reasoning-tokens#preserving-reasoning-blocks. Upstream error: {\\n  \\"error\\": {\\n    \\"code\\": 400,\\n    \\"message\\": \\"Function call is missing a thought_signature in functionCall parts. This is required for tools to work correctly, and missing thought_signature may lead to degraded model performance. Additional data, function call `default_api:brave_search` , position 2. Please refer to https://ai.google.dev/gemini-api/docs/thought-signatures for more details.\\",\\n    \\"status\\": \\"INVALID_ARGUMENT\\"\\n  }\\n}\\n","provider_name":"Google AI Studio"}},"user_id":"org_361BMylN1K3ZlyQ4cA7DbzQP0yg"}',```

[dtbndr]

i tool get a 400 error as well. i'm using karthik/gptel package and i use openrouter to make my requests.