Prompt API Unavailability: Seeking Guidance on Proper Setup

[Nikul Ram]

Hello,

I’m working on integrating the Prompt API in my Chrome Extension. Despite following the documentation and registering the appropriate origin trial tokens, I receive the error:
  "Prompt API is unavailable. Ensure tokens and permissions are correct."
Here is what i did so far:
1) Registered and added the correct trial_tokens in the manifest.json   
2) Included the aiLanguageModelOriginTrial permission in the manifest.
3) Verified my Chrome version is 131+
4) Enabled the required Chrome flags (#optimization-guide-on-device-model).  
5)Checked the API status using chrome.ai.languageModel.capabilities().
So, API remains unavailable, and the available field consistently indicates the model is inaccessible.
Is there any steps I missed any requirements for the environment that prevents the model from being initialized ?

manifest:
{
  "manifest_version": 3,
  "name": "XYZ",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "aiLanguageModelOriginTrial"
  ],
  "background": { "service_worker": "background.js" },
  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["content.js"]
    }
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "trial_tokens": [
    "token_1_summarizer",
    "token_2_prompt",
    "token_3_languageDetector",
    "token_4_translator"

  ]
}

[Thomas Steiner]

Hi Nikul,

Here's an example of how to call the API in an extension. Also note that as per the API status page, the language detector API is currently broken in extensions. Hope this helps you unlock yourself.

Cheers,

Tom

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[Nikul Ram]

Hello I did follow but I am a bit confused I am getting same error :
  "Prompt API is unavailable. Verify tokens and permissions in the manifest."  

part of manifest :
{
  "manifest_version": 3,
  "name": "Learning Tools",

  "version": "1.0",
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "aiLanguageModelOriginTrial"
  ],
  "background": { "service_worker": "background.js" },

  "trial_tokens": [
    "VALID_PROMPT_API_TOKEN",
    "VALID_SUMMARIZATION_API_TOKEN",
    "VALID_TRANSLATOR_API_TOKEN"
  ]
}


My  background.js has :

if (!chrome.ai || !chrome.ai.languageModel) {
  console.error("Prompt API is unavailable. Verify tokens and permissions.");
}

I dont know what I am doing wrong.

And thank you for your assistance,
Nikul

[Thomas Steiner]

Did you click my link? It was right there.