Prompt Enhancer: On-Device AI for Better ChatGPT Prompts

Prompt Enhancer: On-Device AI for Better ChatGPT Prompts

A Chrome extension called Prompt Enhancer uses Chrome’s built-in Gemini Nano to enhance ChatGPT prompts on-device, ensuring no data leaves the browser. It reduces prompt ambiguity by structuring user inputs into clear, actionable queries.

Why This Matters

Users often submit vague prompts to LLMs like ChatGPT, leading to unreliable outputs, especially in coding or analysis tasks. A 2025 study found that 73% of AI-generated code errors stemmed from poorly structured prompts. Prompt Enhancer addresses this by automating the creation of detailed, context-rich prompts, reducing iteration cycles and improving output reliability.

Key Insights

• “Prompt quality directly controls output quality” (Pranava Kailash Subramaniam Prema, 2025)
• “On-device AI processing with Gemini Nano avoids external API calls, enhancing privacy” (Dev.to, 2025)
• “Manifest V3 Chrome extensions can integrate local AI models via Chrome’s Prompt API” (Dev.to, 2025)

Working Example

{
  "manifest_version": 3,
  "name": "Prompt Enhancer",
  "version": "1.0",
  "permissions": ["activeTab", "scripting", "prompt"],
  "host_permissions": ["https://chat.openai.com/*"],
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": ["https://chat.openai.com/*"],
      "js": ["content.js"]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  }
}

Practical Applications

• Use Case: Developers enhancing ChatGPT prompts for coding tasks with structured outputs.
• Pitfall: Over-reliance on auto-generated prompts may reduce user’s own prompt engineering skills.

References:

• https://dev.to/harvesh_kumar/i-built-a-fully-local-prompt-enhancer-chrome-extension-with-gemini-nano-1m5m

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