Tool Call Validation Fix Summary

Issue

The error message "tool call validation failed: parameters for tool installPackage did not match schema" was occurring when the AI tried to install packages.

Root Cause

The Groq models (including moonshotai/kimi-k2-instruct) do not support function/tool calling. This is a limitation of most Groq models - only specific models like llama3-groq-70b-8192-tool-use-preview support tools.

Solution

Instead of using the Vercel AI SDK's tool calling feature, we switched to XML-based package detection:

1. Removed Tool Support

Removed the tool import and installPackage tool definition
Removed the tools configuration from the streamText call

2. Updated System Prompt

Changed from:

Use the installPackage tool with parameters: {name: "package-name", reason: "why you need it"}

To:

You MUST specify packages using <package> tags BEFORE using them in your code. 
For example: <package>three</package> or <package>@heroicons/react</package>

3. Implemented XML Tag Detection

Added streaming detection for <package> tags during response generation
Implemented buffering to handle tags split across chunks
Added support for both individual <package> tags and grouped <packages> tags

4. Real-time Package Detection

Packages are now detected in real-time as the AI generates the response:

// Buffer incomplete tags across chunks
const searchText = tagBuffer + text;
const packageRegex = /<package>([^<]+)<\/package>/g;

while ((packageMatch = packageRegex.exec(searchText)) !== null) {
  const packageName = packageMatch[1].trim();
  if (packageName && !packagesToInstall.includes(packageName)) {
    packagesToInstall.push(packageName);
    await sendProgress({ 
      type: 'package', 
      name: packageName,
      message: `📦 Package detected: ${packageName}`
    });
  }
}

Results

✅ Package detection now works reliably
✅ Real-time UI feedback shows packages as they're detected
✅ No more tool validation errors
✅ Compatible with all Groq models

UI Feedback

Users now see:

📦 Package detected: three
📦 Package detected: @react-three/fiber
📦 Package detected: @react-three/drei

As packages are detected in the AI's response, providing immediate feedback about dependencies that will be installed.

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