Bug: GenerateImage tool returns relative path causing LLM to hallucinate incorrect domain in async image URL

[xinpehr]

Description:

When an image is generated asynchronously (e.g. via fal.ai), the GenerateImage tool returns a relative path (/app/imagine/{id}) instead of a full absolute URL. This causes the LLM to hallucinate a domain name from its training data and construct an incorrect URL in its response to the user.

Steps to Reproduce:

1. Enable the generate_image tool in an assistant.
2. Use an async image generation model (e.g. fal.ai).
3. Ask the assistant to generate an image.
4. Observe the URL in the assistant's response — the domain is wrong.

Root Cause:

In src/Ai/Infrastructure/Services/Tools/GenerateImage.php, the call() method returns:

'The image is being generated asynchronously. You can view it at: /app/imagine/'
    . $image->getId()->getValue()->toString()
    . '. The image will be ready in a few seconds.'

The relative path is passed as a tool result to the LLM. Since the LLM has no knowledge of the actual deployment domain, it constructs a full URL using a hallucinated domain from its training data.

Expected Behavior:

The tool should return a full absolute URL using the configured site domain and protocol, e.g.:

https://yourdomain.com/app/imagine/{id}

Suggested Fix:

Inject option.site.domain and option.site.is_secure into the GenerateImage class (same pattern already used in src/Ai/Infrastructure/Services/FalAi/Helper.php) and build the full URL before returning it.

Environment:

• Affects all deployments using async image generation models
• Severity: Medium — users receive a broken or misleading link in chat