A lot of unnecessary Mermaid diagrams from Architect

[dsent]

App Version

3.21.2

API Provider

Google Gemini

Model Used

Gemini 2.5 Pro

🔁 Steps to Reproduce

1. Give any trivial task to Architect

💥 Outcome Summary

In 99% of the cases, it will try to generate a Mermaid diagram even for something as simple as a list of three steps. Moreover, this diagram will often contain errors and won't render (see #2897 #4867).

The default Architect instructions say: "Include Mermaid diagrams if they help make your plan clearer." Well, most models don't react well to this instruction. They seem to think that a diagram always makes a plan clearer. It wastes tokens and pollutes the context with totally unnecessary diagrams.

I've changed the wording in this way:
If the logic is really complicated, parallel or circular, include Mermaid diagrams to make the intent clearer. Do not include diagrams for a list of sequential steps.

This greatly improves the results for me. Maybe the default wording should be changed a bit along these lines?

📄 Relevant Logs or Errors (Optional)

[SannidhyaSah]

Mermaid Diagrams are essential not only for humans, but also the LLM. The more they are, the better is it for the LLM to follow the plan, and they hardly take any tokens. Furthermore, if you do want to make any changes to your Architect, you can already change it from the modes. Changing the whole system prompt for this seems a step too far-fetched.