feat: create ToolGuidelines for better Agent orientation of when and how to use marimo tools, add guidelines to GetMarimoRules tool

[bjoaquinc]

📝 Summary

This improves tool guidance for agents by adding structured guidelines that inform the agents not just what the tool is but when to and not to use it ++:

this also improves the Agent consistently using the GetMarimoRules tool:

🔍 Description of Changes

• Add ToolGuidelines to types.py
• Integrate ToolGuidelines into base.py
• Update GetMarimoRules class to improve usage

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Oct 15, 2025 2:33pm

[Light2Dark]

we are going to release soon, so okay to do this later. But I think a snapshot test of how this looks like would be nice.