⚠️ Skill descriptions exceed Agent tool's predefined char count budget

[JasonYeMSFT]

Agent tools have a hard char count budget for how many skills it can put in its context. For example, Copilot CLI has a pre-defined 15000 char count budget. If the aggregated char count of all skills exceed this budget, Copilot CLI may truncate any skill at runtime, causing inconsistent behavior.

A PR check is added to count the aggregated char count of all skills in this repo and compares it against Copilot CLI's default budget.

If you are adding a new skill, consider the following:

• Can the content be added as a reference to an existing skill?
• Can an existing skill be rebranded (e.g. change skill name and description) and cover the new content?
• Can the description of the new skill made more concise?

[github-actions]

Thanks for opening this issue, @JasonYeMSFT! 🙏

This has been labeled with skills and too-many-tools since it directly concerns skill descriptions exceeding the Agent tool's character budget, and enhancement because addressing it requires making skill content more concise or restructured. The assign-to-copilot label has also been applied, so a coding agent will look into reducing the aggregated skill description size to stay within the predefined budget.

Generated by Issue Triage for issue #1227