Tone down PR Body Update Agent to fix inaccuracies with minimal edits only

[Copilot]

The PR Body Update Agent was too aggressive — it would reformat, restructure, and rewrite bodies that were merely imperfect rather than inaccurate, discarding author context and style in the process.

Changes to gh-aw-update-pr-body.md

• Objective — Reframed from "update if significantly out of date" to "fix only inaccuracies with the minimal edit needed; do not rewrite, reformat, or improve beyond correcting the specific inaccuracy"
• Do not update (Step 3) — Added two explicit guardrails:
  • Body could benefit from better formatting/structure but is not inaccurate
  • Body omits optional detail but nothing it says is wrong
• Update instructions (Step 4) — Replaced open-ended rewrite guidance with targeted-edit rules: change only inaccurate sentences/sections, preserve the original structure/formatting/wording of everything else exactly as the author wrote it

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/ruby/setup-ruby/git/ref/tags/v1
  • Triggering command: /usr/bin/gh gh api /repos/ruby/setup-ruby/git/ref/tags/v1 --jq .object.sha .go 0.1-go1.25.0.lin/tmp/go-build1325625224/b224/ ux-amd64/pkg/tool/linux_amd64/compile (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Tone down PR Body Update Agent</issue_title>
<issue_description>It really should be focused on fixing inaccuracies in the PR body not applying beautiful formatting or making unnecessary changes. Perhaps we change the prompt to say the minimal edit that resolves the inaccuracy?</issue_description>

Comments on the Issue (you are @copilot in this section)

Custom agent used: default-agent
The default agent

• Fixes Tone down PR Body Update Agent #254

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