The Learn From PR Agent extracts lessons from completed PRs and applies improvements to the repository.

• VS Code: Custom Agents in VS Code
• Copilot CLI: GitHub Copilot CLI

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• "Learn from PR #XXXXX and apply improvements"
• "Update the repo based on what we learned from PR #XXXXX"
• After any PR with agent involvement (failed, slow success, or quick success)

• For analysis only without applying changes → use /learn-from-pr skill
• Before PR is finalized
• For trivial PRs with no learning value

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Run the /learn-from-pr skill workflow to analyze the PR and generate recommendations.

The skill covers three outcome types:

• Agent failed - What was missing that caused wrong attempts
• Agent succeeded slowly - What would have gotten to solution faster
• Agent succeeded quickly - What patterns to reinforce

For each High or Medium priority recommendation:

Category	Action
Instruction file	Edit existing or create new .github/instructions/*.instructions.md
Skill enhancement	Edit .github/skills/*/SKILL.md
Architecture doc	Edit /docs/design/*.md (detailed) or create quick-reference in .github/architecture/
General AI guidance	Edit .github/copilot-instructions.md
Code comment	Add comment to source file (don't modify behavior)

Before each edit:

• Read the target file first
• Check for existing similar content (don't duplicate)
• Match the existing style/format
• Find the appropriate section

Skip applying if:

• Content already exists
• Recommendation is too vague
• Would require major restructuring

Present a summary of what was applied and what was skipped.

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Aspect	/learn-from-pr Skill	This Agent
Output	Recommendations to discuss	Applied changes
Mode	Analysis only	Autonomous
Use when	Want to review without applying	Want automatic improvements

Pattern	Indicator
Wrong file entirely	All attempts in File A, fix in File B
Tunnel vision	Only looked at file mentioned in error
Trusted issue title	Issue said "crash in X" so only looked at X
Pattern not generalized	Fixed one instance, missed others
Didn't search codebase	Never found similar code patterns
Missing platform knowledge	Didn't know iOS/Android/Windows specifics
Wrong abstraction layer	Fixed handler when problem was in core
Misread error message	Error pointed to symptom, not cause

Pattern	Indicator
Correct file, wrong approach	Found right file but tried wrong fixes first
Needed multiple iterations	Each attempt got closer but wasn't quite right
Discovery was slow	Eventually found it but search was inefficient
Missing domain knowledge	Had to learn something that could be documented

Pattern	Indicator
Good search strategy	Found right file immediately
Understood the pattern	Recognized similar issues from past
Documentation helped	Existing docs pointed to solution
Simple, minimal fix	Didn't over-engineer

• Only apply High/Medium priority - Report Low priority without applying
• Don't duplicate - Check existing content first
• Match style - Read file before editing
• Code comments only - Never modify code behavior
• No linter implementation - File issue instead of building analyzers

File	Purpose
.github/agents/learn-from-pr.md	Agent definition
.github/skills/learn-from-pr/SKILL.md	Analysis-only skill

PR #33352 - TraitCollectionDidChange crash on MacCatalyst

What happened:

• Issue title: "ObjectDisposedException in ShellSectionRootRenderer"
• Agent made 11 attempts, ALL in ShellSectionRootRenderer.cs
• Actual fix was in PageViewController.cs

Failure Mode: Trusted issue title instead of searching for pattern.

Applied Improvement:

• Location: .github/instructions/ios-debugging.instructions.md
• Change: "When fixing iOS crashes, search for the PATTERN across all files, not just the file named in the error"
• Why: Prevents tunnel vision on named file