Improve jit-regression-test skill with structured description and stop signals#124734
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lewing merged 1 commit intodotnet:mainfrom Feb 23, 2026
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Pull request overview
This PR improves the jit-regression-test skill documentation with better structured descriptions, explicit stop signals, and consolidated tips to enhance skill activation accuracy and prevent misapplication.
Changes:
- Added USE FOR / DO NOT USE FOR routing keywords to the skill description for better activation matching
- Added blockquote stop signal (line 15) specifying when NOT to create tests (no repro, duplicate, non-JIT bugs)
- Consolidated tips from 4 verbose items to 2 concise items, removing duplicates of conventions already covered
EgorBo
approved these changes
Feb 23, 2026
AaronRobinsonMSFT
approved these changes
Feb 23, 2026
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Summary
Improve the jit-regression-test skill with structured description, stop signals, and consolidated tips.
Changes
Structured description — Added USE FOR / DO NOT USE FOR routing keywords for better skill activation. Trigger phrases include: creating JIT regression tests, extracting repro code, "write a test for this JIT bug", "create a regression test for issue #NNNNN". Anti-triggers: non-JIT tests, debugging without repro, performance benchmarks.
Stop signal blockquote — Added explicit guidance on when NOT to create a test (no reproducible code, duplicate of existing test, bug is in libraries not JIT). This prevents the skill from being misapplied on invalid inputs.
Consolidated tips — Reduced from 4 verbose items to 2 concise items. Removed tips that duplicate the conventions section (NoInlining, minimize repro).
Validation
Multi-model eval results (5 questions testing trigger routing, stop compliance, structural output, convention compliance, negative routing):
Key improvement: Haiku stop-signal compliance went from 2/5 to 5/5. The blockquote pattern causes weaker models to correctly refuse when stop conditions are met, rather than inferring from general knowledge.
Context
These patterns (structured descriptions, blockquote stop signals) are documented in the Copilot Skills Guidance and have been validated across multiple skills (ci-analysis, flow-analysis, flow-tracing).