# Announcing the CoreStory + GitHub Copilot Agentic Bug Resolution Playbook by [CoreStory](/content/author/corestory/index.html) .png) ## Turning Copilot into a disciplined bug-fixing partner Our CoreStory + GitHub Copilot Agentic Bug Resolution Playbook is for teams that want Copilot to handle real bugs—not just propose patches—with a well-defined, test-first workflow. Instead of ad-hoc chat prompts, you embed a six-phase bug-resolution routine into Copilot via repository-level custom instructions. The result is an agent that can investigate, write failing tests, implement minimal fixes, and validate them—without leaving your editor. ### Why we built this for Copilot Developers already lean on Copilot for “spot fixes,” but when production tickets hit, you need something closer to a process than a suggestion engine. By combining CoreStory’s understanding of intended behavior with Copilot’s editing capabilities, we can standardize how bugs are analyzed and resolved: always consult the spec, always write a failing test, always validate against both code and CoreStory before committing. ### What this playbook helps you do Using this playbook, Copilot: - Pulls in issue or bug descriptions and opens a CoreStory investigation thread - Queries CoreStory for invariants, architecture, and design intent - Generates hypotheses and maps symptoms to likely code paths - Writes a failing test that encodes the correct behavior - Applies a minimal fix and re-runs tests to confirm behavior is restored You get faster root-cause analysis, better fix quality, and fewer regressions because each fix is validated against the real specification, not just the current implementation. ### What’s inside The playbook includes: - A six-phase bug-resolution workflow tailored to Copilot’s capabilities - Repository-level instruction templates in .github/copilot-instructions.md - Stepwise prompts for Chat, Inline Chat, and Code Actions - Optional hand-offs to GitHub Issues and CI flows for evidence and enforcement ### Who this is for If your team is already using Copilot but still treats bug fixing as a purely manual process, this playbook is meant to bridge that gap—especially for platforms and QA leaders who want more consistent bug handling across teams. ### How to get started Get the [playbook](/content/playbooks/corestory-github-copilot-agentic-bug-resolution-playbook/index.html), copy the recommended instruction templates into a pilot repo, connect that repo to CoreStory, and route your next few bug tickets through the process. Use regression rate and time-to-root-cause as the key metrics to evaluate impact.