Add evidence-first Bug Reproduction Brief skill 🤖🤖🤖

docs/README.skills.md

@@ -89,6 +89,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-skills) for guidelines on how to
 | [breakdown-feature-prd](../skills/breakdown-feature-prd/SKILL.md)<br />`gh skills install github/awesome-copilot breakdown-feature-prd` | Prompt for creating Product Requirements Documents (PRDs) for new features, based on an Epic. | None |
 | [breakdown-plan](../skills/breakdown-plan/SKILL.md)<br />`gh skills install github/awesome-copilot breakdown-plan` | Issue Planning and Automation prompt that generates comprehensive project plans with Epic > Feature > Story/Enabler > Test hierarchy, dependencies, priorities, and automated tracking. | None |
 | [breakdown-test](../skills/breakdown-test/SKILL.md)<br />`gh skills install github/awesome-copilot breakdown-test` | Test Planning and Quality Assurance prompt that generates comprehensive test strategies, task breakdowns, and quality validation plans for GitHub projects. | None |
+| [bug-reproduction-brief](../skills/bug-reproduction-brief/SKILL.md)<br />`gh skills install github/awesome-copilot bug-reproduction-brief` | Turn a vague, intermittent, or environment-specific bug report into a minimal evidence-backed reproduction before proposing a fix. | None |
 | [centos-linux-triage](../skills/centos-linux-triage/SKILL.md)<br />`gh skills install github/awesome-copilot centos-linux-triage` | Triage and resolve CentOS issues using RHEL-compatible tooling, SELinux-aware practices, and firewalld. | None |
 | [chrome-devtools](../skills/chrome-devtools/SKILL.md)<br />`gh skills install github/awesome-copilot chrome-devtools` | Expert-level browser automation, debugging, and performance analysis using Chrome DevTools MCP. Use for interacting with web pages, capturing screenshots, analyzing network traffic, and profiling performance. | None |
 | [cli-mastery](../skills/cli-mastery/SKILL.md)<br />`gh skills install github/awesome-copilot cli-mastery` | Interactive training for the GitHub Copilot CLI. Guided lessons, quizzes, scenario challenges, and a full reference covering slash commands, shortcuts, modes, agents, skills, MCP, and configuration. Say "cliexpert" to start. | `references/final-exam.md`<br />`references/module-1-slash-commands.md`<br />`references/module-2-keyboard-shortcuts.md`<br />`references/module-3-modes.md`<br />`references/module-4-agents.md`<br />`references/module-5-skills.md`<br />`references/module-6-mcp.md`<br />`references/module-7-advanced.md`<br />`references/module-8-configuration.md`<br />`references/scenarios.md` |

skills/bug-reproduction-brief/SKILL.md

@@ -0,0 +1,85 @@
+---
+name: bug-reproduction-brief
+description: 'Turn a vague, intermittent, or environment-specific bug report into a minimal evidence-backed reproduction before proposing a fix.'
+---
+
+# Bug Reproduction Brief
+
+Use this skill when a bug report is incomplete, intermittent, environment-specific, or mixed with an assumed cause. The goal is to prove the smallest observable failure before diagnosis or repair begins.
+
+## 1. Record the observed failure
+
+Capture the exact error, incorrect output, timestamp, affected route or command, and the smallest known input. Preserve relevant logs without secrets or personal data. Label second-hand descriptions as unverified.
+
+## 2. Identify the environment
+
+Record only facts you can inspect:
+
+- repository and commit;
+- runtime and package-manager versions;
+- operating system or container;
+- dependency lockfile;
+- relevant feature flags;
+- whether the target is local, test, staging, or production.
+
+Never guess credentials or production configuration.
+
+## 3. Separate expected from actual behaviour
+
+Write two explicit observable statements:
+
+```text
+Expected: [observable result]
+Actual:   [observable result, including status or error]
+```
+
+Do not put the suspected cause in either statement.
+
+## 4. Reduce the reproduction
+
+Start from the reported path, then remove unrelated data, services, and steps one at a time. Keep the smallest fixture that still fails. If the failure stops, restore the last removed condition and record it.
+
+Prefer an isolated test, minimal script, or smallest safe request over reproducing against production.
+
+## 5. Prove repeatability
+
+Run the minimal reproduction at least twice where safe. Record commands and outputs. If the failure is intermittent, report the observed frequency and duration instead of calling it deterministic.
+
+## 6. Stop before repair
+
+A verified reproduction is the deliverable. Do not edit implementation code while building the brief because that can destroy the evidence or mix diagnosis with remediation.
+
+## Output
+
+```markdown
+# Bug Reproduction Brief
+
+- Target and commit:
+- Environment:
+- Expected:
+- Actual:
+- Minimal steps:
+- Minimal fixture:
+- Reproduced: yes / no / intermittent
+- Evidence:
+- Unknowns:
+- Safe next hypothesis to test:
+```
+
+## Safety boundaries
+
+- Do not change production data merely to reproduce a bug.
+- Do not publish secrets, customer records, or private source.
+- Do not claim a root cause from correlation alone.
+- Use read-only or reversible discovery first.
+- Stop after a verified reproduction; diagnosis and repair are separate workflows.
+
+## Example prompt
+
+```text
+Use the Bug Reproduction Brief skill on the failing checkout test. Do not fix it yet. Reduce it to the smallest safe failing fixture and report the exact command evidence, expected result, actual result, and remaining unknowns.
+```
+
+## Source and licence
+
+Adapted from the MIT-licensed workflow at https://github.com/skyestrela/ai-agent-skill-preview.