Unit Testing

Systematic bug fixing workflow with regression tests and PR creation. Use when the user asks to "fix a bug", "debug an issue", "resolve a problem", or provides error messages/failing tests to fix. Handles reproduction, root cause analysis, test creation, fix implementation, and PR submission.

Creates comprehensive implementation plans with bite-sized tasks before touching code. USE WHEN user wants detailed implementation plan OR has spec/requirements for multi-step task OR needs to break down complex feature OR before starting significant coding work. Documents file paths, code examples, testing, and verification steps assuming engineer has minimal codebase context.

Python development best practices and modern tooling with uv. USE WHEN writing Python code, managing dependencies, testing, type checking, or working with Python projects.

Evidence-based debugging methodology emphasizing observation over assumptions following the scientific method. USE WHEN user reports a bug OR system behavior is unexpected OR troubleshooting issues OR investigating errors OR debugging failures. Follows observe, hypothesize, test, verify cycle with disciplined evidence gathering.

Create and maintain GitHub Actions workflows for CI/CD, testing, deployment, and automation. Use when setting up pipelines, automating tasks, or configuring continuous integration.

Test suite audit coordinator (L2). Delegates to 5 workers (Business Logic, E2E, Value, Coverage, Isolation). Aggregates results, creates Linear task in Epic 0.

This skill provides guidance for cracking 7z archive password hashes. It should be used when tasked with recovering passwords from 7z encrypted archives, extracting and cracking 7z hashes, or working with password-protected 7z files in CTF challenges, security testing, or authorized recovery scenarios.

Guide for implementing metacircular evaluators—interpreters that can interpret themselves. This skill should be used when building self-interpreting Scheme-like evaluators, debugging multi-level interpretation issues, or implementing language features like environments, closures, and special forms. Focuses on incremental development, continuous metacircular testing, and systematic debugging of nested interpretation failures.

Plans Story test task by Risk-Based Testing after manual testing. Calculates priorities, selects E2E/Integration/Unit, delegates to ln-311-task-creator. Invoked by ln-340-story-quality-gate.

Upgrade dependencies safely using pnpm catalog, checking for breaking changes, and testing upgrades. Use when updating packages, applying security patches, or upgrading major versions.

E2E Critical Coverage audit worker (L3). Validates E2E coverage for critical paths (Money 20+, Security 20+, Data 15+). Pure risk-based - no pyramid percentages.

Build edge-first TypeScript applications on Cloudflare Workers. Covers Workers API, Hono framework, KV/D1/R2 storage, Durable Objects, Queues, and testing patterns. Use when creating serverless workers, edge functions, or Cloudflare-deployed services.

This skill provides guidance for tasks involving merging git branches that contain different implementations of ARC-AGI pattern recognition algorithms, and then implementing a working solution that generalizes across examples. Use this skill when the task involves (1) merging git branches with conflicting code, (2) analyzing ARC-AGI style input/output grid transformations, or (3) implementing pattern recognition algorithms that must generalize to unseen test cases.

Enforce TDD when fixing bugs - write a failing test first, then make it pass. Use when about to fix a bug, correct broken behavior, or resolve an issue in production code. Activates for phrases like "let me fix", "I'll fix this", "same issue as", "the problem is", or when editing code after identifying a bug.

Use when building Avo admin interfaces. Creates resources, actions, filters, and dashboards following Avo conventions. Fetches latest docs dynamically.

Browser automation using browser-cdp CLI. Control Chrome, Brave, or Edge browsers for testing, scraping, and web interaction. Uses your real browser (not test mode) for authentic sessions.

Build health audit worker (L3). Checks compiler/linter errors, deprecation warnings, type errors, failed tests, build configuration issues. Returns findings with severity (Critical/High/Medium/Low), location, effort, and recommendations.

This skill provides guidance for XSS filter bypass tasks where the goal is to craft HTML payloads that execute JavaScript despite sanitization filters. Use this skill when tasks involve bypassing HTML sanitizers (like BeautifulSoup), exploiting parser differentials between server-side sanitizers and browsers, or security testing/CTF challenges involving XSS filter evasion.

Use when encountering a bug - complete workflow from discovery through debugging, bd issue, test-driven fix, verification, and closure

Use when implementation complete and tests pass - closes bd epic, presents integration options (merge/PR/keep/discard), executes choice