PostgreSQL best practices — schema design, query performance, indexing, connection management, RLS, concurrency, monitoring, and migrations. Load when writing SQL, designing schemas, or optimizing PostgreSQL queries.
Shared protocols for all agents in the multi-agent pipeline: recursive nesting, pre-implementation restatement, parallel dispatch format, and agent definition cascade. Load this skill instead of inlining these protocols in every agent file.
MECE task decomposition, file ownership enforcement, DAG-based execution, and safe merge protocol for intra-domain parallel dispatch. The safety invariants that prevent merge chaos when multiple agents write in parallel. Applies recursively at every nesting depth.
Structured code review protocol for inspecting code quality against the full rule set. Use when auditing code written by yourself or another agent, during the /audit workflow, or when the user asks for a code review.
Pre-flight checklist and post-implementation self-review protocol. Use before generating any code (pre-flight) and after writing code but before verification (self-review) to catch issues early.
Profile-driven performance optimization protocol. Use when profiling data (CPU, heap, trace) is available or when the user requests performance analysis. Covers methodology (Profile → Analyze → Opportunity Scan → Prioritize → Optimize → Benchmark), optimization pattern catalog, safety invariants, and when-to-stop heuristics. Language-specific tooling is in languages/*.md.
Mobile E2E testing patterns — Flutter integration_test, Patrol, Maestro, golden testing, device matrix, and test data management. Use when writing E2E tests for mobile applications.
Python type hints, Protocols, Pydantic, async/await, pytest, ruff, mypy strict.