Performance-first Zig guidance for systems code. Use for Zig speed, allocation, benchmark, batch API, module-readiness, hot-loop, compiler-output, and machine-level performance work. Read the machine-level and benchmarking references first, use compiler/allocation references when the evidence gap needs them, and match the response to the user's request: design discussion, implementation, review, or evidence report.
Use for PR review remediation or versioned work package creation/execution. Each workflow has a step-by-step procedure; read it and follow it exactly.
Performance-grounded code implementation, bug fixes, refactors, code reviews, and technical guidance. Covers hard cutovers, instrumentation, data layout, simple state objects, structured comments, and anti-pattern detection.
Operate Railway infrastructure: create projects, provision services and databases, deploy code, configure environments and variables, manage domains, troubleshoot failures, check status and metrics, and query Railway docs. Use this skill whenever the user mentions Railway, deployments, services, environments, build failures, or infrastructure operations, even if they don't say "Railway" explicitly.
Organize and modernize AGENTS.md and CLAUDE.md context systems. Use when the user works on structuring, migrating, or curating agent instruction files and repo context architecture.