holocron

Rubric for keeping Claude Code sessions cheap without losing quality — model tiering, cache hygiene, Read discipline, MCP pruning, subagent isolation. Use when cost feels wrong, before setting a budget, or when onboarding a teammate.

Safe schema-migration patterns for systems under live traffic — expand/contract, backfill, double-write, shadow-read, online DDL. Use when authoring, reviewing, or sequencing a migration that can't take a maintenance window.

What good observability looks like — structured logs, trace spans, metrics, correlation ids, and the instrumentation rules that turn logs into answers. Use when adding a feature, reviewing a service, or debugging a prod issue.

WCAG 2.2 AA quick reference — semantics, keyboard, names, states, contrast, motion, errors. Use when building or reviewing UI components.

REST and GraphQL API design conventions — resource modeling, pagination, error envelopes, versioning, idempotency. Use when adding, changing, or reviewing endpoints.

Apply the Write/Select/Compress/Isolate framework to manage the context window. Use when the task is long, the transcript is bloated, the model is drifting, or before /holocron:handoff.

Hypothesis-driven debugging — reproduce, hypothesize, probe, locate, fix, guard. Use when something is broken and you don't yet know why.

Performance quick reference — Core Web Vitals, bundle size, rendering, DB queries, caching. Use during implementation or review when perf matters.

Staff-level PR review rubric — correctness, contract, clarity, tests, blast radius. Use when reviewing code (yours or others') before merge.

OWASP-style quick reference — authn/authz, injection, secrets, sessions, crypto, dependencies. Use during code review and before committing security-sensitive changes.

Reference for writing tests that actually protect against regressions — deep assertions over spies, table-driven tests, fixture hygiene, AAA structure. Use when writing, reviewing, or refactoring tests.