Your agent invents things because it has no memory, and can't touch your database because it has no arms. rsc is the meta-harness that gives it both, plus the trade to know the job and the reflexes to not break your repo. For Claude Code, Codex and 15 more.
Skill Claude CodeCodex
Use when building, reviewing, securing, testing or shipping a Django app — models, migrations, QuerySets/managers, FBV/CBV views, forms, the admin, settings split, and Django REST Framework (serializers, ModelViewSet, permissions). NOT async FastAPI/Pydantic services (that is fastapi), NOT Postgres schema/index work…
Skill Claude CodeCodex needs its repo
Use when authoring or auditing a Dockerfile, shrinking a bloated image, hardening a container that runs as root, picking a base image, or wiring a Compose dev loop with hot reload. NOT CI builds or deploy-to-host (that is deployment), NOT k8s autoscaling (that is scaling), NOT app-level injection or secrets-in-code…
Skill Claude CodeCodex
Use when the deliverable is a document's bytes or its literal content — text/tables out of PDFs, AcroForm fill and flatten, page merge/split, PDF/DOCX from templates, OCR of image-only scans. NOT schema-typed fields pulled from text (that is structured-extraction), NOT signature routing (e-signature) or spreadsheet…
Skill Claude CodeCodex
Use when pointing a domain at a host or fixing broken HTTPS — delegating nameservers, writing A/AAAA/CNAME/ALIAS/MX/TXT/CAA rows, apex vs www, standing up auto-renewing TLS, and cutting nameservers over without downtime. NOT inbox placement or warmup (that is email-deliverability), NOT what runs behind the name (that…
Skill Claude CodeCodex
Use when modeling data or querying with Drizzle ORM in TypeScript — pgTable schema in .ts, type-safe select/insert/relational queries, drizzle-kit migrations. NOT Prisma Client or schema.prisma (that is prisma-orm), NOT ORM-agnostic migration strategy (that is db-migrations), NOT Postgres engine tuning or EXPLAIN…
Skill Claude CodeCodex
Use when analytical SQL must run in-process with no server: Parquet/CSV/JSON/Arrow queried in place, OLAP embedded in an app or notebook, a slow pandas groupby on multi-GB data, or S3/lakehouse data read without downloading. NOT a multi-user analytics server (that is clickhouse-analytics), NOT an app's transactional…
Skill Claude CodeCodex
Use when modeling or operating a DynamoDB table: deriving partition/sort keys from access patterns, single-table vs table-per-entity, adding a GSI/LSI, on-demand vs provisioned capacity, or diagnosing hot-partition throttling. NOT relational schema/SQL/EXPLAIN (that is postgresdb), NOT aggregation-pipeline document…
Skill Claude CodeCodex
Use when wiring an e-signature flow with DocuSign or Dropbox Sign — picking the SES/AES/QES legal tier, sending a PDF or template for signature, embedded signing, verifying signing webhooks, retrieving the signed PDF plus audit trail. NOT drafting contract text (that is contracts), NOT extracting fields from PDFs…
Skill Claude CodeCodex
Use when writing or stabilizing Playwright tests that drive a real browser through multi-step journeys — durable locators, web-first assertions, storageState auth, trace/retries, and flakes that only bite in CI. NOT in-process component tests (that is testing-web), NOT WCAG auditing (that is accessibility), NOT the…
Skill Claude CodeCodex
Use when building, hardening, or shipping a cross-platform Electron desktop app — main/renderer/preload process model, typed contextBridge IPC, locking down nodeIntegration/contextIsolation/sandbox/CSP, or packaging with signing and auto-update. NOT a Rust-backed shell on the native webview (that is tauri), nor the…
Skill Claude CodeCodex
Use when a topic must be explained from zero to someone who knows nothing about it: one page, big pictures, very few words, everyday analogies, no jargon and nothing assumed. NOT the smallest in-conversation visual for someone already following (that is show-me), NOT a course with exercises (that is course-builder).
Skill Claude CodeCodex
Use when writing or refactoring Elixir/OTP on the BEAM — GenServers, supervision trees and restart strategies, pattern matching, mix projects and releases — or when processes misbehave (restart loops, mailbox growth, call timeouts). NOT a Phoenix web app, LiveView, Ecto or channels (that is phoenix).
Skill Claude CodeCodex
Use when wiring server code to send transactional or bulk email via Resend, SendGrid, or Postmark: a provider-agnostic sendEmail() seam, idempotent retries, 100-cap batches with partial failures, transactional-vs-broadcast streams, bounce webhooks feeding a suppression list. NOT SPF/DKIM/DMARC inbox reputation (that…
Skill Claude CodeCodex
Use when mail already sent lands in spam, is rejected, or fails the Gmail/Yahoo bulk-sender checks and the fix is authentication and reputation, not the sending code: SPF/DKIM/DMARC alignment, domain warmup, spam-complaint rate, one-click unsubscribe, BIMI. NOT putting mail on the wire through a provider API (that is…
Skill Claude CodeCodex
Use when choosing an embedding model, chunk size, or query form, when semantic search returns irrelevant results, when adding hybrid BM25+vector or a reranker, or when a retrieval change needs a number (recall@k, nDCG, MRR). NOT operating the store — index tuning, quantization (that is vector-db) — nor the…
Skill Claude CodeCodex
Use when designing the reaction to a class of failures — typed error taxonomies, retry/backoff/timeout policy, circuit breakers, React/Next error boundaries, and the user-message vs operator-log split. NOT diagnosing one specific crash (that is debug), NOT logs/metrics/traces (that is observability), NOT the wire…
Skill Claude CodeCodex
Use when shipping a React Native app with Expo — EAS Build/Submit/Update, eas.json profiles and channels, config plugins, prebuild/CNG, runtime-version policy, OTA updates that never land, SDK upgrades, the New Architecture. NOT RN UI, navigation or native-module authoring (that is react-native), NOT a Dart app (that…
Skill Claude CodeCodex
Use when a substantive request needs verified, calibrated reasoning — analysis, diagnosis, review, advice, or a draft the user will act on — even when rigor is not asked for, and most of all when being wrong is expensive or irreversible. NOT casual chat (rigor theater), NOT the SDD gates verify, debug, review; this is…
Skill Claude CodeCodex
Use when calling a fal.ai endpoint by id to generate image, audio, or video from JS/Python/curl: subscribe vs submit, queue states, ED25519 webhook signature verification, per-call cost, or migrating off @fal-ai/serverless-client. NOT which model or art direction (that is ai-media); NOT the same models on another…
Skill Claude CodeCodex needs its repo
Use when building, reviewing, testing, securing or shipping a FastAPI / async Python service — routers, Pydantic v2 schemas, dependency injection, async SQLAlchemy 2.0, OAuth2/JWT, ASGITransport tests, production wiring. NOT language-level Python or packaging (that is python), NOT engine-level SQL (that is…
Skill Claude CodeCodex
Use when running the money side of a small company on a cash basis: a 13-week rolling cash-flow forecast and runway, bank-vs-books reconciliation, mapping spend to tax-return expense categories, or a month-end close. NOT posting journal entries, payroll or depreciation (that is bookkeeping); NOT multi-year projections…
Skill Claude CodeCodex
Use when a founder needs the driver-based 18–36 month projection: revenue, cost and headcount builds resolving to net burn, runway, cash-out date, scenarios and the raise size. NOT the 13-week bank-reconciled cash view (that is finance-ops), NOT single-series forecasting (that is forecasting), NOT running the round…
Skill Claude CodeCodex
Use when adapting an open-weight model to a target form or behavior — tone, output format, reasoning pattern — via LoRA/QLoRA or full fine-tuning with TRL SFTTrainer, then preference optimization (DPO/ORPO/KTO/GRPO), and for fine-tune vs prompt vs RAG. NOT adding facts to a model (that is rag); NOT the single-GPU…
Skill Claude CodeCodex
Use when building on Firebase — Firestore data modeling, Security Rules, Auth and custom claims, Cloud Functions, Storage, modular Web/Admin SDK imports — including symptoms like a database open to the internet, a query rejected by rules, or a doc stuck at 1 write/sec. NOT managed-Postgres BaaS with SQL and RLS (that…
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: