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packages/devtools/tooling/install-agent-skills/assets/skills/crypto-cipher/SKILL.md

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+---
+name: crypto-cipher
+description: Use when implementing or debugging code that uses @suaveplan/crypto-cipher: AEAD cipher primitives with per-primitive selector layout: aes-256-gcm, chacha20-poly1305, xchacha20-poly1305.
+---
+
+# @suaveplan/crypto-cipher
+
+Low-level AEAD (Authenticated Encryption with Associated Data) cipher primitives for the `@suaveplan/crypto` stack. Provides three algorithms — AES-256-GCM, ChaCha20-Poly1305, and XChaCha20-Poly1305 — each as a standalone subpath export for tree-shaking. Nonces are always caller-supplied: the package validates nonce length but never generates randomness internally, keeping the CSPRNG boundary in the caller's control. Implementation flavour (`'noble'` vs `'native'`) is selected at build time via `crypto.config.ts`; all Phase 0 implementations route to `@noble/ciphers`. Use `@suaveplan/crypto` for the high-level façade that combines nonce generation, engine selection, and structured error handling; use this package only when you need to supply your own cipher engine implementation.
+
+## When to use this skill
+
+- Implementing or debugging code that imports `@suaveplan/crypto-cipher`.
+- The task touches: see package README.
+- You need API guidance for this package's exports.
+
+## Quick reference
+
+```ts
+import { /* see API Reference below */ } from "@suaveplan/crypto-cipher";
+```
+
+## Dependencies
+
+Workspace dependencies: `@suaveplan/crypto-utils`, `@suaveplan/error`, `@suaveplan/types`
+
+## Where to read more
+
+This skill is intentionally short. The package's own documentation is the authoritative source — read these in order:
+
+1. **`packages/crypto/crypto-cipher/README.md`** — overview, install, quick-start, module index
+2. **`packages/crypto/crypto-cipher/src/**/*.md`** — co-located docs per implementation file (Purpose, Features, Basic + Advanced examples, full API reference, Implementation notes — all packages  ship ≥200 words per module)
+3. **`packages/crypto/crypto-cipher/package.json`** `exports` map — every subpath you can import from
+
+When the user asks an API question, read the relevant co-located `.md` first; do not answer from training-data memory.
+
+## See also
+
+- `@suaveplan/crypto-utils`
+- `@suaveplan/error`
+- `@suaveplan/types`
+
+---
+
+_This SKILL.md is auto-generated by `suaveplan-skills/scripts/generate-skills.ts` from the package's README. Do not edit by hand — re-run the generator after the README changes._