A knowledge vault that acts — your notes, your AI agents, on your machine, yours. Local-first Markdown vault, any model (API key or local), agents that work under capability contracts, every change reversible.






Lightweight deep clone supporting Date, Map, Set, RegExp, typed arrays, and circular references





HTTP Accept header negotiation with q-values and specificity ordering

In-memory sliding-window rate limiter

Parse human-readable durations to milliseconds and format back; ISO 8601 support

RFC 6238 TOTP + RFC 4226 HOTP over Node's built-in crypto: base32 codec, SHA1/SHA256/SHA512, verify with a ± window, otpauth:// provisioning URIs, constant-time compare. Validated against the RFC 6238 Appendix B test vectors.

Minimal text-and-lines PDF 1.4 writer built from scratch, zero dependencies. Helvetica core font, multi-page, mm/pt units.

Layered configuration loader with JSON file and environment variable support

OpenAPI 3.0 generator from code-defined routes: define(method, path, {...}) with a tiny schema notation, emit valid openapi.json plus a markdown reference. Zero dependencies.

Typed Content-Security-Policy builder with directives, nonce/hash helpers, and header generation

Deterministic feature flag evaluation engine: boolean flags, percentage rollout via consistent hashing, attribute targeting rules (eq/in/gt/lt), environment overrides, and a pluggable async store.