Bounded conversation memory for LLM agents — token-budget rolling window, pinned messages, eviction callback for summarize-and-reinsert, keyword recall over evicted history, JSON export/import. Zero runtime dependencies.

UUID v4+v7 generation, timestamp extraction, time-ordering, version detection

Extract and repair JSON from LLM text output, with a fallback option

Money as integer cents: parsing, formatting, arithmetic, and fair allocation without rounding loss

Instrumentation helpers for perf_hooks with hierarchical section timing and memory tracking

Text hygiene for logs and LLM inputs: control chars, Unicode normalization, zero-width removal, homoglyph detection

Parse/stringify URL query strings: nested bracket notation, arrays, type coercion, prototype-pollution guard

Sliding-window async pool with per-item retry, order preservation, and helpers

Secure webhook receiver with HMAC-SHA256 verification and idempotency

Deterministic random number generators (Mulberry32, Xoshiro128) with sampling, shuffle, weighted pick, and gaussian

Tenant resolution with isolation: hostname, header, and path-based routing

A tracer producing spans with traceId/spanId/parentSpanId, spec-correct W3C traceparent header inject/extract, child spans, span events/tags, duration, and a pluggable exporter interface with bundled Console and InMemory exporters.

Parse Conventional Commits from raw git log text and render a CHANGELOG.md section with a suggested semver bump — zero runtime dependencies.

GraphQL operation guard for a supplied AST: fragment-aware depth limit with cycle guard, per-field complexity scoring, operation allowlist/denylist, and introspection blocking. graphql-js is optional — accepts its document shape structurally, zero hard de

Boundary-respecting text chunking for RAG — sentence/paragraph/markdown-heading aware, configurable overlap, per-chunk metadata, zero runtime dependencies.

Health check registry with timeout per check, critical flag, and express handler

Validate LLM tool/function-call definitions and model-produced arguments — JSON-Schema subset checks, LLM-pitfall linting, path-precise argument errors, coercion mode. Zero runtime dependencies.

Seeded deterministic fake data generator with schema-driven generation

Zero-dependency line-based Myers diff (O(ND)) producing unified-diff hunks, with fuzzy patch application, reject reporting, and word-level intra-line diff highlighting.

One command to run whichever formatters your repo already uses. Detects prettier/eslint/biome by config file + installed binary, runs them, reports a unified per-file result.