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The Copilot agent runtime was rewritten from a 130‑k‑line TypeScript/Node.js codebase into a native Rust library (~830 k lines of Rust) to reduce startup latency, memory use, and improve reliability. The migration was done incrementally (in‑place) across 128 PRs, with AI‑generated code handling most of the work. The new runtime exposes a C ABI for in‑process embedding by all six Copilot SDK langu…
A step‑by‑step tutorial showing how to implement HyperLogLog and Count‑Min Sketch in pure TypeScript for Node.js, with a fast MurmurHash3‑x86‑32, memory‑bounded registers, merge support, and a Vitest benchmark suite that runs under `--expose-gc`.
The article shows how to build a deterministic, checkpoint‑backed finite state machine engine in TypeScript for orchestrating multi‑agent AI workflows. It uses Zod for schema validation, better‑sqlite3 for atomic persistence, and a pure transition function to make workflows traceable and recoverable in serverless environments.
A step‑by‑step tutorial showing how to build a typed context‑compaction gate for AI agents in TypeScript using LangChain and Zod. It defines a discriminated‑union schema for keep/summarize/discard actions, implements a fast gpt‑4o‑mini classifier, validates decisions at runtime, and wires the gate as middleware in an agent loop, with testing and production‑grade tuning advice.
Spec‑driven development encodes architectural rules as machine‑readable Zod schemas, letting automated agents (e.g., Copilot, Claude Code) be checked for boundary violations, API drift, and runtime invariants via AST analysis and CI tests.
A step‑by‑step tutorial showing how to run a persistent, free Cloudflare Tunnel alongside a TypeScript/Node.js webhook consumer in Docker Compose, replacing ngrok for local webhook debugging.
This article details building a Generative UI architecture that streams structured JSON component schemas from LLMs, rendering them directly into type-safe React Server Components. It provides a full, from-scratch implementation using Web Streams, Zod, and Next.js 15+, avoiding proprietary libraries.
AI-generated code often passes basic CI but contains subtle bugs like vacuous tests or off-by-one errors. This article details a multi-tier CI/CD pipeline using AST analysis, property-based testing, and mutation testing to catch these issues and annotate GitHub PRs with actionable SARIF reports.
Vercel AI Gateway now offers OpenAI’s GPT‑Live 1, a full‑duplex voice model that can listen and speak simultaneously. The SDK lets you start a voice session and optionally delegate work to any text model, with code examples for both patterns.
The article shows how to replace raw TypeScript compiler output with a programmatic JSON feedback loop that merges diagnostics and Vitest test failures, feeding the structured data back to an LLM coding agent for self‑correction. It provides concrete code for extracting, enriching, validating, and de‑duplicating errors, and demonstrates token savings and deterministic iteration until compilation…
This guide details building a distributed sliding-window rate limiter using TypeScript and Redis. It leverages Redis sorted sets and an atomic Lua script to prevent race conditions and over-admission under high concurrency, supporting dual RPM/TPM quotas.
A step‑by‑step tutorial for building a deterministic AST‑based security scanner that runs in GitHub Actions to catch prototype‑pollution, high‑entropy secrets, and unauthorized network egress in AI‑generated pull requests.
Google partnered with Speakeasy to open‑source their OpenAPI‑based multi‑language SDK generator, covering Python, TypeScript, Go, Java, C#, PHP, and Ruby. The move replaces a now‑defunct proprietary generator, reduces maintenance overhead to ~1 engineer, and adds a CLI and documentation server generator under AGPLv3.
The article walks through building a TypeScript middleware that validates RAG citations by checking exact byte‑span offsets against source buffers, replacing fuzzy heuristics with deterministic guarantees. Benchmarks show sub‑millisecond verification for 1,000 citations across 50 documents.
A vendor‑agnostic JSON Schema manifest for AI agent tools, with a TypeScript adapter layer that compiles the manifest into OpenAI function‑calling and Anthropic Claude formats, plus runtime validation, permission scoping, and execution constraints.
Server‑only code can silently inflate client bundles in Next.js 15+ apps. The article shows how to spot leaks with @next/bundle-analyzer, prevent them by removing shared barrel files or adding the `server-only` guard, and enforce a deny‑list of server modules via a custom ESLint rule that scans the AST of files with a `'use client'` directive. The rule is wired into a CI bundle‑budget check using…
The article shows how to protect AI‑generated shell/SQL commands by parsing them with real AST parsers (tree‑sitter for Bash, Babel for JS‑embedded SQL) and enforcing structural allowlists plus command/path whitelists, instead of fragile regex filters.
TanStack Charts α is a framework‑agnostic, TypeScript‑first charting library that implements a grammar‑of‑graphics API (marks, scales, channels, transforms, layers). It ships as a single npm package with adapters for React, Preact, Vue, Solid, Svelte, Angular, Lit, and vanilla DOM, and can run on server or client. The runtime is headless; type inference stays tied to the source row, so each mark…
A step‑by‑step tutorial for building a zero‑trust WebAuthn passkey recovery flow in Node.js/TypeScript. It covers generating 128‑bit backup codes, hashing them with Argon2id, rate‑limited verification, time‑boxed JWT recovery sessions, and orchestrating new credential registration with @simplewebauthn/server while revoking lost credentials and rotating codes.
The tutorial shows how to build a browser‑only P2P file transfer using WebRTC DataChannels, the Streams API, and WebCrypto to encrypt 64 KB chunks on the fly, while applying backpressure via bufferedAmountLowThreshold. This prevents memory blow‑outs and ensures integrity with per‑chunk SHA‑256 verification.
Vercel AI Gateway now offers the GLM‑5.3‑FlashX model, a fast (~200 tps) multimodal coding LLM. The post includes a TypeScript streaming example, notes the model’s fit for coding agents and interactive tools, and lists AI Gateway features (unified API, usage tracking, retries/failover, custom reporting, key budgets, routing rules) with no platform fee.
Step‑by‑step tutorial showing how to build a stateless composite Model Context Protocol (MCP) gateway in TypeScript using Hono, Zod, and the MCP SDK. It covers config‑driven upstream registration, namespaced tool discovery, JSON‑RPC routing, per‑tool auth middleware, and a token‑bucket rate limiter, with concrete code snippets and design trade‑offs.
Vercel AI Gateway now offers Google’s Gemini 3.8 Live and Live Extended Thinking models through its realtime WebSocket API, enabling real‑time spoken interactions with audio output and parallel reasoning. The post includes a short TypeScript example for token acquisition, WebSocket setup, and handling of realtime events.
Vercel released the @agent-browser/eve extension, giving Eve agents full browser automation capabilities inside their sandbox. It adds installable tools for navigation, interaction, and screenshots, with domain allowlists and credential protection.
Vercel's mcp-handler 2.2.0 adds experimental WebMCP support, letting you expose registered MCP tools to in‑browser agents via a single script tag. The script proxies tool calls back to your MCP server with the signed‑in user’s credentials, so no extra OAuth flow is needed.
