Dev Tools Directory

Agent Skills Discovery RFC

Cloudflare's draft spec for publishing Agent Skills at a predictable URL — an index at /.well-known/agent-skills/ lists each skill as a single artifact with a type, a URL and a SHA-256 digest. Apache-2.0, v0.2.0, and a draft rather than a ratified IETF RFC.

PostHog MCP Analytics

Analytics for MCP servers — every tool call an agent makes lands as a normal PostHog event, so you get per-tool failure and latency, the agent's own account of what it was after, and the tools it went looking for and didn't find. Beta, behind a feature preview.

binpatch

Binary delta-update engine from BYK. Publish a bsdiff+zstd patch next to each release and a self-updating binary walks the chain from the installed version to the target instead of downloading itself again. Zero runtime dependencies, MIT.

harness-doctor

Claude Code / Codex skill that mines the last N days of Claude Code transcripts across every project on the machine into five fact tables — bash, errors, tokens, human corrections, fan-out — and returns a ranked list of fixes with the measured number behind each one.

Herdr

Open-source terminal multiplexer built for coding agents — run Claude Code, Codex, OpenCode and more from one terminal on any box, with persistent PTY sessions you can detach and reattach from any device, even a phone over SSH.

Effect Skill

Kit Langton's opinionated agent skill for building production TypeScript apps with Effect v4 — workflows, services, layers, schemas, config, schedules, caches, streams, HTTP clients, and tests, with current APIs and production defaults.

context-doctor

Claude Code / Codex skill that audits the fixed context a coding agent auto-loads every session — tool/MCP definitions, connectors, plugins, skills, subagents, memory/rules files — and proposes ranked cuts to prune, gate, or route what's loaded but unused.

integrations.sh

A registry of 5,700+ integration specs from Rhys Sullivan — the same builder behind Executor. Every service normalized into MCP, OpenAPI, GraphQL, and CLI form, each surface leading with a grounded, cited credential guide agents can act on.

memory-view

Claude Code / Codex skill that reads a project's auto-memory vault and generates a self-contained HTML explorer to visualize what the agent has remembered — MEMORY.md plus topic files — without editing or managing it.

session-report

Claude Code / Codex skill that generates a self-contained HTML report debugging what is in a session's context window and how every token is spent — context budget, retained thinking, the dumb-zone cutoff, loaded CLAUDE.md and skills, and full history.

Eve

Open-source agent framework from Vercel — define agents as directories of TypeScript and Markdown config and deploy them as standard Vercel projects.

Flue

TypeScript framework for building durable AI agents and workflows with no vendor lock-in — write once, deploy anywhere, run on any LLM.

fff

The fastest and most accurate file search toolkit for AI agents, Neovim, Rust, C, and Node. Keeps an in-memory index for sub-10ms queries instead of spawning ripgrep/fzf per search.

Infisical

Open-source security platform for developers and AI agents — secrets management, certificate management (PKI), and privileged access (PAM) under a single identity model with unified auditing.

netxjs-monorepo

Opinionated Next.js + Turborepo starter with Biome linting, TypeScript, shadcn/ui, and pre-loaded Claude Code agent skills and hooks.

Mediabunny

TypeScript library for reading, writing, and converting media files directly in the browser — like FFmpeg, but for the web. Zero dependencies, tree-shakable, and hardware-accelerated via the WebCodecs API.

deepsec

AI-powered vulnerability scanner that uses coding agents to perform deep security analysis of codebases — regex-based candidate matching followed by LLM-driven investigation, with support for distributed execution and PR diff review.

npm-deps-cleanup

AI agent skill that audits and reduces JavaScript package dependency footprint — removes unused deps, deduplicates workspace versions, analyzes transitive closures, and applies e18e replacement recommendations. Works with npm, pnpm, Yarn, and Bun.

How We Test TanStack AI Across 7 Providers

How TanStack AI runs 137 deterministic tests across 7 LLM providers in ~2 minutes on every PR using a mock server instead of real API calls.

Accept Markdown

Protocol and implementation guide for serving Markdown to AI agents via HTTP content negotiation — same URL delivers HTML to browsers, Markdown to AI.

Is It Agent Ready?

Scanner that evaluates website compliance with AI agent standards — checks robots.txt, Markdown negotiation, MCP servers, OAuth, and agent protocols.

noqa

AI-powered QA platform that automates mobile app testing with visual AI agents — write tests in plain language, run across iOS and Android on 1000+ real devices.

SEO Lens

Chrome extension that audits SEO metadata on any webpage with instant scoring, structured data validation, and AI-friendly copyable reports for Claude Code and Cursor.

Pullfrog

AI PR review agent from Zod's creator. Dynamically scales effort, uses subagent swarms for large PRs, and runs inside GitHub Actions with batteries-included MCP tools.

Executor

Open-source tool gateway for agents from Rhys Sullivan. Normalizes MCP, OpenAPI, GraphQL, and custom sources into one typed SDK that agents call in a sandbox — built on Cloudflare's Code Mode pattern.

Browser Use

Open-source browser automation harness that lets AI agents navigate and interact with websites at scale.

Effect Institute

Interactive online learning platform with narrated video tutorials for the Effect-TS library.

Effect Solutions

Prescriptive guide and reference for writing idiomatic Effect-TS programs with setup, patterns, and ecosystem docs.

Effect

TypeScript library for building robust apps with typed errors, structured concurrency, retries, and first-class OpenTelemetry observability.

Exa

Search API built for AI agents, returning fast, high-quality web results with structured content extraction.

Fallow

CLI tool that analyzes TypeScript and JavaScript codebases to find unused exports, dead code, and complexity hotspots.

Firecrawl

Web crawling and scraping API that converts any website into LLM-ready markdown or structured JSON.

Google CheckMX

Google Apps Toolbox utility that checks MX, SPF, and DKIM DNS records to diagnose email delivery configuration issues.

GPTZero

AI content detection platform that identifies text generated by ChatGPT, Claude, Gemini, and other LLMs.

Inkless

Free e-signature platform for uploading, signing, and sending unlimited documents without a subscription.

Langfuse

Open-source LLM engineering platform for tracing, prompt management, evaluations, and production monitoring.

Lighthouse HQ

Immigration platform that guides international professionals through U.S. visa applications with document prep and expert support.

Models.dev

Open-source database of AI model specs, pricing, and capabilities queryable via a JSON API.

OpenPhone

Business phone system that provides virtual numbers, shared calling, and texting for teams in one app.

Perplexity API

API platform providing real-time web search and grounded LLM responses with citations via Sonar models.

React Doctor

Static analysis tool that evaluates React codebases across security, performance, correctness, and architecture, producing a health score with diagnostics.

Resend

Developer-first email API for sending transactional and marketing email, with multi-language SDKs, a CLI, and React Email templating.

ScrapingBee

Web scraping API that handles headless Chrome rendering, proxy rotation, and anti-bot bypassing automatically.

Stagehand

Open-source SDK for building browser agents using natural language instructions instead of brittle selectors.

Ultracite

Zero-config preset that wires up linters, formatters, editor settings, and AI-agent rule files for JavaScript and TypeScript projects.

Unipile

Unified API for reading and sending messages across LinkedIn, email, WhatsApp, Telegram, and calendars.

agent-eval

Testing framework for measuring how well AI coding agents perform against your framework or configuration.

emulate

Local API emulator that provides stateful, production-fidelity stubs for services like GitHub, Google, and Slack.

portless

Replaces localhost port numbers with stable named URLs and enables HTTPS and HTTP/2 for local dev servers.

VERT

Free, privacy-first file converter that runs entirely in the browser using WebAssembly. Supports images, videos, audio, documents, and more with no uploads required.

Zenblog

Headless CMS with a Notion-style editor, hosted media uploads, and a type-safe API client for developer-managed blogs.