Agent Skills Tools

Agent skills are installable capabilities for AI agents. A skill is a folder of markdown, scripts and prompts you load into Claude Code, Codex or OpenClaw, and it changes what the agent can do: run an SEO audit, operate ad accounts, build launch assets. No seat fee, no dashboard, no vendor to call. The category barely existed two years ago, and it is now the fastest-moving layer of martech. Six of the ten fastest-growing open-source repos we track sit in this category, and the biggest mover of the week, Claude SEO, out-grew n8n and LangChain combined.

The speed is not an accident. These packs skip the distribution problem that SaaS never solved: a 55,000-word skill file costs nothing to ship, so quality is decided by issue discipline and documentation, not by a sales team. The trade is that the burden moved to you. Nobody validates a skill's output, nobody holds its hand, and some packs quietly append self-promotion to their results. Provenance is the whole game, which is why every review in this directory comes from installing the pack and shipping something with it.

This directory covers 18 tools, from the 15,000-star Claude SEO that runs a 25-agent audit pipeline, to Marketing Studio that renders launch assets from one command. Claude Ads manages 12 ad platforms. The Email Marketing Bible packs 908 sources into a single file. The MCP server gives agents read and write control of Google Ads, Meta Ads and GA4. Install them on a Saturday, verify everything they output, and you have replaced work that used to require a tool contract.