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Skilldex
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What is Skilldex

Skilldex is a package manager for agent skills. It lets you search, install, validate, and publish skills — folders of instructions and resources, built around a SKILL.md file, that teach a coding agent how to do something specific.

Think of it like npm, but for agent capabilities instead of JavaScript libraries.

The problem it solves

Skills are powerful, but they live scattered across individual repositories with no standard way to find or reuse them. A good skill written for one project is hard to use in another, and a skill found on GitHub says nothing about whether it follows the format agents expect.

Skilldex fixes this with three things:

  1. A CLI (skillpm, or spm for short) for installing and managing skills
  2. A registry of skills you can search from the terminal or the web
  3. A validator that scores every skill against the skill format specification

Key concepts

Skills

A skill is a directory with a SKILL.md at its root: YAML frontmatter with a name and a description, followed by the instructions the agent follows. It can also carry scripts/, references/, and assets/. See Skill format.

Skills are installed into one of three scopes — project (the default), shared, or global — and linked into the directories your agents read, so Claude Code, Codex, Cursor, and other agents pick them up. See Scopes.

The registry

The registry indexes skills published on GitHub. Names are only unique within an owner, so the registry addresses a skill as owner/name:

skillpm install anthropics/pdf

The CLI looks the skill up, clones it from its source repository, validates it, and installs it.

Quality scores

Every skill has a format conformance score (0–100): how closely it follows the skill format specification. It measures format, not usefulness. See Quality scoring.

Skillsets

A skillset is a named bundle of skills installed together, with shared conventions its members are checked against. See skillpm skillset.

Next steps