31 skills, 7 runbooks: Open Skills is the library that stops your setup from breaking when you switch tools.

Source: Nate’s Newsletter Date: 2026-06-19 URL: https://natesnewsletter.substack.com/p/claude-codex-agent-skills

Summary

The same Nate’s Newsletter article introduces Open Skills: a public library of 31 agent skills and 7 runbooks designed to work across Claude Code, Codex, and Cursor without vendor lock-in. The library demonstrates that the same skill packages can execute on multiple platforms, and provides a framework for distinguishing owned versus rented workflows.

Implications

• Agent layer: Open Skills is an early bet on a cross-platform skill format; if it gains adoption it could pressure vendors to converge on a common SKILL.md-style schema.
• Supply-chain: A shared public library for agent runbooks introduces a new dependency surface — skills installed from external sources carry the same supply-chain risk as npm packages.
• Capability clocks: The existence of a portability library at this stage suggests the agent tooling market is fragmenting fast enough that practitioners are already building abstraction layers over it.