Stop re-explaining your codebase to every AI agent — `cast-skills`

Developer Pedro Castanha released cast-skills, a CLI tool that bootstraps cross-tool AI skills for project knowledge. It installs native SKILL.md files into Claude Code, GitHub Copilot, Gemini CLI, and Codex, and auto-converts for Cursor and Windsurf, enabling agents to load only relevant context per session instead of re-explaining the entire codebase.

Every session, the agent forgets: So you re-explain. It rewrites. Context drifts. Tokens burn. Dumping a 40k-token AGENTS.md into every prompt is not a strategy. It’s a tax. I wanted something simpler: write project knowledge once , in a format agents already understand, and install it into every tool I actually use . That’s cast-skills https://github.com/pedrocastanha/cast-skills . npx cast-skills cast-skills is a small CLI that bootstraps cross-tool AI skills for your machine or project : | Skill | Job | |---|---| using-project-skills | Always-on router. When you start a feature/fix/refactor, it loads project context and routes work through the right module + workflow. | creating-project-skills | Bootstrapper /skill-creator . Reads the repo, asks sharp questions, generates a project skill tree. | explaining-changes | After non-trivial work, offers a beginner-friendly explanation ELI5 → runtime as Markdown/HTML. | Skills use the open SKILL.md https://agentskills.io format — progressive disclosure: the agent loads what it needs, not your entire wiki every turn. cast-skills is built around Anthropic's Agent Skills approach: instead of loading one massive prompt every session, the agent progressively loads only the knowledge it needs. The wizard auto-detects what you have and drops skills in the right place: | Tool | Where it goes | Format | |---|---|---| | Claude Code | ~/.claude/skills/ | native SKILL.md | | GitHub Copilot | ~/.copilot/skills/ | native | | Gemini CLI | ~/.gemini/skills/ | native | | Codex | ~/.agents/skills/ | native | | Cursor | .cursor/skills/ project | converted .mdc | | Windsurf | .windsurf/rules/ project | converted rules | Native tools get SKILL.md as-is. Cursor/Windsurf get an auto-converted format so you’re not maintaining six copies by hand. npx cast-skills or npm i -g cast-skills && cast-skills Requires Node ≥ 18. using-project-skills explaining-changes The point isn’t another chatbot persona. It’s stable project memory that survives sessions and tools. Most of us don’t live in one harness. Monday: Claude Code. Tuesday: Cursor on a design-heavy UI. Wednesday: Copilot in a boring enterprise repo. If “project brain” only works in one tool, you still re-explain on Tuesday. cast-skills optimizes for write once → run everywhere that speaks skills/rules . If your team has no conventions, the bootstrapper will still force a few useful questions. That’s a feature. cd your-repo npx cast-skills Pick the tools you use → let it install the three skills → start a real task and see if the agent stops inventing your architecture from scratch. Repo: github.com/pedrocastanha/cast-skills https://github.com/pedrocastanha/cast-skills npm: npmjs.com/package/cast-skills https://www.npmjs.com/package/cast-skills If you try it, tell me: Issues and PRs welcome — especially path fixes for tool updates these CLIs move the goalposts often .