#Modern.js For AI

Modern.js provides a toolkit for AI agents that helps developers use AI to efficiently complete feature development, dependency upgrades, and version migration for Modern.js applications.

#llms.txt

Modern.js docs follow the llms.txt specification, auto-generated by @rspress/plugin-llms, accessible via /llms.txt or /llms-full.txt:

• Index: https://modernjs.dev/llms.txt
• Full text: https://modernjs.dev/llms-full.txt (large — fetch on demand)

Most "what is this API / config" questions can be answered from llms.txt. Just let your agent retrieve it on demand; no need to copy docs into your project.

#Skills

Skills are on-demand AI capabilities following the Agent Skills open standard. User-facing Skills:

Skills are not force-installed or implicitly installed — you install them explicitly. RSC and micro-frontend setups are configuration or architecture decisions, not one-click modernjs-feature-enable actions.

#Installing Skills

Modern.js user-facing Skills live in the repo's root skills/ directory and follow the Agent Skills open standard. The recommended way is the standard skills CLI, installing straight from GitHub:

# List installable Skills
npx skills add web-infra-dev/modern.js --list

# Install a single Skill into your agent directory (--agent: claude-code / codex / cursor / ...)
npx skills add web-infra-dev/modern.js --skill modernjs-migrate-to-v3 --agent codex -y

It installs the entire Skill directory (SKILL.md + scripts/ + references/) into the corresponding agent directory, ready to trigger there.

To pin a specific version, append #<ref> (a tag, branch, or commit) to the repo — it installs the Skill as of that ref (replace <tag> with a release tag that contains this Skill):

npx skills add web-infra-dev/modern.js#<tag> --skill modernjs-migrate-to-v3 --agent codex -y