Skillflag

Skillflag + skill-install

This skill documents how to use the Skillflag producer CLI (skillflag) and the installer CLI (skill-install).

What this repo provides

• skillflag --skill list lists bundled skill IDs
• skillflag --skill export exports a skill bundle as a tar stream
• skill-install consumes a skill directory or tar stream and installs it into a target agent scope

Quick start

List skills:

skillflag --skill list

Export the bundled skill and install into Codex repo scope:

skillflag --skill export skillflag | skill-install --agent codex --scope repo

Export the bundled skill and install into Claude repo scope:

skillflag --skill export skillflag | skill-install --agent claude --scope repo

skill-install inputs

Directory input:

skill-install ./skills/skillflag --agent codex --scope repo

Tar stream input (from producer):

skillflag --skill export skillflag | skill-install --agent codex --scope repo

Tar stream input with interactive target selection (when a TTY is available):

skillflag --skill export skillflag | skill-install

Show installer usage/help:

skill-install --help

Notes

• skillflag is the producer interface; it never installs.
• skill-install validates SKILL.md frontmatter and installs by copy.
• The full specification lives at docs/SKILLFLAG_SPEC.md.

Spec essentials (producer)

• Producer CLIs MUST implement:
• --skill list
• --skill export
• --skill list --json MAY be provided and must emit a single JSON object to stdout.
• --skill list writes only skill IDs to stdout (no banners).
• --skill export streams a tar with a single top‑level / and /SKILL.md.
• Export output MUST be deterministic: sorted entries, fixed mtime = 0, uid/gid = 0.
• All errors go to stderr, exit code 1 on failure.
• Skills should be bundled under skills//SKILL.md or .agents/skills//SKILL.md.

Adding Skillflag to a Node CLI (library integration)

Install the library:

npm install skillflag

Global install (exposes skillflag and skill-install on PATH):

npm install -g skillflag

Run without installing (uses bundled binaries):

npx skillflag --skill list
npx skillflag install --agent codex --scope repo ./skills/skillflag

Early‑intercept in your CLI entrypoint so stdout stays clean:

// src/bin/cli.ts
import { findSkillsRoot, maybeHandleSkillflag } from "skillflag";

await maybeHandleSkillflag(process.argv, {
  skillsRoot: findSkillsRoot(import.meta.url),
  // includeBundledSkill: false, // opt out of the built-in skillflag skill
});

// ... normal CLI startup here

Repository layout (bundled skills):

skills/
  my-skill/
    SKILL.md
    templates/...

Portable agent-skill layout is also supported:

.agents/
  skills/
    my-skill/
      SKILL.md
      templates/...

Package distribution:

• Ensure skills/ or .agents/skills/ is included in package.json files so it ships with the npm tarball.

Installing without global install

Use the skillflag install convenience command to avoid a global install:

npx skillflag install --agent codex --scope repo ./skills/skillflag

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: osolmaz
• Source: osolmaz/skillflag
• License: MIT

Install and usage instructions live in the source repository linked above.