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Get Started Free →Use when creating, reviewing, or maintaining a Skill Bundle: one visible top-level skill that routes to multiple hidden SUB_SKILL.md Sub-Skills using the root skill_bundle_template.md template and progressive-disclosure loading.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-01 | ✗→✓ | ▲ Improved | 54% | 0% |
| case-02 | ✗→✓ | ▲ Improved | -9% | 0% |
| case-03 | ✗→✓ | ▲ Improved | -2% | 0% |
| case-08 | ✗→✓ | ▲ Improved | 174% | 0% |
| case-11 | ✗→✓ | ▲ Improved | -7% | 0% |
Create or review Skill Bundles. A Skill Bundle does not provide domain capabilities itself; only the bundled Sub-Skills do the real work.
skill_bundle_template.md as the authoritative template for the generated bundle SKILL.md.SKILL.md short: runtime rule, dispatch map, and essential bundle-specific notes only.SKILL.md.SKILL.md to SUB_SKILL.md.bundled-skills/manifest.json.SKILL.md, agents/openai.yaml, and bundled-skills/.bundled-skills/<subskill-slug>/.SKILL.md to SUB_SKILL.md; do not leave discoverable SKILL.md files below bundled-skills/.skill_bundle_template.md to write the generated bundle SKILL.md.bundled-skills/index.json for runtime routing when the dispatch map is not enough.bundled-skills/manifest.json only for review, audit, source, license, and update context. For every Git-backed source, include at least its repository URL and resolved base commit; include tag, branch, or source path when known.text<bundle-slug>/ SKILL.md agents/openai.yaml bundled-skills/ index.json manifest.json <subskill-slug>/ SUB_SKILL.md ...
Open skill_bundle_template.md before writing a generated bundle SKILL.md. Replace placeholders, remove unused optional notes, and keep the result shorter than the source skills it routes to.
The generated dispatch map should help choose likely Sub-Skills without opening every copied folder. Put detailed capability metadata in index.json, not in the top-level bundle SKILL.md.
find bundled-skills -name SKILL.md returns no files.index.json is valid JSON and points to existing SUB_SKILL.md files.manifest.json, if present, is valid JSON and is not required for normal runtime use.manifest.json include a repository URL and resolved base commit.agents/openai.yaml exists and describes the generated bundle, not this Skill Bundler.SKILL.md says to load only relevant Sub-Skills after the task need is clear.SKILL.md stays compact and does not duplicate Sub-Skill instructions.Other measured skills in the registry, with their headline benchmark lift.