Skill2 Create

Create Agent Skills

Create the smallest reusable instruction set that changes agent behavior without duplicating existing ownership.

Scope

| Signal | Landing | | --- | --- | | Distinct reusable trigger and standalone workflow | Top-level skills//SKILL.md | | More depth under the same trigger and workflow | references/ under the owning skill | | Repo-bound paths, commands, or conventions | Project-local skill | | One-off answer or pure mechanical rule | No skill → script / validator / docs / lint / CI |

When uncertain, prefer references/ or project-local placement over expanding the top-level namespace.

Authoring

1. Define user trigger, desired behavior, output, and hard constraints.
2. Find existing ownership before creating a new top-level skill.
3. Choose scope and name from user intent, not implementation or one harness.
4. Write minimal SKILL.md; add resources only when they reduce noise or make execution deterministic.
5. Apply changes only when requested. Run repository validator when available.

SKILL.md

• Plain Markdown with YAML frontmatter
• name: kebab-case; match directory name
• description: trigger conditions only; do not summarize workflow
• Body: principles, decisions, constraints, and output contract
• Keep instructions terse; explain only non-obvious choices
• Use relative paths; never embed secrets or accidental machine-local paths
• Preserve existing user rules unless change is required

Resources

| Resource | Use | | --- | --- | | references/ | Heavy detail loaded under the same trigger | | scripts/ | Deterministic, repeated, or fragile execution | | assets/ | Files copied or transformed into deliverables |

Create only needed directories. Keep references one hop from SKILL.md. Do not nest discoverable skills. Do not create optional metadata unless the target repository or distribution format requires it.

Commands

Skill-owned scaffold:

uv run --script /scripts/run -- scaffold skill 

Library decisions

• Split when users invoke workflows independently or ownership diverges
• Merge when triggers overlap, shared rules dominate, and one owner can maintain both
• Keep shared content with the narrowest owner serving every consumer
• Avoid duplicate instructions across sibling skills
• Keep top-level namespace flat and minimal

Common mistakes

| Mistake | Better choice | | --- | --- | | Workflow summary inside description | Trigger-only description; workflow in body | | New skill for a long table under the same trigger | references/ under the owner | | Global skill for one repo's conventions | Project-local skill or repo instructions | | Skill for a regex-enforceable rule | Validator, lint, or CI | | Empty resource directories | Create resources only when used | | Harness-specific instructions in shared behavior | Harness-neutral rule or adapter-specific helper |

Output

1. Scope decision: top-level / reference / project-local / no skill
2. Skill topology and ownership boundary
3. Created or updated files
4. Deterministic validation result, when available

Source & license

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

• Author: blackblue-labs
• Source: blackblue-labs/skill2
• License: MIT

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