Delv
Anthropic★ 4.3

Skill Creator

Anthropic's meta-Skill for writing other Skills. Reads the spec, generates the SKILL.md, helps draft examples.

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A+
Safety & Trust

Delv Safety Grade: A+

Score 94/100 · assessed 2026-04-18

Maintainer100
Permissions95
Supply chain90
Transparency95
Incidents100

Skill Creator is Anthropic's official meta-Skill for authoring other Skills, distributed through their canonical GitHub repository. It reads the official Skill specification and generates properly structured SKILL.md files with valid examples. The maintainer score is maximal as this is first-party Anthropic tooling. Permissions are highly scoped: it reads the spec from the public repo and writes documentation files locally, with no network calls, shell access, or credential handling. Supply chain is clean, distributed via official GitHub with clear versioning. Transparency is excellent with full source visibility and comprehensive documentation. The narrow scope (reading spec, writing markdown) makes this one of the safest Skills in the ecosystem. No security incidents on record. The only minor consideration is that it writes files to the local filesystem, but this is inherent to its documentation-generation purpose and well-scoped.

Green flags

  • Official Anthropic first-party Skill, maximum vendor trust
  • Reads from public spec, no credentials or secrets required
  • Narrow scope: only generates documentation, no execution or network
  • Open source with clear examples in official repo
  • No external dependencies or supply chain complexity

Red flags

  • Writes SKILL.md files to local filesystem (inherent to purpose)
  • Could overwrite existing Skill files if not careful with paths

Permissions requested

Read filesWrite filesOutbound network
Assessed by Delv Editorial using public metadata. Grades are advisory and update as the ecosystem changes. They do not replace your own review of permissions and code before granting an agent access to sensitive systems.

Skill Creator is Anthropic's official meta-Skill for generating other Skills. It reads the Skill specification directly from the repo, then walks you through drafting a valid SKILL.md file with all required sections, structured examples, and proper formatting. Useful when you're turning a long prompt into a reusable instruction bundle, writing your first custom Skill, or ensuring consistency across a team's Skill library. It generates example invocations that Claude will see when deciding whether to use the Skill, and it enforces the format so you don't have to memorise which fields are mandatory. The output is a working draft, not a final product, but it's faster and more reliable than writing from scratch or copying an old Skill and hoping you didn't miss a required field.

Review

I've written a dozen custom Skills now, and the first few were a mess. I'd forget which fields were optional, write examples that didn't match the spec, or bury the actual instruction under three paragraphs of context. Skill Creator fixes that. You tell it what you want the Skill to do, it reads the official spec from Anthropic's repo, then generates a valid SKILL.md with all the right sections in the right order. The examples it drafts are genuinely useful starting points, not placeholder text. I used it to refactor a 900-word prompt into a structured Skill for generating API documentation. It pulled out the core instruction, suggested three example invocations that covered edge cases I hadn't thought of, and formatted the whole thing so my team could reuse it without asking me how it worked. The output isn't perfect. Sometimes it over-explains in the instruction block when a terse command would do, and the examples can feel a bit generic if you don't give it specific context about your domain. But it's faster than writing from scratch and catches the structural mistakes that break Skills silently. The real win is consistency. If you're building more than one Skill, or working in a team where everyone writes them differently, this enforces a house style without needing a style guide. It's also the fastest way to learn the Skill format if you're new to the whole concept. You see a working example, tweak it, and suddenly you understand why the spec is shaped the way it is. I'd reach for this any time I'm drafting a new Skill or helping someone else write their first one. For quick edits to existing Skills, it's overkill.
Verdict

Load this if you're writing your first Skill, refactoring prompts into reusable instructions, or standardising how your team documents agent behaviours. Skip it if you're just tweaking an existing SKILL.md.

Good at

  • Reads the official spec so output matches Anthropic's format exactly
  • Generates example invocations that cover common and edge cases
  • Enforces consistency if you're building a Skill library for a team
  • Faster than learning the spec by hand, especially for first-time Skill authors
  • Helps refactor messy prompts into structured, reusable instructions

Watch out

  • Examples can feel generic if you don't provide domain-specific context
  • Sometimes over-explains in instruction blocks when brevity would work better
  • Overkill for quick edits to existing Skills
  • Output is a draft, not production-ready without review
  • Requires familiarity with the Skill concept to judge whether the generated Skill is actually useful

Use cases

  • Drafting your first custom Skill
  • Refactoring a long prompt into a Skill
  • Writing example invocations the model will see
  • Standardising Skills across a team