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Build Skill · lukerenton | DecimalAI

agent toolingby lukerenton

Build Skill

lukerenton/build-skill

Source lukerenton/explore-claude-code ↗License MIT

Builds new Claude Code skills with consistent structure, enforced standards, and project-aware configuration.

SkillScore59Maintained

Automatic

AI Engineer pack

Last verified 8/23/2026

What it changes

Passed 12 of 21 test cases with the skill, and 5 of 21 without it.

Without skill23%

With skill59%

Checks it passed that the model alone missed

Includes user-invocable: false in frontmatter
Includes an argument-hint field in frontmatter
Suggests configuring an agent file rather than a skill

and 8 more in the full report

8 fixed5 passed either way9 still failing0 broke

Pass-rate lift: +36 pp
Tokens: +33%
Agent turns: 0%
Response time: -25%

Model gemini-3.6-flashMeasured 8/23/2026v113 of 22 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/lukerenton-build-skill/SKILL.md https://app.decimal.ai/s/lukerenton-build-skill/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add lukerenton-build-skill, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/lukerenton-build-skill/ and pins it in .decimal/skills.lock

decimalai skills add lukerenton-build-skill

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/lukerenton-build-skill/SKILL.md https://app.decimal.ai/s/lukerenton-build-skill/SKILL.md

Raw file: /s/lukerenton-build-skill/SKILL.md ↗ · machine-readable summary at /s/lukerenton-build-skill.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

I need to set up a dedicated sub-agent file with specific execution tools allowed-tools: [ Bash, FileRead ] and an isolated model configuration model: claude-3-5-sonnet. Please generate this file definition for me.

What was checked, without and with the skill
Checked	Without skill	With skill
Explains that skills do not support allowed-tools or model frontmatter fields	Missed	Passed
Recommends building an agent configuration instead of a skill	Missed	Passed

case-04 · gemini-3.6-flash · 8/23/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md107 linessingle file

You are a skill builder. You create well-structured, consistent Claude Code SKILL.md files that follow established standards. Your output is a complete, ready-to-use skill file.

Process

1. Assess Input Completeness

Read what the user provided in $ARGUMENTS and the surrounding conversation context. Determine how much is already specified vs what needs clarification.

Categorize as:

Minimal (just a name or vague idea): Full Q&A needed
Medium (clear purpose but missing details): Targeted questions only
Rich (detailed description with specifics): Confirm and clarify 1-2 things

2. Adaptive Q&A

Ask only what's missing. Never re-ask what's already clear. Cover these areas as needed:

Intent: What problem does this skill solve? What's the trigger scenario?
Invocation: User-only (disable-model-invocation: true), Claude-only (user-invocable: false), or both (default)?
Arguments: Does it accept arguments? What format?
Supporting files: Does it need templates, scripts, or reference docs?
Team membership: Is this a standalone utility or joining the core agent team?
Scope: If the skill needs restricted tools, forked execution, or a specific model, suggest building it as an agent instead (skills do not support allowed-tools, model, context, or hooks frontmatter).

3. Check for Overlap

Before drafting, scan .claude/skills/ for existing skills with similar purpose. If significant overlap exists, warn the user and suggest modifying the existing skill instead. Proceed only if the user confirms they want a new one.

4. Draft the Skill

Write the SKILL.md following these structural principles:

Supported frontmatter fields (in order):

name
description
argument-hint
disable-model-invocation
user-invocable

Track record

Benchmark

12 / 21

test cases passed, vs 5 / 21 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

lukerenton / explore-claude-code

.claude/skills/build-skill/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

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