create-skill

A skill that creates a new coding-agent skill from a one-line description and submits the result as a GitHub pull request, a proposed change for review.

In plain words
What is it for?
Use it to request skills that monitor sources, fetch data, generate files, analyze information, track changes, or send alerts. The request can specify the action, data source, output, and schedule.
Why use it?
It turns a rough automation idea into a structured, reviewable skill and checks for similar existing skills before creating it.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/aeonfun/aeon/create-skill
Any agent
npx skills add aeonfun/aeon --skill create-skill
Clone the repo
git clone --depth 1 https://github.com/aeonfun/aeon

Made for: Claude Code, Codex.

Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,784 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00020 $0.03784
Opus 5 $0.00010 $0.01892
Sonnet 5 $0.00004 $0.00757
Haiku 4.5 $0.00002 $0.00378

Measured 2d ago against content hash 312b970cc904, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

create-skill scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

2. **{Step title}.** {More instructions. Code blocks for curl/bash when relevant.}
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

skills/create-skill/SKILL.md · 260 lines

How it starts

The opening of the file, as written. The whole thing — 260 lines — stays where its author put it; the contents beside it link to each section on GitHub.

${var} — A natural-language description of the skill to create. Required. Example: "monitor Hacker News for AI papers and send a summary" or "track gas prices on Ethereum and alert when below 10 gwei".

If ${var} is empty, exit CREATE_SKILL_NO_VAR:

./notify "create-skill aborted: var empty — pass a description e.g. \"monitor X for Y\""

Then stop.

Today is ${today}. Your task is to generate a complete, production-ready skill from ${var}, score it against a quality bar, and ship it as a PR — never commit directly to main.

Steps

  1. Parse the request. Extract from ${var}:

    • Core action verb (monitor, fetch, generate, analyze, alert, track, scan, etc.)
    • Data source(s) — APIs, websites, RSS, on-chain, GitHub, etc.
    • Output format — notification, article, file, PR, dashboard, etc.
    • Configurable parameter(s) the new skill will accept via its own ${var}
    • Suggested cadence (daily, hourly, weekly, on-demand)

    Save a one-paragraph structured request summary; you'll use it in the PR body.

  2. Duplicate detection (deep — not just ls). Find functional overlap, not just name collision.

    keywords=$(echo "${var}" | tr '[:upper:]' '[:lower:]' | grep -oE '[a-z]{4,}' \
      | grep -vE '^(send|with|from|that|this|when|each|into|over|some|like|just|than|then|also|will|have|been|using|monitor|track|fetch|alert)$' \
      | sort -u)
    for kw in $keywords; do
      grep -liE "$kw" skills/*/SKILL.md | head -5
    done
    

    Read the top 3 candidates fully. For each, judge: does it already do this? Could the request be solved by running an existing skill with a different var=?

    • Near-duplicate exists → exit CREATE_SKILL_DUPLICATE. Notify with the existing skill name and a one-line suggestion ("use existing {skill} with var={...} instead"). Stop.
    • Functionally adjacent → design the new skill to complement (different angle/cadence/output). Document the boundary in the PR body.
  3. Research the data sources. For every API or data source the new skill needs:

    • WebSearch for the current API documentation. Cross-check against a secondary source when feasible (a recent GitHub repo using it, an official changelog, or a Stack Overflow answer dated ≥2026) to confirm the endpoint isn't deprecated.
    • WebFetch the canonical docs URL — record it as a comment in the SKILL.md and in the PR body's "Sources researched" section.
    • Identify exact endpoints, required headers, auth scheme, response schema, and rate limits.
    • Note every required environment variable / API key.
    • Determine fallback strategy when an optional API key isn't set (WebSearch / WebFetch / cached data / public endpoint).

    Research bar (soft): at least one confirmed source URL or exemplar (a working docs page or a public repo using the API). If none, do not hard-abort — log CREATE_SKILL_INSUFFICIENT_RESEARCH, ask the operator via ./notify with what was tried and why each source failed, and stop. The operator can re-dispatch with a clearer prompt or a source hint.

  4. New-secret guard. Secrets values are never inspectable from the workflow — only names are listed. Use gh api repos/:owner/:repo/actions/secrets --jq '.secrets[].name' to read the names of secrets already configured (this endpoint returns names only, never values). Cross-reference with env-var usage in aeon.yml and existing workflows. For each env var the new skill needs:

    • Name present → continue.
    • Name missing → record as NEW_SECRET_REQUIRED. The generated skill must gracefully degrade or skip when the secret is absent (no hard crash). Add a ### Required secrets section to the PR body listing what the operator must add to GitHub Actions secrets before enabling.

    If the secret has no graceful fallback, the generated skill's step 1 must do:

    if [ -z "$VAR" ]; then ./notify "{skill} skipped: VAR not set"; exit 0; fi
    

Read the full file on GitHub · 260 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 260 lines · 20 tokens per session scan A 312b970cc904

Subscribe to this mod's changes

create-skill is a skill published in the GitHub repository aeonfun/aeon (706 stars, last pushed 2d ago), licensed MIT. It adds 20 tokens to every session and 3,784 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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