Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/mblode/agent-skillsnpx agentmods add skills/mblode/agent-skills/agent-skills-creatorWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mblode/agent-skills/agent-skills-creator)<a href="https://agentmods.dev/skills/mblode/agent-skills/agent-skills-creator"><img src="https://agentmods.dev/badge/skills/mblode/agent-skills/agent-skills-creator/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mblode/agent-skills/agent-skills-creator"><img src="https://agentmods.dev/badge/skills/mblode/agent-skills/agent-skills-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Rogue Agent · line 50 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 68 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- medium Rogue Agent · line 49 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00076 | $0.02590 |
| Opus 5 | $0.00038 | $0.01295 |
| Sonnet 5 | $0.00015 | $0.00518 |
| Haiku 4.5 | $0.00008 | $0.00259 |
Grade A, and why
agent-skills-creator scanned grade A with 0 findings 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 4d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 145 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Skills Creator
Create and improve skills in the Agent Skills open format: full lifecycle from pattern selection through validation and README update.
- IS: creating new agent skills and auditing or rewriting existing ones: SKILL.md, references, rules folders, scripts, evaluations.
- IS NOT: AGENTS.md/CLAUDE.md instruction files (use
agents-md) or general documentation quality (usedocs-writing).
Choose a Mode
- New skill → Creation Workflow below.
- Audit, improve, or rewrite an existing skill →
references/improving-existing-skills.md, which scores eleven audit dimensions, runs an ordered rewrite, then reuses Steps 5-8 for validation and shipping. - Simplify a skill or update a collection → same reference, plus
references/capability-delta.mdfor retention decisions and the collection ledger. - Skill never triggers, or triggers on the wrong prompts → the Routing Evals section of
references/evaluation-and-iteration.md, then the description. Body edits do not fix routing.
Reference Files
| File | Read When |
|---|---|
references/capability-delta.md |
Removing generic coaching, evaluating model upgrades, or auditing a whole collection |
references/authoring-tips.md |
Default when writing or cutting body content: judgement over rules, constraint calibration, degrees of freedom, content patterns, descriptions |
references/skill-patterns.md |
Choosing a structural pattern |
references/format-specification.md |
Directory layout, spec versus Claude Code-only frontmatter, body substitutions, loading semantics, which host reads the skill from where and what each can do, naming |
references/rules-folder-structure.md |
Building a rules-based audit/lint skill |
references/improving-existing-skills.md |
Auditing, scoring, simplifying, or rewriting an existing skill |
references/executable-code.md |
Skill includes scripts, injects live context with !, depends on packages, or invokes MCP tools |
references/evaluation-and-iteration.md |
Writing evals/evals.json, routing tests, ablating constraints, testing across models |
references/adopt-adapt-author.md |
A public skill already covers this ground, or deciding whether to vendor, adapt, or replace a third-party skill |
What ships with it
11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- evals/evals.json 4.8 KB
- references/adopt-adapt-author.md 4.2 KB
- references/authoring-tips.md 16 KB
- references/capability-delta.md 3.9 KB
- references/evaluation-and-iteration.md 8.7 KB
- references/executable-code.md 7.3 KB
- references/format-specification.md 4.2 KB
- references/improving-existing-skills.md 9.4 KB
- references/rules-folder-structure.md 2.3 KB
- references/skill-patterns.md 4.3 KB
- scripts/validate.sh 20 KB runs code
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.
- 4d ago Changed · -8 lines · -106 tokens per session scan B → A 8d076a01dc6e
- 10d ago First seen · 153 lines · 182 tokens per session scan B dc8228574eff
agent-skills-creator is a skill published in the GitHub repository mblode/agent-skills (106 stars, last pushed 2d ago), licensed MIT. It adds 76 tokens to every session and 2,590 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
spawn-reviewers
Spawn and collect the reviewer fleet at stage20spawnreviewers. Consumes spawn.json.spec (the authoritative spawn spec from derive-spawn-spec / derive-static-spec), resolves GRAPHPROJECT, builds per-agent prompts from the per-agent template + role suffixes (Bug Hunter A/B, Unified Auditor, Domain Critics, Impact…
design-inventory
Use to run the Claude Design to ClosedLoop pipeline against the current web-ui. Stage A inventories a design export zip into schema-validated findings (typed design units - screens, regions like nav bars, standalone components like a chat dialog; UX and behavioral changes; Storybook component reuse mapping; token…
verify-findings
Dispatch and collect the finding-verifier fleet at stage23verifyfindings (PLN-722). Reads verifymanifest.json (written by stage22bverifyprepare), spawns one falsify-oriented verifier Task per toverify[] entry with mode-specific Task scheduling (GitHub mode dispatches verifiers synchronously; local mode uses parallel…
artifact-type-tailored-context
Compresses artifacts for judge evaluation. Reads a single raw artifact, applies tiered summarization within a token budget, and returns compacted content with metadata. Isolation via forked context prevents pollution of agent context.
codex-review
Run Codex to review a plan file and return structured feedback with a verdict. Triggers on: debate loop Codex review rounds. Returns VERDICT:APPROVED or VERDICT:NEEDSCHANGES plus CODEXSESSION token.
learning-quality
Structured format for capturing high-quality learnings during ClosedLoop runs.