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.
npx skills add christopherarter/superpowers-reasonix --skill superpowers-writing-skillsgit clone --depth 1 https://github.com/christopherarter/superpowers-reasonixWrote 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/christopherarter/superpowers-reasonix/superpowers-writing-skills)<a href="https://agentmods.dev/skills/christopherarter/superpowers-reasonix/superpowers-writing-skills"><img src="https://agentmods.dev/badge/skills/christopherarter/superpowers-reasonix/superpowers-writing-skills/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/christopherarter/superpowers-reasonix/superpowers-writing-skills"><img src="https://agentmods.dev/badge/skills/christopherarter/superpowers-reasonix/superpowers-writing-skills.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, 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 10 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.
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 | $0.00025 | $0.02760 |
| Opus 5.5 | $0.00010 | $0.01104 |
| Sonnet 5.5 | $0.00005 | $0.00552 |
| Haiku 4.5 | $0.00003 | $0.00276 |
Grade A, and why
superpowers-writing-skills 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 26d 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 — 165 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing Skills (for Reasonix)
Overview
Writing skills IS TDD for process docs. Write test cases (pressure scenarios, subagents). Watch fail (baseline). Write skill. Watch pass (agent complies). Refactor (close loopholes).
Core principle: Didn't watch an agent fail without the skill? Don't know it teaches the right thing.
REQUIRED BACKGROUND: Know superpowers-test-driven-development first — defines RED-GREEN-REFACTOR. This adapts it to docs.
Platform spec: Full Reasonix skill/hook/MCP contract → extending-reasonix. This = authoring discipline; that = exhaustive spec.
What is a Skill?
Reusable playbook the model invokes via run_skill (user: /name); read_only_skill loads it in read-only sessions. Two kinds:
- Inline — body folds into the turn as a tool result. Default.
- Subagent (
runAs: subagent) — body = a child's system prompt; runs isolated, returns only its final answer. Use only when work is context-heavy and only the conclusion matters.
ARE: reusable techniques, patterns, tools, reference guides. NOT: narratives of solving something once.
Reasonix Skill Anatomy (get these right)
Where skills live & how found
- Discovery roots, highest priority first: project
{.reasonix,.agents,.agent,.claude}/skills/→[skills] pathsinreasonix.toml→ home~/{.reasonix,...}/skills/→ built-ins. - First match by name wins (user
reviewoverrides built-in). Layout:<root>/skills/<name>/SKILL.md; flat<name>.mdworks too.
Name
Regex: ^[a-zA-Z0-9][a-zA-Z0-9._-]{0,63}$ — letters/digits/./_/-, ≤64 chars, alphanumeric start. Frontmatter name: overrides the dir stem.
Frontmatter — YAML, with Reasonix compatibility flattening
---opens, next---closes. Unclosed fence → WHOLE file is the body (no frontmatter). Always close it.- YAML is parsed with
yaml.v3. Keys are lowercased (runAs=runas), scalar values become strings, sequences are comma-joined, and nested mappings are flattened to their child keys for legacy consumers. Block scalars (>/|) work. Invalid YAML yields an empty frontmatter map, so validate the file after editing.
What ships with it
1 file 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.
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.
- 26d ago Changed · -1 lines 75401229d112
- 2mo ago First seen · 166 lines · 25 tokens per session scan A c7d98818e23f
superpowers-writing-skills is a skill published in the GitHub repository christopherarter/superpowers-reasonix (102 stars, last pushed 26d ago), licensed MIT. It adds 25 tokens to every session and 2,760 once invoked, about $0.0001 per session on Opus 5.5. 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.
superpowers-writing-skills compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| superpowers-writing-skillschristopherarter/superpowers-reasonix | Skill | 102 | 26d ago | MIT | A | 25 | Claude Code, Codex |
| clawhuboujingzhou/openmozi | Skill | 189 | 8d ago | Apache-2.0 | A | 14 | Claude Code, Codex |
| web-ui-motioncreativedswork/dscode | Skill | 11 | 1mo ago | MIT | A | 152 | Claude Code, Codex |
| openspec-proposecreativedswork/dscode | Skill | 11 | 1mo ago | MIT | A | 32 | Claude Code, Codex |
| prototype-workflowcreativedswork/dscode | Skill | 11 | 1mo ago | MIT | A | 34 | Claude Code, Codex |
| dsh-plugin-devzimodzh/dsh-plugin-dev-skills | Skill | 16 | 2mo ago | MIT | A | 156 | Claude Code, Codex |
| html-outputcreativedswork/dscode | Skill | 11 | 1mo ago | MIT | A | 0 | Claude Code, Codex |