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 human-avatar/skills-for-humanity --skill s4h-writing-arc-designgit clone --depth 1 https://github.com/human-avatar/skills-for-humanityWrote 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/human-avatar/skills-for-humanity/s4h-writing-arc-design)<a href="https://agentmods.dev/skills/human-avatar/skills-for-humanity/s4h-writing-arc-design"><img src="https://agentmods.dev/badge/skills/human-avatar/skills-for-humanity/s4h-writing-arc-design/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/human-avatar/skills-for-humanity/s4h-writing-arc-design"><img src="https://agentmods.dev/badge/skills/human-avatar/skills-for-humanity/s4h-writing-arc-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00088 | $0.01735 |
| Opus 5 | $0.00044 | $0.00868 |
| Sonnet 5 | $0.00018 | $0.00347 |
| Haiku 4.5 | $0.00009 | $0.00173 |
Grade A, and why
s4h-writing-arc-design 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 9d 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 — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing: Arc Design
Arcs feel unearned when the external plot and internal change are independent — when the character changes because the story requires it, not because the events forced it. This is the most common arc failure, and it produces the most visceral reader response: "the character just suddenly becomes a different person." The reader is right. The change happened on a schedule, not as a consequence.
The fundamental principle: the external must create the conditions for the internal. The plot does not just happen alongside the character — it acts on the character in ways that make the internal change not just possible but necessary. The protagonist's wound must be pressed on, repeatedly, by the specific events of the plot. The defence must be made untenable by the story's demands. The arc endpoint is not the character deciding to change — it is the character having no remaining option except to change, or to break.
The ending is not the change. The ending is the consequence of the change. This distinction matters enormously: if the character's internal shift and the external resolution happen simultaneously, the causation is lost. The internal shift must precede the external resolution, making it possible. The reader needs to see the new belief or new capacity tested against the story's central problem — and the test must require exactly what the old self couldn't have provided.
Your Process
Step 1: Start State What is the character's belief, wound, and worldview at the story's opening? Be specific: not "she is closed off" but "she believes that needing people is weakness — a belief installed by her mother's abandonment when she was nine, which she has managed by becoming self-sufficient to a degree that reads as coldness." The start state must be specific enough to be testable: you should be able to ask of any scene "is this character acting from their opening belief?" and get a clear answer.
Framing check: Confirm the specific character and arc before continuing. State what you've identified — the character being analyzed, their apparent wound or core belief, and the arc endpoint as you understand it — in one sentence, then use AskUserQuestion:
- Question: "I'm reading this as: [your one-sentence framing of the character, their wound/starting belief, and the arc being examined]. Is that right?"
- Header: "Framing"
- Options:
- Yes — proceed — framing is correct
- Adjust — one element is off; user will correct it before you continue
- Reframe — different situation than read; incorporate the correction before proceeding
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.
- 9d ago First seen · 107 lines · 88 tokens per session scan A 04ae10fd3709
s4h-writing-arc-design is a skill published in the GitHub repository human-avatar/skills-for-humanity (223 stars, last pushed 1mo ago), licensed MIT. It adds 88 tokens to every session and 1,735 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 2026-09-03.
Other skills, from other repositories
decision-making-under-pressure
Provides practical habits for making better decisions faster -- reframing problems before solving them, knowing when to stop deliberating, balancing intuition with analysis, resisting 'just this once' compromises, and breaking overthinking cycles. Use when facing a high-stakes choice with incomplete data, sensing that…
flow-state
Optimizes individual and team productivity using Csikszentmihalyi's flow state framework, covering the conditions for flow (clear goals, immediate feedback, challenge-skill balance), the four-stage flow cycle, and organizational flow design. Use when auditing personal or team focus time, diagnosing productivity loss…
stoic-right-action
Applies Stoic ethics of right action to entrepreneurial decision-making, covering the four cardinal virtues (courage, justice, temperance, wisdom), ethical leadership under pressure, and the discipline of choosing the harder right over the easier wrong. Use when facing ethical dilemmas in business, building a…
bakeoff
Turn one decision into a judged tournament of solutions, then pick the best. Given a problem, design choice, or a suggestion you want cross-verified, it generates diverse candidate solutions, auto-derives the evaluation dimensions for THAT problem (so you don't have to know what to score on), judges every candidate…
balanced-scorecard
Translate strategy into metrics across Financial, Customer, Internal Process, and Learning & Growth perspectives.
customer-journey-map
Visualize every touchpoint a customer has with a product or service — stages, actions, emotions, pain points, opportunities.