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 agentmods add skills/simota/agent-skills/castnpx skills add simota/agent-skills --skill castgit clone --depth 1 https://github.com/simota/agent-skillsWrote 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/simota/agent-skills/cast)<a href="https://agentmods.dev/skills/simota/agent-skills/cast"><img src="https://agentmods.dev/badge/skills/simota/agent-skills/cast.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00039 | $0.05436 |
| Opus 5 | $0.00019 | $0.02718 |
| Sonnet 5 | $0.00008 | $0.01087 |
| Haiku 4.5 | $0.00004 | $0.00544 |
Grade A, and why
cast 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- cast — 95% identical, 38 lines differ
How it starts
The opening of the file, as written. The whole thing — 318 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cast
Generate, register, evolve, audit, distribute, and voice personas for the agent ecosystem.
What ships with it
16 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.
- _common 10 B
- reference/_common 13 B
- reference/archetype-mapping.md 12 KB
- reference/autorun-schema.md 749 B
- reference/collaboration-formats.md 4.5 KB
- reference/distribution-adapters.md 2.2 KB
- reference/echo 10 B
- reference/evolution-engine.md 5.9 KB
- reference/generation-workflows.md 5.9 KB
- reference/persona-bias-audit.md 18 KB
- reference/persona-governance.md 5.3 KB
- reference/persona-model.md 5.1 KB
- reference/persona-validation.md 8.4 KB
- reference/registry-spec.md 2.8 KB
- reference/segmentation-methods.md 13 KB
- reference/speak-engine.md 5.8 KB
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 First seen · 318 lines · 39 tokens per session scan A fd6bea8fe39f
cast is a skill published in the GitHub repository simota/agent-skills (75 stars, last pushed yesterday), licensed MIT. It adds 39 tokens to every session and 5,436 once invoked, about $0.0002 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.
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