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/prillcode/storyline/create-plansnpx skills add prillcode/storyline --skill create-plansgit clone --depth 1 https://github.com/prillcode/storylineWhat 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 | $0.00057 | $0.04396 |
| Opus 5 | $0.00028 | $0.02198 |
| Sonnet 5 | $0.00011 | $0.00879 |
| Haiku 4.5 | $0.00006 | $0.00440 |
Grade B, and why
create-plans scanned grade B 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 yesterday.
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.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
ls ~/.claude/skills/expertise/ 2>/dev/null The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
31 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.
- README.md 9.7 KB
- references/checkpoints.md 20 KB
- references/cli-automation.md 17 KB
- references/context-management.md 3.7 KB
- references/domain-expertise.md 5.0 KB
- references/git-integration.md 2.2 KB
- references/hierarchy-rules.md 4.0 KB
- references/milestone-management.md 13 KB
- references/plan-format.md 12 KB
- references/research-pitfalls.md 7.3 KB
- references/scope-estimation.md 12 KB
- references/user-gates.md 2.2 KB
- templates/brief.md 3.4 KB
- templates/continue-here.md 1.8 KB
- templates/issues.md 3.5 KB
- templates/milestone.md 3.0 KB
- templates/phase-prompt.md 6.7 KB
- templates/research-prompt.md 6.8 KB
- templates/roadmap.md 4.8 KB
- templates/summary.md 4.5 KB
- workflows/complete-milestone.md 8.5 KB
- workflows/create-brief.md 2.3 KB
- workflows/create-roadmap.md 3.5 KB
- workflows/execute-phase.md 31 KB
- workflows/get-guidance.md 2.0 KB
- workflows/handoff.md 3.2 KB
- workflows/plan-chunk.md 1.5 KB
- workflows/plan-phase.md 9.9 KB
- workflows/research-phase.md 2.7 KB
- workflows/resume.md 2.6 KB
- workflows/transition.md 3.7 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.
- yesterday First seen · 489 lines · 57 tokens per session scan B c0adb5d8a791
create-plans is a skill published in the GitHub repository prillcode/storyline (2 stars, last pushed 7mo ago), with no licence file. It adds 57 tokens to every session and 4,396 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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