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/zalom/plastic/tutorialnpx skills add zalom/plastic --skill tutorialgit clone --depth 1 https://github.com/zalom/plasticWhat 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 | $0.00089 | $0.00790 |
| Opus 5 | $0.00044 | $0.00395 |
| Sonnet 5 | $0.00018 | $0.00158 |
| Haiku 4.5 | $0.00009 | $0.00079 |
Grade A, and why
plastic-tutorial 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 3d 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 — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plastic Tutorial
An interactive coach, not an automator. It walks one of three tracks, one step at a time, and keeps no state of its own: the intent being used for the walkthrough is the progress bar.
The three tracks
This is the one menu in the whole skill. Offer it, then route into the picked track's reference. Every checkpoint inside a track is prose, never another menu.
- Guided: deliver a first intent, stage by stage, approving each step yourself. Routes to
references/track-1-guided.md. - Auto: hand delivery to the agent and watch the gates and reports as it works. Routes to
references/track-2-auto.md. - Projects and roadmaps: grow a founding intent into a small real project, add more
intents, and plan a delivery batch with a roadmap. Routes to
references/track-3-projects-and-roadmaps.md.
If the user names what they want instead of picking a number ("show me auto mode", "I want a roadmap", "walk me through my first intent"), route straight to the matching track without showing the menu again.
The coach contract
Narrate one step at a time: say what the next station does, then hand control back so the user types the real command themselves. After they run it, look at what appeared (a file, a gate message, a report) and debrief in plain words before moving to the next station. Never run a station's command on the user's behalf; the tutorial teaches the shape of the work, it does not do the work.
Keep no new state. The intent's own lifecycle stage and savepoint are the only progress record. This skill never writes a "tutorial progress" file of its own.
The resume rule
To pause, the user says "continue the tutorial." Read the walkthrough intent's current stage and savepoint (for track 3, check which project-scaffolding steps are already on disk) and resume at the matching station. Do not restart from station one, and do not ask the user to remember where they left off.
Routing table
| Trigger | Reference |
|---|---|
| User picks "guided", or names their first intent, a first delivery, or learning the stages one at a time | references/track-1-guided.md |
| User picks "auto", or says "hand it to the agent", "run the whole thing", "show me auto mode" | references/track-2-auto.md |
| User picks "projects and roadmaps", or says "start a project", "I want a roadmap", "plan a batch of work" | references/track-3-projects-and-roadmaps.md |
What ships with it
4 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.
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.
- 3d ago First seen · 66 lines · 89 tokens per session scan A a15c66ed76b4
plastic-tutorial is a skill published in the GitHub repository zalom/plastic (10 stars, last pushed 3d ago), licensed MIT. It adds 89 tokens to every session and 790 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 2026-08-31.
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