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/magicpatterns/agent-plugins/prototypenpx skills add magicpatterns/agent-plugins --skill prototypegit clone --depth 1 https://github.com/magicpatterns/agent-pluginsWhat 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 | $0.00096 | $0.01718 |
| Opus 5 | $0.00048 | $0.00859 |
| Sonnet 5 | $0.00019 | $0.00344 |
| Haiku 4.5 | $0.00010 | $0.00172 |
Grade A, and why
prototype 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 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.
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 — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Prototype an idea in Magic Patterns
Use this skill when the user has an idea they want to prototype and wants it grounded in the UI they already have. It seeds a Magic Patterns design from the relevant local UI, then prompts Magic Patterns to design the idea, hands back the editor link, and opens it in the browser.
It composes two mechanisms, used in order, for different jobs — not interchangeably:
- Seed (deterministic): recreate the relevant existing local UI with
recreate-as-reactand write it into a blank design (theupload-to-magic-patternsflow). This recreates what already exists — it does NOT build the new idea. - Prototype the idea (creative): once seeded and published, use
send_promptto let Magic Patterns design the net-new idea. This is where the prototyping happens — let Magic Patterns do the creative heavy lifting; don't hand-build it.
Direct file writes after seeding are reserved for precise, deterministic tweaks (rename a label, swap a color, port one specific local component) — never for generating the new concept.
Magic Patterns renders visual prototypes, not production apps — local code must be ported to its constraints (handled by recreate-as-react; see upload-to-magic-patterns).
Prerequisites
- The Magic Patterns MCP server must be connected (tools prefixed
magic-patterns). If the tools are unavailable, tell the user to install/enable the Magic Patterns plugin or MCP server, and stop. - Magic Patterns MCP usage requires a paid plan. A
Payment Required/ credits error means the user must upgrade atmagicpatterns.com/settings.
When to use
-
This skill (
prototype): the user wants to prototype or evolve an idea grounded in their existing UI, and iterate on it. -
upload-to-magic-patterns: just mirror local UI into a hosted design, no iteration. -
integrate-magic-patterns-design: bring a Magic Patterns design back into the codebase as production code.
Links: always hand back the editor link
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 · 94 lines · 96 tokens per session scan A 631744b43ed0
prototype is a skill published in the GitHub repository magicpatterns/agent-plugins (0 stars, last pushed 27d ago), licensed MIT. It adds 96 tokens to every session and 1,718 once invoked, about $0.0005 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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