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 sunhome243/figma-mcp-express --skill figma-prototypegit clone --depth 1 https://github.com/sunhome243/figma-mcp-expressWrote 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/sunhome243/figma-mcp-express/figma-prototype)<a href="https://agentmods.dev/skills/sunhome243/figma-mcp-express/figma-prototype"><img src="https://agentmods.dev/badge/skills/sunhome243/figma-mcp-express/figma-prototype/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/sunhome243/figma-mcp-express/figma-prototype"><img src="https://agentmods.dev/badge/skills/sunhome243/figma-mcp-express/figma-prototype.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00053 | $0.00586 |
| Opus 5 | $0.00026 | $0.00293 |
| Sonnet 5 | $0.00011 | $0.00117 |
| Haiku 4.5 | $0.00005 | $0.00059 |
Grade A, and why
figma-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 8d 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 — 42 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Figma Prototype Wiring
Companion domain layer for prototype judgment. It does not redefine MCP execution
rules: use figma-mcp-express for tool discovery, batch syntax, origin/channel,
and validation; use this skill for interaction intent, transition choice, overlay
limits, flow audits, and scroll-fixed behavior.
First Checks
- Figma Desktop open with the plugin running; load the
figma-mcp-expressskill first for tool/batch discipline. - Prototype reactions live on ANY node (buttons, instances), not just frames — and prototypes are per-page.
- Overlay appearance (position/scrim/dismiss) is read-only via the API. You can open an overlay (
navigation:"OVERLAY") but not place or style it — that is configured in the Figma UI on the destination frame.
Workflow
- Scope — given
nodeIds, wire those frames; otherwise use the current page. - Read current state — run
get_prototypefor starts, edges, overlays, and existing reactions. - Analyze frames — use
get_design_contextfor structure andscan_text_nodesfor CTA labels. - Infer only with evidence — require at least two corroborating signals before auto-wiring; flag single-signal guesses.
- Wire — batch
set_reactionsops plusset_prototype_startfor the entry frame. - Choose transitions by similarity — near-identical screens use
SMART_ANIMATE; distinct screens use directionalPUSH; peers useDISSOLVE; overlays useMOVE_IN/MOVE_OUT. - Verify — re-run
get_prototype; flag dead ends, missing back paths, mobile hover triggers, unwired CTAs, and heavy PUSH between same-named frames.
Reference Router
| Need | Read |
|---|---|
| Actions, triggers, transitions, overlays, component variants, flow starts | references/prototype-patterns.md |
| Infer flow from static frames, audit existing prototypes, reaction maps, conservative fixes | references/prototype-audit.md |
| Scrollable frames, sticky headers, pinned tab bars, fixed children | references/prototype-scroll.md |
What ships with it
3 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.
- 8d ago First seen · 42 lines · 53 tokens per session scan A c6c71ec37194
figma-prototype is a skill published in the GitHub repository sunhome243/figma-mcp-express (7 stars, last pushed 28d ago), licensed MIT. It adds 53 tokens to every session and 586 once invoked, about $0.0003 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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