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 valeriyproklov/excalidraw-zephy --skill excalidraw-skillgit clone --depth 1 https://github.com/valeriyproklov/excalidraw-zephyWrote 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/valeriyproklov/excalidraw-zephy/excalidraw-skill)<a href="https://agentmods.dev/skills/valeriyproklov/excalidraw-zephy/excalidraw-skill"><img src="https://agentmods.dev/badge/skills/valeriyproklov/excalidraw-zephy/excalidraw-skill/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/valeriyproklov/excalidraw-zephy/excalidraw-skill"><img src="https://agentmods.dev/badge/skills/valeriyproklov/excalidraw-zephy/excalidraw-skill.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 | $0.00154 | $0.04503 |
| Opus 5 | $0.00077 | $0.02252 |
| Sonnet 5 | $0.00031 | $0.00901 |
| Haiku 4.5 | $0.00015 | $0.00450 |
Grade A, and why
excalidraw-skill scanned grade A 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 11d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
2. Optional: `curl -X DELETE http://127.0.0.1:3000/api/elements/clear` This is a copy
91% identical to excalidraw-skill — 13 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 305 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Excalidraw Skill
Step 0: Determine Connection Mode
Two modes are available. Try MCP first — it has more capabilities.
MCP mode (preferred): If excalidraw/batch_create_elements and other excalidraw/* tools appear in your tool list, use them directly. MCP tools handle label and arrow binding format automatically. When the user provides a Zephy room URL, call set_room with that URL first, or pass roomUrl/roomId directly to each canvas tool.
REST API mode (fallback): If MCP tools aren't available, use HTTP endpoints at http://127.0.0.1:3000. See the cheatsheet for REST payloads. Note the format differences in the table below — REST and MCP accept slightly different field names.
Neither works? Tell the user:
The Excalidraw canvas server is not running. To set up:
git clone https://github.com/yctimlin/mcp_excalidraw && cd mcp_excalidrawnpm ci && npm run buildPORT=3000 npm run canvas- Open
http://127.0.0.1:3000in a browser- (Recommended) Install the MCP server:
claude mcp add excalidraw -s user -e EXPRESS_SERVER_URL=http://127.0.0.1:3000 -- node /path/to/mcp_excalidraw/dist/index.js
MCP vs REST API Quick Reference
| Operation | MCP Tool | REST API Equivalent |
|---|---|---|
| Create elements | batch_create_elements |
POST /api/elements/batch |
| Get all elements | query_elements |
GET /api/elements |
| Get one element | get_element |
GET /api/elements/:id |
| Update element | update_element |
PUT /api/elements/:id |
| Delete element | delete_element |
DELETE /api/elements/:id |
| Clear canvas | clear_canvas |
DELETE /api/elements/clear |
| Describe scene | describe_scene |
GET /api/elements (parse manually) |
| Export scene | export_scene |
GET /api/elements (save to file) |
| Import scene | import_scene |
POST /api/elements/sync |
| Snapshot | snapshot_scene |
POST /api/snapshots |
| Restore snapshot | restore_snapshot |
GET /api/snapshots/:name then clear/batch-create |
| Screenshot | get_canvas_screenshot |
POST /api/export/image (needs browser) |
| Viewport | set_viewport |
POST /api/viewport (needs browser) |
| Export image | export_to_image |
POST /api/export/image (needs browser) |
| Export URL | export_to_excalidraw_url |
Only via MCP |
What ships with it
9 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.
- evals/evals.json 1.7 KB
- references/cheatsheet.md 6.1 KB
- scripts/clear-canvas.cjs 1.0 KB runs code
- scripts/create-element.cjs 1.8 KB runs code
- scripts/delete-element.cjs 1.2 KB runs code
- scripts/export-elements.cjs 1.4 KB runs code
- scripts/healthcheck.cjs 794 B runs code
- scripts/import-elements.cjs 2.5 KB runs code
- scripts/update-element.cjs 2.0 KB runs code
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.
- 11d ago First seen · 305 lines · 154 tokens per session scan A fcbff04d45b9
excalidraw-skill is a skill published in the GitHub repository valeriyproklov/excalidraw-zephy (0 stars, last pushed 2mo ago), licensed MIT. It adds 154 tokens to every session and 4,503 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 91% identical to excalidraw-skill, differing in 13 lines, and is treated as a copy.
Other skills, from other repositories
webgl-holographic-foil
A self-contained WebGL2 hero: thin-film interference over a crushed-foil surface whose palette shifts with the viewing angle; move the cursor to tilt the film.
html-ppt-hermes-cyber-terminal
OpenDesign + BYOK: choosing and wiring your own model, hands-on — cost, quality, and the routing decision. Built as a decision-grade AI literacy deck for engineers, IT, applied-AI teams.
html-ppt-taste-brutalist
16:9 HTML deck in tactical-telemetry / CRT-terminal taste. Deactivated-CRT charcoal slides, white-phosphor monospace, hazard-red accent, scanline overlay, ASCII syntax, density over decoration. Distilled from Leonxlnx/taste-skill brutalist-skill (Tactical Telemetry mode).
visual-ralph
Visual Ralph orchestration for frontend UI from generated references, static references, or live URL targets, using $ultragoal with built-in visual verdict and pixel-diff evidence until the implementation matches and leaves a reproducible design system.
accessibility
Consolidated accessibility skill entrypoint for WCAG 2.2, ARIA Authoring Practices, cognitive accessibility, Section 508, EN 301 549, design intent verification, and the Accessibility Planner workflow.
make-resume
A Chinese-language tool for creating editable HTML resumes that can be changed in a browser and printed to PDF. It uses available resume templates when they are installed and otherwise provides a simpler fallback.