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 iagogfe/excalidraw-icons-mcp --skill excalidraw-skillgit clone --depth 1 https://github.com/iagogfe/excalidraw-icons-mcpWrote 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/iagogfe/excalidraw-icons-mcp/excalidraw-skill)<a href="https://agentmods.dev/skills/iagogfe/excalidraw-icons-mcp/excalidraw-skill"><img src="https://agentmods.dev/badge/skills/iagogfe/excalidraw-icons-mcp/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/iagogfe/excalidraw-icons-mcp/excalidraw-skill"><img src="https://agentmods.dev/badge/skills/iagogfe/excalidraw-icons-mcp/excalidraw-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Tool Misuse · line 33 Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
- high Tool Misuse · line 34 Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
- medium Data Exfiltration · line 162 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.04496 |
| Opus 5.5 | $0.00062 | $0.01798 |
| Sonnet 5.5 | $0.00031 | $0.00899 |
| 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 2mo 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` Copies of this mod
3 near-identical copies found in the catalogue:
- excalidraw-skill — 91% identical, 13 lines differ
- excalidraw-skill — 88% identical, 20 lines differ
- excalidraw-skill — 88% identical, 107 lines differ
How it starts
The opening of the file, as written. The whole thing — 304 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.
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/iagogfe/excalidraw-icons-mcp && cd excalidraw-icons-mcpnpm 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/excalidraw-icons-mcp/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 POST /api/elements/sync |
| 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 6.5 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 2.3 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.
- 2mo ago First seen · 304 lines · 154 tokens per session scan A e1e2fcbf179b
excalidraw-skill is a skill published in the GitHub repository iagogfe/excalidraw-icons-mcp (32 stars, last pushed 1mo ago), licensed MIT. It adds 154 tokens to every session and 4,496 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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