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 zzmkxd/excalidraw-mcp-obsidian --skill excalidraw-edit-skillgit clone --depth 1 https://github.com/zzmkxd/excalidraw-mcp-obsidianWrote 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/zzmkxd/excalidraw-mcp-obsidian/excalidraw-edit-skill)<a href="https://agentmods.dev/skills/zzmkxd/excalidraw-mcp-obsidian/excalidraw-edit-skill"><img src="https://agentmods.dev/badge/skills/zzmkxd/excalidraw-mcp-obsidian/excalidraw-edit-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/zzmkxd/excalidraw-mcp-obsidian/excalidraw-edit-skill"><img src="https://agentmods.dev/badge/skills/zzmkxd/excalidraw-mcp-obsidian/excalidraw-edit-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 | $0.00132 | $0.02524 |
| Opus 5.5 | $0.00053 | $0.01010 |
| Sonnet 5.5 | $0.00026 | $0.00505 |
| Haiku 4.5 | $0.00013 | $0.00252 |
Grade A, and why
excalidraw-edit-skill 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 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.
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 — 295 lines — stays where its author put it; the contents beside it link to each section on GitHub.
LOCAL FORK (MCP-only)
本工作区无 browser canvas / WebSocket / 截图。选中走 Obsidian EA「AI Edit Selected」→.ai-selection.json→get_selection；改图前先import_from_obsidian。下文 canvas/screenshot 叙事过时，勿照抄；以仓库根DOCS_*.md/CLAUDE.md为准。
Excalidraw Editing Skill
What This Skill Does
The excalidraw-skill creates diagrams. This skill edits them.
When the user clicks an element on the canvas, the browser computes rendering-level data (text overflow, overlaps, nearby elements) and pushes it to the server. This skill uses that structured data for precision editing — no guesswork about pixel coordinates, no pure screenshot analysis.
Tool Selection Guide
| You want to... | Use this tool |
|---|---|
| Inspect what the user just clicked | get_selection |
| Check a specific element by ID | get_element_context(id) |
| See the whole canvas layout | describe_scene |
| Visually verify a change | get_canvas_screenshot |
| Modify one element | update_element |
| Move/resize multiple elements | Multiple update_element calls |
| Fix layout spacing | distribute_elements or align_elements |
| Element is locked | unlock_elements first |
| Safety net before risky change | snapshot_scene |
| Undo a bad change | restore_snapshot |
Decision tree for gathering context:
User clicked something in the canvas?
→ get_selection
→ Check hasSelection:
true → Analyze structured data, proceed to editing
false → "你没有选中任何元素。请点击画布上的某个元素让我帮你检查。"
Need to check another element nearby?
→ get_element_context(id)
Need the full picture?
→ describe_scene + get_canvas_screenshot
Quality Checklist (Automated via Structured Data)
After get_selection, run these four checks against the structured data. The browser already computed the numbers — you just read them.
1. Text Overflow
Read elements[].renderedOverflow:
{
"renderedOverflow": {
"overflow": true,
"textRenderedWidth": 342,
"containerWidth": 60
}
}
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 · 295 lines · 132 tokens per session scan A 5ede24280301
excalidraw-edit-skill is a skill published in the GitHub repository zzmkxd/excalidraw-mcp-obsidian (0 stars, last pushed 2mo ago), licensed MIT. It adds 132 tokens to every session and 2,524 once invoked, about $0.0005 per session on Opus 5.5. 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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