Getting it into your agent
There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.
Wrote 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/sammcj/agentic-coding/excalidraw-diagrams)<a href="https://agentmods.dev/skills/sammcj/agentic-coding/excalidraw-diagrams"><img src="https://agentmods.dev/badge/skills/sammcj/agentic-coding/excalidraw-diagrams.svg" alt="Measured on agentmods" 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 | $0.00030 | $0.01739 |
| Opus 5 | $0.00015 | $0.00870 |
| Sonnet 5 | $0.00006 | $0.00348 |
| Haiku 4.5 | $0.00003 | $0.00174 |
Grade A, and why
excalidraw-diagrams 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 4d 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 — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating Excalidraw Diagrams
When creating Excalidraw diagrams, ensure you:
- Generate the layout with correct spacing
- Make consistent and logical use of colours, fonts, and shapes
- Text is correctly added within shapes, not as separate text elements (unless desired)
- Arrows and lines are correctly anchored / connected to shapes (not floating) so that when objects are moved any connections remain intact
- You save the Excalidraw diagram content to a file and link the file path
- Call
read_mebefore your firstcreate_viewcall each session - it provides the colour palette, camera sizes, layout rules, and element format reference. - If the user has asked you to create Excalidraw diagrams but you do not have the Excalidraw MCP enabled, you should ask them to add it for you, they can configured it by using the HTTP MCP URL of: https://excalidraw-mcp-app.vercel.app/mcp and they can view the MCP documentation here: https://github.com/excalidraw/excalidraw-mcp
Choose your workflow
Pick one based on what the user needs. Do not default to doing both.
Inline preview only (create_view)
Use when the diagram is for the conversation only - the user wants to see it in the chat and does not need a file.
- Use
create_viewwithlabelon shapes (works fine here) - Use
cameraUpdateto animate and guide attention - No file output needed
File output only (Python script)
Use when the user needs a .excalidraw file to open, share, edit, or keep. Skip create_view entirely.
- Generate the file with
scripts/generate_excalidraw.py(see below) - Provide the file path to the user
- Files can be opened by dragging into excalidraw.com, the Excalidraw desktop app, or VS Code with the Excalidraw extension
Both (inline preview + file)
Use when the user wants to see the diagram in the chat AND keep a file. Note: these are built independently with different element formats. There is no data bridge between them - you define the diagram structure once conceptually but render it twice.
What ships with it
2 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.
- 4d ago Changed · +2 lines ccd2663996d9
- 8d ago First seen · 115 lines · 30 tokens per session scan A 352d83ec33f9
excalidraw-diagrams is a skill published in the GitHub repository sammcj/agentic-coding (160 stars, last pushed today), licensed Apache-2.0. It adds 30 tokens to every session and 1,739 once invoked, about $0.0002 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 2026-08-30.
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