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 agentmods add skills/shellydeng08/codebase-slideshow/excalidrawnpx skills add ShellyDeng08/codebase-slideshow --skill excalidrawgit clone --depth 1 https://github.com/ShellyDeng08/codebase-slideshowWhat 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 | $0.00034 | $0.05460 |
| Opus 5 | $0.00017 | $0.02730 |
| Sonnet 5 | $0.00007 | $0.01092 |
| Haiku 4.5 | $0.00003 | $0.00546 |
Grade B, and why
excalidraw-diagram scanned grade B 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 yesterday.
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.
Subtle steeringmediumPrompt injection
Instructions that bias recommendations or shape behaviour without the user noticing.
- **Don't write a Python generator script.** The templating and coordinate math seem helpful but introduce a layer of indirection that makes debugging harder. Hand-crafted JSON with descriptive IDs is more maintainable. This is a copy
91% identical to excalidraw-diagram — 324 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 — 553 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Excalidraw Diagram Creator
Generate .excalidraw JSON files that argue visually, not just display information.
Setup: If the user asks you to set up this skill (renderer, dependencies, etc.), see README.md for instructions.
Customization
All colors and brand-specific styles live in one file: references/color-palette.md. Read it before generating any diagram and use it as the single source of truth for all color choices — shape fills, strokes, text colors, evidence artifact backgrounds, everything.
To make this skill produce diagrams in your own brand style, edit color-palette.md. Everything else in this file is universal design methodology and Excalidraw best practices.
Core Philosophy
Diagrams should ARGUE, not DISPLAY.
A diagram isn't formatted text. It's a visual argument that shows relationships, causality, and flow that words alone can't express. The shape should BE the meaning.
The Isomorphism Test: If you removed all text, would the structure alone communicate the concept? If not, redesign.
The Education Test: Could someone learn something concrete from this diagram, or does it just label boxes? A good diagram teaches—it shows actual formats, real event names, concrete examples.
Depth Assessment (Do This First)
Before designing, determine what level of detail this diagram needs:
Simple/Conceptual Diagrams
Use abstract shapes when:
- Explaining a mental model or philosophy
- The audience doesn't need technical specifics
- The concept IS the abstraction (e.g., "separation of concerns")
Comprehensive/Technical Diagrams
Use concrete examples when:
- Diagramming a real system, protocol, or architecture
- The diagram will be used to teach or explain (e.g., YouTube video)
- The audience needs to understand what things actually look like
- You're showing how multiple technologies integrate
For technical diagrams, you MUST include evidence artifacts (see below).
Research Mandate (For Technical Diagrams)
What ships with it
6 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.
- yesterday First seen · 553 lines · 34 tokens per session scan B febfa71b6147
excalidraw-diagram is a skill published in the GitHub repository ShellyDeng08/codebase-slideshow (2 stars, last pushed 5mo ago), licensed MIT. It adds 34 tokens to every session and 5,460 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (subtle steering). It is 91% identical to excalidraw-diagram, differing in 324 lines, and is treated as a copy.
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