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/ooiyeefei/ccc/excalidrawnpx skills add ooiyeefei/ccc --skill excalidrawgit clone --depth 1 https://github.com/ooiyeefei/cccWrote 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/ooiyeefei/ccc/excalidraw)<a href="https://agentmods.dev/skills/ooiyeefei/ccc/excalidraw"><img src="https://agentmods.dev/badge/skills/ooiyeefei/ccc/excalidraw.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 | $0.00073 | $0.02184 |
| Opus 5 | $0.00036 | $0.01092 |
| Sonnet 5 | $0.00015 | $0.00437 |
| Haiku 4.5 | $0.00007 | $0.00218 |
Grade A, and why
excalidraw 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 5d 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 — 280 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Excalidraw Diagram Generator
Generate architecture diagrams as .excalidraw files directly from codebase analysis, with optional export to PNG and SVG.
Quick Start
User just asks:
"Generate an architecture diagram for this project"
"Create an excalidraw diagram of the system"
"Visualize this codebase as an excalidraw file"
Claude Code will:
- Analyze the codebase (any language/framework)
- Identify components, services, databases, APIs
- Map relationships and data flows
- Generate valid
.excalidrawJSON with dynamic IDs and labels - Optionally export to PNG and/or SVG using Playwright
No prerequisites: Works without existing diagrams, Terraform, or specific file types.
Critical Rules
1. NEVER Use Diamond Shapes
Diamond arrow connections are broken in raw Excalidraw JSON. Use styled rectangles instead:
| Semantic Meaning | Rectangle Style |
|---|---|
| Orchestrator/Hub | Coral (#ffa8a8/#c92a2a) + strokeWidth: 3 |
| Decision Point | Orange (#ffd8a8/#e8590c) + dashed stroke |
2. Labels Require TWO Elements
The label property does NOT work in raw JSON. Every labeled shape needs:
// 1. Shape with boundElements reference
{
"id": "my-box",
"type": "rectangle",
"boundElements": [{ "type": "text", "id": "my-box-text" }]
}
// 2. Separate text element with containerId
{
"id": "my-box-text",
"type": "text",
"containerId": "my-box",
"text": "My Label"
}
3. Elbow Arrows Need Three Properties
For 90-degree corners (not curved):
{
"type": "arrow",
"roughness": 0, // Clean lines
"roundness": null, // Sharp corners
"elbowed": true // 90-degree mode
}
4. Arrow Edge Calculations
Arrows must start/end at shape edges, not centers:
| Edge | Formula |
|---|---|
| Top | (x + width/2, y) |
| Bottom | (x + width/2, y + height) |
| Left | (x, y + height/2) |
| Right | (x + width, y + height/2) |
What ships with it
7 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.
- 5d ago First seen · 280 lines · 73 tokens per session scan A a5e257e280fd
excalidraw is a skill published in the GitHub repository ooiyeefei/ccc (484 stars, last pushed 1mo ago), licensed MIT. It adds 73 tokens to every session and 2,184 once invoked, about $0.0004 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.
Other skills, from other repositories
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
local-ai-agents
Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
chat-pet-sprite-creation
Use when creating or changing VS Code chat pet sprite art, sprite sheets, state animations, eye treatments, Stable/Insiders variants, or pet transitions under src/vs/workbench/contrib/chat/browser/widget/media/chatPet.
cpu-profile-analysis
Analyze V8/Chrome CPU profiles (.cpuprofile) and DevTools trace files (Trace-.json). Use when: profiling performance, investigating slow functions, comparing code paths, finding bottlenecks, analyzing timeToRequest, understanding call trees from sampling profiler data, analyzing layout/paint/rendering, investigating…
insight-error-page
Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…