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 PracticalSwan/agent-skills --skill excalidraw-diagram-generatorgit clone --depth 1 https://github.com/PracticalSwan/agent-skillsWrote 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/practicalswan/agent-skills/excalidraw-diagram-generator)<a href="https://agentmods.dev/skills/practicalswan/agent-skills/excalidraw-diagram-generator"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/excalidraw-diagram-generator/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/practicalswan/agent-skills/excalidraw-diagram-generator"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/excalidraw-diagram-generator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, 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 Prompt Injection · line 642 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
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 | $0.00047 | $0.06414 |
| Opus 5 | $0.00023 | $0.03207 |
| Sonnet 5 | $0.00009 | $0.01283 |
| Haiku 4.5 | $0.00005 | $0.00641 |
Grade A, and why
excalidraw-diagram-generator 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 3d 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 — 672 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Excalidraw Diagram Generator
A skill for generating Excalidraw-format diagrams from natural language descriptions. This skill helps create visual representations of processes, systems, relationships, and ideas without manual drawing.
- Leverage native parallel subagent dispatch and 200k+ context windows where available.
Activation Conditions
Use symptom -> action triggers: when one matches, apply this skill and verify with the protocol below.
Use this skill when users request:
- "Create a diagram showing..."
- "Make a flowchart for..."
- "Visualize the process of..."
- "Draw the system architecture of..."
- "Generate a mind map about..."
- "Create an Excalidraw file for..."
- "Show the relationship between..."
- "Diagram the workflow of..."
Supported diagram types:
- 📊 Flowcharts: Sequential processes, workflows, decision trees
- 🔗 Relationship Diagrams: Entity relationships, system components, dependencies
- 🧠 Mind Maps: Concept hierarchies, brainstorming results, topic organization
- 🏗️ Architecture Diagrams: System design, module interactions, data flow
- 📈 Data Flow Diagrams (DFD): Data flow visualization, data transformation processes
- 🏊 Business Flow (Swimlane): Cross-functional workflows, actor-based process flows
- 📦 Class Diagrams: Object-oriented design, class structures and relationships
- 🔄 Sequence Diagrams: Object interactions over time, message flows
- 🗃️ ER Diagrams: Database entity relationships, data models
Prerequisites
- Clear description of what should be visualized
- Identification of key entities, steps, or concepts
- Understanding of relationships or flow between elements
Step-by-Step Workflow
Step 1: Understand the Request
Analyze the user's description to determine:
- Diagram type (flowchart, relationship, mind map, architecture)
- Key elements (entities, steps, concepts)
- Relationships (flow, connections, hierarchy)
- Complexity (number of elements)
What ships with it
16 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.
- CHANGELOG.md 6.4 KB
- LICENSE.txt 1.5 KB
- references/element-types.md 8.5 KB
- references/excalidraw-schema.md 8.2 KB
- scripts/.gitignore 484 B
- scripts/add-arrow.py 9.5 KB runs code
- scripts/add-icon-to-diagram.py 13 KB runs code
- scripts/split-excalidraw-library.py 5.4 KB runs code
- templates/business-flow-swimlane-template.excalidraw 7.6 KB
- templates/class-diagram-template.excalidraw 13 KB
- templates/data-flow-diagram-template.excalidraw 6.3 KB
- templates/er-diagram-template.excalidraw 15 KB
- templates/flowchart-template.excalidraw 4.0 KB
- templates/mindmap-template.excalidraw 5.3 KB
- templates/relationship-template.excalidraw 3.2 KB
- templates/sequence-diagram-template.excalidraw 11 KB
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.
- 3d ago Changed b9e8b732c7be
- 5d ago Changed ff93bb314e3c
- 7d ago Changed f74bc32f5b46
- 11d ago First seen · 672 lines · 47 tokens per session scan A 57ea72e72cdb
excalidraw-diagram-generator is a skill published in the GitHub repository PracticalSwan/agent-skills (14 stars, last pushed 3d ago), licensed MIT. It adds 47 tokens to every session and 6,414 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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