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excalidraw-diagram

excalidraw-diagram is a skill for Claude Code from isatimur/excalidraw-skill-pack. It costs 205 tokens per session (7,333 once invoked), scanned A, original, MIT.

A tool for creating editable Excalidraw diagrams, including flowcharts, architecture drawings, timelines, and data flows.

In plain words
What is it for?
Use it to make diagrams that explain software architecture, sequences, states, databases, processes, organizational structures, or before-and-after changes.
Why use it?
It helps turn complex systems or processes into diagrams that can be edited, rendered, and reviewed visually.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the excalidraw-skill-pack plugin — 2 skills shipped together

not rated 4repo today A scan SkillSpector: warn 205 tokens original MIT

Good fit Use it to make diagrams that explain software architecture, sequences, states, databases, processes, organizational structures, or before-and-after changes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/isatimur/excalidraw-skill-pack/core
View source ↗ isatimur/excalidraw-skill-pack excalidraw-skill-pack.vercel.app
Install

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.

Any agent
npx skills add isatimur/excalidraw-skill-pack --skill core
Clone the repo
git clone --depth 1 https://github.com/isatimur/excalidraw-skill-pack

Made for: Claude Code.

Or install excalidraw-skill-pack, the plugin that ships this one along with the rest of its 2 skills.

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.

agentmods badge for excalidraw-diagram

README.md
[![agentmods](https://agentmods.dev/badge/skills/isatimur/excalidraw-skill-pack/core.svg)](https://agentmods.dev/skills/isatimur/excalidraw-skill-pack/core)
Your own site
<a href="https://agentmods.dev/skills/isatimur/excalidraw-skill-pack/core"><img src="https://agentmods.dev/badge/skills/isatimur/excalidraw-skill-pack/core.svg" alt="Measured on agentmods" height="20"></a>
Per session 205 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,333 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 5 findings, 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 Anti-Refusal · line 482
    Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.
    Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.
  • medium Rogue Agent · line 3
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
  • medium MCP Rug Pull · line 55
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 432
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 488
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00205 $0.07333
Opus 5 $0.00102 $0.03667
Sonnet 5 $0.00041 $0.01467
Haiku 4.5 $0.00020 $0.00733

Measured 8d ago against content hash 9bef7cb255fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

excalidraw-diagram 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 8d ago.

The scan reads SKILL.md. This mod also ships 6 executable files (src/index.ts, src/theme-loader.ts, src/validate-theme.ts, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

packages/core/SKILL.md · 540 lines

How it starts

The opening of the file, as written. The whole thing — 540 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.

Editable forever. Themeable. Renderable to PNG. Open in Excalidraw, Obsidian, or VS Code. Twenty-nine typed layouts with progressive disclosure, a first-run brand gate, a taste gate that deletes until the argument is sharp, and a mandatory render-inspect loop — so the diagram is never “done” until it looks right.

Setup: If the user asks you to set up this skill (renderer, dependencies, etc.), use the installed adapter docs or the project README.

0. First-run theme gate

Before generating the first diagram in a new project, verify the theme is intentional.

Resolve the active theme (--theme → project .excalidraw-skill-pack.json → ~/.excalidraw-skill-pack/config.json → default-sketchy). If the project still rides the bundled default and the user has a brand, pause and ask:

"This project is still on default-sketchy. Customize the theme to match your brand first? (a) pull from a website URL, (b) extract from an installed skill, (c) extract from a local design-token folder, (d) paste tokens manually, (e) proceed with the default for now."

Then follow references/onboarding.md. Once onboarded (project config points at a theme, or the user explicitly chose default), skip this gate.

Don't silently ship default-skinned diagrams into a branded project.

Output Contract

When you create or edit a diagram:

  1. Produce a valid .excalidraw / excalidraw-skeleton / mermaid document, not a prose-only answer.
  2. Prefer skeleton format while drafting; hydrate to a full .excalidraw for the shareable deliverable.
  3. If the user names an output path, write there. Otherwise use ./diagram.excalidraw.
  4. Prefer the active theme for all color, typography, element, and layout decisions — read its palette.md before drawing.
  5. Pick a diagram type from references/types/index.md and load that type's reference before generating elements.
  6. Run the taste gate in references/taste-gate.md before declaring done.
  7. Render and inspect the PNG. Fix visible defects. Loop until it passes.
  8. In the final response, report the .excalidraw path, rendered image path if created, theme used, type used, and any validation caveats.

Read the full file on GitHub · 540 lines

Files

What ships with it

60 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.

Changes

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.

  1. 8d ago First seen · 540 lines · 205 tokens per session scan A 9bef7cb255fd

Subscribe to this mod's changes

excalidraw-diagram is a skill published in the GitHub repository isatimur/excalidraw-skill-pack (4 stars, last pushed today), licensed MIT. It adds 205 tokens to every session and 7,333 once invoked, about $0.0010 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 2026-08-31.

Claude CodeDesign and UXai-agentscursordiagram-as-codediagramsexcalidraw
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