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excalidraw-drawing-accuracy

excalidraw-drawing-accuracy is a skill for Claude Code, Codex from Scofieldfree/excalidraw-mcp. It costs 47 tokens per session (438 once invoked), scanned A, original, MIT.

A guided workflow for creating Excalidraw diagrams, including diagrams written in Mermaid, a text-based diagram format. It starts and checks the drawing session and applies a default visual style when none is requested.

In plain words
What is it for?
Use it to create, edit, and check diagrams from Mermaid input or manually supplied elements.
Why use it?
It reduces inconsistent results and mistakes caused by using the wrong drawing method, writing too much at once, or skipping verification.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 102repo 9mo ago A scan 47 tokens original MIT

Good fit Use it to create, edit, and check diagrams from Mermaid input or manually supplied elements.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/scofieldfree/excalidraw-mcp/excalidraw-drawing-accuracy
View source ↗ Scofieldfree/excalidraw-mcp
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 Scofieldfree/excalidraw-mcp --skill excalidraw-drawing-accuracy
Clone the repo
git clone --depth 1 https://github.com/Scofieldfree/excalidraw-mcp

Made for: Claude Code, Codex.

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-drawing-accuracy

README.md
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Your own site
<a href="https://agentmods.dev/skills/scofieldfree/excalidraw-mcp/excalidraw-drawing-accuracy"><img src="https://agentmods.dev/badge/skills/scofieldfree/excalidraw-mcp/excalidraw-drawing-accuracy/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.

agentmods 80×15 button for excalidraw-drawing-accuracy

Your own site · 80×15
<a href="https://agentmods.dev/skills/scofieldfree/excalidraw-mcp/excalidraw-drawing-accuracy"><img src="https://agentmods.dev/badge/skills/scofieldfree/excalidraw-mcp/excalidraw-drawing-accuracy.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 438 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.
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 $0.00047 $0.00438
Opus 5.5 $0.00019 $0.00175
Sonnet 5.5 $0.00009 $0.00088
Haiku 4.5 $0.00005 $0.00044

Measured 2mo ago against content hash b7ac30043ea8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

excalidraw-drawing-accuracy 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 2mo 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.

packages/skills/excalidraw-drawing-accuracy/SKILL.md · 69 lines

What it actually says

Excalidraw Drawing (Minimal)

Use this skill for fast, stable diagram output with minimal process overhead.

Source of truth: this file is the primary definition.

Tools

  • start_session
  • create_from_mermaid
  • add_elements
  • update_element
  • get_scene

Rules

  1. Always call start_session first for the target sessionId.
  2. Strategy routing:
  • Mermaid input (```mermaid block or Mermaid DSL) -> create_from_mermaid
  • Non-Mermaid input -> add_elements / update_element
  1. Use segmented writes for medium/large diagrams (2-4 batches).
  2. Prefer updating by id.

Default Style

When user does not specify style, use Ghibli:

  • Primary: #f0f9ff / #0369a1
  • Secondary: #f7fee7 / #365314
  • Accent: #fff7ed / #9a3412
  • Shared: fillStyle: "hachure", roughness: 2, roundness: { "type": 3 }

If user specifies style, follow user style.

Workflow

  1. start_session(sessionId)
  2. First render:
  • Mermaid -> create_from_mermaid
  • Manual -> add_elements (segmented)
  1. Quick polish with update_element
  2. Verify with get_scene

Quick Verification

  • get_scene succeeds
  • key nodes/edges exist
  • labels are readable on core nodes
  • no obvious broken connector on core flow

If checks fail, fix only the affected region and re-check.

Completion Output

Report:

  1. sessionId
  2. created/updated ids
  3. verification pass/fail
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. 2mo ago First seen · 69 lines · 47 tokens per session scan A b7ac30043ea8

Subscribe to this mod's changes

excalidraw-drawing-accuracy is a skill published in the GitHub repository Scofieldfree/excalidraw-mcp (102 stars, last pushed 9mo ago), licensed MIT. It adds 47 tokens to every session and 438 once invoked, about $0.0002 per session on Opus 5.5. 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.

Design and UX
Related

excalidraw-drawing-accuracy compared with skills from other repositories

excalidraw-drawing-accuracy next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
excalidraw-drawing-accuracyScofieldfree/excalidraw-mcpSkill1029mo agoMITA47Claude Code, Codex
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visual-ralphYeachan-Heo/oh-my-codexSkill34k3d agoMITA52Codex
glance-canonical-layoutsandroid/skillsSkill10kyesterdayApache-2.0A56Claude Code
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