A tool for creating Excalidraw diagrams from short text-based definitions. Excalidraw is a drawing format for simple boxes, arrows, flows, and other visual explanations.

Use it to make flow diagrams, process maps, architecture sketches, and other box-and-arrow visuals, then render them as PNG images.

It avoids manually positioning diagram elements and can check for overlaps, crowded labels, and layout problems.

excalidraw — Skill for Claude Code by marsmike

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 marsmike/feinschmiede --skill excalidraw

Clone the repo

git clone --depth 1 https://github.com/marsmike/feinschmiede

Made for: Claude Code.

Or install feinbild, the plugin that ships this one along with the rest of its 3 skills, 3 commands.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/marsmike/feinschmiede/excalidraw/github.svg)](https://agentmods.dev/skills/marsmike/feinschmiede/excalidraw)

Your own site

<a href="https://agentmods.dev/skills/marsmike/feinschmiede/excalidraw"><img src="https://agentmods.dev/badge/skills/marsmike/feinschmiede/excalidraw/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/marsmike/feinschmiede/excalidraw"><img src="https://agentmods.dev/badge/skills/marsmike/feinschmiede/excalidraw.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 578 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.

Model	Per session	Once invoked
Fable 5.1	$0.00029	$0.00578
Opus 5	$0.00015	$0.00289
Sonnet 5	$0.00006	$0.00116
Haiku 4.5	$0.00003	$0.00058

Measured 10d ago against content hash 7f59aad694a1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

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 10d 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.

feinbild/skills/excalidraw/SKILL.md · 46 lines

How it starts

The opening of the file, as written. The whole thing — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.

feinbild — Excalidraw diagrams

Quick Start

/excalidraw flow.exc.dsl

feinbild is a command on your PATH. Expand a .exc.dsl to .excalidraw (brand colors resolved), then render to PNG.

feinbild excalidraw expand flow.exc.dsl --brand feinschliff   # -> flow.excalidraw
feinbild excalidraw render flow.excalidraw                    # -> flow.png
feinbild verify flow.excalidraw                               # lint: overflow, overlap, label collision

Primitives: box ellipse diamond dot line zone lane text and arrow <from> -> <to> [label:"…"]. Set theme dark in the DSL for a dark canvas. --brand selects the brand; render is brand-agnostic.

Default to clean

≤3 arrows per flow. More than that means the layout is wrong — re-chunk or pick another visualization.
No text over shapes. Labels live inside boxes or adjacent via a connector — never on a border.
Aspect-aware. Default 16:9 (1920×1080). If the brief specifies a target slot match it; otherwise embeds get squished.
Metaphor, not clutter. Briefs saying "messy" / "tangled" / "stitched" describe a CONCEPT — convey via composition (overlap, dim color, tight grouping), not by drawing actual chaos.

References

Methodology — argue-not-display patterns, depth assessment, hierarchy & arrow-routing rules
DSL syntax — full grammar: primitives, zone/lane, arrow flags, ports, colors, text levels
Design system — audience-calibrated complexity, visual vocabulary, 10 arrow-discipline principles
Examples — fan-out / pipeline-with-decision / multi-zoom blueprints
Deep examples — large layered architectures (MCU/Linux stacks, OTA flows, audience-contrast pairs); source DSL in examples/
Eval fixtures live in evals/evals.json; reusable DSL fixtures in examples/*.exc.dsl

Brand override

Override: inline @brand <name>, then --brand, then FEINSCHLIFF_BRAND. expand resolves brand colors; render is brand-agnostic.

Read the full file on GitHub · 46 lines

Files

What ships with it

12 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.

10d ago First seen · 46 lines · 29 tokens per session scan A 7f59aad694a1

Subscribe to this mod's changes

excalidraw is a skill published in the GitHub repository marsmike/feinschmiede (3 stars, last pushed 2d ago), licensed MIT. It adds 29 tokens to every session and 578 once invoked, about $0.0001 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.

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