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excalidraw-skill

Excalidraw canvas toolkit for creating, editing, and refining diagrams on a live canvas. Use when an agent needs to (1) draw or lay out diagrams, (2) iteratively refine them by describing the scene and screenshotting its own work, (3) export/import .excalidraw files or PNG/SVG images, (4) save/restore canvas snapshots, (5) convert Mermaid to Excalidraw, or (6) perform element-level CRUD, alignment, distribution, grouping, duplication, and locking. Primary interface is the bundled CLI (npx -y mcp-excalidraw-server <command>) which auto-starts the canvas server; MCP tools and a REST API are equivalent alternatives.

77

Quality

96%

Does it follow best practices?

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SecuritybySnyk

Passed

No findings from the security scan

SKILL.md
Quality
Evals
Security

Quality

Content

92%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is highly actionable with excellent workflow sequencing and validation feedback loops, and it appropriately offloads detailed reference material to one bundled cheatsheet. Only minor conciseness trimming would lift it further.

Suggestions

Tighten the 'Quality: Why It Matters' intro — the checklist already conveys the rationale, so the motivational paragraph can be cut.

Consider moving the full CLI Quick Reference table into references/cheatsheet.md and keeping only the 3–4 most-used commands inline to reduce body length.

The Coordinate System spacing/styling guidelines overlap with the cheatsheet's design guide; reference it instead of duplicating the palette and sizing rules inline.

DimensionReasoningScore

Conciseness

The body is dense and mostly free of concepts Claude already knows, but sections like 'Quality: Why It Matters' and the inlined CLI quick-reference table carry minor explanatory padding that could be trimmed or pushed to the cheatsheet.

4 / 5

Actionability

Copy-paste-ready CLI commands, a full task→command table, executable JSON element examples, and concrete arrow-routing snippets cover the common cases with no pseudocode.

5 / 5

Workflow Clarity

Multi-step workflows (drawing, iterative refinement, file I/O, snapshots) are clearly sequenced with an explicit screenshot-driven validation feedback loop, a quality checklist, and a dedicated error-recovery section.

5 / 5

Progressive Disclosure

SKILL.md stays an overview with critical guidance inline and clearly signals a single one-level-deep reference (references/cheatsheet.md, which exists) for the bulk CLI reference, 26 MCP tools, REST payloads, and design guide.

5 / 5

Total

19

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20

Passed

Description

100%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is exemplary: third-person voice, concrete capability list, explicit numbered 'Use when' triggers, and a clearly bounded Excalidraw-specific niche. It scores at the top of every dimension.

DimensionReasoningScore

Specificity

Lists multiple concrete actions spanning creation/editing/refining, export/import of .excalidraw and PNG/SVG, snapshots, Mermaid conversion, and element-level CRUD/alignment/distribution/grouping/duplication/locking — comprehensive coverage with no generic filler.

5 / 5

Completeness

Explicitly answers both 'what' ('toolkit for creating, editing, and refining diagrams on a live canvas') and 'when' via a numbered 'Use when an agent needs to (1)...(6)...' clause with concrete triggers.

5 / 5

Trigger Term Quality

Covers natural terms users would say ('draw or lay out diagrams', 'refine', 'Mermaid', 'screenshots', 'snapshots') plus file extensions (.excalidraw, PNG/SVG) and the named tool (Excalidraw).

5 / 5

Distinctiveness Conflict Risk

Clear Excalidraw-specific niche with distinct triggers (live canvas, .excalidraw files, Mermaid conversion) and a named primary interface, minimizing overlap with other skills.

5 / 5

Total

20

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
yctimlin/mcp_excalidraw
Reviewed

Table of Contents

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