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drawio

Generate draw.io diagrams as .drawio files, optionally export to PNG/SVG/PDF with embedded XML

Install with Tessl CLI

npx tessl i github:jgraph/drawio-mcp --skill drawio
What are skills?

77

Does it follow best practices?

Validation for skill structure

SKILL.md
Review
Evals

Discovery

67%

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 effectively communicates specific capabilities around draw.io diagram generation and export formats, with good distinctiveness due to the tool-specific terminology. However, it lacks explicit trigger guidance ('Use when...') and could benefit from more natural user-facing keywords like 'flowchart' or 'architecture diagram' that users commonly say when needing diagramming help.

Suggestions

Add a 'Use when...' clause specifying triggers like 'when user asks for diagrams, flowcharts, architecture visuals, or mentions draw.io'

Include common diagram type keywords users naturally say: 'flowchart', 'architecture diagram', 'sequence diagram', 'visual diagram', 'diagram tool'

DimensionReasoningScore

Specificity

Lists multiple specific concrete actions: 'Generate draw.io diagrams', 'export to PNG/SVG/PDF', and 'embedded XML'. These are clear, actionable capabilities.

3 / 3

Completeness

Clearly answers 'what' (generate diagrams, export to various formats) but lacks an explicit 'Use when...' clause or trigger guidance for when Claude should select this skill.

2 / 3

Trigger Term Quality

Includes good terms like 'draw.io', '.drawio files', 'PNG/SVG/PDF', and 'diagrams', but missing common variations users might say like 'flowchart', 'architecture diagram', 'visual diagram', or 'diagram tool'.

2 / 3

Distinctiveness Conflict Risk

Very specific niche with 'draw.io' and '.drawio files' as distinct identifiers. Unlikely to conflict with other diagramming or document skills due to the specific tool reference.

3 / 3

Total

10

/

12

Passed

Implementation

77%

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

This is a well-structured, highly actionable skill with clear workflows and executable examples. The main weakness is verbosity - the extensive style reference tables, edge routing details, and container examples could be condensed or moved to separate reference files. The skill successfully teaches draw.io diagram generation but uses more tokens than necessary for some sections.

Suggestions

Move the detailed style properties table and container examples to a separate REFERENCE.md file, keeping only the most essential styles inline

Condense the edge routing section - the arrowhead spacing explanation is overly detailed for what could be a simple 'ensure 20px minimum final segment' rule

Consider removing the 'Useful style properties' table entirely and just linking to the external draw.io style reference, since Claude can look it up

DimensionReasoningScore

Conciseness

The skill is mostly efficient but includes some unnecessary detail like the full table of style properties and extensive edge routing explanations that could be condensed. The container section is thorough but somewhat verbose for what Claude likely already understands about XML parent-child relationships.

2 / 3

Actionability

Provides fully executable XML examples, specific CLI commands with all flags explained, platform-specific paths, and copy-paste ready code snippets. The examples are concrete and complete, not pseudocode.

3 / 3

Workflow Clarity

Clear 4-step workflow at the top with explicit sequencing. The process includes validation through the 'CRITICAL: XML well-formedness' section, and the workflow handles conditional branching (export vs no export) clearly.

3 / 3

Progressive Disclosure

Content is well-organized with clear sections, but it's a monolithic document that could benefit from splitting detailed reference material (style properties, edge routing, container examples) into separate files. The external links to draw.io docs are good but inline content is heavy.

2 / 3

Total

10

/

12

Passed

Validation

90%

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

Validation10 / 11 Passed

Validation for skill structure

CriteriaDescriptionResult

allowed_tools_field

'allowed-tools' contains unusual tool name(s)

Warning

Total

10

/

11

Passed

Reviewed

Table of Contents

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