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RFingAdam

drawio-engineering-mcp

by RFingAdam

open_drawio_mermaid

Convert Mermaid.js syntax into editable draw.io diagrams. Supports flowcharts, sequence diagrams, and more.

Instructions

Opens the draw.io editor with a diagram generated from Mermaid.js syntax. Supports flowcharts, sequence diagrams, class diagrams, state diagrams, entity relationship diagrams, and more using Mermaid.js syntax.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
contentYesThe Mermaid.js diagram definition. Example: 'graph TD; A-->B; B-->C;'
lightboxNoOpen in lightbox mode (read-only view). Default: false
darkNoDark mode setting. Default: auto
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must carry full behavioral disclosure. It does not mention whether the operation is read-only or destructive, or any other side effects. It only states it 'opens' the editor, leaving mutation unclear.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences that are front-loaded with the primary action and then elaborate on supported types. No redundant information or wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity and no output schema, the description is fairly complete. It covers the main action and supported types. Minor gap: could mention that it creates a new diagram or allows editing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with descriptions for all three parameters. The description adds no additional context beyond the schema, so it meets the baseline but does not exceed it.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool opens the draw.io editor with a diagram from Mermaid.js syntax, listing supported diagram types. This differentiates it from siblings like open_drawio_csv by specifying the input format.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for Mermaid diagrams but does not explicitly state when to use this tool over alternatives or provide exclusion criteria. Listing supported types gives some guidance, but no contrast with sibling tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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