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skill CX Codex GP ChatGPT official · OpenAI

figma-generate-diagram — Codex skill: what it does, how to install

Prepares Mermaid.js syntax for the generate_diagram tool and renders editable FigJam boards. Needed before building flowcharts, ERDs, or sequence diagrams.

Install into Codex · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add openai/plugins --skill figma-generate-diagram -a codex
Open on GitHub

What figma-generate-diagram does

This skill acts as a required filter before invoking the generate_diagram tool. It instructs the agent to create clean Mermaid.js code that renders as an editable FigJam diagram. Supported formats include flowcharts, sequence diagrams, state diagrams, ER diagrams, and Gantt charts.

The skill enforces strict syntax rules. Mermaid input cannot contain emojis, HTML tags, or literal \n escape sequences. Node identifiers require camelCase formatting without underscores to keep line routing intact. If you request an unsupported diagram such as a mindmap, class diagram, or pie chart, the skill halts execution instead of attempting a broken tool call.

Because generated boards live in FigJam, calling design-only APIs like figma.createPage() will throw an error. Keep this skill active if you generate architecture flows or database models through Codex. Without these guidelines, Mermaid rendering frequently fails.

What it helps with

  • Prevent Mermaid syntax failures when rendering FigJam boards
  • Generate architecture flowcharts directly from source code
  • Build database ER diagrams from table definitions
  • Trace API authentication handshakes with sequence diagrams

Example prompts for the agent

  • Generate a FigJam ER diagram for our database schema
  • Draw a sequence diagram for the API authentication flow
  • Build an architecture flowchart for services in this repository

How to install figma-generate-diagram

1Skills CLI (Vercel)

npx skills add openai/plugins --skill figma-generate-diagram -a codex

2Manually: put the files in place

.agents/skills/figma-generate-diagram/SKILL.md

For all projects use ~/.agents/skills/

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Questions about figma-generate-diagram

How to install figma-generate-diagram in Codex?

Run npx skills add openai/plugins --skill figma-generate-diagram -a codex in your project terminal.

What does figma-generate-diagram do?

It routes requests to appropriate diagram workflows and enforces syntax constraints for Mermaid before calling generate_diagram.

Which diagram formats are unsupported?

The tool rejects mindmaps, pie charts, C4 diagrams, class diagrams, and git graphs. The skill warns about these limitations before running any calls.

See also

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