NicholasSpisak

Excalidraw — Development skill for Claude Code

Development community

Let Claude Code or Codex draw real Excalidraw diagrams — flowcharts, wireframes, slide decks, SWOT, Lean Canvas & 17 official use cases.

How to install Excalidraw

This entry records only its repository, not the path inside it, so there is no exact command to give. Open NicholasSpisak/excalidraw and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Excalidraw does

Let Claude Code or Codex draw real Excalidraw diagrams — flowcharts, wireframes, slide decks, SWOT, Lean Canvas & 17 official use cases. Install: npx skills add NicholasSpisak/excalidraw

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README

excalidraw — agent skill

Create and edit Excalidraw diagrams from Claude Code, Codex, or any agent harness — flowcharts, architecture diagrams, sequence diagrams, UML, Gantt charts, mind maps, wireframes, slide decks, roadmaps, personas, brainstorming boards, Lean Canvas, SWOT and competitor analyses, and game-design boards, aligned with the official [Excalidraw use cases](https://plus.excalidraw.com/use-cases).

Backed by the official Excalidraw+ MCP server (`https://api.excalidraw.com/api/v1/mcp`) — scenes are created in your Excalidraw+ workspace, verified by screenshot, and returned as links.

Install

npx skills add NicholasSpisak/excalidraw

Works with the [Vercel skills framework](https://github.com/vercel-labs/skills); installs for Claude Code, Codex, and other supported agents.

Credentials

You need an Excalidraw+ API key (Excalidraw+ → Settings → API keys). **Never commit it.** Provide it one of two ways:

# environment variable (works for the bundled CLI and Codex MCP config)
export EXCALIDRAW_API_KEY=sk-...

# or a key file the bundled CLI falls back to
mkdir -p ~/.config/excalidraw
printf '%s\n' 'sk-...' > ~/.config/excalidraw/api_key
chmod 600 ~/.config/excalidraw/api_key

Native MCP setup (optional, recommended)

The skill works out of the box through its bundled CLI. For native MCP tool calling, add the official server config:

**Claude Code** (`~/.claude.json` or `.mcp.json`):

{
  "mcpServers": {
    "excalidraw": {
      "type": "http",
      "url": "https://api.excalidraw.com/api/v1/mcp",
      "headers": {
        "Authorization": "Bearer "
      }
    }
  }
}

**Codex** (`~/.codex/config.toml`):

[mcp_servers.excalidraw]
url = "https://api.excalidraw.com/api/v1/mcp"
env_http_headers = { Authorization = "EXCALIDRAW_API_KEY" }

With `env_http_headers`, the env var's value is injected verbatim as the header — set `EXCALIDRAW_API_KEY="Bearer sk-..."`. (Codex's `bearer_token_env_v