Claude Code mod

mermaid-draw

Mermaid diagrams in Claude Code: every ```mermaid block Claude writes is drawn as box art, in colour, right where the fence was in the transcript. Needs function hooks (early access) and an interactive terminal.

5 starsGuard & safety mods Plugin marketplaceValidates on Claude Code 2.1.316 Source

Install

Inside Claude Code

/plugin marketplace add galElmalah/claude-mods
/plugin install mermaid-draw@gal-mods

Mods install like plugins. Run /reload-plugins or start a new session to load it.

What it can access

Reach: L0Draws and remembers: persists state, draws
Draws in: AssistantMessage
Hooks: session.startui.rendercommand.run

From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.

How Claude Code mods work

A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.

Claude Code docs

Details

Repository: galElmalah/claude-mods
Folder: claude-mermaid
Marketplace: gal-mods
Author: Gal Elmalah
Type: Guard & safety mods
License: MIT
Last updated: 10 October 2026
Listed in: awesome-claude-code-mods

FAQ

What is mermaid-draw?

What can the mermaid-draw mod access?

Its widest reach is "draws and remembers" (persists state, draws). It draws in AssistantMessage. Like any mod, it runs with your permissions.

How do I install mermaid-draw?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add galElmalah/claude-mods and then /plugin install mermaid-draw@gal-mods.

Is mermaid-draw popular?

galElmalah/claude-mods has 5 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 10 October 2026.

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