Claude Code mod
mermaid-c4-zoom
A side pane in Claude Code that draws mermaid diagrams as colored text art, with C4-style zoom: click a box to see the level inside it
Install
/plugin marketplace add testy-cool/mermaid-c4-zoom
/plugin install mermaid-c4-zoom@mermaid-c4-zoomMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: runs processes, drives Claude, reads mod state, draws
- Sees
- classic hooks, mcp__mermaid-c4-zoom__show_diagram calls
- Draws in
Pane- Hooks
session.startclassic.UserPromptSubmittool.callturn.completecommand.runui.render
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.
Details
- Repository
- testy-cool/mermaid-c4-zoom
- Folder
.- Marketplace
mermaid-c4-zoom- Author
- testy-cool
- License
- MIT
- Last updated
- 8 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is mermaid-c4-zoom?
A side pane in Claude Code that draws mermaid diagrams as colored text art, with C4-style zoom: click a box to see the level inside it It is a mod for Claude Code, from testy-cool/mermaid-c4-zoom on GitHub.
What can the mermaid-c4-zoom mod access?
Its widest reach is "writes or runs" (runs processes, drives Claude, reads mod state, draws). It sees classic hooks, mcp__mermaid-c4-zoom__show_diagram calls. It draws in Pane. Like any mod, it runs with your permissions.
How do I install mermaid-c4-zoom?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add testy-cool/mermaid-c4-zoom and then /plugin install mermaid-c4-zoom@mermaid-c4-zoom.
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