Claude Code mod
mermaid-render
Draws the ```mermaid blocks of Claude's replies as images in the terminal, in light or dark, and opens them in Excalidraw
Install
/plugin marketplace add maxp-riot/mermaid-render
/plugin install mermaid-render@mermaid-renderMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: runs processes, writes files, reads files, reads env vars, reads settings, reads the transcript, draws
- Draws in
AssistantMessage- Hooks
session.startcommand.runui.renderprompt.compose
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
- maxp-riot/mermaid-render
- Folder
.- Marketplace
mermaid-render- Author
- maxp-riot
- License
- MIT
- Last updated
- 8 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is mermaid-render?
Draws the ```mermaid blocks of Claude's replies as images in the terminal, in light or dark, and opens them in Excalidraw It is a mod for Claude Code, from maxp-riot/mermaid-render on GitHub.
What can the mermaid-render mod access?
Its widest reach is "writes or runs" (runs processes, writes files, reads files, reads env vars, reads settings, reads the transcript, draws). It draws in AssistantMessage. Like any mod, it runs with your permissions.
How do I install mermaid-render?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add maxp-riot/mermaid-render and then /plugin install mermaid-render@mermaid-render.
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