Claude Code mod

cs-mermaid

Draws mermaid flowcharts in replies inline, as coloured blocks and lines.

52 starsGuard & safety modsValidates on Claude Code 2.1.316 Source

Install

From source

git clone https://github.com/hex/claude-sessions.git
claude --plugin-dir ./claude-sessions/mods/cs-mermaid

The repo has no marketplace file, so load the plugin folder directly with --plugin-dir.

What it can access

Reach: L1Reads: reads settings, draws
Draws in: AssistantMessage
Hooks: ui.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.

Claude Code docs

Details

Repository: hex/claude-sessions
Folder: mods/cs-mermaid
Author: cs
Type: Guard & safety mods
License: MIT
Last updated: 30 October 2026
Listed in: awesome-claude-code-mods

FAQ

What is cs-mermaid?

Draws mermaid flowcharts in replies inline, as coloured blocks and lines. It is a mod for Claude Code, from hex/claude-sessions on GitHub.

What can the cs-mermaid mod access?

Its widest reach is "reads" (reads settings, draws). It draws in AssistantMessage. Like any mod, it runs with your permissions.

How do I install cs-mermaid?

Clone hex/claude-sessions and start Claude Code with --plugin-dir pointing at the mod's folder (mods/cs-mermaid).

Is cs-mermaid popular?

hex/claude-sessions has 52 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 30 October 2026.

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