What is mermaid-render?
mermaid-render is a Claude Code mod by ejklock that renders the Mermaid diagrams Claude Code writes or reads as elegant cards in the transcript: colored Unicode art in any terminal, real SVG on desktop. It is listed under Interface and has 1 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | ejklock |
| Repository | ejklock/claude-mermaid-render |
| Popularity | 1 GitHub stars |
| Category | Interface |
| Security | Review before installing (64/100) |
| Rank | #1,769 of 5,272 Claude Code mods; #712 in Interface |
| License | MIT |
| Last commit | 2026-10-09 |
| Hooks | 1 events |
| Sees | only the events it hooks |
| Draws on | ToolGroup, any component |
Is mermaid-render safe to install?
mermaid-render scores 64/100 on the MCPMods security check: Review before installing. Things to review: starts processes outside the sandbox; writes files or config; reads environment variables. It passed 5 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| No network access | Pass |
| Starts processes outside the sandbox | Review |
| Writes files or config | Review |
| Reads environment variables | Review |
| Only sees the events it hooks | Pass |
| Doesn't drive Claude | Pass |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.env.get | reads env vars |
$.fs.write | writes files |
$.process.run | runs processes |
$.ui.resolve | draws interface |
How do I install mermaid-render?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/ejklock/claude-mermaid-render claude plugin validate ./claude-mermaid-render/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add ejklock/claude-mermaid-render && claude plugin install mermaid-render@mermaid-render
Or ask Claude to set it up
Paste this into Claude Code and it installs mermaid-render for you:
Install the "mermaid-render" Claude Code mod from https://github.com/ejklock/claude-mermaid-render. Run claude plugin validate on it first and show me what it can access before you enable it.