What is mermaid?
mermaid is a Claude Code mod by WhiteKr that render ```mermaid fences in assistant replies as Unicode box-drawing diagrams in the terminal transcript. It is listed under Interface and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | WhiteKr |
| Repository | WhiteKr/claude-plugin-mermaid |
| Popularity | no public popularity data yet |
| Category | Interface |
| Security | Low risk (100/100) |
| Rank | #5,122 of 5,272 Claude Code mods; #2,097 in Interface |
| License | MIT |
| Last commit | 2026-09-16 |
| Hooks | 1 events |
| Sees | only the events it hooks |
| Draws on | AssistantMessage |
Is mermaid safe to install?
mermaid scores 100/100 on the MCPMods security check: Low risk. No checks raised a concern. It passed 8 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 no processes | Pass |
| Writes no files or config | Pass |
| Doesn't read environment variables | Pass |
| Only sees the events it hooks | Pass |
| Doesn't drive Claude | Pass |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
How do I install mermaid?
- 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/WhiteKr/claude-plugin-mermaid claude plugin validate ./claude-plugin-mermaid/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
git clone https://github.com/WhiteKr/claude-plugin-mermaid && claude --plugin-dir ./claude-plugin-mermaid/.
Or ask Claude to set it up
Paste this into Claude Code and it installs mermaid for you:
Install the "mermaid" Claude Code mod from https://github.com/WhiteKr/claude-plugin-mermaid. Run claude plugin validate on it first and show me what it can access before you enable it.