What is mermaid-render?
mermaid-render is a Claude Code mod by maxp-riot that draws the ```mermaid blocks of Claude's replies as images in the terminal, in light or dark, and opens them in Excalidraw. It is listed under Interface and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | maxp-riot |
| Repository | maxp-riot/mermaid-render |
| Popularity | no public popularity data yet |
| Category | Interface |
| Security | Review before installing (64/100) |
| Rank | #3,933 of 5,272 Claude Code mods; #1,636 in Interface |
| License | MIT |
| Last commit | 2026-10-08 |
| Hooks | 4 events |
| Sees | only the events it hooks |
| Draws on | AssistantMessage |
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 |
|---|---|
$.command.register | |
$.config.list | |
$.env.get | reads env vars |
$.fs.read | reads files |
$.fs.stat | reads files |
$.fs.write | writes files |
$.process.run | runs processes |
$.session.messages | reads the transcript |
$.ui.log | draws interface |
$.ui.resolve | draws interface |
$.ui.toast | 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/maxp-riot/mermaid-render claude plugin validate ./mermaid-render/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add maxp-riot/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/maxp-riot/mermaid-render. Run claude plugin validate on it first and show me what it can access before you enable it.