agentmods.dev

mermaid_diagram

mermaid_diagram is an MCP server for Claude Code from Abilityai/agent-cornelius. Its token cost is not measured, scanned A, original, no licence file.

A local MCP server for creating Mermaid diagrams. Mermaid is a text-based format for describing diagrams such as flowcharts and sequence diagrams.

In plain words
What is it for?
Use it when an agent needs to work with Mermaid diagrams in a project.
Why use it?
It provides an agent connection to Mermaid diagram tooling rather than requiring diagram descriptions to be handled manually.

MCP server for Claude Code

Written for Claude Code: installed under .claude/. Also seen: listed in a Claude config.

One of 2 entries in claude_desktop_config.json upstream. Installing this one merges just its entry into your config; the other 1 are separate, each on its own page.

not rated 16repo 9mo ago A scan tokens not measured no licence

Good fit Use it when an agent needs to work with Mermaid diagrams in a project.

Compare 6 mcp servers from other repositories ↓
Install with agentmods
npx agentmods add mcp/abilityai/agent-cornelius/mermaid_diagram
View source ↗ Abilityai/agent-cornelius
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/Abilityai/agent-cornelius

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for mermaid_diagram

README.md
[![agentmods](https://agentmods.dev/badge/mcp/abilityai/agent-cornelius/mermaid_diagram/github.svg)](https://agentmods.dev/mcp/abilityai/agent-cornelius/mermaid_diagram)
Your own site
<a href="https://agentmods.dev/mcp/abilityai/agent-cornelius/mermaid_diagram"><img src="https://agentmods.dev/badge/mcp/abilityai/agent-cornelius/mermaid_diagram/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for mermaid_diagram

Your own site · 80×15
<a href="https://agentmods.dev/mcp/abilityai/agent-cornelius/mermaid_diagram"><img src="https://agentmods.dev/badge/mcp/abilityai/agent-cornelius/mermaid_diagram.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Security

Grade A, and why

mermaid_diagram scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 14d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/claude_desktop_config.json · 11 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Same file

What else claude_desktop_config.json configures

This page is one entry in a file that holds 2. Installing the file brings all of them; each is measured and scanned on its own page.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 14d ago First seen · 11 lines scan A 7372b93bec55

Subscribe to this mod's changes

mermaid_diagram is an MCP server published in the GitHub repository Abilityai/agent-cornelius (16 stars, last pushed 9mo ago), with no licence file. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-02.

Design and UX
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