Agentic Mermaid

Name: Agentic Mermaid
Author: adewale

by adewaleversion 0.5.6i★ –iComputer or cloud

Registry nameio.github.adewale/agentic-mermaid

Install

Overview

Description from the maker (original English)

Render, verify, describe, and safely edit Mermaid diagrams through MCP.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi3 of 3 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Computer or cloud
Transport: stdio, Streamable HTTP
Category: Design, images & audio

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 3 of 3 passed
Runs on the maker’s server: what you ask it goes through their server.
Can do 9 things (tools) execute, describe_sdk, render_svg, render_ascii …
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet
npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://agentic-mermaid.dev/mcp

Or run it on your computer

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "agentic-mermaid": {
      "command": "npx",
      "args": [
        "-y",
        "agentic-mermaid",
        "mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add --transport http agentic-mermaid https://agentic-mermaid.dev/mcp

Or run it on your computer

claude mcp add agentic-mermaid -- npx -y agentic-mermaid mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "agentic-mermaid": {
      "url": "https://agentic-mermaid.dev/mcp"
    }
  }
}

Or run it on your computer

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "agentic-mermaid": {
      "command": "npx",
      "args": [
        "-y",
        "agentic-mermaid",
        "mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "agentic-mermaid": {
      "type": "http",
      "url": "https://agentic-mermaid.dev/mcp"
    }
  }
}

Or run it on your computer

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "agentic-mermaid": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "agentic-mermaid",
        "mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://agentic-mermaid.dev/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.

execute
Run JavaScript in an isolated sandbox; return a value. No promises, async/await, dynamic import, or type annotations. SVG/ASCII/layout enforce security:'strict', embedFontImport:false. SDK: type DiagramKind='flowchart'|'state'|'sequence'|'timeline'|'class'|'er'|'journey'|'archite
describe_sdk
Return version-matched mutation operations for one diagram family, or use capability=resolved-scene for painted geometry, runtime limits and typed errors. Use detail=signatures for the compact op menu or detail=fields (default) for exact field types, required flags, enum values,
render_svg
Render a Mermaid source string to themeable SVG. Returns { ok, svg }. Layout is deterministic: identical input produces identical geometry. The hosted boundary forces security:'strict' and embedFontImport:false.
render_ascii
Render a Mermaid source string to text. Returns { ok, text }. useAscii true → plain ASCII (+,-,|); false/absent → Unicode box drawing (┌,─,│). targetWidth sets a hard terminal display-cell bound; impossible bounds return a typed error.
render_png
Rasterize a Mermaid source string to PNG. Returns { ok, png_base64 }. Hosted rendering uses resvg-wasm with bundled fonts; bytes may differ from the local napi renderer, so hosted PNG is a convenience surface, not part of the byte-determinism contract. For file/URL artifacts use
verify
Parse and verify source, structure, and renderability. This runs the graphical pipeline. Returns { ok, family, summary, warnings, layout: { bounds, nodes, edges } } for valid diagrams and { ok: false, errors } for parse failures. `family` is the detected diagram family and `summa
describe
Describe a Mermaid diagram. format=text returns { ok, text } with one or two summary sentences; format=json returns { ok, tree } with the AX tree; format=facts returns { ok, facts } with deterministic semantic fact lines for machine checking (for example edge A -> B : label, memb
mutate
Apply a list of structured edit ops to an existing Mermaid `source` and return the edited diagram. This is the declarative counterpart to `execute`: plain JSON in, plain JSON out, no sandbox. Prefer it for straightforward edits; reserve `execute` for logic the ops don't express.
build
Author a new Mermaid diagram from blank by folding a list of structured ops over an empty diagram of `family`. The declarative counterpart to hand-writing source. Returns the same envelope as `mutate`: { ok, family, source, verify } or { ok:false, family, opIndex, error }. Call `

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account adewale, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
✓ Pass
Endpoint responds
Responded in 451 ms (HTTP 200)
– Not applicable
Sign-in with OAuth
No sign-in needed
✓ Pass
No hidden instructions in tool descriptions
Read 9 tool descriptions and found no hidden instructions to the AI

Compared with others in Design, images & audioi

More stars than 0% of the other 2752 servers in this category
Published to the registry more recently than 87% of the other 2752 servers in this category
Basic checks equal to or better than 100% of the other 2752 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Agentic Mermaid safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

Either way works: install it on your computer or connect to the cloud version.

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.5.6) reached the registry 5 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Figma Context MCP, Claude Real Video, Figma MCP Server

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Figma Context MCP

by GLips

Give your coding agent access to your Figma data. Implement designs in any framework in one-shot.

Runs on your computer★ 16,165MITUpdated 5 months ago

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Claude Real Video

by HUANGCHIHHUNGLeo

Let any LLM watch a video locally — and search everything it has ever watched.

Runs on your computer★ 2,284MITUpdated 2 months ago

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Figma MCP Server

by figma

Figma’s official server gives AI your design data so it can turn designs into code or describe them accurately. Connects to Figma’s cloud.

Runs in the cloud★ 2,152Updated 13 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Agentic Mermaid

Beautiful diagrams, made with your agent.

Agentic Mermaid helps coding agents create styled diagrams from Mermaid source and edit existing diagrams through typed operations. Export SVG or PNG for documents, and ASCII or Unicode for terminal review.

It is forked from lukilabs/beautiful-mermaid. Published on npm as agentic-mermaid; the GitHub repository is adewale/agentic-mermaid; the live site is agentic-mermaid.dev.

A login flow with MFA, rendered directly by Agentic Mermaid. Mermaid source · Style and reproduction command

Live Demo & Samples · Live Editor

Ask your coding agent:

Read Instructions_for_agents.md in this repository, or https://agentic-mermaid.dev/llms.txt if you don't have a checkout. Draw Browser → API → Database using the hand-drawn style and nord-light palette. Verify it, then return the Mermaid source and an SVG.

Agent setup and skills · Try the same diagram in JavaScript

Docs: docs index · getting started · agent guide · agent API cookbook · design system · skills · fork differences · vs Mermaid & Beautiful Mermaid · changelog

Why Agentic Mermaid

Choose a built-in style, or keep your diagram's colors and fonts in a JSON style file. Inspect the rendered result before publishing.

You want	Agentic Mermaid gives you
An agent to draft the diagram	Mermaid source plus a verified render path
Beautiful defaults	Built-in looks such as `watercolor`, `blueprint`, `hand-drawn`, and `publication-figure`
Brand fit	Style + Palette stacks and custom JSON palettes you can keep in your repo
Safe edits later	`parseRegisteredMermaid` → family narrower → `mutate` → `verifyMermaid` → `serializeMermaid`
Reviewable artifacts	SVG, PNG, ASCII, Unicode, and JSON layout from the same source

The agent workflow is the guardrail behind the polish: agents should not guess from pixels, concatenate strings, or regenerate whole diagrams when a structured edit is available.

Highlights

Discover supported diagrams and edits — am capabilities --json reports what the installed version supports, including registered extensions.
SVG, PNG, ASCII, Unicode, JSON — export images, review diagrams in the terminal, or inspect positions as JSON layout.
Render SVG without a browser — the synchronous JavaScript API runs without a DOM or Puppeteer.
Composable styles — { style: ['hand-drawn', 'dracula'] } combines a look with a palette. Set colors, fonts, strokes, fills and backdrops in a JSON style. seed re-rolls the ink, never the layout.
Match your editor's colors — choose a built-in palette, theme from two colors, or adapt a VS Code theme with Shiki.
Agent-native editing — use typed operations for modeled syntax. Inputs with unmodeled syntax retain their source; source-preserving edits cover selected Class and Flowchart operations.
CLI + MCP + library — use am, connect agentic-mermaid-mcp, or import agentic-mermaid/agent for rendering and editing. See the API reference for the other library and browser entry points.

Installation

Requires Node.js 22 or later, or Bun 1.4.0 or later. The package is ESM-only; use import, or dynamic import() from CommonJS.

npm install agentic-mermaid       # or: bun add agentic-mermaid / pnpm add agentic-mermaid

npx --no-install agentic-mermaid --help

The am … examples below name the published bin. After a project-local npm install, invoke it from a shell as npx --no-install agentic-mermaid … (or from an npm script as am …). From a source checkout, use bun run bin/am.ts … instead.

Output quick starts

Use agentic-mermaid/agent when you want one import path for styled renders, output formats, and the structured edit API.

SVG

Save this as diagram.mjs:

import { writeFileSync } from 'node:fs'

import { renderMermaidSVG } from 'agentic-mermaid/agent'

const svg = renderMermaidSVG(flowchart LR Browser --> API --> Database, { style: ['hand-drawn', 'nord-light'], security: 'strict', })

writeFileSync('diagram.svg', svg)

node diagram.mjs

Open diagram.svg to see Browser → API → Database in the hand-drawn style with the nord-light palette.

PNG

import { writeFileSync } from 'node:fs'

import { renderMermaidPNG } from 'agentic-mermaid/agent'

const png = renderMermaidPNG(flowchart TD Start --> Done, { fitTo: { width: 1200 }, background: '#fff', })

writeFileSync('diagram.png', png)

CLI equivalent:

am render diagram.mmd --format png --output diagram.png

ASCII / Unicode

import { renderMermaidASCII } from 'agentic-mermaid/agent'

const unicode = renderMermaidASCII(flowchart LR A --> B) const ascii = renderMermaidASCII(flowchart LR A --> B, { useAscii: true })

Agent quick start

If your coding agent can read repo files, point it at:

skills/agentic-mermaid-diagram-workflow/SKILL.md for diagram authoring/editing.
skills/agentic-mermaid-live-editor/SKILL.md for editor changes.

If it only has shell access:

am --agent-instructions

am capabilities --json am preview diagram.mmd --security strict --open am mutate diagram.mmd --op '{"kind":"set_label","target":"API","label":"API gateway"}' --json

For an existing diagram, follow parse → narrow → mutate → verify → serialize. For a new diagram, author Mermaid source, then parse and verify it. To wire Agentic Mermaid into another repo, run npx agentic-mermaid init-agent (or bun run bin/am.ts init-agent from a source checkout); it writes a non-clobbering AGENTS.md section, root skills/ bundle, and .mcp.json sample.

Use strict preview for human inspection and mutate --op/--ops for verified one-shot or batched edits.

For multi-step MCP edits, use Code Mode execute(code) with the same mermaid.* SDK names. See the agent API cookbook for library, CLI and MCP recipes.

MCP server

Agentic Mermaid ships a Model Context Protocol server so MCP-capable agents can render and safely edit diagrams without shelling out.

After installation, start the local stdio server:

npx --no-install agentic-mermaid mcp

Use the library, CLI or local MCP for private diagrams, offline work, larger inputs or local PNG files. The MCP transport guide covers HTTP/SSE and file/URL artifacts; agent setup shows how to generate a sample client configuration. The tool reference and Code Mode guide explains the available tools and multi-step edits.

An optional public, unauthenticated MCP endpoint runs at https://agentic-mermaid.dev/mcp. It accepts MCP JSON-RPC rather than REST render requests, caps inputs at 64 KB and returns PNG as base64. Hosted calls send your source or code to the server; see the privacy notice. Directory maintainers can use the MCP listing record.

Structured edit example

Change the API node's displayed label while keeping its connection to DB:

import { parseRegisteredMermaid, asFlowchart, mutate, verifyMermaid, serializeMermaid } from 'agentic-mermaid/agent'

const parsed = parseRegisteredMermaid('flowchart TD\n API --> DB') if (!parsed.ok) throw new Error('parse failed')

const flow = asFlowchart(parsed.value) if (!flow) throw new Error(not a structured flowchart: ${parsed.value.kind})

const next = mutate(flow, { kind: 'set_label', target: 'API', label: 'API gateway' }) if (!next.ok) throw new Error(next.error.message)

const verify = verifyMermaid(next.value) if (!verify.ok) throw new Error(JSON.stringify(verify.warnings, null, 2))

const source = serializeMermaid(next.value) console.log(source)

Output:

flowchart TD

API[API gateway] --> DB

The node ID is still API; its displayed label is now API gateway, and the API → DB connection remains. Verification checks for structural and geometry problems; review the rendered result and confirm it expresses your intent before saving.

Rules:

Use the matching exported as narrower before mutating an existing structured diagram.
Mutation ops use kind, not type.
Run verifyMermaid before every commit point.
Do not call mutate on opaque fallback bodies; the narrower returns null for unmodeled syntax.
For opaque Class/Flowchart inputs, bounded source-preserving edits support Class add_member/remove_member and Flowchart set_label/rename_node. Use mutatePreservingSource, applyOps with mode: 'source-preserving', or CLI --preserve-source; MCP and the editor worker expose the same explicit mode. Save exact source and inspect the retained portability diagnostics; ambiguous ownership and unsupported dependencies refuse atomically.

Supported diagram families

Run am capabilities --json for the supported families and edit operations in your installed version. See diagram families for syntax examples and compatibility notes.

Live editor and examples

Examples — supported families, Style + Palette combinations, and the rich shared examples corpus.
Live editor — SVG/PNG exports and URL sharing.
examples/agent-loop.ts
examples/mcp-vs-cli-complex-diagrams.ts
[examples/agent-improve-auth-flow.ts](https://gi

Only the beginning is shown; read the rest in the repo

Agentic Mermaid

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Or run it on your computer

Or run it on your computer

Or run it on your computer

Or run it on your computer

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Design, images & audioi

Common questions

Alternatives

Figma Context MCP

Claude Real Video

Figma MCP Server

README from the maker

Agentic Mermaid

Why Agentic Mermaid

Highlights

Installation

Output quick starts

SVG

PNG

ASCII / Unicode

Agent quick start

MCP server

Structured edit example

Supported diagram families

More documentation

Live editor and examples