# Mermaid Chart MCP

```json
{
  "name": "Mermaid Chart MCP",
  "slug": "mermaid_chart_mcp",
  "url": "https://composio.dev/toolkits/mermaid_chart_mcp",
  "markdown_url": "https://composio.dev/toolkits/mermaid_chart_mcp.md",
  "logo_url": "https://logos.composio.dev/api/mermaid_chart_mcp",
  "categories": [
    "design & creative tools"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-08-09T06:42:28.609Z"
}
```

![Mermaid Chart MCP logo](https://logos.composio.dev/api/mermaid_chart_mcp)

## Description

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Mermaid Chart MCP or direct API to validate Mermaid syntax, render diagrams as SVG, preview diagrams interactively, and iterate on chart fixes through natural language.

## Summary

Mermaid Chart MCP is a no-auth MCP server for validating Mermaid syntax and rendering diagrams as SVG.
Use it to preview, zoom, and iterate on diagrams quickly without wiring up custom rendering code.

## Categories

- design & creative tools

## Toolkit Details

- Tools: 1

## Images

- Logo: https://logos.composio.dev/api/mermaid_chart_mcp

## Authentication

- **No Auth**
  - Type: `custom`
  - Description: No Auth authentication for Mermaid Chart MCP.
  - Setup:
    - Configure No Auth credentials for Mermaid Chart MCP.
    - Use the credentials when creating an auth config in Composio.

## Suggested Prompts

- Validate checkout flow Mermaid syntax
- Render deployment sequence diagram as SVG
- Preview user journey diagram interactively

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `MERMAID_CHART_MCP_VALIDATE_AND_RENDER_MERMAID_DIAGRAM` | Validate and render mermaid diagram | Use this tool to output a Mermaid diagram: - The tool will validate the diagram syntax and render it to a UI widget. - The widget will contain the diagram code, a "Copy Code" button, and a rendered diagram. - If the diagram is invalid, the widget will give user a link to repair the diagram in Mermaid Live. |

## Supported Triggers

None listed.

## Installation and MCP Setup

### Path 1: SDK Installation

#### Path 1, Step 1: Install Composio

Install the Composio SDK
```python
pip install composio_openai
```

```typescript
npm install @composio/openai
```

#### Path 1, Step 2: Initialize Composio and Create Tool Router Session

Import and initialize Composio client, then create a Tool Router session
```python
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
openai = OpenAI()
session = composio.create(user_id='your-user-id')
```

```typescript
import OpenAI from 'openai';
import { Composio } from '@composio/core';
import { OpenAIResponsesProvider } from '@composio/openai';

const composio = new Composio({
  provider: new OpenAIResponsesProvider(),
});
const openai = new OpenAI({});
const session = await composio.create('your-user-id');
```

#### Path 1, Step 3: Execute Mermaid Chart MCP Tools via Tool Router with Your Agent

Get tools from Tool Router session and execute Mermaid Chart MCP actions with your Agent
```python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'Validate this Mermaid flowchart syntax and render it as SVG: graph TD; A[User] --> B[Checkout]; B --> C[Payment]; C --> D[Confirmation]'
  }]
)
result = composio.provider.handle_tool_calls(
  response=response,
  user_id='your-user-id'
)
print(result)
```

```typescript
const tools = session.tools;
const response = await openai.responses.create({
  model: 'gpt-4.1',
  tools: tools,
  input: [{
    role: 'user',
    content: 'Validate this Mermaid flowchart syntax and render it as SVG: graph TD; A[User] --> B[Checkout]; B --> C[Payment]; C --> D[Confirmation]'
  }],
});
const result = await composio.provider.handleToolCalls(
  'your-user-id',
  response.output
);
console.log(result);
```

### Path 2: MCP Server Setup

#### Path 2, Step 1: Install Composio

Install the Composio SDK for Python or TypeScript
```python
pip install composio claude-agent-sdk
```

```typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
```

#### Path 2, Step 2: Initialize Client and Create Tool Router Session

Import and initialize the Composio client, then create a Tool Router session for Mermaid Chart MCP
```python
from composio import Composio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions

composio = Composio(api_key='your-composio-api-key')
session = composio.create(user_id='your-user-id')
url = session.mcp.url
```

```typescript
import { Composio } from '@composio/core';

const composio = new Composio({ apiKey: 'your-api-key' });
const session = await composio.create('your-user-id');
console.log(`Tool Router session created: ${session.mcp.url}`);
```

#### Path 2, Step 3: Connect to AI Agent

Use the MCP server with your AI agent (Anthropic Claude or Mastra)
```python
import asyncio

options = ClaudeAgentOptions(
    permission_mode='bypassPermissions',
    mcp_servers={
        'tool_router': {
            'type': 'http',
            'url': url,
            'headers': {
                'x-api-key': 'your-composio-api-key'
            }
        }
    },
    system_prompt='You are a helpful assistant with access to Mermaid Chart MCP tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('Render this Mermaid sequence diagram as SVG and tell me if the syntax is valid: sequenceDiagram\nparticipant User\nparticipant API\nUser->>API: Submit order\nAPI-->>User: Return confirmation')
        async for message in client.receive_response():
            if hasattr(message, 'content'):
                for block in message.content:
                    if hasattr(block, 'text'):
                        print(block.text)

asyncio.run(main())
```

```typescript
import { openai } from '@ai-sdk/openai';
import { experimental_createMCPClient as createMCPClient } from '@ai-sdk/mcp';
import { generateText } from 'ai';

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: session.mcp.url,
    headers: {
      'x-api-key': 'your-composio-api-key',
    },
  },
});

const tools = await client.tools();
const { text } = await generateText({
  model: openai('gpt-4o'),
  tools,
  messages: [{
    role: 'user',
    content: 'Render this Mermaid sequence diagram as SVG and tell me if the syntax is valid: sequenceDiagram\nparticipant User\nparticipant API\nUser->>API: Submit order\nAPI-->>User: Return confirmation'
  }],
  maxSteps: 5,
});

console.log(`Agent: ${text}`);
```

## Why Use Composio?

### 1. AI Native Mermaid Chart MCP Integration

- Supports both Mermaid Chart MCP and direct API based integrations
- Structured, LLM-friendly schemas so agents can validate Mermaid diagrams without guessing
- Ready-made tools for syntax checks, SVG rendering, and interactive diagram previews

### 2. Managed Auth

- Mermaid Chart MCP uses no-auth access, so your agents can start validating and rendering diagrams right away
- No hard-coded API keys or OAuth setup needed for this toolkit
- Composio still gives you a central place to manage agent access and execution

### 3. Agent Optimized Design

- Tools are shaped for language models, making Mermaid syntax fixes more reliable
- Agents can move from broken diagram text to a rendered SVG in one flow
- Comprehensive execution logs show every validation, render, and preview request

### 4. Enterprise Grade Security

- Fine-grained RBAC so you control which agents and users can access Mermaid Chart MCP
- Scoped access for diagram validation and rendering workflows
- Full audit trail of agent actions to support review and compliance

## Use Mermaid Chart MCP with any AI Agent Framework

Choose a framework you want to connect Mermaid Chart MCP with:

- [ChatGPT Work](https://composio.dev/toolkits/mermaid_chart_mcp/framework/chatgpt)
- [Claude Cowork](https://composio.dev/toolkits/mermaid_chart_mcp/framework/claude-cowork)

## Related Toolkits

- [Figma](https://composio.dev/toolkits/figma) - Figma is a collaborative interface design tool for teams and individuals. It streamlines design workflows with real-time collaboration and easy sharing.
- [Abyssale](https://composio.dev/toolkits/abyssale) - Abyssale is a creative automation platform for generating images, videos, GIFs, PDFs, and HTML5 content programmatically. It streamlines and scales visual content production for marketing, design, and operations teams.
- [Alttext ai](https://composio.dev/toolkits/alttext_ai) - AltText.ai is a service that generates alt text for images automatically. It helps boost accessibility and SEO for your visual content.
- [Bannerbear](https://composio.dev/toolkits/bannerbear) - Bannerbear is an API-driven platform for generating images and videos automatically at scale. It helps businesses create custom graphics, social visuals, and marketing assets using powerful templates.
- [Canva](https://composio.dev/toolkits/canva) - Canva is a drag-and-drop design suite for creating professional graphics, presentations, and marketing materials. It makes it easy for anyone to design with beautiful templates and a vast library of elements.
- [Claid ai](https://composio.dev/toolkits/claid_ai) - Claid.ai delivers AI-driven image editing APIs for tasks like background removal, upscaling, and color correction. It helps automate and enhance image workflows with powerful, developer-friendly tools.
- [Cloudinary](https://composio.dev/toolkits/cloudinary) - Cloudinary is a cloud-based platform for managing, uploading, and transforming images and videos. It streamlines media workflows and delivers optimized assets globally.
- [Cults](https://composio.dev/toolkits/cults) - Cults is a digital marketplace for 3D printing models, connecting designers and makers. It lets creators share, sell, and discover a huge variety of printable designs easily.
- [DeepImage](https://composio.dev/toolkits/deepimage) - DeepImage is an AI-powered image enhancer and upscaler. Get higher-quality images with just a few clicks.
- [Dreamstudio](https://composio.dev/toolkits/dreamstudio) - DreamStudio is Stability AI’s platform for generating and editing images with AI. It lets you easily turn ideas into stunning visuals, fast.
- [Dynapictures](https://composio.dev/toolkits/dynapictures) - Dynapictures is a cloud-based platform for generating personalized images at scale. Instantly create hundreds of custom visuals using your data sources, like Google Sheets.
- [Excalidraw MCP](https://composio.dev/toolkits/excalidraw_mcp) - Excalidraw MCP is a no-auth MCP server for creating hand-drawn style diagrams in Excalidraw. Use it to generate visual sketches with viewport camera control and fullscreen editing.
- [Fal.ai](https://composio.dev/toolkits/fal_ai) - Fal.ai is a generative media platform offering 600+ AI models for images, video, voice, and audio. Developers use Fal.ai for fast, scalable access to cutting-edge generative AI tools.
- [Gamma](https://composio.dev/toolkits/gamma) - Gamma is an AI-powered platform for making beautiful, interactive presentations and documents. It lets anyone create and share engaging decks with minimal effort.
- [Html to image](https://composio.dev/toolkits/html_to_image) - Html to image converts HTML and CSS into images or captures web page screenshots. Instantly generate visuals from code or web content—no manual screenshots needed.
- [Imagior](https://composio.dev/toolkits/imagior) - Imagior is an AI-powered image generation platform that lets you create and customize images using dynamic templates and APIs. Perfect for businesses and creators needing fast, scalable visuals without design hassle.
- [Imejis io](https://composio.dev/toolkits/imejis_io) - Imejis io is an API-based image generation platform with powerful customization and template support. It lets you create and modify images in seconds, no manual design work required.
- [Imgix](https://composio.dev/toolkits/imgix) - Imgix is a real-time image processing and delivery service for developers. It helps you optimize, transform, and deliver images efficiently at any scale.
- [Kraken io](https://composio.dev/toolkits/kraken_io) - Kraken.io is an image optimization and compression platform. It helps you shrink image file sizes while keeping visual quality intact.
- [Logo dev](https://composio.dev/toolkits/logo_dev) - Logo.dev is an API and database for high-resolution company logos and brand metadata. Instantly fetch official logos from any domain without scraping or manual searching.

## Frequently Asked Questions

### Do I need my own developer credentials to use Mermaid Chart MCP with Composio?

No. Mermaid Chart MCP uses no-auth access, so you don't need to configure OAuth credentials, API keys, or bearer tokens. Composio handles the tool routing layer so your agents can validate Mermaid syntax, render SVG diagrams, and preview charts without custom integration code.

### Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. [Learn more](https://docs.composio.dev/tool-router/overview).

### Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. [Learn more](https://trust.composio.dev).

### What if the API changes?

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)