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Mermaid MCP Server

Official Mermaid diagram generation MCP server

ToolsTools
17
Last updatedLast Updated
Jun 14, 2026
CategoryCategory
All
Install with Willow
Claude
Install
✓Enterprise-grade security
✓SSO & authentication ready
✓Full governance & audit logs

What is the Mermaid MCP Server?

The Mermaid MCP server gives AI agents structured, permission-aware access to Mermaid through the Model Context Protocol. With 17 pre-built actions, agents can read, create, and update Mermaid data on behalf of authorized users.

Willow ships the Mermaid MCP server as part of an enterprise control plane. Every call runs behind SSO (Okta, Azure AD), enforces RBAC and least-privilege at runtime, writes to a full audit trail, and integrates with Splunk and Loki for SIEM visibility. Connect from Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code, n8n, or any custom agent. Install once, distribute org-wide, and see exactly how Mermaid is being used by every AI agent in your stack.

Tools

Tool

validate_and_render_mermaid_diagram

SIMPLE RENDER TOOL - Renders Mermaid diagrams directly (Mermaid automatically validates during rendering). If successful, returns diagram image. If Mermaid validation fails, returns error details for fixing. One tool, one call, simple workflow.
Tool

get_diagram_title

Generate a descriptive title for a Mermaid diagram based on its content. This tool analyzes the diagram structure and content to suggest an appropriate title.
Tool

get_diagram_summary

Generate a concise summary for a Mermaid diagram based on its content. This tool provides prompts for the LLM to generate a brief summary (2-4 sentences) highlighting the primary flow, key decisions, and outcomes.
Tool

search_mermaid_icons

Search for available Mermaid icons by provider or name. Returns icons in ready-to-use format with provider prefixes (e.g., 'aws:arch-amazon-ec2'). PERFORMANCE TIP: For faster searches, start with limit=10 and specific queries. If no suitable icons found, increase limit and retry. Supports AWS, Azure, GCP, and FontAwesome icon sets.
Tool

get_mermaid_syntax_document

Get comprehensive syntax documentation and examples for a specific Mermaid diagram type. Returns the official Mermaid.js documentation with syntax rules, examples, and usage instructions for the requested diagram type.
Tool

list_tools

Lists all available MCP servers and their tools in the workspace.
Tool

list_repos

List GitHub repositories for the authenticated user, or for an organization when `org` is set. REQUIRES: `Github-Token` header (HTTP) or `GITHUB_TOKEN` / `GH_TOKEN` in the server environment.
Tool

list_mermaid_files

List .mmd Mermaid files in a GitHub repository (code search with tree fallback). REQUIRES: `Github-Token` header (HTTP) or GITHUB_TOKEN / GH_TOKEN.
Tool

read_mermaid_file

Read a single .mmd file from a GitHub repository. Only paths ending in .mmd are allowed. REQUIRES: `Github-Token` header (HTTP) or GITHUB_TOKEN / GH_TOKEN.
Tool

create_pr

Create a new branch (git ref), one commit from the base tree with your file changes, then open a pull request in the same repository. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN with `contents: write` (and no existing branch with the same `headBranch` name).
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Set Up Your Mermaid MCP Server in Minutes

Add the following configuration to your MCP client. Authentication is handled via OAuth. Compatible with Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code, n8n, and any MCP-compatible agent.

Claude Desktop

claude_desktop_config.json
{
  "mcpServers": {
    "willow-mermaid": {
      "type": "http",
      "url": "https://<org>.mcp-s.com/mcp/mcp/mermaid"
    }
  }
}

Cursor

.cursor/mcp.json
{
  "mcpServers": {
    "willow-mermaid": {
      "type": "http",
      "url": "https://<org>.mcp-s.com/mcp/mcp/mermaid"
    }
  }
}

Claude Code

CLI
claude mcp add willow-mermaid --transport http https://<org>.mcp-s.com/mcp/mcp/mermaid

n8n

HTTP Request Node
{
  "url": "https://<org>.mcp-s.com/mcp/mcp/mermaid",
  "method": "POST"
}

Or click "Install with Willow" above to set up automatically with SSO and RBAC preconfigured.

Enterprise Governance for Mermaid

Willow adds the layer Mermaid and every other SaaS doesn't ship out of the box: every call runs behind SSO (Okta, Azure AD), enforces RBAC and least-privilege at runtime, writes to full audit logs, and detects shadow AI usage across your stack. One MCP gateway. Any agent. Every tool.

Mermaid MCP Server FAQ

What is the Mermaid MCP server?

The Mermaid MCP server is a Model Context Protocol implementation that lets AI agents like Claude, Cursor, and ChatGPT read and write Mermaid data through a standardized interface. Willow hosts and governs this server so enterprises can roll it out without a security review backlog.

How is Willow's Mermaid MCP server different from the official one?

The official Mermaid MCP server is scoped to a single user's account and does not include enterprise governance. Willow's version adds SSO, RBAC, audit logging, shadow AI detection, and centralized control over which actions agents can take across the entire org.

Which AI clients work with the Mermaid MCP server?

Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code with MCP support, n8n, and any custom agent built with OpenAI Agents SDK, LangChain, Vercel AI SDK, or Anthropic SDK.

Is the Mermaid MCP server secure? How does Willow handle authentication?

Every call runs behind your existing SSO (Okta, Azure AD). Per-user OAuth scopes the agent to exactly what that user can do in Mermaid, nothing more. No credentials reach the LLM. Every action writes to an audit trail.

Can I limit which Mermaid actions agents can take?

Yes. Willow lets you scope agents to specific actions, specific projects, or specific environments. Toggle actions on or off in the dashboard, or enforce policy via infrastructure-as-code through GitHub.

How do I detect shadow Mermaid MCP servers in my org?

Willow's browser extension and discovery service surface unmanaged MCP servers, skills, and AI agents across the org. If a developer installed an unapproved Mermaid MCP locally, you'll see it.

What does the Mermaid MCP server cost?

Pricing depends on org size and deployment model (SaaS, dedicated cloud, self-host). See withwillow.ai/pricing or contact sales for a quote.

How do I install the Mermaid MCP server with Willow?

Install via the Willow Connect Panel in one click, or paste the JSON snippet above into your Claude Desktop, Cursor, or Claude Code config. SSO and RBAC inherit from your existing Willow setup.

Compare Willow MCP Gateway

See how Willow stacks up against other MCP platforms on governance, security, and enterprise readiness.

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Mermaid MCP Server | Willow