Koskamo

Mermaid Chart MCP

An official MCP server for Mermaid Chart that allows AI agents to validate, render, and manage Mermaid diagrams. It supports creating, reading, updating, and deleting diagrams in the cloud, validating syntax, generating PNGs, and using AI for diagram repair. Authentication with an API token unlocks full CRUD operations and AI features, while unauthenticated access provides basic validation and rendering tools.

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

Mermaid Chart MCP logo, by Mermaid ChartVendor evidenceLegacy SSEOAuth sign-inEndpoint checked 2026-11-01Operated by Mermaid Chart
You need:Login to your Mermaid Chart accountGo to Settings → API TokensGenerate a new token
MCP endpoint (Legacy SSE)
https://mcp.mermaidchart.com/sse
Vendor documentation

What you can do with it

  • Validate Mermaid diagram syntax and render as PNG
  • Create, update, and delete diagrams in Mermaid Chart
  • Generate professional titles and summaries for diagrams
  • Search for icons to enhance architecture diagrams

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: com.mermaidchart/mermaid-mcp@1.0.0Source repository
Maintenance checked

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
74 ms
95th percentile latency
74 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 74 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport sse mermaid-chart-mcp https://mcp.mermaidchart.com/sse

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "mermaid-chart-mcp": {
      "type": "sse",
      "url": "https://mcp.mermaidchart.com/sse",
      "disabled": false
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport sse mermaid-chart-mcp https://mcp.mermaidchart.com/sse

Let your agent find its tools

Find servers like Mermaid Chart MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

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Do you run Mermaid Chart MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

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