Koskamo

Mermaid MCP Server

An MCP server that provides tools for validating, rendering, and managing Mermaid diagrams. It integrates with the Mermaid Chart platform to allow users to create, read, update, and delete diagrams, as well as access AI-powered diagram repair and icon search utilities for architecture diagrams.

Endpoint and access

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

Mermaid MCP Server logo, by Mermaid ChartVendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-07Operated by Mermaid Chart
You need:Login to your Mermaid Chart accountGo to Settings → API TokensGenerate a new token
MCP endpoint (Streamable HTTP)
https://mcp.mermaidchart.com/mcp
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to mermaidchart.com ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Validate syntax and render Mermaid diagrams as PNG images
  • Create, read, update, and delete diagrams in Mermaid Chart
  • Generate professional titles and summaries for diagrams
  • Search for AWS, Azure, GCP, and FontAwesome icons

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
58 ms
95th percentile latency
58 ms

Maintenance history

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

  • · probe · passed · 58 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 http mermaid-mcp-server https://mcp.mermaidchart.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add mermaid-mcp-server --url https://mcp.mermaidchart.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable mermaid-mcp-server in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "mermaid-mcp-server": {
      "url": "https://mcp.mermaidchart.com/mcp"
    }
  }
}

Cline

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

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start mermaid-mcp-server and inspect its tools.
VS Code configuration
{
  "servers": {
    "mermaid-mcp-server": {
      "type": "http",
      "url": "https://mcp.mermaidchart.com/mcp"
    }
  }
}

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 http mermaid-mcp-server https://mcp.mermaidchart.com/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://mcp.mermaidchart.com/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "mermaid-mcp-server": {
      "serverUrl": "https://mcp.mermaidchart.com/mcp"
    }
  }
}

Let your agent find its tools

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Do you run Mermaid MCP Server?

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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