Is the Mermaidchart Mermaid MCP server down?

mcp-registry/com.mermaidchart/mermaid-mcp · v1.0.0

As of 2026-10-20 00:35 UTC, the Mermaidchart Mermaid MCP server is up (it requires sign-in) with a Glimind reliability score of 85/100 (grade B). Over the last 30 days it answered 99.9% of Glimind's liveness checks. It had 6 outages in 90 days, with a median recovery of 5 minutes.

MCP server for Mermaid diagram validation and rendering

claude mcp add --transport http mermaidchart-mermaid-mcp-server https://mcp.mermaidchart.com/mcp

{
  "mcpServers": {
    "mermaidchart-mermaid-mcp-server": {
      "type": "http",
      "url": "https://mcp.mermaidchart.com/mcp"
    }
  }
}

Third-party server, listed as discovered. Review its source before installing.

Agent-readiness: B (86/100)

What to fix (4)

Get alerted

Get an email or webhook when this server's readiness drops by 10+ points, tool-poisoning text appears, or a tool breaks:

curl -X POST https://glimind.com/v1/subscriptions -H 'content-type: application/json' -d '{"tools":["mcp-registry/com.mermaidchart/mermaid-mcp"],"email":"[email protected]"}'

Agents: watch_tool({"toolId": "mcp-registry/com.mermaidchart/mermaid-mcp"}) over MCP.

Passed

• Every tool has a well-formed, typed input schema.
• Every tool declares whether it is read-only or destructive.
• No tool-poisoning patterns (hidden characters, instruction overrides, concealment, secret access, tool shadowing).
• Compact tool list (~6,360 tokens).
• Tool names are unique and portable across clients.
• 99.94% uptime over 30 days.
• No breaking contract changes in 30 days.

Largest tool definitions

• generate_ticket_dependency_tree ~559 tokens
• create_pr ~383 tokens
• validate_and_render_mermaid_diagram ~340 tokens
• generate_jira_kanban_board ~332 tokens
• search_mermaid_icons ~332 tokens

Static checks of the advertised tools/list (schema, descriptions, annotations, tool-poisoning patterns, names, size) plus observed protocol, uptime, latency and contract changes. Read-only: no tool is ever called. Weights: schema 15, docs 20, safety 15, efficiency 15, compatibility 15, protocol 5, reliability 10, stability 5. Token counts are estimates (~3.6 characters per token).

Operator? Fix these, then re-check live. Embed the readiness badge:

[![MCP agent-readiness](https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.mermaidchart%2Fmermaid-mcp.svg)](https://glimind.com/server/mcp-registry%2Fcom.mermaidchart%2Fmermaid-mcp?ref=badge)

<a href="https://glimind.com/server/mcp-registry%2Fcom.mermaidchart%2Fmermaid-mcp?ref=badge"><img src="https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.mermaidchart%2Fmermaid-mcp.svg" alt="MCP agent-readiness"></a>

.. image:: https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.mermaidchart%2Fmermaid-mcp.svg
   :target: https://glimind.com/server/mcp-registry%2Fcom.mermaidchart%2Fmermaid-mcp?ref=badge
   :alt: MCP agent-readiness

Tool-definition log

Glimind records every version of this server's tool definitions in a signed, append-only transparency log. Current manifest sha256:3041611a38844d67…, first seen 2026-10-17, included at leaf 12969 of 29,741. Version history · verify what your client received.

Tools (25)

• create_issue
• create_pr
• generate_jira_kanban_board
• generate_ticket_dependency_tree
• generate_ticket_diagram
• generate_ticket_timeline
• get_diagram_summary
• get_diagram_title
• get_issue_comments
• get_mermaid_syntax_document
• get_notion_mermaid_diagram_by_block_id
• get_notion_page_mermaid_diagrams
• get_pull_comments
• insert_notion_mermaid_diagram
• list_branches
• list_issues
• list_mermaid_files
• list_pulls
• list_repos
• list_tools
• push_file
• read_mermaid_file
• search_mermaid_icons
• update_notion_mermaid_diagram
• validate_and_render_mermaid_diagram

Compare: most reliable code servers · most reliable productivity servers · most reliable devops servers · most reliable knowledge servers · most reliable ml servers

claude mcp add --transport http glimind https://glimind.com/mcp

{
  "mcpServers": {
    "glimind": {
      "type": "http",
      "url": "https://glimind.com/mcp"
    }
  }
}

FAQ

Is the Mermaidchart Mermaid MCP server down right now?

As of 2026-10-20 00:35 UTC, the Mermaidchart Mermaid MCP server is up (it requires sign-in) with a Glimind reliability score of 85/100 (grade B). Over the last 30 days it answered 99.9% of Glimind's liveness checks. It had 6 outages in 90 days, with a median recovery of 5 minutes.

How many tools does Mermaidchart Mermaid MCP server provide?

Mermaidchart Mermaid MCP server advertises 25 tools, including create_issue, create_pr, generate_jira_kanban_board, generate_ticket_dependency_tree, generate_ticket_diagram.

How do I install Mermaidchart Mermaid MCP server?

Point your MCP client at this streamable-http endpoint: https://mcp.mermaidchart.com/mcp

Is the Mermaidchart Mermaid MCP server safe to connect to an AI agent?

Glimind scanned all 25 tool definitions for tool-poisoning patterns — hidden or invisible characters, instructions that override the model, concealment from the user, requests to read credential or MCP config files, conversation exfiltration and cross-tool shadowing — and found none. This checks what the server tells the model, not what its code does; review the source before granting access to sensitive data.

Operator of Mermaidchart Mermaid MCP server?

Status page: 90-day uptime, every outage and how long it lasted.

Claim this listing to get the Verified operator marker, a remediation checklist and owner analytics, or embed the live badge from any of the tool pages above. Maintainers: alerts, deploy attestation and monthly reports.

Status is an automated estimate from Glimind's liveness checks (handshake and tool listing only; no tool is ever called) and may lag or differ from your network. Glimind is not affiliated with this server or its operator. Operator? Request a correction or opt out at https://glimind.com/opt-out.