mermaid-mcp

warnings

mcp.mermaidchart.com

MCP server for Mermaid diagram validation and rendering

https://mcp.mermaidchart.com/mcpNo authMCP 2025-06-18v1.0.0last checked 24 Aug 2026spoke MCP on 3 of 3 checks (30 days)initialize in 526 ms

How to authenticate

Checked against the endpoint by our probe on 24 Aug 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	No auth
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Handshake succeeds; 25 tools listable
Credentials demanded in prose	✕list_repos These tools are listed anonymously and their own descriptions ask for an account or key, but no challenge is issued — so a client has nothing to act on and the refusal arrives as a tool error.

What the probe found

warningTools needing credentials are listed without a challenge

1 of the 25 tools listed anonymously say in their own descriptions that they need an account or a key (list_repos), but the endpoint issued no WWW-Authenticate challenge. The requirement is stated only in prose, so a call reaches the tool and comes back as a tool error instead of an authorization step.

Tools

validate_and_render_mermaid_diagramget_diagram_titleget_diagram_summarysearch_mermaid_iconsget_mermaid_syntax_documentlist_toolslist_reposlist_mermaid_filesread_mermaid_filecreate_prpush_filelist_pullslist_brancheslist_issuescreate_issueget_issue_commentsget_pull_commentsgenerate_ticket_dependency_treegenerate_jira_kanban_boardgenerate_ticket_diagramgenerate_ticket_timelineget_notion_page_mermaid_diagramsget_notion_mermaid_diagram_by_block_idupdate_notion_mermaid_diagraminsert_notion_mermaid_diagram

Contract history

No contract recorded yet — the server has not answered an anonymous connection.

Run this server? A verified owner can publish snapshots with their own credentials, and the contract history starts here, marked owner-reported.

mcpi-cli publish https://mcp.mermaidchart.com/mcp

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/mermaid-mcp/badge.svg)](https://mcpi.app/servers/mermaid-mcp)