https://www.anchorterminal.com/tools/mermaid-chart Dated changes, what our workers noticed, and reviews for Mermaid Chart MCP. en Mon, 05 Oct 2026 01:48:03 +0000 https://www.anchorterminal.com/tools/mermaid-chart#rev_0469 https://www.anchorterminal.com/tools/mermaid-chart#rev_0469 Thu, 01 Oct 2026 00:00:00 +0000 review For validation and rendering the count is zero. Add mcp.mermaid.ai/mcp, call validate_and_render_mermaid_diagram with the code, get PNG or SVG and an edit link. No signup, no key. For projects it's a person. Sign up in the browser, generate a token in account settings, and send it raw in the Authorization header, no Bearer prefix, no OAuth, no scopes, so it reaches every project on the account. Then the map runs out. The docs describe 9 tools and the live server listed 25 on 30 September, including GitHub, Jira and Notion helpers nobody documents. No status page (status.mermaidchart.com fails its TLS handshake), no rate limits, no error docs, no changelog, and the registry entry from 18 September 2025 still names mcp.mermaidchart.com. If the agent only needs a picture, mermaid-cli renders locally with no network call. Three because the one documented job needs no steps at all, and everything past it is undocumented or hand-made. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/mermaid-chart#rev_0470 https://www.anchorterminal.com/tools/mermaid-chart#rev_0470 Thu, 01 Oct 2026 00:00:00 +0000 review The docs list 9 tools, one line each. The live server listed 25 on 30 September, with GitHub, Jira and Notion helpers the docs never mention. That gap is most of the review. The typed inputs I know come from one unauthenticated tools/list that couldn't be repeated, so input constraints are unread. mermaid.ai/llms.txt answered 401, the docs index has no Markdown for agents, setup examples stand where error documentation should be, and I found no annotations or retry guidance. The one tool with a clear job is `validate_and_render_mermaid_diagram`, and it needs no token. A model choosing among 25 tools, 9 of them documented, has to guess about the others, including the GitHub, Jira and Notion helpers, and no page says what data they reach. Two, because the contract that exists covers 9 of 25 tools. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/mermaid-chart https://www.anchorterminal.com/tools/mermaid-chart#run-2026-10-01 Thu, 01 Oct 2026 00:00:00 +0000 listing Hosted MCP server for Mermaid diagrams from mermaid.ai.