MCP server

Agentic Mermaid

io.github.adewale/agentic-mermaid

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Render, verify, describe, and safely edit Mermaid diagrams through MCP.

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

9

Token cost

About 52,033 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http agentic-mermaid https://agentic-mermaid.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.agentic-mermaid]
url = "https://agentic-mermaid.dev/mcp"

Gemini CLI

{"mcpServers":{"agentic-mermaid":{"httpUrl":"https://agentic-mermaid.dev/mcp"}}}

Cursor

{"mcpServers":{"agentic-mermaid":{"url":"https://agentic-mermaid.dev/mcp"}}}

VS Code

{"servers":{"agentic-mermaid":{"type":"http","url":"https://agentic-mermaid.dev/mcp"}}}

Antigravity

agy mcp add agentic-mermaid https://agentic-mermaid.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"agentic-mermaid","server_url":"https://agentic-mermaid.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"agentic-mermaid","server_url":"https://agentic-mermaid.dev/mcp"}

Tools

• build ~237 tokens
  Author a new Mermaid diagram from blank by folding a list of structured ops over an empty diagram of `family`. The declarative counterpart to hand-writing source. Returns the same envelope as `mutate`: { ok, family, source, verify } or { ok:false, family, opIndex, error }. Call `describe_sdk` for th
• describe ~180 tokens
  Describe a Mermaid diagram. format=text returns { ok, text } with one or two summary sentences; format=json returns { ok, tree } with the AX tree; format=facts returns { ok, facts } with deterministic semantic fact lines for machine checking (for example edge A -> B : label, member Duck +quack()).
• describe_sdk ~242 tokens
  Return version-matched mutation operations for one diagram family. Use detail=signatures for the compact op menu or detail=fields (default) for exact field types, required flags, enum values, defaults, and constraints. Call this before build, mutate, or execute when the family schema is not already
• execute ~675 tokens
  Run JavaScript in an isolated sandbox; return a value. One call composes edits. Submit JavaScript; declaration types are guidance. No promises, async/await, dynamic import, or type annotations. Hosted note: execute runs in an on-demand isolate and costs more than the direct render_svg/render_ascii/r
• mutate ~345 tokens
  Apply a list of structured edit ops to an existing Mermaid `source` and return the edited diagram. This is the declarative counterpart to `execute`: plain JSON in, plain JSON out, no sandbox. Prefer it for straightforward edits; reserve `execute` for logic the ops don't express. Returns { ok, family
• render_ascii ~16580 tokens
  Render a Mermaid source string to text. Returns { ok, text }. useAscii true → plain ASCII (+,-,|); false/absent → Unicode box drawing (┌,─,│). targetWidth sets a hard terminal display-cell bound; impossible bounds return a typed error.
• render_png ~16936 tokens
  Rasterize a Mermaid source string to PNG. Returns { ok, png_base64 }. Hosted rendering uses resvg-wasm with bundled fonts; bytes may differ from the local napi renderer, so hosted PNG is a convenience surface, not part of the byte-determinism contract. For file/URL artifacts use the local stdio serv
• render_svg ~16662 tokens
  Render a Mermaid source string to themeable SVG. Returns { ok, svg }. Layout is deterministic: identical input produces identical geometry. The hosted boundary forces security:'strict' and embedFontImport:false.
• verify ~176 tokens
  Parse and verify a Mermaid diagram without rendering it. Returns { ok, family, summary, warnings, layout: { bounds, nodes, edges } } for valid diagrams and { ok: false, errors } for parse failures. `family` is the detected diagram family and `summary` a one-line description — check them: ok:true onl

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