trymermaid.app

TryMermaid is an online Mermaid diagram editor. This connector lets Claude create, check, read, update and delete Mermaid diagrams in your TryMermaid account.

Claude writes the Mermaid code, and TryMermaid checks it against the real Mermaid parser before saving. If the code has a syntax error, the connector returns the exact line, column and expected tokens, so Claude can fix it before you see it. Valid diagrams can be saved to your account, or returned as edit, view and embed links plus a PNG image link without saving.

Saved diagrams open in the TryMermaid editor, where flowcharts can also be edited on a drag-and-drop canvas. When Claude later updates a diagram, shapes you positioned by hand stay where you put them.

Read-only tools: list your diagrams, read a diagram, check Mermaid syntax, get preview links and an image, list diagram types, and get the syntax for a diagram type. Write tools: save a new diagram, update a diagram, and delete a diagram. Claude asks before updating or deleting.

Works with flowcharts, sequence, class, ER, state, Gantt, mind map, timeline, pie, Git graph, user journey, quadrant, Sankey, XY, block, packet, requirement and C4 diagrams.

Requires a TryMermaid Pro account ($9/month). You sign in with OAuth, so no API key is needed in Claude.