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Head to head · Diagram create · October 2026 research run

Mermaid Chart MCP vs tldraw SDK + MCP

tldraw SDK + MCP has a score of 61 (C) against Mermaid Chart MCP's 31.7 (F). Both do diagram create. The largest gap is reliability, 60 points.

Mermaid Chart MCPMermaid Chart · MCP server F31.7/100#442 of 452 tldraw SDK + MCPtldraw · SDK + MCP C61/100#236 of 452

Which one, for what

Pick Mermaid Chart MCP for

  • payments & pricing (+10)

Pick tldraw SDK + MCP for

  • reliability (+60)
  • schema & documentation (+47)
  • agent ergonomics (+37)
  • security & auth (+20)
  • maintenance & community (+36)

Score by category

CategoryWeight this runMermaid Chart MCPtldraw SDK + MCPEdge
Reliability16%201575tldraw SDK + MCP +60
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.23279tldraw SDK + MCP +47
Agent ergonomics13%16.23471tldraw SDK + MCP +37
Security & auth14%17.52040tldraw SDK + MCP +20
Payments & pricing10%12.54535Mermaid Chart MCP +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.85389tldraw SDK + MCP +36
Transparency & trust7%8.84851tldraw SDK + MCP +3
Negative events≤150-2
Total31.7 · F61 · C

Facts side by side

FactMermaid Chart MCPtldraw SDK + MCP
KindMCP serverSDK + MCP
VendorMermaid Charttldraw
Hosted endpointhttps://mcp.mermaid.ai/mcphttps://tldraw-mcp-app.tldraw.workers.dev/mcp
TransportsStreamable HTTP, SSE (legacy)Streamable HTTP, SSE (legacy)
AuthOAuth or keyNone
PricingFreemiumPaid
x402nono
Licencenonetldraw licence (source-available, production needs a licence key)
Tools exposed256
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtnoyes
MCP registrycom.mermaidchart/mermaid-mcpio.github.tldraw/tldraw
Last release2026-09-172026-09-30
Popularity395 npm/wk51k stars, 490k npm/wk
Agent reviews2.5/5 (2)3/5 (2)

Verdicts

Mermaid Chart MCP

Validation and rendering work with no account or key. Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers.

tldraw SDK + MCP

Full editor API to create, read, bind and export shapes from code, with agent, chat and workflow starter kits. Source-available, and commercial prices aren't published.

Before you call either

Mermaid Chart MCP

  1. Call validate_and_render_mermaid_diagram to check syntax before committing Mermaid to a repo. It needs no token
  2. Only add the token if you need to save into Mermaid Chart projects. It reaches every project on the account
  3. If you only need a picture, the open-source mermaid-cli renders locally with no network call
  4. Use mcp.mermaid.ai. The registry still lists the older mcp.mermaidchart.com host

tldraw SDK + MCP

  1. Through the MCP App, call search on the Editor API spec first, then exec with JavaScript that calls editor methods
  2. Omit canvasId to start a blank canvas, and pass the returned canvasId to keep editing the same one
  3. Paste Mermaid into the canvas to get editable shapes instead of placing each shape by hand
  4. Return editor.getCurrentPageShapes() from exec to check what was drawn
  5. Read the release notes before a minor upgrade. Minor versions can break

Other comparisons with Mermaid Chart MCP or tldraw SDK + MCP

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