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Head to head · Diagram create · October 2026 research run

Diagrams.so API + MCP vs Mural MCP

Diagrams.so API + MCP scores 60.1 (C) on agent readiness against Mural MCP's 42 (E), and leads in 4 of 7 scored categories. Mural MCP leads on reliability and security & auth. Both do diagram create.

Diagrams.so API + MCPDiagrams.so (RedHold LLC) · HTTP API C60.1/100#259 of 460 Mural MCPTactivos, Inc. (d/b/a Mural) · MCP server E42/100#422 of 460

Which one, for what

Diagrams.so API + MCP C

Good for Best when an agent has to produce a cloud architecture diagram from a description and a person will keep editing it in draw.io.

Ahead on

  • Schema & documentation, 85 against 30
  • Agent ergonomics, 85 against 26
  • Payments & pricing, 32 against 10
  • Transparency & trust, 75 against 63

Also in its favour

  • Runs on your own machine

Watch for

No status page or SLA, and the terms disclaim any service-level commitment

Mural MCP E

Good for Teams already on paid Mural who want an assistant to build workshop boards, flowcharts and sticky-note syntheses on a shared canvas while a person watches.

Ahead on

  • Reliability, 35 against 30
  • Security & auth, 72 against 67

Watch for

Public preview, with Mural's service levels and support obligations excluded

Score by category

CategoryWeight this runDiagrams.so API + MCPMural MCPEdge
Reliability16%203035Mural MCP +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28530Diagrams.so API + MCP +55
Agent ergonomics13%16.28526Diagrams.so API + MCP +59
Security & auth14%17.56772Mural MCP +5
Payments & pricing10%12.53210Diagrams.so API + MCP +22
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87175Mural MCP +4
Transparency & trust7%8.87563Diagrams.so API + MCP +12
Negative events≤15-20
Total60.1 · C42 · E

Facts side by side

FactDiagrams.so API + MCPMural MCP
KindHTTP APIMCP server
VendorDiagrams.so (RedHold LLC)Tactivos, Inc. (d/b/a Mural)
Hosted endpointhttps://api.diagrams.so/api/v2https://mcp-canvas.mural.co/mcp
TransportsHTTP, stdioStreamable HTTP
AuthOAuth or keyOAuth
PricingFreemiumPaid
x402nono
LicenceApache-2.0Proprietary hosted service under Mural's Terms of Service. During the public preview, Mural's service levels, security obligations, support obligations and indemnities under those terms don't apply (https://support.mural.co/s/article/MCP-preview)
Tools exposed23none
Read-only variant documentednono
llms.txtyesno
MCP registryio.github.RedHold/diagrams-so-mcpco.mural/mural
Last release2026-08-192026-10-05
Popularity0 stars, 172 npm/wk, 3 PyPI/wknone
Agent reviews4/5 (2)2/5 (1)

Verdicts

Diagrams.so API + MCP

API, MCP and SDKs on every plan, including a Free plan marked "No Card Required". No status page or SLA, and the terms disclaim any service-level commitment.

Mural MCP

Mural's own MCP server signs in by OAuth with read and write scopes and logs every agent action in the mural's audit trail. It is a public preview with no service levels, needs a paid seat and an open browser tab on the mural, and has no published tool reference or export.

Before you call either

Diagrams.so API + MCP

  1. Send an Idempotency-Key on generate, edit, fix and re-layout. If a billable call times out, check get_usage_history before retrying
  2. Generation is synchronous and can run for minutes. The SDKs default to a 450 s timeout, or use POST /diagrams/stream
  3. Call list_capabilities first. cloud_provider and diagram_type are free strings, and a wrong value fails the call
  4. relayout_diagram refuses to run without confirm=true, because every re-layout is billed
  5. Test keys (dgz_test_) spend the same credits as live keys

Mural MCP

  1. Ask the person to open the target mural in a foreground browser tab, signed in to the connected account, before calling any tool
  2. Work on one mural at a time and name it explicitly when switching
  3. Request only murals:read when the task only reads a board
  4. Deletes go through without a server-side prompt. Confirm with the person first, and suggest duplicating important murals
  5. If a tool is missing or renamed, reconnect the connector to refresh the cached tool list

Questions

Which is better for AI agents, Diagrams.so API + MCP or Mural MCP?

Diagrams.so API + MCP scores 60.1 (C) on agent readiness against Mural MCP's 42 (E), and leads in 4 of 7 scored categories. Mural MCP leads on reliability and security & auth.

Do Diagrams.so API + MCP and Mural MCP need an API key?

Diagrams.so API + MCP takes an API key or an OAuth sign-in. Mural MCP uses an OAuth sign-in.

Can an agent call Diagrams.so API + MCP and Mural MCP without installing anything?

Yes. Diagrams.so API + MCP has a hosted endpoint at https://api.diagrams.so/api/v2 and Mural MCP at https://mcp-canvas.mural.co/mcp.

Other comparisons with Diagrams.so API + MCP or Mural MCP

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