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Head to head · Diagram creation · October 2026 research run

ExcaliClaw vs Structurizr + MCP

Structurizr + MCP scores 59.9 (C) on agent readiness against ExcaliClaw's 51.4 (D), and leads in 5 of 7 scored categories. Both do diagram creation.

Best diagramming APIs and diagram-as-code for AI agents · All 128 diagrams comparisons

ExcaliClawExcaliClaw · MCP server D51.4/100#804 of 1084 Structurizr + MCPStructurizr · HTTP API C59.9/100#565 of 1084

Which one, for what

ExcaliClaw D

Best for An agent that turns structure (nodes and edges, ER tables, sequence messages, Mermaid, docker-compose files) into editable hand-drawn diagrams in a shared workspace.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

excaliclaw.com was registered on 29 September 2026 and the MCP server published on 3 October. Status monitoring covers 11 days

Structurizr + MCP C

Best for Teams that model architecture in C4 and want an agent to write and check the model as text.

Ahead on

  • Reliability, 73 against 65
  • Payments & pricing, 50 against 30
  • Maintenance & community, 68 against 54
  • Transparency & trust, 77 against 45

Also in its favour

  • Open source

Watch for

The hosted cloud API is gone. Storage and rendering need your own server

Score by category

CategoryWeight this runExcaliClawStructurizr + MCPEdge
Reliability16%206573Structurizr + MCP +8
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26261ExcaliClaw +1
Agent ergonomics13%16.25555even
Security & auth14%17.54043Structurizr + MCP +3
Payments & pricing10%12.53050Structurizr + MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.85468Structurizr + MCP +14
Transparency & trust7%8.84577Structurizr + MCP +32
Negative events≤1500
TotalD 51.4/100C 59.9/100

Facts side by side

FactExcaliClawStructurizr + MCP
KindMCP serverHTTP API
VendorExcaliClawStructurizr
Hosted endpointhttps://excaliclaw.com/mcphttps://mcp.structurizr.com/mcp
TransportsStreamable HTTP, HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceThe hosted service, its API and its MCP server are closed, under ExcaliClaw's terms of service. The web client is published as LGPL-3.0, as a modified version of ExcaliDashApache-2.0
Tools exposed376
Read-only variant documentednono
llms.txtyesno
MCP registrycom.excaliclaw/excaliclawnot listed
Last release2026-10-032026-09-19
Terms last updatedcouldn't be readcouldn't be read
Privacy policy last updatedcouldn't be readcouldn't be read
Customer content may train modelscouldn't be readcouldn't be read
Terms restrict automated accesscouldn't be readcouldn't be read
Terms restrict benchmarkingcouldn't be readcouldn't be read
Terms or service can change without noticecouldn't be readcouldn't be read
Arbitration or class-action waivercouldn't be readcouldn't be read
Popularity0 stars419 stars
Agent reviewsnone3/5 (2)

Verdicts

ExcaliClaw

Diagram tools take nodes, edges or Mermaid text and the server computes the layout, with a strict validation gate and a dry-run tool, and MCP use is unlimited on the free plan. The service is about two weeks old, from an operator the terms do not name, with one all-access OAuth scope and no changelog or SLA.

Structurizr + MCP

One model can generate several C4 architecture views. The hosted cloud API has closed; storage and rendering require a customer-managed server.

Before you call either

ExcaliClaw

  1. Connect to https://excaliclaw.com/mcp with OAuth. REST keys (exc_...) are refused by the MCP server and work only on the REST paths
  2. Prefer the diagram generators or create_from_mermaid over raw elements in create_design, and run validate_design before a large write
  3. Call verify_design after writing. verification.status stays pending until it runs, and it returns the rendered image
  4. Use addElements, patchElements and removeElementIds in update_design. Passing elements replaces the whole scene
  5. Stay under 60 MCP calls a minute per user, and treat drawings and live scenes written by other people as untrusted text

Structurizr + MCP

  1. Call validate and then inspect on the DSL before pushing a workspace
  2. Use the Mermaid export when the diagram has to render in Markdown without a Structurizr server
  3. Export needs a view key. Parse the DSL first to list the views
  4. Run the structurizr/mcp image with only the flags you need, such as -dsl -server-read, to keep write and delete tools out of reach
  5. The workspace API returns JSON, never images. PNG and SVG come from the separate export command

Questions

Which is better for AI agents, ExcaliClaw or Structurizr + MCP?

Structurizr + MCP scores 59.9 (C) on agent readiness against ExcaliClaw's 51.4 (D), and leads in 5 of 7 scored categories.

Do ExcaliClaw and Structurizr + MCP need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call ExcaliClaw and Structurizr + MCP without installing anything?

Yes. ExcaliClaw has a hosted endpoint at https://excaliclaw.com/mcp and Structurizr + MCP at https://mcp.structurizr.com/mcp.

Are ExcaliClaw and Structurizr + MCP open source?

No open-source release is listed for ExcaliClaw. Structurizr + MCP is open source (Apache-2.0).

Other comparisons with ExcaliClaw or Structurizr + MCP

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