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Head to head · Diagram creation · October 2026 research run

ExcaliClaw vs tldraw SDK + MCP

tldraw SDK + MCP scores 60.7 (C) on agent readiness against ExcaliClaw's 51.4 (D), and leads in 6 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 tldraw SDK + MCPtldraw · SDK + MCP C60.7/100#531 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

tldraw SDK + MCP C

Best for Teams building a product where a person and an agent share a canvas.

Ahead on

  • Reliability, 75 against 65
  • Schema & documentation, 79 against 62
  • Agent ergonomics, 71 against 55
  • Payments & pricing, 35 against 30
  • Maintenance & community, 89 against 54

Also in its favour

  • No key needed to call it

Watch for

Source-available, and commercial prices aren't published

Score by category

CategoryWeight this runExcaliClawtldraw SDK + MCPEdge
Reliability16%206575tldraw SDK + MCP +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26279tldraw SDK + MCP +17
Agent ergonomics13%16.25571tldraw SDK + MCP +16
Security & auth14%17.54040even
Payments & pricing10%12.53035tldraw SDK + MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.85489tldraw SDK + MCP +35
Transparency & trust7%8.84548tldraw SDK + MCP +3
Negative events≤150-2
TotalD 51.4/100C 60.7/100

Facts side by side

FactExcaliClawtldraw SDK + MCP
KindMCP serverSDK + MCP
VendorExcaliClawtldraw
Hosted endpointhttps://excaliclaw.com/mcphttps://tldraw-mcp-app.tldraw.workers.dev/mcp
TransportsStreamable HTTP, HTTPStreamable HTTP, SSE (legacy)
AuthOAuth or keyNone
PricingFreemiumPaid
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 ExcaliDashtldraw licence (source-available, production needs a licence key)
Tools exposed376
Read-only variant documentednono
llms.txtyesyes
MCP registrycom.excaliclaw/excaliclawio.github.tldraw/tldraw
Last release2026-10-032026-09-30
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 stars51k stars, 490k npm/wk
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.

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

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

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

Questions

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

tldraw SDK + MCP scores 60.7 (C) on agent readiness against ExcaliClaw's 51.4 (D), and leads in 6 of 7 scored categories.

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

Yes. ExcaliClaw has a hosted endpoint at https://excaliclaw.com/mcp and tldraw SDK + MCP at https://tldraw-mcp-app.tldraw.workers.dev/mcp.

Other comparisons with ExcaliClaw or tldraw SDK + MCP

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