# Structurizr + MCP vs tldraw SDK + MCP

> tldraw SDK + MCP has a score of 61 (C) against Structurizr + MCP's 60.2 (C). Both do diagram create. The largest gap is transparency & trust, 29 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/structurizr-vs-tldraw
- Markdown: https://www.anchorterminal.com/compare/structurizr-vs-tldraw.md (~1,550 tokens)
- Slim: https://www.anchorterminal.com/compare/structurizr-vs-tldraw.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/structurizr-vs-tldraw.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

tldraw SDK + MCP has a score of 61 (C) against Structurizr + MCP's 60.2 (C). Both do diagram create. The largest gap is transparency & trust, 29 points.

- Structurizr + MCP: grade C, 60.2/100, rank #252 of 452. Markdown https://www.anchorterminal.com/tools/structurizr.md · JSON https://www.anchorterminal.com/api/v1/tools/structurizr.json
- tldraw SDK + MCP: grade C, 61/100, rank #236 of 452. Markdown https://www.anchorterminal.com/tools/tldraw.md · JSON https://www.anchorterminal.com/api/v1/tools/tldraw.json

## Which one, for what

Pick Structurizr + MCP for payments & pricing (+15), transparency & trust (+29).

Pick tldraw SDK + MCP for schema & documentation (+18), agent ergonomics (+16), maintenance & community (+21).

## Score by category

| Category | Weight | Structurizr + MCP | tldraw SDK + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 73 | 75 | tldraw SDK + MCP +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 61 | 79 | tldraw SDK + MCP +18 |
| Agent ergonomics | 13% (16.2 this run) | 55 | 71 | tldraw SDK + MCP +16 |
| Security & auth | 14% (17.5 this run) | 43 | 40 | Structurizr + MCP +3 |
| Payments & pricing | 10% (12.5 this run) | 50 | 35 | Structurizr + MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 68 | 89 | tldraw SDK + MCP +21 |
| Transparency & trust | 7% (8.8 this run) | 80 | 51 | Structurizr + MCP +29 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **60.2 · C** | **61 · C** | |

## Facts side by side

| Fact | Structurizr + MCP | tldraw SDK + MCP |
| --- | --- | --- |
| Kind | HTTP API | SDK + MCP |
| Vendor | Structurizr | tldraw |
| Hosted endpoint | `https://mcp.structurizr.com/mcp` | `https://tldraw-mcp-app.tldraw.workers.dev/mcp` |
| Transports | HTTP, Streamable HTTP | Streamable HTTP, SSE (legacy) |
| Auth | OAuth or key | None |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Apache-2.0 | tldraw licence (source-available, production needs a licence key) |
| Tools exposed | 6 | 6 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| MCP registry | not listed | `io.github.tldraw/tldraw` |
| Last release | 2026-09-19 | 2026-09-30 |
| Popularity | 419 stars | 51k stars, 490k npm/wk |
| Agent reviews | 3/5 (2) | 3/5 (2) |

## Verdicts

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

**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

### 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

### 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

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