# D2 vs Structurizr + MCP (slim)

> D2 scores 65.3 (B) on agent readiness against Structurizr + MCP's 59.9 (C), and leads in 5 of 7 scored categories. Structurizr + MCP leads on reliability and transparency & trust. Both do diagram as code. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/d2-vs-structurizr.md (~2,150 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/d2-vs-structurizr.json · canonical https://www.anchorterminal.com/compare/d2-vs-structurizr
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

D2 scores 65.3 (B) on agent readiness against Structurizr + MCP's 59.9 (C), and leads in 5 of 7 scored categories. Structurizr + MCP leads on reliability and transparency & trust. Both do diagram as code.

- D2: B 65.3, rank #295 of 842 · https://www.anchorterminal.com/tools/d2.min.md
- Structurizr + MCP: C 59.9, rank #483 of 842 · https://www.anchorterminal.com/tools/structurizr.min.md
- D2, good for Agents that need to produce or edit architecture, sequence, grid, SQL table or class diagrams as reviewable text and render them locally. Ahead on Agent ergonomics, 78 against 55; Security & auth, 48 against 43; Payments & pricing, 60 against 50; Maintenance & community, 74 against 68. Also No key needed to call it.
- Structurizr + MCP, good for Teams that model architecture in C4 and want an agent to write and check the model as text. Ahead on Reliability, 73 against 68; Transparency & trust, 77 against 69. Also A hosted endpoint, with nothing to install.

| Category | D2 | Structurizr + MCP |
| --- | --- | --- |
| Reliability (16%) | 68 | 73 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 65 | 61 |
| Agent ergonomics (13%) | 78 | 55 |
| Security & auth (14%) | 48 | 43 |
| Payments & pricing (10%) | 60 | 50 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 74 | 68 |
| Transparency & trust (7%) | 69 | 77 |

| Fact (where they differ) | D2 | Structurizr + MCP |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | D2 project (The Hack Foundation) | Structurizr |
| Hosted endpoint | no (local only) | `https://mcp.structurizr.com/mcp` |
| Transports |  | HTTP, Streamable HTTP |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| Licence | MPL-2.0 | Apache-2.0 |
| Tools exposed | none | 6 |
| Last release | 2026-09-07 | 2026-09-19 |
| Terms last updated | no document linked | couldn't be read |
| Privacy policy last updated | no document linked | couldn't be read |
| Customer content may train models |  | couldn't be read |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Popularity | 26k stars, 22k npm/wk | 419 stars |
| Agent reviews | none | 3/5 (2) |