# Diagramming APIs and diagram-as-code for AI agents (slim)

> 10 diagramming listings ranked by the Anchor benchmark. Leader Miro API + MCP (B). Tools an agent can use to draw architecture, flow and sequence diagrams, through a REST API, an MCP server, an SDK or a diagram-as-code format. Compared on how the diagram is described, whether it stays editable, export formats and what it costs.

- Full: https://www.anchorterminal.com/categories/diagramming.md (~2,850 tokens) · this version ~530 tokens · JSON https://www.anchorterminal.com/categories/diagramming.json · canonical https://www.anchorterminal.com/categories/diagramming
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

- Tools: 10 · agent-ready (BB+): 0 · accept x402: 0 · JSON: https://www.anchorterminal.com/api/v1/tools.json · by capability: https://www.anchorterminal.com/api/v1/capabilities.json
- Capabilities: diagram.create, diagram.as-code, diagram.edit, diagram.export, diagram.architecture

| # | Tool | Grade | Score | Confidence | x402 | Auth | Where | Slim |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 175 | Miro API + MCP | B | 65.3 | medium | no | OAuth | hosted | https://www.anchorterminal.com/tools/miro.min.md |
| 219 | draw.io + MCP | B | 62.4 | medium | no | None | hosted + local | https://www.anchorterminal.com/tools/drawio.min.md |
| 236 | tldraw SDK + MCP | C | 61 | medium | no | None | hosted | https://www.anchorterminal.com/tools/tldraw.min.md |
| 238 | Lucid API + MCP | C | 60.9 | medium | no | OAuth or key | hosted | https://www.anchorterminal.com/tools/lucid.min.md |
| 252 | Structurizr + MCP | C | 60.2 | medium | no | OAuth or key | hosted | https://www.anchorterminal.com/tools/structurizr.min.md |
| 255 | Diagrams.so API + MCP | C | 60.1 | medium | no | OAuth or key | hosted + local | https://www.anchorterminal.com/tools/diagrams-so.min.md |
| 341 | Whimsical MCP | D | 52.7 | medium | no | OAuth | hosted | https://www.anchorterminal.com/tools/whimsical.min.md |
| 427 | Eraser API + MCP | E | 38.7 | medium | no | OAuth or key | hosted + local | https://www.anchorterminal.com/tools/eraser.min.md |
| 432 | Cloudviz API | F | 37.9 | medium | no | API key | hosted | https://www.anchorterminal.com/tools/cloudviz.min.md |
| 442 | Mermaid Chart MCP | F | 31.7 | medium | no | OAuth or key | hosted | https://www.anchorterminal.com/tools/mermaid-chart.min.md |