# AI Diagram Maker MCP (slim)

> AI Diagram Maker MCP is an MIT-licensed MCP server, hosted or run with npx, that sends text, JSON, ASCII art, images or Mermaid to the AI Diagram Maker service and returns a D2 software diagram with an edit link.

- Full: https://www.anchorterminal.com/tools/ai-diagram-maker-mcp.md (~6,650 tokens) · this version ~1,530 tokens · JSON https://www.anchorterminal.com/tools/ai-diagram-maker-mcp.json · canonical https://www.anchorterminal.com/tools/ai-diagram-maker-mcp
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07 · pricing https://www.anchorterminal.com/tools/ai-diagram-maker-mcp#pricing · reviews https://www.anchorterminal.com/tools/ai-diagram-maker-mcp#reviews
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

**E · 43.8/100 · rank #1225 of 1486 · #13 in Diagramming · not agent-ready · confidence medium**


Assessment: Five compact, typed tools turn text, JSON, ASCII art, images or Mermaid into an editable D2 diagram, and the API documents its error and rate-limit responses. There has been no release since 10 April 2026, there is no status page or llms.txt, and the API key opens the whole account with no scopes.

## Facts

- Kind: MCP server · vendor: AI Diagram Maker (Rajasekar Elango) · category: Diagramming · legal entity: not named · provenance 42/100
- Endpoint: `https://mcp.aidiagrammaker.com/mcp` (Streamable HTTP, stdio)
- Auth: API key · pricing: Freemium · x402: no · licence: MIT for the MCP server. The AI Diagram Maker service it calls is closed, under terms last updated 24 September 2025
- Benchmark probes: not run yet, so Performance is pending
- Live, from our pollers (not part of the score): down at 2026-11-07 17:49 UTC · uptime 30 days 0.0% (195 probes) · p50 n/a · p95 n/a over 24 hours
- Surface listed: The ai-diagram-maker-mcp server (3.0.8), hosted at mcp.aidiagrammaker.com or run with npx, and the generate API it calls, read from a shallow clone of the repository, npm, the MCP registry and www.aidiagrammaker.com on 6 November 2026. No account was made and the package was not run
- Inputs: Natural-language text, JSON, ASCII art, an image (public URL or base64 data URI) or a Mermaid definition, with an optional styling prompt and icons
- Diagram types: flowchart, sequence, erd, system_architecture, network_architecture, uml, mindmap and workflow in the code; the README lists five
- Plans: Basic free (50 credits a month), Plus $10 a month (250), Max $20 a month (500). One credit is 1,000 tokens; credits reset monthly and can't be bought separately
- Operator: The terms and privacy policy name only AI Diagram Maker, with a Gmail contact address. The npm package's author is Rajasekar Elango, with an aidiagrammaker.com address
- Prices: Plus plan $10 per month (plan); Max plan $20 per month (plan)

- Scores: Reliability 30, Performance pending, Schema & documentation 75, Agent ergonomics 66, Security & auth 45, Payments & pricing 20, Task success pending, Maintenance & community 17, Transparency & trust 35 · total over the 7 assessed categories
- Why: Reliability, Hosted lines, because every tool call is generated on the AI Diagram Maker service, through the hosted endpoint or the npx server. · Schema & documentation, All five tools have zod input schemas in src/tools, and the repository ships an OpenAPI 3 file for POST /api/v2/diagrams/generate (25). · Agent ergonomics, Five compact tools (25). · Security & auth, Several named API keys per account, shown once and deactivated or deleted in Settings with a confirmation step, sent in a header, never a qu… · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, Last release v3.0.8, published to npm on 10 April 2026, 210 days before this check (0). · Transparency & trust, The MCP server is MIT (package.json and LICENSE, added 18 March 2026).
- Sources: 10, open questions: 4, both in the full twin
- Capabilities: diagram.create, diagram.architecture, diagram.as-code, diagram.export
- JSON: https://www.anchorterminal.com/api/v1/tools/ai-diagram-maker-mcp.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/ai-diagram-maker-mcp.svg` or a link to https://www.anchorterminal.com/tools/ai-diagram-maker-mcp from a page on aidiagrammaker.com or one of its subdomains, or the README at the root of github.com/erajasekar/ai-diagram-maker-mcp, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.
- Support: Discord https://discord.gg/jadEKsDY; aidiagrammaker@gmail.com; https://www.aidiagrammaker.com/contact; https://www.aidiagrammaker.com/user-guide; more in the full twin

## Before you call it

1. Send the key in the `X-ADM-API-Key` header to https://mcp.aidiagrammaker.com/mcp, never in the URL
2. Pick `diagramType` from the enum when the user names one; leave it out to let the service choose
3. On a 402 stop and tell the user credits are gone; they reset monthly and can't be topped up
4. On a 429 wait for `retryAfter` seconds before the next call
5. Give the user the returned diagram link so they can edit it, since the tools can't revise an existing diagram

## Connect

```bash
ADM_API_KEY=your_api_key npx ai-diagram-maker-mcp@latest
```

```bash
claude mcp add ai-diagram-maker -t stdio -e ADM_API_KEY=<api_key> -- npx -y ai-diagram-maker-mcp@latest
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/ai-diagram-maker-mcp

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| draw.io + MCP | B | 64.5 | diagram.create, diagram.as-code, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/drawio.min.md |
| PlantUML | B | 62.5 | diagram.as-code, diagram.create, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/plantuml.min.md |
| D2 | B | 62.3 | diagram.as-code, diagram.create, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/d2.min.md |
| Structurizr + MCP | C | 61 | diagram.create, diagram.as-code, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/structurizr.min.md |
| Kroki | D | 52.9 | diagram.as-code, diagram.create, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/kroki.min.md |


## Panel reviews (0, desk reviews from public material, no calls made)