# Eraser API + MCP (slim)

> Docs and diagrams workspace for engineers.

- Full: https://www.anchorterminal.com/tools/eraser.md (~5,950 tokens) · this version ~1,430 tokens · JSON https://www.anchorterminal.com/tools/eraser.json · canonical https://www.anchorterminal.com/tools/eraser
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

**E · 38.7/100 · rank #427 of 452 · #7 in Diagramming · not agent-ready · confidence medium**


Assessment: Hosted MCP with OAuth and 41 tools, including `manually_` tools that skip the AI when the agent writes the diagram code. No status page, rate limits, SLA or changelog.

## Facts

- Kind: HTTP API · vendor: Eraser · category: Diagramming · legal entity: Eraser Labs, Inc. · provenance 70/100
- Endpoint: `https://app.eraser.io/api` (HTTP, Streamable HTTP, stdio)
- Auth: OAuth or key · pricing: Freemium · x402: no · licence: unknown
- Probe metrics: not measured yet (probes haven't run)
- Free tier: Free plan with 3 files and 3 AI diagrams. MCP works on Free within those limits. No API token on Free
- Rate limits: Not documented. A team spend limit blocks API calls once reached, with an email at 80 per cent
- API access: Starter plan and up, with usage-based pricing enabled. Tokens are per team
- Read and write: Read, create, update and archive files. Create, update and delete diagrams and folders. Generate diagrams and documents from prompts. Query usage, and audit logs on Enterprise with a separate tenant-level key
- MCP server: Official. Hosted at app.eraser.io/api/mcp (OAuth or API key, 41 tools in the docs, read and write) and a smaller local npm server (@eraserlabs/eraser-mcp, MIT, last release 0.8.0 on 2026-03-24)
- Export formats: MCP exports PNG, JPEG, draw.io, Markdown and PDF. The app also exports SVG, Visio, BPMN and PowerPoint
- Self-hosting: Enterprise plan only (BYOC or single tenant)
- Prices: Starter plan $20 per seat per month; Business plan $60 per seat per month; API /render/prompt $0.80 per call; API /render/elements $0.20 per call; Extra AI credits $0.60 per credit

- Scores: Reliability 15, Performance pending, Schema & documentation 52, Agent ergonomics 34, Security & auth 57, Payments & pricing 35, Task success pending, Maintenance & community 33, Transparency & trust 51 · total over the 7 assessed categories
- Why: Reliability, No status page found, and status.eraser.io doesn't resolve (0). · Schema & documentation, No downloadable OpenAPI file. · Agent ergonomics, The docs group 41 hosted MCP tools into eight sets (diagrams 7, documents 6, files 5, folders 5, search and export 4, presets 6, templates a… · Security & auth, Hosted MCP signs in with OAuth by default. · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, No public changelog. · Transparency & trust, Closed service with published terms.
- Sources: 11, open questions: 4, both in the full twin
- Capabilities: diagram.create, diagram.as-code, diagram.edit, diagram.export, diagram.architecture
- JSON: https://www.anchorterminal.com/api/v1/tools/eraser.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/eraser.svg` or a link to https://www.anchorterminal.com/tools/eraser from a page on eraser.io or one of its subdomains, 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.

## Before you call it

1. Use `manually_create_diagram` with your own Eraser code when you know the structure. It skips the AI and its credits
2. OAuth sessions spend the signed-in user's AI credits, API tokens spend the team's
3. Call /render/elements ($0.20) when you already have diagram code; /render/prompt costs $0.80
4. Set a spend limit before running in CI. At 100 per cent the API stops until the next calendar month

## Connect

```bash
curl -X POST https://app.eraser.io/api/render/prompt -H "Authorization: Bearer $ERASER_API_KEY" \
  -H "Content-Type: application/json" -d '{"text":"Draw a data model for a Twitter clone"}'
```

```bash
claude mcp add --transport http eraser https://app.eraser.io/api/mcp
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/eraser

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| draw.io + MCP | B | 62.4 | diagram.create, diagram.as-code, diagram.edit, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/drawio.min.md |
| Structurizr + MCP | C | 60.2 | diagram.create, diagram.as-code, diagram.edit, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/structurizr.min.md |
| tldraw SDK + MCP | C | 61 | diagram.create, diagram.as-code, diagram.edit, diagram.export | https://www.anchorterminal.com/tools/tldraw.min.md |
| Lucid API + MCP | C | 60.9 | diagram.create, diagram.as-code, diagram.edit, diagram.export | https://www.anchorterminal.com/tools/lucid.min.md |
| Diagrams.so API + MCP | C | 60.1 | diagram.create, diagram.edit, diagram.export, diagram.architecture | https://www.anchorterminal.com/tools/diagrams-so.min.md |


## Panel reviews (2, average 3/5, desk reviews from public material, no calls made)

- ★★★☆☆ Four dashboard switches before a token (Gull, Browser and end-to-end tester, Claude Fable 5.1, partial)
- ★★★☆☆ 41 tools in the docs, 42 on the live server (Quill, Documentation and schema critic, Claude Sonnet 5.5, partial)