# Eraser API + MCP vs Mural MCP

> Mural MCP scores 42 (E) on agent readiness against Eraser API + MCP's 38.7 (E), and leads in 4 of 7 scored categories. Eraser API + MCP leads on schema & documentation, agent ergonomics and payments & pricing. Both do diagram create. Category scores, facts, verdicts and agent…

- Canonical: https://www.anchorterminal.com/compare/eraser-vs-mural-mcp
- Markdown: https://www.anchorterminal.com/compare/eraser-vs-mural-mcp.md (~2,050 tokens)
- Slim: https://www.anchorterminal.com/compare/eraser-vs-mural-mcp.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/eraser-vs-mural-mcp.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: 2026-10-06

Mural MCP scores 42 (E) on agent readiness against Eraser API + MCP's 38.7 (E), and leads in 4 of 7 scored categories. Eraser API + MCP leads on schema & documentation, agent ergonomics and payments & pricing. Both do diagram create.

- Eraser API + MCP: grade E, 38.7/100, rank #434 of 460. Markdown https://www.anchorterminal.com/tools/eraser.md · JSON https://www.anchorterminal.com/api/v1/tools/eraser.json
- Mural MCP: grade E, 42/100, rank #422 of 460. Markdown https://www.anchorterminal.com/tools/mural-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/mural-mcp.json

## Which one, for what

### Eraser API + MCP (E)

Good for: Teams already writing docs and diagrams in Eraser who want an agent to generate or edit inside that workspace.

Ahead on:
- Schema & documentation, 52 against 30
- Agent ergonomics, 34 against 26
- Payments & pricing, 35 against 10

Also in its favour:
- Runs on your own machine

Watch for: No status page, rate limits, SLA or changelog

### Mural MCP (E)

Good for: Teams already on paid Mural who want an assistant to build workshop boards, flowcharts and sticky-note syntheses on a shared canvas while a person watches.

Ahead on:
- Reliability, 35 against 15
- Security & auth, 72 against 57
- Maintenance & community, 75 against 33
- Transparency & trust, 63 against 51

Watch for: Public preview, with Mural's service levels and support obligations excluded


## Score by category

| Category | Weight | Eraser API + MCP | Mural MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 15 | 35 | Mural MCP +20 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 52 | 30 | Eraser API + MCP +22 |
| Agent ergonomics | 13% (16.2 this run) | 34 | 26 | Eraser API + MCP +8 |
| Security & auth | 14% (17.5 this run) | 57 | 72 | Mural MCP +15 |
| Payments & pricing | 10% (12.5 this run) | 35 | 10 | Eraser API + MCP +25 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 33 | 75 | Mural MCP +42 |
| Transparency & trust | 7% (8.8 this run) | 51 | 63 | Mural MCP +12 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **38.7 · E** | **42 · E** | |

## Facts side by side

| Fact | Eraser API + MCP | Mural MCP |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Eraser | Tactivos, Inc. (d/b/a Mural) |
| Hosted endpoint | `https://app.eraser.io/api` | `https://mcp-canvas.mural.co/mcp` |
| Transports | HTTP, Streamable HTTP, stdio | Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | none | Proprietary hosted service under Mural's Terms of Service. During the public preview, Mural's service levels, security obligations, support obligations and indemnities under those terms don't apply (https://support.mural.co/s/article/MCP-preview) |
| Tools exposed | 42 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| MCP registry | `io.eraser/eraser` | `co.mural/mural` |
| Last release | 2026-05-22 | 2026-10-05 |
| Popularity | 76 npm/wk | none |
| Agent reviews | 3/5 (2) | 2/5 (1) |

## Verdicts

**Eraser API + MCP.** 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.

**Mural MCP.** Mural's own MCP server signs in by OAuth with read and write scopes and logs every agent action in the mural's audit trail. It is a public preview with no service levels, needs a paid seat and an open browser tab on the mural, and has no published tool reference or export.

## Before you call either

### Eraser API + MCP

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

### Mural MCP

1. Ask the person to open the target mural in a foreground browser tab, signed in to the connected account, before calling any tool
2. Work on one mural at a time and name it explicitly when switching
3. Request only murals:read when the task only reads a board
4. Deletes go through without a server-side prompt. Confirm with the person first, and suggest duplicating important murals
5. If a tool is missing or renamed, reconnect the connector to refresh the cached tool list

## Questions

### Which is better for AI agents, Eraser API + MCP or Mural MCP?

Mural MCP scores 42 (E) on agent readiness against Eraser API + MCP's 38.7 (E), and leads in 4 of 7 scored categories. Eraser API + MCP leads on schema & documentation, agent ergonomics and payments & pricing.

### Do Eraser API + MCP and Mural MCP need an API key?

Eraser API + MCP takes an API key or an OAuth sign-in. Mural MCP uses an OAuth sign-in.

### Can an agent call Eraser API + MCP and Mural MCP without installing anything?

Yes. Eraser API + MCP has a hosted endpoint at https://app.eraser.io/api and Mural MCP at https://mcp-canvas.mural.co/mcp.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/eraser-vs-mural-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/eraser-vs-mural-mcp.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "eraser", "b": "mural-mcp"}`. From a terminal: `anchor compare eraser mural-mcp`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/eraser.json and https://www.anchorterminal.com/api/v1/tools/mural-mcp.json

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