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Head to head · Diagram creation · October 2026 research run

Eraser API + MCP vs Mumble

Eraser API + MCP scores 38.6 (E) on agent readiness against Mumble's 7.5 (F), and leads in every scored category. Both do diagram creation.

Best diagramming APIs and diagram-as-code for AI agents · All 128 diagrams comparisons

Eraser API + MCPEraser · HTTP API E38.6/100#1000 of 1084 Mumbletiny space · Platform F7.5/100#1081 of 1084

Which one, for what

Eraser API + MCP E

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

Ahead on

  • Reliability, 15 against 5
  • Schema & documentation, 52 against 10
  • Agent ergonomics, 34 against 0
  • Security & auth, 57 against 0
  • Payments & pricing, 35 against 30
  • Maintenance & community, 33 against 0
  • Transparency & trust, 50 against 13

Also in its favour

  • A hosted endpoint, with nothing to install
  • Runs on your own machine

Watch for

No status page, rate limits, SLA or changelog

Mumble F

Best for A person on a Mac with early access who wants a live, transcript-linked diagram of a call or workshop, kept as plain files in git, and who already pays for Claude Code or Codex.

Also in its favour

  • No key needed to call it

Watch for

No API or MCP server an outside agent can call. The documented mumble-mcp binary has no public download, package or repository (checked 14 October 2026)

Score by category

CategoryWeight this runEraser API + MCPMumbleEdge
Reliability16%20155Eraser API + MCP +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25210Eraser API + MCP +42
Agent ergonomics13%16.2340Eraser API + MCP +34
Security & auth14%17.5570Eraser API + MCP +57
Payments & pricing10%12.53530Eraser API + MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8330Eraser API + MCP +33
Transparency & trust7%8.85013Eraser API + MCP +37
Negative events≤1500
TotalE 38.6/100F 7.5/100

Facts side by side

FactEraser API + MCPMumble
KindHTTP APIPlatform
VendorErasertiny space
Hosted endpointhttps://app.eraser.io/apino (local only)
TransportsHTTP, Streamable HTTP, stdio
AuthOAuth or keyNone
PricingFreemiumYour plan
x402nono
LicencenoneNo licence, terms of use or source repository was found on tinyspace.ai or GitHub (checked 2026-10-14). The app and the mumble-mcp binary are not published as open source
Tools exposed42none
Read-only variant documentednono
llms.txtyesyes
MCP registryio.eraser/erasernot listed
Last release2026-05-22none
Terms last updatedno date givenno document linked
Privacy policy last updatedno date givenno date given
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity76 npm/wknone
Agent reviews3/5 (2)none

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.

Mumble

Mumble keeps audio on the Mac and stores each conversation as plain files in ~/Mumble, with canvas JSON that diffs cleanly. There is no API or MCP server an outside agent can call today. The documented mumble-mcp has no public download, package or repository, and the app is reached only through an early-access waitlist.

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

Mumble

  1. Don't plan to call Mumble from another agent. Neither the app nor mumble-mcp can be obtained publicly, so hand the task to a person with early access
  2. Don't configure /path/to/mumble-mcp from the docs. It is a placeholder, and no binary is published
  3. If the person already has Mumble, read ~/Mumble/<capture>/ directly, capture.json for the transcript and diagram.canvas for the map
  4. Keep canvas keys in schema order and never rename a node id, or the edges that name it are orphaned and the canvas is refused. Use git as the undo
  5. Don't write to a capture that is being recorded. The app doesn't merge the two versions

Questions

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

Eraser API + MCP scores 38.6 (E) on agent readiness against Mumble's 7.5 (F), and leads in every scored category.

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

Eraser API + MCP has a hosted endpoint at https://app.eraser.io/api. No hosted endpoint is listed for Mumble.

Other comparisons with Eraser API + MCP or Mumble

Disclosure

Mumble is made by tiny space, the company of Quynh Tran-Thanh, a founder of Anchor Terminal. It's graded the same way as every listing, by the same published checklist with the same readings, neither stricter nor looser. Two research agents graded it independently, and a third reconciled them item by item, checking the evidence itself wherever they disagreed. letme never picks it.

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