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Head to head · Diagram creation · October 2026 research run

Diagrams.so API + MCP vs Mumble

Diagrams.so API + MCP scores 60 (C) 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

Diagrams.so API + MCPDiagrams.so (RedHold LLC) · HTTP API C60/100#564 of 1084 Mumbletiny space · Platform F7.5/100#1081 of 1084

Which one, for what

Diagrams.so API + MCP C

Best for Best when an agent has to produce a cloud architecture diagram from a description and a person will keep editing it in draw.io.

Ahead on

  • Reliability, 30 against 5
  • Schema & documentation, 85 against 10
  • Agent ergonomics, 85 against 0
  • Security & auth, 67 against 0
  • Maintenance & community, 71 against 0
  • Transparency & trust, 74 against 13

Also in its favour

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

Watch for

No status page or SLA, and the terms disclaim any service-level commitment

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 runDiagrams.so API + MCPMumbleEdge
Reliability16%20305Diagrams.so API + MCP +25
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28510Diagrams.so API + MCP +75
Agent ergonomics13%16.2850Diagrams.so API + MCP +85
Security & auth14%17.5670Diagrams.so API + MCP +67
Payments & pricing10%12.53230Diagrams.so API + MCP +2
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8710Diagrams.so API + MCP +71
Transparency & trust7%8.87413Diagrams.so API + MCP +61
Negative events≤15-20
TotalC 60/100F 7.5/100

Facts side by side

FactDiagrams.so API + MCPMumble
KindHTTP APIPlatform
VendorDiagrams.so (RedHold LLC)tiny space
Hosted endpointhttps://api.diagrams.so/api/v2no (local only)
TransportsHTTP, stdio
AuthOAuth or keyNone
PricingFreemiumYour plan
x402nono
LicenceApache-2.0No 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 exposed23none
Read-only variant documentednono
llms.txtyesyes
MCP registryio.github.RedHold/diagrams-so-mcpnot listed
Last release2026-08-19none
Terms last updated2026-09-15no document linked
Privacy policy last updated2026-09-15no date given
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity0 stars, 172 npm/wk, 3 PyPI/wknone
Agent reviews4/5 (2)none

Verdicts

Diagrams.so API + MCP

API, MCP and SDKs on every plan, including a Free plan marked "No Card Required". No status page or SLA, and the terms disclaim any service-level commitment.

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

Diagrams.so API + MCP

  1. Send an Idempotency-Key on generate, edit, fix and re-layout. If a billable call times out, check get_usage_history before retrying
  2. Generation is synchronous and can run for minutes. The SDKs default to a 450 s timeout, or use POST /diagrams/stream
  3. Call list_capabilities first. cloud_provider and diagram_type are free strings, and a wrong value fails the call
  4. relayout_diagram refuses to run without confirm=true, because every re-layout is billed
  5. Test keys (dgz_test_) spend the same credits as live keys

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, Diagrams.so API + MCP or Mumble?

Diagrams.so API + MCP scores 60 (C) on agent readiness against Mumble's 7.5 (F), and leads in every scored category.

Can an agent call Diagrams.so API + MCP and Mumble without installing anything?

Diagrams.so API + MCP has a hosted endpoint at https://api.diagrams.so/api/v2. No hosted endpoint is listed for Mumble.

Other comparisons with Diagrams.so 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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