# Gumloop vs Windmill API + MCP

> Gumloop scores 61.6 (C) to Windmill's 55.9 (C) for workflow automation. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/gumloop-vs-windmill
- Markdown: https://www.anchorterminal.com/compare/gumloop-vs-windmill.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/gumloop-vs-windmill.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/gumloop-vs-windmill.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: 2026-10-08

Gumloop scores 61.6 (C) on agent readiness against Windmill API + MCP's 55.9 (C), and leads in 2 of 7 scored categories. Windmill API + MCP leads on agent ergonomics, security & auth, payments & pricing, maintenance & community and transparency & trust. Both do workflow automation.

- Gumloop: grade C, 61.6/100, rank #463 of 950. Markdown https://www.anchorterminal.com/tools/gumloop.md · JSON https://www.anchorterminal.com/api/v1/tools/gumloop.json
- Windmill API + MCP: grade C, 55.9/100, rank #644 of 950. Markdown https://www.anchorterminal.com/tools/windmill.md · JSON https://www.anchorterminal.com/api/v1/tools/windmill.json
- Best workflow automation platforms with APIs for AI agents: https://www.anchorterminal.com/best/workflow-automation/index.md
- All 108 workflows comparisons: https://www.anchorterminal.com/compare/workflow-automation/index.md

## Which one, for what

### Gumloop (C)

Good for: A team that wants hosted agents with connectors, approvals and triggers, driven or configured by an outside agent through the API or MCP server.

Ahead on:
- Reliability, 82 against 40

Watch for: API keys and the `gumloop_api` OAuth scope need the Pro plan at $37 a month. The 14-day trial needs a card

### Windmill API + MCP (C)

Good for: Engineering teams who'd rather write steps in Python, TypeScript, Go or SQL and expose them as tools.

Ahead on:
- Agent ergonomics, 73 against 66
- Security & auth, 60 against 50
- Payments & pricing, 35 against 20
- Maintenance & community, 87 against 77
- Transparency & trust, 65 against 57

Also in its favour:
- Open source

Watch for: The default MCP URL puts the token in `?token=` unless a superadmin turns that off


## Score by category

| Category | Weight | Gumloop | Windmill API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 82 | 40 | Gumloop +42 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 79 | Gumloop +4 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 73 | Windmill API + MCP +7 |
| Security & auth | 14% (17.5 this run) | 50 | 60 | Windmill API + MCP +10 |
| Payments & pricing | 10% (12.5 this run) | 20 | 35 | Windmill API + MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 77 | 87 | Windmill API + MCP +10 |
| Transparency & trust | 7% (8.8 this run) | 57 | 65 | Windmill API + MCP +8 |
| Negative events | ≤15 | -2 | -5 | |
| **Total** | | **61.6 · C** | **55.9 · C** | |

## Facts side by side

| Fact | Gumloop | Windmill API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | AgentHub Inc. | Windmill Labs |
| Hosted endpoint | `https://api.gumloop.com/api/v1` | `https://app.windmill.dev/api` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Gumloop's terms of service. The Python SDK and CLI repository and the npm package are Apache-2.0 | AGPL-3.0 (core), Apache-2.0 (clients and OpenAPI), commercial for enterprise-only parts |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-08 | 2026-10-01 |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | no date given | no date given |
| Customer content may train models | yes | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | yes | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 188 npm/wk, 2.9k PyPI/wk | 18k stars, 126k npm/wk, 218k PyPI/wk |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**Gumloop.** Gumloop's REST API has a public OpenAPI file with 105 operations, Markdown docs and a changelog with 28 dated releases since 9 July 2026. API keys need the $37 Pro plan, the trial needs a card, the key can travel in the URL, and self-serve content may be used to train Gumloop's models.

**Windmill API + MCP.** Token scopes down to a single script path, with expiry. The default MCP URL puts the token in `?token=` unless a superadmin turns that off.

## Before you call either

### Gumloop

1. Send the key as `Authorization: Bearer` and, for a personal key, add the `x-auth-key` header with the user ID. Do not put `api_key` in the URL
2. Create sessions with `POST /agents/{agent_id}/sessions`, then poll `GET /sessions/{session_id}`. A 202 means processing or queued, and the reply is not in the response
3. Supply your own `session_id` when creating a session. A repeat returns 409, which makes a retry safe
4. For streamed output send the same body with `stream: true` to `ws.gumloop.com`. `api.gumloop.com` answers 400 to it
5. Treat a webhook trigger URL as a password. It returns `{"success": true}` at once and never carries the agent's output

### Windmill API + MCP

1. Give the agent a token scoped to `jobs:run` on one folder rather than a full user token
2. Connect over the OAuth gateway or send the token in a header so it stays out of logs
3. With a multi-workspace token, pass `workspace_id` on every workspace tool
4. Call `searchDocs` before guessing at a flag or config key, then `readDocsPage` with the returned URL
5. Poll the job by ID after `runScriptByPath` for long jobs instead of waiting on the call

## Questions

### Which is better for AI agents, Gumloop or Windmill API + MCP?

Gumloop scores 61.6 (C) on agent readiness against Windmill API + MCP's 55.9 (C), and leads in 2 of 7 scored categories. Windmill API + MCP leads on agent ergonomics, security & auth, payments & pricing, maintenance & community and transparency & trust.

### Do Gumloop and Windmill API + MCP need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Gumloop and Windmill API + MCP without installing anything?

Yes. Gumloop has a hosted endpoint at https://api.gumloop.com/api/v1 and Windmill API + MCP at https://app.windmill.dev/api.

### Are Gumloop and Windmill API + MCP open source?

No open-source release is listed for Gumloop. Windmill API + MCP is open source (AGPL-3.0 (core), Apache-2.0 (clients and OpenAPI), commercial for enterprise-only parts).


## For agents

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

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