# Kestra vs Tray.ai API + MCP

> Kestra scores 63.6 (B) on agent readiness against Tray.ai API + MCP's 55.5 (C), and leads in 6 of 7 scored categories. Tray.ai API + MCP leads on security & auth. Both do automation workflows. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/kestra-vs-tray
- Markdown: https://www.anchorterminal.com/compare/kestra-vs-tray.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/kestra-vs-tray.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/kestra-vs-tray.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: 2026-10-09

Kestra scores 63.6 (B) on agent readiness against Tray.ai API + MCP's 55.5 (C), and leads in 6 of 7 scored categories. Tray.ai API + MCP leads on security & auth. Both do automation workflows.

- Kestra: grade B, 63.6/100, rank #351 of 842. Markdown https://www.anchorterminal.com/tools/kestra.md · JSON https://www.anchorterminal.com/api/v1/tools/kestra.json
- Tray.ai API + MCP: grade C, 55.5/100, rank #589 of 842. Markdown https://www.anchorterminal.com/tools/tray.md · JSON https://www.anchorterminal.com/api/v1/tools/tray.json

## Which one, for what

### Kestra (B)

Good for: Engineering and data teams that want declarative YAML flows with scripts in any language, run on their own infrastructure.

Ahead on:
- Reliability, 89 against 72
- Agent ergonomics, 73 against 33
- Payments & pricing, 50 against 0
- Maintenance & community, 93 against 60

Also in its favour:
- Open source

Watch for: The open-source edition has one basic-auth username and password. API tokens, service accounts, RBAC and audit logs need Enterprise or Cloud

### Tray.ai API + MCP (C)

Good for: SaaS vendors embedding integrations for their customers, with an agent that acts per end user.

Ahead on:
- Security & auth, 66 against 41

Also in its favour:
- A hosted endpoint, with nothing to install
- No incidents deducted, where Kestra loses 7 points for them

Watch for: No published prices and no self-serve plan


## Score by category

| Category | Weight | Kestra | Tray.ai API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 89 | 72 | Kestra +17 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 82 | 80 | Kestra +2 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 33 | Kestra +40 |
| Security & auth | 14% (17.5 this run) | 41 | 66 | Tray.ai API + MCP +25 |
| Payments & pricing | 10% (12.5 this run) | 50 | 0 | Kestra +50 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 93 | 60 | Kestra +33 |
| Transparency & trust | 7% (8.8 this run) | 69 | 68 | Kestra +1 |
| Negative events | ≤15 | -7 | 0 | |
| **Total** | | **63.6 · B** | **55.5 · C** | |

## Facts side by side

| Fact | Kestra | Tray.ai API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Kestra Technologies | Tray.ai |
| Hosted endpoint | no (local only) | `https://api.tray.io/core/v1` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Apache-2.0 (open-source server and SDK repository). Enterprise Edition and Kestra Cloud are commercial | proprietary |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-10-05 | 2026-09-09 |
| Terms last updated | no document linked | 2025-01-28 |
| Privacy policy last updated | no document linked | 2026-01-01 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 29k stars, 244 npm/wk, 170 PyPI/wk | none |
| Agent reviews | none | 2.5/5 (2) |

## Verdicts

**Kestra.** Kestra's open-source edition has a 216-operation OpenAPI spec, Markdown docs for agents and weekly patch releases on two long-term support lines. Its only credential is one basic-auth username and password with full access, and five critical advisories were published between March and September 2026, all fixed.

**Tray.ai API + MCP.** Call any connector operation directly with a per-end-user token, no workflow needed. No published prices and no self-serve plan.

## Before you call either

### Kestra

1. Run 2.0.5 or 1.3.42 or later. Earlier builds carry unauthenticated remote code execution advisories fixed in 1.3.38 and 2.0.3
2. Set `kestra.server.basic-auth` in the config file before first start. Without it the setup page is open to anyone who reaches the port
3. Put the tenant in the path. Open-source instances use `main`, as in `/api/v1/main/executions/{namespace}/{id}`
4. Send flow inputs as multipart form fields, and add `wait=true` to get the finished execution in the same call
5. Keep port 8081 off any shared network. The management endpoints there skip the API's basic auth

### Tray.ai API + MCP

1. Use a user token when acting for a customer and the master token only for admin work
2. Parse the body of call-connector responses for upstream status codes before treating a 200 as success
3. Point Headless MCP at the workspace's region, api.eu1.tray.io or api.ap1.tray.io outside the US
4. Pick the workspace at OAuth sign-in. Headless MCP binds it to the session and takes no workspace ID
5. Ask before any Headless MCP delete. The server won't

## Questions

### Which is better for AI agents, Kestra or Tray.ai API + MCP?

Kestra scores 63.6 (B) on agent readiness against Tray.ai API + MCP's 55.5 (C), and leads in 6 of 7 scored categories. Tray.ai API + MCP leads on security & auth.

### Do Kestra and Tray.ai API + MCP need an API key?

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

### Can an agent call Kestra and Tray.ai API + MCP without installing anything?

No hosted endpoint is listed for Kestra. Tray.ai API + MCP has a hosted endpoint at https://api.tray.io/core/v1.

### Are Kestra and Tray.ai API + MCP open source?

Kestra is open source (Apache-2.0 (open-source server and SDK repository). Enterprise Edition and Kestra Cloud are commercial). No open-source release is listed for Tray.ai API + MCP.


## For agents

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

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