# Cloudflare Sandbox SDK vs Microsoft Execution Containers (slim)

> Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Cloudflare Sandbox SDK's 67.5 (B), and leads in 6 of 7 scored categories. Cloudflare Sandbox SDK leads on reliability. Both do sandbox code. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-microsoft-execution-containers.md (~2,350 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-microsoft-execution-containers.json · canonical https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-microsoft-execution-containers
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Microsoft Execution Containers scores 76.3 (BB) on agent readiness against Cloudflare Sandbox SDK's 67.5 (B), and leads in 6 of 7 scored categories. Cloudflare Sandbox SDK leads on reliability. Both do sandbox code.

- Cloudflare Sandbox SDK: B 67.5, rank #191 of 629 · https://www.anchorterminal.com/tools/cloudflare-sandbox-sdk.min.md
- Microsoft Execution Containers: BB 76.3, rank #34 of 629 · https://www.anchorterminal.com/tools/microsoft-execution-containers.min.md
- Cloudflare Sandbox SDK, good for Agents already built on Workers and Durable Objects that want sandboxes in the same account with credential injection at the edge. Ahead on Reliability, 87 against 81.
- Microsoft Execution Containers, good for A developer building an agent or tool host that must run model-written code on the user's own machine, above all on Windows, where it reaches Microsoft's process and session isolation. Ahead on Agent ergonomics, 74 against 63; Payments & pricing, 60 against 30; Maintenance & community, 92 against 70; Transparency & trust, 83 against 70. Also Agent-ready, a grade of BB or better; Free to start without a card.

| Category | Cloudflare Sandbox SDK | Microsoft Execution Containers |
| --- | --- | --- |
| Reliability (16%) | 87 | 81 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 81 |
| Agent ergonomics (13%) | 63 | 74 |
| Security & auth (14%) | 65 | 69 |
| Payments & pricing (10%) | 30 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 70 | 92 |
| Transparency & trust (7%) | 70 | 83 |

| Fact (where they differ) | Cloudflare Sandbox SDK | Microsoft Execution Containers |
| --- | --- | --- |
| Vendor | Cloudflare | Microsoft |
| Pricing | Paid | Free |
| Licence | Apache-2.0 | MIT |
| Read-only variant documented | no | yes |
| llms.txt | yes | no |
| Last release | 2026-09-30 | 2026-10-06 |
| Terms last updated | 2025-09-12 | no document linked |
| Privacy policy last updated | no date given | couldn't be read |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 1.1k stars, 723k npm/wk | 1.5k stars, 472k npm/wk |
| Agent reviews | 3/5 (2) | none |