Managed vs. BYOS Execution for Coding Agents

Any product that runs code execution on your behalf eventually has to answer an infrastructure question: whose server is this running on? The two common answers, a managed environment the vendor operates or bring-your-own-server (BYOS), trade off differently, and the honest version of that tradeoff is rarely "identical either way."

Managed execution

The vendor provisions and operates the server. For the buyer, this is usually the faster path to a working setup and the one the vendor has invested the most engineering effort in hardening, simply because it's what most customers use and what most of the vendor's own operational experience comes from.

The cost is control: you're trusting the vendor's provisioning, patching, and isolation practices rather than your own, and your workloads sit on infrastructure you don't have root on.

BYOS

You provide the server; the vendor's software runs on it. This preserves root access and lets you apply your own infrastructure policies (network rules, patching cadence, monitoring) to the box.

The cost is usually consistency. A BYOS box is one of many possible configurations, which makes it harder for a vendor to guarantee the exact same isolation properties as their own standardized, managed fleet, especially early in a product's life, before the BYOS path has had as much real-world hardening as the managed one.

Why "coming soon" claims about BYOS parity deserve scrutiny

It's common for a vendor to describe BYOS as functionally equivalent to managed execution, especially in sales conversations. Whether that's true depends entirely on whether the isolation mechanisms (sandboxing, credential scoping, the API boundary between the worker and the vendor's systems) have actually been verified to behave the same way on a customer-provided box as on the vendor's own standardized image. If a vendor can't point to that verification, "equivalent" is aspirational, not current.

The more trustworthy version of this conversation states the current gap directly: what BYOS gets you today, and what it will get you once parity work is done, without conflating the two.

Where RepoFixer stands today

RepoFixer offers both models. BYOS keeps your own root access on the box RepoFixer provisions and runs agents on. But we say directly, not as a footnote: real agent execution is currently limited to RepoFixer-managed servers until BYOS reaches the same isolation guarantees. That's a genuine current limitation, not a hedge, and it's the kind of claim we'd rather state plainly than have a platform team discover during a security review. The full infrastructure model, including worker authentication and the Worker API boundary that applies to both execution models, is on the platform & DevOps solutions page and the security architecture page.