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AI agent sandboxes

An agent that runs code, installs packages, or drives a browser needs somewhere to do it that is not your laptop or your production cluster. These posts cover how agent sandboxes work, what coding and browser agents actually need from one, how to scope tool permissions, and how to run many agents in parallel with a hardware-isolated microVM per session.

AI agent sandboxes on PandaStack

217 posts

·11 min read

Top 13 Ephemeral Development Environment Platforms in 2026: Who Is Allowed to Call Create

This category was designed for a person opening a laptop. In 2026 the fastest-growing caller is a webhook, a CI matrix or an agent. Thirteen platforms graded on whether create is a real API, what the isolation boundary is when a model wrote the code, what happens at fifty concurrent, and whether there is a cold path at all or only a warm path you can miss.

ephemeral-environmentsdev-environmentssandbox-api
Ajay Kumar
·10 min read

The Best Sandbox APIs for PHP and Laravel AI Agents in 2026

PHP cannot sandbox PHP — eval is not a boundary and disable_functions is a denylist over a vast standard library. Here is the honest field of options for running model-written PHP, and the PHP-shaped questions that decide which one fits.

comparisonphplaravel
Ajay Kumar
·11 min read

Giving an AI Agent a Language Server: The Index Is Code Execution

An agent that edits code by grepping and guessing is the agent everyone complains about. A language server fixes that — and quietly runs the repository's build scripts to do it. So run the indexer in a microVM, snapshot the warm index, and restore it per session.

ai-agentslanguage-serverlsp
Ajay Kumar
·10 min read

AgentCore's Code Interpreter, or a Sandbox You Hold?

The question is not which sandbox boots faster. It is how much of your agent stack you want to buy as one unit — and AgentCore is a very large unit that happens to contain a code interpreter.

awsbedrock-agentcorecode-interpreter
Ajay Kumar
·11 min read

Top 11 Ephemeral Development Environment Platforms (2026)

Every roundup in this category sorts by substrate or by price list. Both are downstream of a question nobody asks on the evaluation call: who, or what, is going to call create? Eleven platforms sorted by their creator — human, CI job, pull-request webhook, agent API — because the creator decides how many environments exist at once and who pays for the idle ones.

comparisondev-environmentsephemeral
Ajay Kumar
·11 min read

PandaStack vs Gitpod / Ona: A Workspace Is Not a Sandbox

Gitpod was right about disposable development environments before most of the industry agreed. The divergence is not quality, it is the unit: a workspace a person opens, versus a sandbox an API call creates and throws away 400 times.

gitpodonacomparison
Ajay Kumar
·11 min read

Top 6 Ephemeral Dev Environment Platforms for AI Agents

Every roundup of ephemeral development environments grades them for a human opening an IDE. This one grades them for an autonomous agent with no hands, no browser and no patience — six platforms, one rubric, including where mine loses.

comparisonai-agentsephemeral
Ajay Kumar
·11 min read

A Real Red-Green Loop for Coding Agents, One MicroVM per Attempt

The single highest-signal tool you can hand a coding agent is a test runner it can actually run. Here is the two-layer architecture that makes the loop fast enough to use, the output format a model can read, and the limits the loop exists to discover you forgot.

ai-agentstddtesting
Ajay Kumar
·10 min read

A Linux Desktop per Agent: Xvfb, VNC, and One MicroVM per Session

A computer-use agent driving a mouse over arbitrary websites needs a whole desktop, and the blast radius of that is a whole machine. Here is the Xvfb + x11vnc + noVNC stack, why it belongs in its own microVM, and the parts that have no GPU to save them.

ai-agentscomputer-usevnc
Ajay Kumar

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