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Issue 37/October 10, 2026/5 tools · 1 headlines

MicroVM forks and local harness control planes overtake cloud IDEs

Power users are wiring disposable kernels, credential brokers, and pluggable loops into their own agent cycles. Today’s picks emphasize clone-and-run sandboxes plus self-hosted runtimes that keep secrets and state off the model path.

01 — Power tools

The stack

  1. 01harnessGitHub
    mi↗

    av

    Minimal self-extending sandboxed agentic harness consisting of a loop, two tools and an LLM that hot-loads new tools from .mjs files.

    Use caseUse it to bootstrap a coding agent that can extend its own toolset while running inside an optional Docker sandbox.

    harnessminimalsandboxself-extending
  2. 02repoGitHub
    Sandcastle↗

    various

    TypeScript library for orchestrating coding agents inside isolated sandboxes with configurable branch strategies.

    Use caseUse it to spin parallel agent worktrees that stay isolated until a merge decision is made.

    sandboxtypescriptorchestration
  3. 03harnessGitHub
    Agnes Harness↗

    AgnesAI-Labs

    Pluggable agent harness designed for forward-deployed engineering with recoverable evidence-first execution.

    Use caseUse it to run trustable agent workflows that produce auditable artifacts and can resume after failures.

    harnessfdeevidence
  4. 04repoGitHub
    deepagents-sbx↗

    restuhaqza

    MicroVM backend for Deep Agents that runs every command inside a guest with its own Linux kernel and private Docker daemon.

    Use caseUse it to give LangGraph Deep Agents hardware isolation so generated containers never share the host kernel.

    microvmdeep-agentssandbox
  5. 05toolGitHub
    mvm↗

    agentstep

    Hardware-isolated Linux VMs that boot in 0.35 s on Apple Silicon and the same binary on Linux Firecracker hosts.

    Use caseUse it to provide coding agents native microVMs on macOS that pause to zero CPU and restore with disk rollback.

    microvmmacosfirecracker

02 — In the wild

Articles and releases

  1. articleRetool Blog
    Retool launches centralized enterprise agent harness↗

    David Hsu

    Retool opened early access to a shared policy and execution layer that sits between every employee agent and company systems. It virtualizes filesystems and memory per user while enforcing central tool and model controls.

    enterpriseharnessarticle

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