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Notes from the team building iii.

• Why agent sandboxes are converging on libkrun, not Firecracker

  May 15, 2026 · Local-first coding agents need hardware isolation on macOS and Linux, and libkrun is the practical microVM path.

• Building Agents for Real World

  May 14, 2026 · Reliable agent systems converge when validation, isolation, and observability are properties of the runtime, not reminders in a playbook.

• Add a worker

  May 7, 2026 · The cloud is a bazaar, and that was okay until agents arrived and had to contend with 10,000 shops. Three primitives, one engine, and one answer to every question.

• The Harness Is the Backend

  Apr 28, 2026 · The agent harness debate takes for granted that the harness is its own world, separate from the backend. iii makes a different bet: the harness is the backend.