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Agent Infrastructure: Harnesses, Sandboxes, and Runtime Validation

Cursor’s $60 billion bet: the harness, not the model reports Cursor doubling down on a model‑agnostic agent harness and SDK that treat cloud VMs as the unit of developer productivity. Outcome engineers should study this pattern: a robust harness becomes the control plane for multi‑agent delivery and reproducible deployments — Principle 09 (Orchestration) and Principle 06 (Map).

Introducing Dynamic Workflows: durable execution that follows the tenant launches tenant‑isolated durable workflow routing that runs tenant‑specific runtime code for long‑lived agent processes. This matters for outcome engineers building multi‑tenant agent platforms: per‑tenant sandboxing and durable state routing reduce blast radius and make landscapes legible — Principle 07 (Tech Island) and Principle 06 (Map).

Reinforced Agent: Inference-Time Feedback for Tool-Calling Agents embeds a reviewer into the inference loop to detect and correct tool‑calling errors in real time. Runtime reviewers give you an automated immune system and a validation layer that catches miscalls before they affect outcomes — Principle 14 (Immune System) and Principle 16 (Validation).

Salesforce launches Agentforce Operations to fix the workflows breaking enterprise AI introduces a deterministic workflow control plane so agents run predictable, observable tasks instead of breaking fragile back‑office processes. Outcome engineers need these deterministic control planes to enforce safety, auditability, and integration contracts at scale — Principle 09 (Orchestration) and Principle 15 (Gate).

AI agents are running wild on developer machines. Incredibuild has a fix. describes Islo, a persistent cloud sandbox that isolates coding agents, scopes credentials, and enforces governance for continuous agent operation. Use persistent, remote sandboxes to keep local dev environments reproducible and secure while enabling agentic development — Principle 07 (Tech Island) and Principle 10 (Law).