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Mendral / Hacker News

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2026-05-03

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  1. 2026-05-03 / HACKER NEWSThe Agent Harness Belongs Outside the Sandbox — Mendral's Architecture for Secure Credential Isolation — 126 PointsA Mendral engineering post (126 points, 91 comments on HN) argues that the agent harness (the loop that drives LLM tool calls) should run outside the sandbox, not inside. Key benefit: credentials stay out of the sandbox — the harness holds API keys, user tokens, and database access, while the sandbox contains only the agent's working environment. The post details three problems they solved to make the outside-harness model work. The HN thread became a practitioner discussion on agent security architecture, with multiple teams sharing their own harness isolation strategies.
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