Before coding an agent harness: charter, blueprint, threat model, then build

Telos_in_the_Void · reddit · 2026-09-10

A developer with a project/strategy background proposes planning agent harnesses before coding: start with a deep project charter (objectives, scope, constraints, failure conditions), map agents, tools, data flows, permissions, human checkpoints and trust boundaries visually, then implement. He outlines a pipeline — charter → blueprint → threat model → harness → adversarial testing → runtime enforcement — arguing that prompt injection and privilege-escalation vulnerabilities often originate in skipped design phases, while noting documentation itself is not a security boundary. He asks what planning artifacts and diagramming tools mature agent teams actually use.

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