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The Harness is the Moat: Building a Deterministic Agent Runtime with Context Pruning

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

Every agent looks brilliant in a five-turn demo. You give it a neat prompt, wire up two mock tools, ask it to look up a customer ID and draft a confirmation email, and it flies through without missing a step. You feel like you have automated half your workday before lunch. Then you deploy it into a…

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  1. 2026-09-16 12:30 · DEV Community — AI
    The Harness is the Moat: Building a Deterministic Agent Runtime with Context Pruning

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