Field notes on agent systems

Agent Harness

Engineering reliable coding agents through structured context, executable tools, cumulative memory, external evaluation, and disciplined feedback loops.

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Premise

The system around the model determines the ceiling.

Series index

Field-tested notes

Case studies and design patterns for agents that must improve continuously without losing reliability, traceability, or control.

Harness 01
Case StudyValidationMemoryMulti-Agent

How a Coding Agent Reached the Global Top 10 on AgentTank in Under 24 Hours

How structured priors, shared failure memory, replay-driven iteration, and rigid validation gates took an AgenTank coding agent from unranked to a global peak of #7.

July 12, 2026 10 min readEnglish / 中文