41 lines
1.6 KiB
Markdown
41 lines
1.6 KiB
Markdown
---
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title: "7-Layer Harness Stack"
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type: concept
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tags:
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- "harness-engineering"
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- "agentic-ai"
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- "system-design"
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sources:
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- "Your-AI-Isn-t-Stupid---It-Just-Needs-a-Better-Harness--Lychee-Technology-Engineering-Blog"
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last_updated: 2026-04-20
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---
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## Overview
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7层 Harness Stack——production-grade AI Agent 系统的分层架构规范，从认知层到约束恢复层的完整 7 层结构。
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## Structure
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| Layer | Name | Core Function |
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|-------|------|--------------|
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| 1 | Cognition | 受限操作边界，role file/job description |
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| 2 | Tools | 工具输出排序/去重/token 预算截断 |
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| 3 | Contracts & Interfaces | JSON Schema 边界验证，防 Schema Drift |
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| 4 | Orchestration | DAG/状态机约束允许的动作 |
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| 5 | Memory & State | Working Memory + Persistent State 分层 |
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| 6 | Evaluation & Observation | 异构验证（规则/工具/LLM-as-judge）|
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| 7 | Constraints & Recovery | 幂等重试，Context Reset 机制 |
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## Principles
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- 模型在 Harness 内部，不直接对用户或外部世界说话
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- 每个边界交叉处有显式契约：严格 JSON Schema / 类型化函数签名 / 版本化 API spec
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- 每一层产生可被模型以外的东西验证的输出
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## Related Concepts
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- [[Harness-Engineering]] — 父概念，本框架所属的工程学科
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- [[Context-Reset]] — 第 7 层 Constraints & Recovery 的关键机制
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- [[Sprint-Contract]] — 第 6 层 Evaluation 的关键机制
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- [[Schema-Drift]] — 第 3 层 Contracts 要解决的核心问题
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## Source
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- [[Your-AI-Isn-t-Stupid---It-Just-Needs-a-Better-Harness--Lychee-Technology-Engineering-Blog]]
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