Harvey

I build software and independent products, increasingly with AI. Interested in architecture, tools, and the craft of making software.

[Harvey @harvey_ddd]

@upon258 猫

[Harvey @harvey_ddd]

@skybytee @grok 他在说什么？

[Harvey @harvey_ddd]

@czy194 温哥华呀，靠海，冬天能滑雪，开车就去西雅图，Richmond吃中餐，半夜一样送外卖，喜欢淘宝可以海运，有钱就空运，唯独便利性稍差

[Harvey @harvey_ddd]

@king1818888 Agent Harness + Model能力已经过了需要逐步review的阶段了，现在重点是怎么做好新的Agentic Engineering，整个开发流程，范式，甚至代码架构思想都已经发生了改变，不能再把Agent当代码生成工具了。

[Harvey @harvey_ddd]

7/7 My take: Jev matters less as new general intelligence than as a missing control-plane primitive. A generative model proposes; Jev makes bounded semantic branches; deterministic code enforces the non-negotiables.

[Harvey @harvey_ddd]

1/7 Why is everyone talking about Jev? It became one of the week's biggest AI launches despite being unable to write a sentence. That limitation is exactly the point. 🧵

[Harvey @harvey_ddd]

6/7 Jev cannot emit an invalid schema, but it can return a wrong valid answer. Adversarial state can move risk judgments. Use it as one guardrail layer, never as the security boundary.

[Harvey @harvey_ddd]

6/6 我暂时的原则：确定性代码守住不可妥协的约束，Agent 处理无法穷举的变化。任何动态代码和行动，都必须处在权限、测试、审查、预算与回滚边界内。你会怎么划这条边界？

[Harvey @harvey_ddd]

1/6 最近实现了一个 agent harness，越来越觉得：Agentic software 不是在传统 workflow 里塞一个 LLM，而是一种不同的软件形态。🧵

2/6 传统软件由人预先编码确定性流程。需求一变，就修改代码；开闭原则、依赖倒置等设计原则，本质上都在帮助我们控制变化成本。

[Harvey @harvey_ddd]

4/6 最终形成的是一个混合系统：确定性骨架 + 受约束的动态执行。权限、事务、验证和安全边界必须确定；无法穷举的变化，则交给 Agent 根据上下文规划和处理。

5/6 新的核心问题不再只是“如何让代码对扩展开放”，而是：什么必须确定？什么可以委托？Agent 的行动如何被测试、审查、观测和回滚？

[Harvey @harvey_ddd]

6/6 My current principle: deterministic code protects non-negotiable constraints; agents handle non-enumerable change. Generated code and actions must stay within explicit permission, testing, review, budget, and rollback boundaries. How do you draw this line?

[Harvey @harvey_ddd]

1/6 After building an agent harness, I realized that agentic software isn’t just a traditional workflow with an LLM inserted into one step. It may be a fundamentally different software architecture. 🧵

[Harvey @harvey_ddd]

5/6 The central question is no longer only “How do we make code open for extension?” It is also: What must remain deterministic? What may be delegated? How are agent actions tested, reviewed, observed, and rolled back?