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https://github.com/deepseek-ai/deepseek-harness
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New doc-sync gate verify-website-yaml: each ```yaml block under website/zh-CN (api/ excluded — generator-owned) must parse with the loader's real schema (JSON_SCHEMA + !!js), use only EntryOptions keys, name only real workspace packages, and pass only config keys the plugin's declared Config type / schemastery schema accepts (collectConfigCatalog drives the key sets). ```yaml ignore-check opts out a deliberate-placeholder block (the capability-trio tutorial keeps its fictional package names).
157 lines
4.7 KiB
Markdown
157 lines
4.7 KiB
Markdown
# 能力的三层拆分
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当一个能力(插件)足够通用(比如"执行 bash 命令"),Harness 会把它拆成三个包:**接口**、**实现**、**消费者**。这样可以独立替换其中任何一层。
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## 以 Bash 为例
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考虑 "Bash 执行" 这个能力:
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- **接口** (`dsh-bash`) — 定义"bash 执行"长什么样:输入是什么、输出是什么
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- **实现** (`dsh-bash-local`) — 真正在本地跑命令的代码
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- **消费者** (`dsh-tool-bash`) — 把这个能力包装成模型能调用的 tool
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```
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┌─────────────┐ ┌──────────────────┐ ┌──────────────┐
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│ dsh-bash │────▶│ dsh-bash-local │ │ dsh-tool-bash│
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│ (接口) │ │ (实现) │ │ (消费者/tool)│
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└─────────────┘ └──────────────────┘ └──────────────┘
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▲ │
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└────────────────────────────────────────────┘
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inject: ['bash']
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```
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## 拆分的好处
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### 具体实现可替换
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同一个接口可以有多种实现。用户通过 `cordis.yml` 选择:
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```yaml
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# 本地执行
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- name: '@deepseek-ai/dsh-bash-local'
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# 或:远程沙箱执行(未来)
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# - name: '@deepseek-ai/dsh-bash-remote'
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# config:
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# endpoint: 'https://sandbox.example.com'
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```
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接口不变、tool 不变,只换实现。
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### 独立演进
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- 接口定义稳定后很少改动
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- 实现可以独立优化(性能、安全)
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- 消费者(tool)可以调整对模型的呈现方式
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### 依赖解耦
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- 实现 depend on 接口
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- 消费者 depend on 接口
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- 实现和消费者**互不依赖**
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## Harness 中内置的三件套
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| 能力 | 接口 (seam) | 实现 | 消费者 (tool) |
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|------|-------------|------|---------------|
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| Bash | `dsh-bash` | `dsh-bash-local` | `dsh-tool-bash` |
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| 文件系统 | `dsh-fs` | `dsh-fs-local` + `dsh-fs-policy` | `dsh-tool-fs` |
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| Web | `dsh-web` | `dsh-web-fetch-local` / `dsh-web-search-*` | `dsh-tool-web` |
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| 子代理 | `dsh-subagent` | `dsh-subagent-spawn` / `dsh-subagent-fork` | `dsh-tool-subagent` |
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| 压缩 | `dsh-compact` | `dsh-compact-basic` | (内置于 agent-loop) |
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## 开发你自己的三件套
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### 第一步:定义接口
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```ts
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// packages/my-cap/my-cap/src/index.ts
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import { Service, type Context } from 'cordis'
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declare module 'cordis' {
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interface Context {
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myCap: MyCapService
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}
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}
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export abstract class MyCapService extends Service {
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constructor(ctx: Context) {
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super(ctx, 'myCap')
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}
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/** 执行能力的核心方法 */
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abstract execute(request: MyCapRequest): Promise<MyCapResult>
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}
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export interface MyCapRequest {
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input: string
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}
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export interface MyCapResult {
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output: string
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}
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```
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### 第二步:编写实现
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```ts ignore-check
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// packages/my-cap/my-cap-local/src/index.ts
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import type { Context } from 'cordis'
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import { MyCapService, type MyCapRequest, type MyCapResult } from '@deepseek-ai/dsh-my-cap'
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class MyCapLocal extends MyCapService {
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async execute(request: MyCapRequest): Promise<MyCapResult> {
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// 具体实现
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return { output: request.input.toUpperCase() }
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}
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}
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export const name = 'my-cap-local'
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export function apply(ctx: Context) {
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ctx.plugin(MyCapLocal)
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}
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```
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### 第三步:编写消费者 (tool)
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```ts
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// packages/my-cap/tool-my-cap/src/index.ts
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import type { Context } from 'cordis'
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import { defineTool } from '@deepseek-ai/dsh-tools'
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export const name = 'tool-my-cap'
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export const inject = ['tools', 'myCap']
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export function apply(ctx: Context) {
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ctx.tools.register(defineTool({
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name: 'my_cap',
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description: 'Execute my capability.',
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parameters: {
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input: { type: 'string', required: true },
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},
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async execute(args) {
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const result = await ctx.myCap.execute({ input: args.input })
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return [{ type: 'text', text: result.output }]
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},
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}))
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}
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```
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### 在 cordis.yml 中组合
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```yaml ignore-check
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- name: '@deepseek-ai/dsh-my-cap-local'
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- name: '@deepseek-ai/dsh-tool-my-cap'
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```
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## 设计要点
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- **不要预防性拆分** — 只有当你确实需要可替换实现时才拆三件套。一个简单的 tool 插件不需要拆分。
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- **接口定义 Request/Result 类型** — 实现和消费者只依赖接口包。
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- **Explicit > Implicit** — 实现中的默认值处理应该是显式的 `resolve(request): Spec` 步骤,不是隐藏在 `run()` 中的 `?? default`。
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## 下一步
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- [LLM 适配器](./llm-adapter) — 实现一个 LLM 后端(最常见的 seam 扩展)
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