# 系统提示词组装
[English](system-prompt.md) | 中文
[system-prompt 包](../../packages/core/system-prompt)负责管理提示词贡献者与一次组装调用之间交换的数据。该包的 [README](../../packages/core/system-prompt/README.md) 记录注册、排序、作用域与渲染行为；本页记录各插件实现或传递的确切跨包类型。
源码：[`packages/core/system-prompt/src/index.ts`](../../packages/core/system-prompt/src/index.ts)。
## 组装上下文
`AssembleContext` 标识一次组装所解析的作用域层，并可携带该请求的显式控制信号。它可合并扩展：`dsh-agent` 添加可选字段 `agent`，用于携带当前的 agent（智能体）实例；`assembleContextFor(agent, signal)` 则一起设置这些显式字段。裸组装既没有作用域，也没有信号。
```ts type-equiv
/** Merge-extensible context for one prompt assembly. */
interface AssembleContext {
/**
* Scope whose providers and waterfall listeners participate. When absent,
* only global providers and subject-less listeners participate.
*/
scope?: ScopeKey
/** Explicit control signal for the turn that requested this assembly, when any. */
signal?: AbortSignal
}
```
## 工具提供方结果
`ToolProviderResult.schemas` 是当前组装中对模型可见的工具 schema 集合。`knownNames` 是提供方在限制前的名称全集，用于区分「配置名拼写错误」与「已知工具在此作用域中被有意隐藏」。
```ts type-equiv
/** Tool schemas visible in one assembly and their pre-restriction name set. */
interface ToolProviderResult {
/** The schemas this provider contributes to THIS assembly. */
readonly schemas: readonly ToolSchema[]
/** The pre-restriction name universe for config validation (defaults to `schemas`' names). */
readonly knownNames?: readonly string[]
}
```
## 提示词段落
`PromptSection` 是一份只读的同进程注册约定。其文本可以是静态的，也可以从当前组装上下文动态解析。协作式组装完成后，一个有效的 `complete` 段会成为唯一的提示词段落。
```ts type-equiv
/** One contributed section of the system prompt (registry input). */
interface PromptSection {
/** Unique name — a duplicate registration throws (see {@link SystemPrompt.section}). */
readonly name: string
/**
* Sections are concatenated in ascending order. Convention: `-100` is the
* harness identity, `0` the deployment persona, tool guidance uses 100–199;
* other negative orders also render before the persona.
*/
readonly order: number
/**
* Static text or a provider evaluated at each assembly with that assembly's
* {@link AssembleContext}. The text may reference `{{variable}}`s — they are
* interpolated later, by {@link renderPrompt}.
*/
readonly text: string | ((context: AssembleContext) => string)
/**
* Treat this contribution as the complete system prompt. Assembly still
* runs the cooperative waterfall so tools, contexts, and variables can be
* resolved, then restores this exact section as the sole prompt section.
* More than one effective complete section makes assembly fail.
*/
readonly complete?: boolean
}
```
## 动态提示词上下文
`PromptContext` 是与 `PromptSection` 对应的缓存安全结构。组装会解析这些贡献并排序；agent loop（智能体循环）仅在完整当前快照发生变化或被压缩（compaction）移除时，才会将其记录在保留的模型历史之后。
```ts type-equiv
/** Dynamic model context materialized as a durable user-role snapshot. */
interface PromptContext {
/** Unique name — a duplicate registration throws (see {@link SystemPrompt.context}). */
readonly name: string
/** Contexts are joined in ascending order. */
readonly order: number
/** Static text or a provider evaluated for each assembly. Empty text contributes nothing. */
readonly text: string | ((context: AssembleContext) => string)
}
```
## Cordis API
Generated from source by `scripts/gen-cordis-catalog.ts` (verified fresh by `pnpm run verify-cordis-catalog` in doc-sync; regenerate with `pnpm run gen-cordis-catalog`) — this section is byte-identical in both language sides of the page. Signature blocks use a `ts cordis-catalog` fence and keep the original source JSDoc; dispatch modes are defined in the [primer](../cordis-primer.md#dispatch-modes), and the framework-inherited `ctx` API lives in [cordis-api/inherited.md](../cordis-api/inherited.md).
### `ctx.systemPrompt` — `SystemPrompt`
Registry service for the prompt inputs assembled before each model step.
```ts cordis-catalog
/**
* Register an ordered prompt section in the calling context's scope. A scoped
* section shadows a global section with the same name; duplicates within one
* layer and non-finite orders throw. Registration and disposal emit
* `system-prompt/change`.
* @param section - the section to register.
* @returns the exact Cordis effect disposer.
*/
section(section: PromptSection): () => void
/**
* Register ordered dynamic context in the calling context's scope. Scoped
* entries shadow global entries with the same name.
* @param context - the context contribution to register.
* @returns the exact Cordis effect disposer.
*/
context(context: PromptContext): () => void
/**
* Register a tool-schema provider in the calling context's scope. Global and
* matching scoped providers both contribute; returning the reserved
* {@link TOOL_ORDER_REST} name makes assembly fail.
* @param provider - evaluated for each assembly with its context.
* @returns the exact Cordis effect disposer.
*/
tools(provider: (context: AssembleContext) => ToolProviderResult): () => void
/**
* Register a prompt variable in the calling context's scope. Scoped values
* shadow globals; invalid or duplicate names throw. A provider may return
* `undefined`, but rendering a section that references that value then fails.
* @param name - the `[a-z][a-z0-9_]*` reference name.
* @param provider - evaluated for each assembly.
* @returns the exact Cordis effect disposer.
*/
variable(name: string, provider: (context: AssembleContext) => string | undefined): () => void
/**
* Assemble global and scoped providers, detach tool parameters, apply
* canonical ordering, then run the assembly waterfall. Scoped sections and
* variables shadow globals. The returned waterfall value is authoritative
* except that an effective complete section is restored afterwards as the
* sole prompt section.
* @param context - the optional scope and plugin-defined assembly fields.
* @returns the post-waterfall assembly with any complete prompt enforced.
*/
async assemble(context: AssembleContext = {}): Promise
```
Source: [`packages/core/system-prompt/src/index.ts:334`](../../packages/core/system-prompt/src/index.ts)
### `system-prompt/*` events
#### `system-prompt/assemble` — waterfall
Expert waterfall over the assembled sections, contexts, tools, and variables. Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): scoped listeners receive only that scope's assemblies. The returned value is authoritative. A supplied signal controls only this explicit assembly request and must not be retained to control later turns. A registered complete section is restored after this waterfall, so listeners cannot add to or replace that scope's system prompt.
```ts cordis-catalog
/**
* Expert waterfall over the assembled sections, contexts, tools, and variables.
* Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): scoped listeners
* receive only that scope's assemblies. The returned value is authoritative.
* A supplied signal controls only this explicit assembly request and must not
* be retained to control later turns. A registered complete section is
* restored after this waterfall, so listeners cannot add to or replace
* that scope's system prompt.
* @param assembly - the mutable assembly built from registered providers.
* @param context - the caller's per-assembly context.
* @mode waterfall
*/
'system-prompt/assemble'(this: Scoped, assembly: PromptAssembly, context: AssembleContext, next: () => Promise): Promise
```
Types: [Scoped](scope.md)
Source: [`packages/core/system-prompt/src/index.ts:31`](../../packages/core/system-prompt/src/index.ts)
#### `system-prompt/change` — emit
Emitted when any prompt provider changes. This registry notification is unfiltered because a global change affects every scope.
```ts cordis-catalog
/**
* Emitted when any prompt provider changes. This registry notification is
* unfiltered because a global change affects every scope.
* @mode emit
*/
'system-prompt/change'(): void
```
Source: [`packages/core/system-prompt/src/index.ts:37`](../../packages/core/system-prompt/src/index.ts)