fix(headless): dsh run is a direct core front door

packages/core/agent-default-model/README.i18n.yaml

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+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/core/agent-default-model/README.md
+README.md: 02bcc9be3adee2293a20b3ae87ddaf4d52e70deb
+README.zh.md: 807b612bd25e49aa318c13c8c8dc7595a6459080

packages/core/agent-default-model/README.md

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+# @deepseek-ai/dsh-agent-default-model
+
+English | [中文](README.zh.md)
+
+The deployment default used when a front door creates an Agent that has no session-local model selection. `AgentDefaultModelService` provides `ctx.agentDefaultModel`; direct front doors such as `dsh run` and Host-backed front doors such as ApiProxy read the same service instead of owning parallel provider/model defaults.
+
+The plugin config requires `{ provider, model }`. That composition entry is the base of the `agent-default-model` Settings section; a mounted settings provider layers the user's choice over it and changes are visible on the next `currentSelection()` read. `reasoningEffort` belongs to the Settings section but deliberately not to plugin config: a complete saved selection can clear an effort when the next selected model has none, while a composition value would be inherited again.
+
+- `ctx.agentDefaultModel.currentSelection()` returns a detached `{ provider, model, reasoningEffort? }` selection for a newly created Agent.
+- `ctx.agentDefaultModel.saveSelection(selection)` saves the complete user selection. Without a settings provider it is a no-op and the composition entry remains current.
+
+The service does not validate catalog membership. A provider route may serve an unadvertised model, and the consumer that actually opens a model request owns availability diagnostics.
+
+## Model Experience
+
+Indirectly, through the provider/model selection supplied to a front door; request assembly and adapters own the model-visible request.
+
+#### KV Cache effect
+
+Changing the default affects only Agents that subsequently resolve from it. An existing session whose request log already names a selection keeps that selection, so this service does not invalidate its established prefix.
+
+## Known Limitations and Deferred Work
+
+- The service owns one process-wide default; per-session selection remains the front door's responsibility.
+- Without a settings provider, `saveSelection()` cannot retain a selection for a later Agent.

packages/core/agent-default-model/README.zh.md

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+# @deepseek-ai/dsh-agent-default-model
+
+[English](README.md) | 中文
+
+该部署默认值供入口在创建尚无会话级模型选择的 Agent 时使用。`AgentDefaultModelService` 提供 `ctx.agentDefaultModel`；`dsh run` 这类直接入口与 ApiProxy 这类由 Host 支撑的入口读取同一服务，而不是分别持有平行的提供方／模型默认值。
+
+插件配置必须提供 `{ provider, model }`。该组合配置项构成 Settings 中 `agent-default-model` 分节的基础层；挂载的设置提供方在其上叠加用户选择，更改会在下一次调用 `currentSelection()` 时可见。`reasoningEffort` 属于该 Settings 分节，但特意不属于插件配置：完整保存的选择必须能在下一个选定模型没有推理（reasoning）强度时清除旧值，而组合配置值会再次被继承。
+
+- `ctx.agentDefaultModel.currentSelection()` 返回一份独立的 `{ provider, model, reasoningEffort? }` 选择，供新创建的 Agent 使用。
+- `ctx.agentDefaultModel.saveSelection(selection)` 保存完整的用户选择。未挂载设置提供方时，此调用不执行任何操作，组合配置项仍为当前值。
+
+该服务不校验目录成员关系。提供方路由可以服务未在目录中公布的模型；实际发起模型请求的消费方负责可用性诊断。
+
+## 模型体验
+
+通过提供给入口的提供方／模型选择间接影响；模型可见请求由请求组装与适配器负责。
+
+#### KV Cache 影响
+
+更改默认值只影响之后从该默认值解析选择的 Agent。请求日志已经指明选择的现有会话仍沿用该选择，因此本服务不会使其已建立的前缀失效。
+
+## 已知限制与暂缓事项
+
+- 该服务只拥有一项进程级默认值；每个会话的选择仍由入口负责。
+- 未挂载设置提供方时，`saveSelection()` 无法保留选择供后续 Agent 使用。

packages/core/agent-default-model/package.json

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+{
+  "name": "@deepseek-ai/dsh-agent-default-model",
+  "description": "Default model selection shared by Agent front doors",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./src/*": "./src/*",
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts"
+  ],
+  "license": "BSD-3-Clause",
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "peerDependencies": {
+    "@deepseek-ai/dsh-agent": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-llm": "^0.0.1",
+    "@deepseek-ai/dsh-settings": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "devDependencies": {
+    "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-settings": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/core/agent-default-model/src/index.ts

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+/**
+ * Default model selection for an Agent without a session-specific selection.
+ *
+ * @module @deepseek-ai/dsh-agent-default-model
+ */
+
+import { Context, Service } from 'cordis'
+import z from 'schemastery'
+import type { ModelSelection } from '@deepseek-ai/dsh-agent'
+import { ReasoningEffortId } from '@deepseek-ai/dsh-llm'
+import { installSettingsSection, settingsNamespace } from '@deepseek-ai/dsh-settings'
+
+declare module 'cordis' {
+  interface Context {
+    /** Default model selection for Agents created without an explicit model. */
+    agentDefaultModel: AgentDefaultModelService
+  }
+}
+
+/** Settings namespace carrying the default model selection for future Agents. */
+export const AGENT_DEFAULT_MODEL_SETTINGS_NAMESPACE = settingsNamespace('agent-default-model')
+
+/** Stored and composed default model selection. */
+export interface AgentDefaultModelSettings {
+  /** Registered provider route. */
+  provider: string
+  /** Provider-owned model id. */
+  model: string
+  /** Adapter-owned reasoning effort, or provider/default behavior when absent. */
+  reasoningEffort?: string
+}
+
+/** Schema of the default Agent model settings section. */
+export const AGENT_DEFAULT_MODEL_SETTINGS_SCHEMA: z<AgentDefaultModelSettings> = z.object({
+  provider: z.string().required(),
+  model: z.string().required(),
+  reasoningEffort: z.string(),
+})
+
+/** Composition entry for the default model selection. */
+export interface Config {
+  /** Registered provider route. */
+  provider: string
+  /** Provider-owned model id. */
+  model: string
+}
+
+/** Project stored settings onto the Agent-facing selection type. */
+function selection(settings: AgentDefaultModelSettings): ModelSelection {
+  return {
+    provider: settings.provider,
+    model: settings.model,
+    ...settings.reasoningEffort === undefined
+      ? {}
+      : { reasoningEffort: ReasoningEffortId(settings.reasoningEffort) },
+  }
+}
+
+/**
+ * Owns the default model selection independently of any Host or transport.
+ * The composition entry remains usable without a settings provider; when one
+ * is mounted, its user layer is read live.
+ */
+export class AgentDefaultModelService extends Service {
+  static Config: z<Config> = z.object({
+    provider: z.string().required(),
+    model: z.string().required(),
+  })
+
+  private source: () => AgentDefaultModelSettings
+
+  constructor(ctx: Context, config: Config) {
+    super(ctx, 'agentDefaultModel')
+    const entry: AgentDefaultModelSettings = { provider: config.provider, model: config.model }
+    this.source = () => entry
+    installSettingsSection(ctx, AGENT_DEFAULT_MODEL_SETTINGS_NAMESPACE, AGENT_DEFAULT_MODEL_SETTINGS_SCHEMA, entry, {
+      setSource: (current) => { this.source = current },
+      // Every consumer reads through currentSelection(), so no registration-level fact
+      // needs rebuilding when the settings document changes.
+      onChange: () => {},
+    })
+  }
+
+  /**
+   * Read the current default model selection.
+   * @returns a detached provider, model, and optional reasoning selection.
+   */
+  currentSelection(): ModelSelection {
+    return selection(this.source())
+  }
+
+  /**
+   * Save the complete default model selection. A deployment without a settings
+   * provider keeps its composition entry.
+   * @param next - resolved selection accepted by a front door.
+   * @returns fulfillment after the optional settings write settles.
+   */
+  async saveSelection(next: ModelSelection): Promise<void> {
+    await this.ctx.get('settings')?.replace(AGENT_DEFAULT_MODEL_SETTINGS_NAMESPACE, {
+      provider: next.provider,
+      model: next.model,
+      ...next.reasoningEffort === undefined ? {} : { reasoningEffort: String(next.reasoningEffort) },
+    })
+  }
+}
+
+export default AgentDefaultModelService

packages/core/agent-default-model/src/invariant.ts

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+/**
+ * Package-owned invariant companion for the default Agent model selection.
+ *
+ * The service owns no independent event relationship: settings registration
+ * already validates every mutable value before `currentSelection()` can observe it.
+ * The empty installer keeps that absence explicit in composed invariant sets.
+ *
+ * @module @deepseek-ai/dsh-agent-default-model/invariant
+ */
+
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-agent-default-model'
+
+/** Cordis companion plugin name. */
+export const name = 'agent-default-model-invariant'
+/** Services required before the companion can register. */
+export const inject = ['invariants']
+
+/** No runtime invariant: settings validation owns the only mutable-value relationship. */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register the intentionally empty invariant contribution.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))

packages/core/agent-default-model/tests/agent-default-model.spec.ts

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+/** Default Agent model settings layered over a real settings provider. */
+
+import { describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import AgentDefaultModelService, { AGENT_DEFAULT_MODEL_SETTINGS_NAMESPACE } from '../src/index.ts'
+import { Settings } from '@deepseek-ai/dsh-settings'
+import type { SettingsNamespace } from '@deepseek-ai/dsh-settings'
+import { ReasoningEffortId } from '@deepseek-ai/dsh-llm'
+
+/** The smallest real provider: one in-memory document, always writable. */
+class MemorySettings extends Settings {
+  doc: Record<string, unknown> = {}
+
+  get writable(): boolean {
+    return true
+  }
+
+  protected load(): Promise<Record<string, unknown>> {
+    return Promise.resolve(structuredClone(this.doc))
+  }
+
+  protected persist(ns: SettingsNamespace, section: Record<string, unknown>): Promise<void> {
+    this.doc = { ...this.doc, [ns]: structuredClone(section) }
+    return Promise.resolve()
+  }
+}
+
+async function boot(): Promise<{
+  ctx: Context
+  settingsFiber: Context['fiber']
+  defaultModel: AgentDefaultModelService
+}> {
+  const ctx = new Context()
+  const settingsFiber = ctx.plugin(MemorySettings)
+  await settingsFiber.await()
+  await ctx.plugin(AgentDefaultModelService, {
+    provider: 'deepseek-official',
+    model: 'deepseek-v4-flash',
+  })
+  return { ctx, settingsFiber, defaultModel: ctx.agentDefaultModel }
+}
+
+describe('AgentDefaultModelService', () => {
+  it('resolves the user layer over the composition entry', async () => {
+    const bench = await boot()
+    expect(bench.defaultModel.currentSelection()).toEqual({
+      provider: 'deepseek-official', model: 'deepseek-v4-flash',
+    })
+
+    await bench.defaultModel.saveSelection({
+      provider: 'acme-gateway', model: 'acme-large', reasoningEffort: ReasoningEffortId('high'),
+    })
+    expect(bench.defaultModel.currentSelection()).toEqual({
+      provider: 'acme-gateway', model: 'acme-large', reasoningEffort: 'high',
+    })
+    await bench.ctx.fiber.dispose()
+  })
+
+  it('clears a stored effort when the saved selection has none', async () => {
+    const bench = await boot()
+    await bench.defaultModel.saveSelection({
+      provider: 'acme-gateway', model: 'acme-large', reasoningEffort: ReasoningEffortId('high'),
+    })
+    await bench.defaultModel.saveSelection({ provider: 'acme-gateway', model: 'acme-plain' })
+    expect(bench.defaultModel.currentSelection()).toEqual({ provider: 'acme-gateway', model: 'acme-plain' })
+    await bench.ctx.fiber.dispose()
+  })
+
+  it('layers a hand-written partial section over the entry', async () => {
+    const bench = await boot()
+    await bench.settingsFiber.ctx.settings.replace(AGENT_DEFAULT_MODEL_SETTINGS_NAMESPACE, {
+      model: 'deepseek-reasoner',
+    })
+    expect(bench.defaultModel.currentSelection()).toEqual({
+      provider: 'deepseek-official', model: 'deepseek-reasoner',
+    })
+    await bench.ctx.fiber.dispose()
+  })
+
+  it('falls back to the composition entry when the settings provider detaches', async () => {
+    const bench = await boot()
+    await bench.defaultModel.saveSelection({ provider: 'acme-gateway', model: 'acme-large' })
+    expect(bench.defaultModel.currentSelection().provider).toBe('acme-gateway')
+    await bench.settingsFiber.dispose()
+    expect(bench.defaultModel.currentSelection()).toEqual({
+      provider: 'deepseek-official', model: 'deepseek-v4-flash',
+    })
+    await bench.ctx.fiber.dispose()
+  })
+
+  it('keeps the composition entry when no settings provider is mounted', async () => {
+    const ctx = new Context()
+    await ctx.plugin(AgentDefaultModelService, { provider: 'p', model: 'm' })
+    await ctx.agentDefaultModel.saveSelection({ provider: 'other', model: 'other' })
+    expect(ctx.agentDefaultModel.currentSelection()).toEqual({ provider: 'p', model: 'm' })
+    await ctx.fiber.dispose()
+  })
+})

packages/core/agent-default-model/tsconfig.json

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+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": [
+    "src"
+  ],
+  "references": [
+    {
+      "path": "../../../vendor/cordis"
+    },
+    {
+      "path": "../../../vendor/schemastery"
+    },
+    {
+      "path": "../../core/agent"
+    },
+    {
+      "path": "../../llm/llm"
+    },
+    {
+      "path": "../../settings/settings"
+    },
+    {
+      "path": "../../support/invariants"
+    }
+  ]
+}

packages/core/agent-default-model/tsdown.config.ts

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+import { defineConfig } from 'tsdown'
+
+/** Build the package root and invariant companion as independent bundles. */
+export default defineConfig([
+  {
+    entry: ['lib/types/index.js'],
+    outDir: 'lib',
+    format: ['esm'],
+    platform: 'node',
+    target: 'es2024',
+    fixedExtension: false,
+    dts: false,
+    clean: false,
+  },
+  {
+    entry: ['lib/types/invariant.js'],
+    outDir: 'lib',
+    format: ['esm'],
+    platform: 'node',
+    target: 'es2024',
+    fixedExtension: false,
+    dts: false,
+    clean: false,
+  },
+])