fix(session): preserve automatic reasoning effort on selection

packages/api/session-controller/README.i18n.yaml

@@ -21,8 +21,8 @@
   en: 41bdda1ac32df558
   zh: aa5d0e325924066b
 /session-controller/session-media-references:
-  en: 9449c5c3a53031c6
-  zh: 68d8ad0d3632983a
+  en: 49a3d0e8e92017d3
+  zh: 91302aa3dd6e9378
 /session-controller/configuration:
   en: 5ae2b340c630897f
   zh: 1ffbd61ecf302ec2

packages/api/session-controller/README.md

@@ -90,7 +90,7 @@ References keep local Session data, scoped Contexts, and history streams alive,
 
 GUI model selection requires the exact provider/model pair in the available catalog; unavailable choices reject with `session/model-unavailable`. Prompt admission retains the saved route without a catalog availability gate, so request execution reports missing credentials or unavailable models. `initializeDefaultModel()` saves the first available account model after login when no other provider has a configured API key; credential checks use configured references independently of model availability. A provider with no available models rejects initialization with `session/provider-models-unavailable`. Availability never substitutes another model or rewrites a Session selection.
 
-A successful `selectModel` response acknowledges the recorded Session selection without waiting for the default profile setting to save. The loop registers its projection; a change applies to the next step while a prepared step retains its captured choice. Default saves run in the background in submission order; a failure logs a warning and leaves the Session selection intact. A Session with no recorded selection or request reads the last successfully saved default through live `AgentOptions` accessors. An explicit choice is recorded even when it equals that default.
+A successful `selectModel` response acknowledges the recorded Session selection without waiting for the default profile setting to save. The loop registers its projection; a change applies to the next step while a prepared step retains its captured choice. Default saves run in the background in submission order; a failure logs a warning and leaves the Session selection intact. A Session with no recorded selection or request reads the last successfully saved default through live `AgentOptions` accessors. An explicit choice is recorded even when it equals that default. Omitting reasoning effort clears the explicit effort and lets each request use the adapter default.
 
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packages/api/session-controller/README.zh.md

@@ -90,7 +90,7 @@ Client 的首次 `follow`、重连首屏与 `loadOlder()` 至少请求 50 条以
 
 GUI 模型选择要求确切提供方／模型对出现在可用目录中；不可用的选择以 `session/model-unavailable` 拒绝。提示词准入保留已保存的路由，不按目录可用性阻断发送，由请求执行报告凭据缺失或模型不可用。`initializeDefaultModel()` 在账号登录后、其他提供方均未配置 API key 时，将第一个可用账号模型保存为默认模型；凭据检查使用已配置的引用，不依赖模型是否可用。提供方没有可用模型时，初始化以 `session/provider-models-unavailable` 拒绝。可用性变化不会替换模型或改写会话选择。
 
-`selectModel` 成功返回表示会话模型选择已记录，不等待默认 profile 设置保存。循环注册该投影；变更从下一个步骤开始生效，已准备的步骤保留捕获的选择。默认设置在后台按提交顺序保存；保存失败会记录警告，并保留会话选择。尚未记录选择或请求的会话通过 `AgentOptions` 的动态访问器读取最近一次成功保存的默认值。显式选择即使与默认值相同也会记录。
+`selectModel` 成功返回表示会话模型选择已记录，不等待默认 profile 设置保存。循环注册该投影；变更从下一个步骤开始生效，已准备的步骤保留捕获的选择。默认设置在后台按提交顺序保存；保存失败会记录警告，并保留会话选择。尚未记录选择或请求的会话通过 `AgentOptions` 的动态访问器读取最近一次成功保存的默认值。显式选择即使与默认值相同也会记录。省略推理强度会清除显式强度，让每次请求使用适配器默认值。
 
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packages/api/session-controller/src/commands.ts

@@ -159,20 +159,14 @@ export class SessionCommandController {
     return this.agents.serializeImageAdmission(agent, async () => {
       try {
         await this.requireModel(request)
-        const resolved = await this.ctx.llm.resolveCallConfig({
+        const selected: AgentModelSelection = {
           provider: request.provider,
           model: request.model,
           ...(request.reasoningEffort === undefined
             ? {}
             : { reasoningEffort: ReasoningEffortId(request.reasoningEffort) }),
-        })
-        const selected: AgentModelSelection = {
-          provider: resolved.provider,
-          model: resolved.model,
-          ...(resolved.reasoningEffort === undefined
-            ? {}
-            : { reasoningEffort: resolved.reasoningEffort }),
         }
+        await this.ctx.llm.resolveCallConfig(selected)
         agent.model.select(selected)
         void this.ctx.agentDefaultModel.saveSelection(selected).catch((error: unknown) => {
           this.ctx.logger.warn(

packages/api/session-controller/tests/session-models.host.spec.ts

@@ -706,9 +706,10 @@ describe('Web session model selection', () => {
     const stillAccepted = expectValue(await remote.selectModel(request({
       sessionId, provider: 'deepseek-official', model: 'deepseek-chat',
     })))
-    expect(stillAccepted.selected).toEqual({ provider: 'deepseek-official', model: 'deepseek-chat', reasoningEffort: 'high' })
+    expect(stillAccepted.selected).toEqual({ provider: 'deepseek-official', model: 'deepseek-chat' })
     expect(currentSelection(ctx, sessionId))
-      .toEqual({ provider: 'deepseek-official', model: 'deepseek-chat', reasoningEffort: 'high' })
+      .toEqual({ provider: 'deepseek-official', model: 'deepseek-chat' })
+    expect(saved[1]).toEqual({ provider: 'deepseek-official', model: 'deepseek-chat' })
     await expect.poll(() => warn.mock.calls).toContainEqual([
       'session-controller: model selection changed for the Session but the default was not saved: Error: read-only document',
     ])