feat(tui): select model reasoning effort

examples/tui-agent/README.md

@@ -17,7 +17,7 @@ Type a coding task. The agent works through the `read`/`write`/`edit` filesystem
 
 The `todo_write` task tracker is opt-in and not in the shipped config: add `@deepseek-ai/dsh-tool-todo` to `cordis.yml` (or a personal-config overlay under `~/.dsh`) to expose it. Once loaded, the model records a whole-list plan to the session log and the TUI renders it.
 
-The TUI renders Markdown history, reasoning, tool-owned terminal/diff/generic cards, token totals, and — when `todo_write` is loaded — the latest plan. Long tool bodies keep a head/tail preview; Ctrl+O expands or collapses every card. Enter submits or steers while the agent runs, Ctrl+R toggles reasoning, Escape cancels, and `/help` lists commands. `/plan` selects plan mode for the next step; `/plan <message>` also submits the message into that step, while `/plan off` selects the default mode without model input. `/status` expands the current session's identity, activity counts, exact token/cache buckets, context use, and timestamps without interrupting a running turn. `/model` opens a keyboard selector for the current provider catalog; use Up/Down and Enter, or `/model <model>` and `/model <provider>/<model>` for direct selection. `ask_user_question` opens a wide bottom-left keyboard panel with batch progress and numbered options.
+The TUI renders Markdown history, reasoning, tool-owned terminal/diff/generic cards, token totals, and — when `todo_write` is loaded — the latest plan. Long tool bodies keep a head/tail preview; Ctrl+O expands or collapses every card. Enter submits or steers while the agent runs, Ctrl+R toggles reasoning, Escape cancels, and `/help` lists commands. `/plan` selects plan mode for the next step; `/plan <message>` also submits the message into that step, while `/plan off` selects the default mode without model input. `/status` expands the current session's identity, activity counts, exact token/cache buckets, context use, and timestamps without interrupting a running turn. `/model` opens a keyboard selector for the current provider catalog; use Up/Down to focus a model, Shift+Tab to cycle its advertised reasoning efforts, and Enter to select, or use `/model <model>` and `/model <provider>/<model>` for direct selection. `ask_user_question` opens a wide bottom-left keyboard panel with batch progress and numbered options.
 
 ### Resuming a prior session
 

examples/tui-agent/tests/fixtures/tui-scripted-llm.ts

@@ -1,6 +1,12 @@
 import type { Context } from 'cordis'
-import type { GenerateOptions, LlmModelContext, LlmModelInfo, StreamChunk } from '@deepseek-ai/dsh-llm'
-import { CallId, LlmAdapter } from '@deepseek-ai/dsh-llm'
+import type {
+  GenerateOptions,
+  LlmModelContext,
+  LlmModelInfo,
+  LlmModelReasoningInfo,
+  StreamChunk,
+} from '@deepseek-ai/dsh-llm'
+import { CallId, LlmAdapter, ReasoningEffortId } from '@deepseek-ai/dsh-llm'
 
 const CONTROL_PROBE = '\u001b]2;MODEL_CONTROLLED\u0007\u001b[999CMODEL_CURSOR\u009b31mMODEL_C1'
 const INITIAL_TEXT = `I need one decision before I continue. ${CONTROL_PROBE}`
@@ -39,6 +45,20 @@ class ScriptedTuiAdapter extends LlmAdapter {
     return Promise.resolve({ contextWindow: 128_000 })
   }
 
+  override resolveModelReasoning(
+    _provider: string,
+    model: string,
+  ): Promise<LlmModelReasoningInfo | undefined> {
+    if (model !== 'tui-scripted-model-pro') return Promise.resolve(undefined)
+    return Promise.resolve({
+      efforts: [
+        { id: ReasoningEffortId('high'), name: 'High' },
+        { id: ReasoningEffortId('max'), name: 'Max' },
+      ],
+      defaultEffort: ReasoningEffortId('high'),
+    })
+  }
+
   override async * stream(options: GenerateOptions): AsyncIterable<StreamChunk> {
     // The session-title provider's auxiliary request carries no tool schemas,
     // unlike every agent turn; answer it with a fixed title so the PTY test can
@@ -47,8 +67,12 @@ class ScriptedTuiAdapter extends LlmAdapter {
       for (const chunk of textChunks(TITLE_TEXT)) yield chunk
       return
     }
-    if (options.model !== 'tui-scripted-model-pro' || !options.system?.includes('tui-scripted-model-pro')) {
-      throw new Error('the scripted TUI request did not apply the selected model to routing and prompt variables')
+    if (
+      options.model !== 'tui-scripted-model-pro'
+      || !options.system?.includes('tui-scripted-model-pro')
+      || options.reasoningEffort !== ReasoningEffortId('max')
+    ) {
+      throw new Error('the scripted TUI request did not apply the selected model and reasoning effort')
     }
     const lastMessage = options.messages.at(-1)
     const lastText = (lastMessage?.content ?? [])

examples/tui-agent/tests/tui-keyless-smoke.e2e.ts

@@ -104,7 +104,7 @@ function smoke(overrides: Partial<TuiPtySmokeOptions> & { label: string }): Prom
 // other route (see fixtures/tui-scripted-llm.ts).
 const SELECT_PRO_MODEL = [
   { waitFor: 'scripted TUI ready.', send: '/model\r' },
-  { waitFor: 'Select model', send: '\x1b[B\r' },
+  { waitFor: 'Select model', send: '\x1b[B\x1b[Z\r' },
 ] as const
 
 describe('tui-agent keyless smoke (real Loader tree in a PTY)', () => {
@@ -157,6 +157,7 @@ describe('tui-agent keyless smoke (real Loader tree in a PTY)', () => {
       ],
     })
     expect(output).toContain('I need one decision before I continue.')
+    expect(output).toContain('Reasoning effort: Max.')
     expect(output).toContain('Entering plan mode (applies from the next step). Use /plan off to leave.')
     expect(output).toContain('Leaving plan mode (applies from the next step).')
     expect(output).toContain('Default mode confirmed.')