fix(web): show only model in agent tab title (#2043)

apps/web/components/task/session-tab-title.test.ts

@@ -96,13 +96,23 @@ describe("resolveSessionTabTitle", () => {
 });
 
 describe("resolveSessionTabTitle fallbacks", () => {
-  it("includes non-model config selections in the title", () => {
+  it("excludes non-model config selections from the title", () => {
     expect(
       resolveSessionTabTitle({
         ...baseArgs,
         agentLabel: null,
         activeModelId: SPARK_MODEL_ID,
         configOptions: [
+          {
+            type: "select",
+            id: "mode",
+            name: "Mode",
+            currentValue: "default",
+            options: [
+              { value: "default", name: "Default" },
+              { value: "plan", name: "Plan" },
+            ],
+          },
           {
             type: "select",
             id: "model",
@@ -125,7 +135,7 @@ describe("resolveSessionTabTitle fallbacks", () => {
           },
         ],
       }),
-    ).toBe(`${SPARK_MODEL_NAME} / High`);
+    ).toBe(SPARK_MODEL_NAME);
   });
 
   it("falls back to the agent label when live model state is unavailable", () => {

apps/web/components/task/session-tab-title.ts

@@ -33,11 +33,7 @@ function resolveModelTitle(
     // active/current model switches are reflected immediately in the tab title.
     modelLabel = optionName(modelConfig, modelId);
   }
-  const extras = args.configOptions
-    .filter((option) => !isModelConfigOption(option))
-    .map((option) => optionName(option, option.currentValue))
-    .filter(Boolean);
-  return [modelLabel, ...extras].join(" / ");
+  return modelLabel;
 }
 
 export function resolveSessionTabTitle(args: ResolveSessionTabTitleArgs): string | null {

apps/web/e2e/tests/chat/mobile-model-selector.spec.ts

@@ -79,6 +79,7 @@ test.describe("Mobile chat model selector", () => {
     testPage,
     apiClient,
     seedData,
+    prCapture,
   }, testInfo) => {
     const { task } = await seedAndOpenTask(testPage, apiClient, seedData);
     expect(task.session_id).toBeTruthy();
@@ -164,6 +165,9 @@ test.describe("Mobile chat model selector", () => {
       body: await testPage.screenshot(),
       contentType: "image/png",
     });
+    await prCapture.screenshot("mobile-model-selector", {
+      caption: "Mobile model selector remains reachable by touch",
+    });
 
     const viewport = testPage.viewportSize();
     expect(viewport).not.toBeNull();

apps/web/e2e/tests/chat/model-selector-error.spec.ts

@@ -172,6 +172,7 @@ test.describe("Chat model selector — persistence", () => {
     testPage,
     apiClient,
     seedData,
+    prCapture,
   }) => {
     const task = await apiClient.createTaskWithAgent(
       seedData.workspaceId,
@@ -197,7 +198,10 @@ test.describe("Chat model selector — persistence", () => {
     await expect(trigger).toContainText("Mock Smart", { timeout: 5_000 });
 
     const agentTab = session.sessionTabBySessionId(task.session_id);
-    await expect(agentTab).toContainText("Mock Smart", { timeout: 5_000 });
+    await expect(agentTab).toHaveText("Mock Smart", { timeout: 5_000 });
+    await prCapture.screenshot("desktop-agent-tab-model-only", {
+      caption: "Desktop agent tab shows only the selected model",
+    });
     await expect
       .poll(async () => {
         const { sessions } = await apiClient.listTaskSessions(task.id);
@@ -219,7 +223,7 @@ test.describe("Chat model selector — persistence", () => {
     await session.waitForLoad();
     await session.waitForChatIdle({ timeout: 30_000 });
     await expect(trigger).toContainText("Mock Smart", { timeout: 15_000 });
-    await expect(agentTab).toContainText("Mock Smart", { timeout: 15_000 });
+    await expect(agentTab).toHaveText("Mock Smart", { timeout: 15_000 });
   });
 
   test("completed turn metadata keeps changed options after a page reload", async ({

docs/plans/agent-tab-model-only/plan.md

@@ -0,0 +1,61 @@
+---
+spec: docs/specs/ui/acp-model-configuration-summary.md
+created: 2026-07-29
+status: complete
+---
+
+# Implementation Plan: Model-only Agent Tab Title
+
+## Overview
+
+PR [#2021](https://github.com/kdlbs/kandev/pull/2021) made unnamed agent tabs follow the
+authoritative live model across model switches and task-detail reloads. Its title resolver also
+appends every non-model ACP config value, producing labels such as
+`GPT-5.6-Terra / Default / High / Off`. Narrow the derived tab title to the model display name while
+preserving the PR's live-state precedence, reload behavior, and custom-name override.
+
+## Frontend
+
+### Agent tab title resolver
+
+- Update `apps/web/components/task/session-tab-title.ts` so `resolveModelTitle` resolves only the
+  provider-supplied display name for the chosen model.
+- Continue using the live model config option to identify and display the authoritative current
+  model before the active model, agent-profile fallback, and start-time snapshot fallbacks.
+- Keep user-supplied session names as the highest-precedence title.
+- Do not change `ModelConfigSelector`, the task-chat compact changed-value summary, tooltips, or
+  agent-profile selector labels.
+
+### Mobile design contract
+
+`SessionTab` is mounted only by `DockviewDesktopLayout`; `TaskLayout` routes phone and
+coarse-pointer tablet viewports to `SessionMobileLayout` and `SessionTabletLayout`. This copy-only
+change therefore has no mobile tab surface, navigation, touch, scroll, or geometry impact. The
+nearest mobile exemplar is the existing task mobile model selector, whose option access and compact
+summary remain unchanged. No new mobile Playwright case is required; the focused desktop rendered
+check proves the only affected surface.
+
+## Tests
+
+- **What:** A derived tab title contains the model display name and excludes non-model ACP config
+  values while preserving custom-name and fallback precedence.
+  **File:** `apps/web/components/task/session-tab-title.test.ts`.
+  **How:** Vitest table/fixture coverage around `resolveSessionTabTitle`, including live model,
+  mode, and effort options.
+
+## E2E Tests
+
+- **Scenario:** GIVEN an unnamed agent tab with provider mode and effort options, WHEN the user
+  switches to `Mock Smart`, THEN the tab text is exactly `Mock Smart`; WHEN the page reloads, THEN
+  the tab still contains only `Mock Smart`.
+  **File:** `apps/web/e2e/tests/chat/model-selector-error.spec.ts`.
+  **What to verify:** The stable session-ID tab locator has the exact model-only label before and
+  after reload, while the session model selector continues to show the selected model.
+
+## Implementation
+
+- [x] [Task 01: Render model-only agent tab titles](task-01-render-model-only-title.md)
+
+## Open Questions
+
+None.

docs/plans/agent-tab-model-only/task-01-render-model-only-title.md

@@ -0,0 +1,74 @@
+---
+id: "01-render-model-only-title"
+title: "Render model-only agent tab titles"
+status: done
+wave: 1
+depends_on: []
+plan: "plan.md"
+spec: "../../specs/ui/acp-model-configuration-summary.md"
+---
+
+# Task 01: Render Model-only Agent Tab Titles
+
+## Acceptance
+
+- An unnamed agent tab resolves to the authoritative current model display name without appending
+  session mode or non-model ACP config values.
+- A live model switch and task-detail reload retain the model-only title.
+- A user-supplied session name still overrides every derived title, and task-chat/profile model
+  selector summaries remain unchanged.
+
+## Verification
+
+```bash
+cd apps && rtk pnpm --filter @kandev/web test -- --run components/task/session-tab-title.test.ts
+cd apps/web && rtk pnpm e2e:run tests/chat/model-selector-error.spec.ts -- --grep "agent tab keeps the selected model title after reload"
+```
+
+## Files Likely Touched
+
+- `apps/web/components/task/session-tab-title.ts`
+- `apps/web/components/task/session-tab-title.test.ts`
+- `apps/web/e2e/tests/chat/model-selector-error.spec.ts`
+- `apps/web/e2e/tests/chat/mobile-model-selector.spec.ts` (PR evidence capture only)
+- `docs/specs/ui/acp-model-configuration-summary.md`
+- `docs/plans/agent-tab-model-only/plan.md`
+- `docs/plans/agent-tab-model-only/task-01-render-model-only-title.md`
+
+## Dependencies
+
+None.
+
+## Parallelism
+
+`sequential`. The resolver, its unit contract, and the existing persistence E2E form one focused
+behavioral change.
+
+## Inputs
+
+- Spec **What** and unnamed-agent-tab **Scenario**.
+- PR #2021 and its `resolveSessionTabTitle` precedence and reload regression.
+- Existing `SessionPage.sessionTabBySessionId` stable E2E locator.
+- `TaskLayout` mobile/tablet branching, which confirms this Dockview tab has no mobile surface.
+
+## TDD Sequence
+
+1. Change the non-model-config unit case to require the exact model-only label and run the focused
+   Vitest command to confirm RED.
+2. Remove non-model config composition from the derived model title without changing title
+   precedence or selector code, then rerun Vitest to GREEN.
+3. Tighten the existing model-switch persistence E2E to require the exact tab label before and
+   after reload, then run the managed focused E2E against freshly built assets.
+4. Mark this task `done`, mark the plan checkbox complete, and return the spec to `shipped`.
+
+## Risks
+
+- Model display names can come from either the model list or the live model config option; removing
+  the extra values must not bypass the provider-supplied model label.
+- Dockview restoration can reapply stale panel titles; the existing session-tab component sync and
+  reload E2E must continue proving the rendered tab wins.
+
+## Output Contract
+
+Report the expected RED assertion, resolver change, exact unit and E2E command results, files
+changed, mobile no-surface confirmation, remaining risks, and task/plan/spec status updates.

docs/specs/ui/acp-model-configuration-summary.md

@@ -20,7 +20,7 @@ ACP agents can advertise an arbitrary ordered set of model-adjacent session conf
 - Hovering or focusing the closed task selector shows a compact tooltip containing every currently rendered selector option as provider-supplied `Name: Value` rows, including baseline-matching values. The tooltip contains no descriptions or inferred provider knowledge. Opening the selector shows compact option names and selected values; entering an option submenu shows that option's provider description and the provider descriptions of its selectable values when supplied.
 - Kandev preserves optional ACP descriptions for both top-level config options and selectable values throughout the adapter, backend event, WebSocket, store, and selector pipeline. Missing descriptions produce no invented or hard-coded explanatory text.
 - Task-detail boot data includes the last persisted model list, live config options, and provider-default baseline so the compact label is complete on the first render instead of repainting after WebSocket reconnection.
-- An unnamed agent tab derives its title from the task session's authoritative current model and live config values. The title updates when the model changes and remains correct after a task-detail refresh; a user-supplied session name continues to override the derived title.
+- An unnamed agent tab derives its title from the task session's authoritative current model. Live config values may identify the current model, but non-model config values and the session mode are never appended to the tab title. The title updates when the model changes and remains correct after a task-detail refresh; a user-supplied session name continues to override the derived title.
 - Each turn stores an immutable configuration snapshot when the turn is created. The snapshot contains the effective model, mode, ordered selected config values with their provider-supplied display names, and the task-session provider-default baseline used for comparison. Agent-message metadata renders from this turn snapshot instead of the session's latest mutable runtime configuration.
 - Agent-message metadata always shows the attributed model and shows only non-model config values that differ from the turn's captured baseline. It keeps option names in the compact row because message attribution is read outside the selector context. Baseline-matching values and the session mode are omitted from the compact row; the mode remains available in turn metadata.
 - Prompt-usage metadata may refine the turn's attributed model when the provider reports the actual model used, but it does not replace the turn's captured config values or baseline.
@@ -40,7 +40,7 @@ ACP agents can advertise an arbitrary ordered set of model-adjacent session conf
 - **GIVEN** an ACP option or value supplies a description, **WHEN** the user enters that option's submenu, **THEN** Kandev shows the provider text. The closed trigger and top-level option list remain compact, and missing descriptions leave the description region absent.
 - **GIVEN** a task selector has current model and config values, **WHEN** the user hovers or focuses its closed trigger, **THEN** a compact tooltip lists every selector option as `Name: Value` without provider descriptions, including values omitted from the changed-only trigger label.
 - **GIVEN** a task session has persisted dynamic model configuration, **WHEN** the task-detail page is refreshed, **THEN** the first rendered selector label includes all changed values without waiting for a WebSocket event.
-- **GIVEN** an unnamed agent tab whose selected model changes during the session, **WHEN** the model update converges or the task-detail page is refreshed, **THEN** the existing tab title shows the current selected model instead of the agent profile's original model label.
+- **GIVEN** an unnamed agent tab whose selected model changes during the session, **WHEN** the model update converges or the task-detail page is refreshed, **THEN** the existing tab title shows only the current selected model instead of the agent profile's original model label or any session mode and non-model config values.
 - **GIVEN** turn A runs with reasoning `High`, **WHEN** reasoning changes to `Low` before turn B, **THEN** turn A continues to show `Reasoning effort: High` and turn B shows `Reasoning effort: Low`.
 - **GIVEN** a turn uses only provider-default options, **WHEN** its agent-message metadata renders, **THEN** the compact row shows only the attributed model.
 - **GIVEN** a legacy turn has no configuration snapshot, **WHEN** the session's runtime options later change, **THEN** the legacy turn does not display those current options.