feat(studio): remove the Agent Evaluations list page and its nav

web/packages/studio/src/constants/routes.ts

@@ -131,8 +131,6 @@ export const ROUTES = {
     agentDetail: `/workspaces/:${P.workspace}/agents/:${P.agentName}`,
     agentDeploymentsList: `/workspaces/:${P.workspace}/agent-deployments`,
     agentDeploymentDetail: `/workspaces/:${P.workspace}/agent-deployments/:${P.agentDeploymentName}`,
-    /** Agent-evaluation jobs list (Phase 2 of the agent-eval UX). */
-    agentEvaluationsList: `/workspaces/:${P.workspace}/agents/evaluations`,
     /** Detail view for a single agent-evaluation job. */
     agentEvaluationDetail: `/workspaces/:${P.workspace}/agents/evaluations/:${P.agentEvalJobName}`,
     modelCompare: `/workspaces/:${P.workspace}/playground`,

web/packages/studio/src/routes/WorkspaceLayout/WorkspaceSideNav.tsx

@@ -115,8 +115,8 @@ export const WorkspaceSideNav = ({ collapsed }: { collapsed?: boolean }) => {
     ];
     const datasetSubItems = [...anonymizerNav, ...dataDesignerNav, ...safeSynthesizerNav];
 
-    // Agents and Models link to their own entity list page; the chevron expands the rest.
-    const agentsHref = agentItems.length > 0 ? getAgentsListRoute(workspace) : undefined;
+    // Agents and Models link to their own entity list page; the chevron expands any sub-items.
+    const agentsHref = showAgents ? getAgentsListRoute(workspace) : undefined;
     const modelsHref = BASE_MODELS_ENABLED ? getWorkspaceBaseModelsRoute(workspace) : undefined;
 
     const componentItems = [

web/packages/studio/src/routes/agents/AgentEvaluationsRoute/AgentEvaluationDetailRoute.tsx

@@ -42,14 +42,14 @@ import { ROUTE_PARAMS } from '@studio/constants/routes';
 import { useWorkspaceFromPath } from '@studio/hooks/useWorkspaceFromPath';
 import { useBreadcrumbs } from '@studio/providers/breadcrumbs/useBreadcrumbs';
 import {
-  getAgentEvaluationsListRoute,
+  getAgentEvaluationsTabRoute,
   getAgentsListRoute,
   getFilesetRoute,
 } from '@studio/routes/utils';
 import { useRequiredPathParams } from '@studio/util/hooks/useRequiredPathParams';
 import { useQuery, useQueryClient } from '@tanstack/react-query';
 import { CircleX, ClipboardList, FlaskConical, ScrollText } from 'lucide-react';
-import { type FC, useState } from 'react';
+import { type FC, useEffect, useState } from 'react';
 import { Link } from 'react-router';
 
 const TERMINAL_STATUSES = new Set([
@@ -71,14 +71,6 @@ export const AgentEvaluationDetailRoute: FC = () => {
   const toast = useToast();
   const queryClient = useQueryClient();
 
-  useBreadcrumbs({
-    items: [
-      { slotLabel: 'Agents', href: getAgentsListRoute(workspace) },
-      { slotLabel: 'Evaluations', href: getAgentEvaluationsListRoute(workspace) },
-      { slotLabel: jobName },
-    ],
-  });
-
   // Job + status — refetched while the job is non-terminal so the badge stays
   // live without forcing a page reload.
   const { data: job, isLoading: isLoadingJob } = useQuery({
@@ -88,6 +80,22 @@ export const AgentEvaluationDetailRoute: FC = () => {
     refetchInterval: (query) => (isTerminal(query.state.data?.status) ? false : 5_000),
   });
 
+  // The "Evaluations" crumb links the agent's eval tab, but the agent name only arrives with
+  // the loaded job — so set breadcrumbs from an effect keyed on it (the useBreadcrumbs `items`
+  // param runs once on mount and would keep the crumb non-clickable after the job resolves).
+  const agentName = job ? agentNameForJob(job) : null;
+  const { setBreadcrumbs } = useBreadcrumbs();
+  useEffect(() => {
+    setBreadcrumbs([
+      { slotLabel: 'Agents', href: getAgentsListRoute(workspace) },
+      agentName
+        ? { slotLabel: 'Evaluations', href: getAgentEvaluationsTabRoute(workspace, agentName) }
+        : { slotLabel: 'Evaluations' },
+      { slotLabel: jobName },
+    ]);
+    return () => setBreadcrumbs([]);
+  }, [setBreadcrumbs, workspace, agentName, jobName]);
+
   const isJobTerminal = isTerminal(job?.status);
   const canCancelJob = !!job?.status && !isJobTerminal;
   const [cancelModalOpen, setCancelModalOpen] = useState(false);

web/packages/studio/src/routes/agents/AgentEvaluationsRoute/index.ts

@@ -2,4 +2,3 @@
 // SPDX-License-Identifier: Apache-2.0
 
 export { AgentEvaluationDetailRoute } from '@studio/routes/agents/AgentEvaluationsRoute/AgentEvaluationDetailRoute';
-export { AgentEvaluationsListRoute } from '@studio/routes/agents/AgentEvaluationsRoute/AgentEvaluationsListRoute';

web/packages/studio/src/routes/agents/AssistantChatRoute/artifacts.ts

@@ -49,7 +49,6 @@ const STUDIO_LINK_PATH_TEMPLATES: Record<string, string> = {
   agent_chat: '/workspaces/{workspace}/agents/{name}?tab=chat-playground',
   agent_deployments: '/workspaces/{workspace}/agents',
   agent_deployment: '/workspaces/{workspace}/agents/{name}',
-  agent_evaluations: '/workspaces/{workspace}/agents/evaluations',
   agent_evaluation: '/workspaces/{workspace}/agents/evaluations/{name}',
   agent_monitor: '/workspaces/{workspace}/agents/monitor',
   base_models: '/workspaces/{workspace}/base-models',

web/packages/studio/src/routes/agents/AssistantChatRoute/studioUiNavigationSuggestions.test.ts

@@ -111,13 +111,6 @@ describe('getStudioUiNavigationSuggestion', () => {
     });
   });
 
-  it('prefers agent-specific evaluation routes over general model evaluations', () => {
-    expect(getStudioUiNavigationSuggestion('Evaluate an agent', workspace)).toMatchObject({
-      id: 'agent-evaluations',
-      href: '/workspaces/default/agents/evaluations',
-    });
-  });
-
   it('returns undefined when the matching feature is disabled', () => {
     mockFeatureFlags({ guardrailsEnabled: false });
 

web/packages/studio/src/routes/agents/AssistantChatRoute/studioUiNavigationSuggestions.ts

@@ -4,7 +4,6 @@
 import { featureFlags } from '@studio/constants/featureFlags';
 import type { FeatureFlags } from '@studio/constants/featureFlags/featureFlags';
 import {
-  getAgentEvaluationsListRoute,
   getAgentMonitorRoute,
   getAgentsListRoute,
   getDataDesignerJobListRoute,
@@ -59,19 +58,6 @@ const STUDIO_UI_DESTINATIONS: readonly StudioUiDestination[] = [
       /\bsafety data\b/i,
     ],
   },
-  {
-    id: 'agent-evaluations',
-    title: 'Open Agent Evaluations',
-    description: 'Studio has a UI for submitting and reviewing agent evaluation jobs.',
-    getHref: getAgentEvaluationsListRoute,
-    requiredFeatureFlags: ['agentsEnabled'],
-    patterns: [
-      /\bagent (eval|evaluation|evaluations)\b/i,
-      /\bevaluat(e|ing|ion)s? (an? )?agent\b/i,
-      /\brun (an? )?(eval|evaluation) (for|on) (an? )?agent\b/i,
-      /\b(agent|agents).*\b(eval|evaluation|evaluations) jobs?\b/i,
-    ],
-  },
   {
     id: 'agent-monitor',
     title: 'Open Agent Monitor',

web/packages/studio/src/routes/groups/agentRoutes.tsx

@@ -5,12 +5,8 @@ import { ErrorPanel } from '@nemo/common/src/components/ErrorPanel';
 import { AGENTS_ENABLED, MONITOR_ENABLED } from '@studio/constants/environment';
 import { ROUTES } from '@studio/constants/routes';
 import { iconColorClass } from '@studio/routes/constants';
-import {
-  agentsRoutes,
-  getAgentEvaluationsListRoute,
-  getAgentMonitorRoute,
-} from '@studio/routes/utils';
-import { Form, DatabaseCheck } from 'lucide-react';
+import { agentsRoutes, getAgentMonitorRoute } from '@studio/routes/utils';
+import { DatabaseCheck } from 'lucide-react';
 import { lazy } from 'react';
 import type { RouteObject } from 'react-router';
 
@@ -33,13 +29,6 @@ const AgentMonitorRoute = lazy(() =>
     default: m.AgentMonitorRoute,
   }))
 );
-const AgentEvaluationsListRoute =
-  AGENTS_ENABLED &&
-  lazy(() =>
-    import('@studio/routes/agents/AgentEvaluationsRoute').then((m) => ({
-      default: m.AgentEvaluationsListRoute,
-    }))
-  );
 const AgentEvaluationDetailRoute =
   AGENTS_ENABLED &&
   lazy(() =>
@@ -63,11 +52,6 @@ export const agentRoutes: RouteObject[] = agentsRoutes([
         },
       ]
     : []),
-  {
-    path: ROUTES.workspace.agentEvaluationsList,
-    element: AgentEvaluationsListRoute ? <AgentEvaluationsListRoute /> : null,
-    errorElement: <ErrorPanel title="Agent Evaluations" />,
-  },
   {
     path: ROUTES.workspace.agentEvaluationDetail,
     element: AgentEvaluationDetailRoute ? <AgentEvaluationDetailRoute /> : null,
@@ -83,13 +67,6 @@ export const agentRoutes: RouteObject[] = agentsRoutes([
 export const getAgentSideNavItems = (workspace: string) =>
   AGENTS_ENABLED
     ? [
-        {
-          id: 'agent-evaluations',
-          slotIcon: <Form className={iconColorClass} />,
-          // Qualified: the rail hoists this out of Agents, next to the model evaluations link.
-          slotLabel: 'Agent Evaluations',
-          href: getAgentEvaluationsListRoute(workspace),
-        },
         ...(MONITOR_ENABLED
           ? [
               {

web/packages/studio/src/routes/utils.ts

@@ -633,10 +633,6 @@ export const getAgentMonitorRoute = (workspace: string) => {
   return generatePath(ROUTES.workspace.agentMonitor, { workspace });
 };
 
-export const getAgentEvaluationsListRoute = (workspace: string) => {
-  return generatePath(ROUTES.workspace.agentEvaluationsList, { workspace });
-};
-
 export const getAgentEvaluationDetailRoute = (workspace: string, agentEvalJobName: string) => {
   return generatePath(ROUTES.workspace.agentEvaluationDetail, {
     workspace,