diff --git a/src/renderer/src/components/sidebar/host-section-rows.ts b/src/renderer/src/components/sidebar/host-section-rows.ts
index e53789f7d4d..149a582072b 100644
--- a/src/renderer/src/components/sidebar/host-section-rows.ts
+++ b/src/renderer/src/components/sidebar/host-section-rows.ts
@@ -13,6 +13,7 @@ import type { RuntimeCompatVerdict } from '../../../../shared/protocol-compat'
 import type { SshConnectionStatus } from '../../../../shared/ssh-types'
 import type { FolderWorkspace, ProjectGroup, Repo } from '../../../../shared/types'
 import type { Row } from './worktree-list-groups'
+import { getFolderWorkspaceExecutionHostIdForRows } from './worktree-list-host-filtering'
 
 export type HostHeaderRow = {
   type: 'host-header'
@@ -54,17 +55,16 @@ function getRepoHostId(
   return defaultHostId
 }
 
-function getSshHostId(connectionId: string): ExecutionHostId {
-  return `ssh:${encodeURIComponent(connectionId)}` as ExecutionHostId
-}
-
 function getFolderWorkspaceHostId(
-  folderWorkspace: Pick<FolderWorkspace, 'connectionId'>,
-  projectGroup: Pick<ProjectGroup, 'connectionId'>,
+  folderWorkspace: Pick<FolderWorkspace, 'connectionId' | 'executionHostId'>,
+  projectGroup: Pick<ProjectGroup, 'connectionId' | 'executionHostId'>,
   defaultHostId: ExecutionHostId
 ): ExecutionHostId {
-  const connectionId = folderWorkspace.connectionId ?? projectGroup.connectionId
-  return connectionId ? getSshHostId(connectionId) : defaultHostId
+  return getFolderWorkspaceExecutionHostIdForRows({
+    folderWorkspace,
+    projectGroup,
+    defaultHostId
+  })
 }
 
 function getRowHostId(row: Row, defaultHostId: ExecutionHostId): ExecutionHostId | null {
diff --git a/src/renderer/src/components/sidebar/host-section-runtime-folder-rows.test.ts b/src/renderer/src/components/sidebar/host-section-runtime-folder-rows.test.ts
new file mode 100644
index 00000000000..9793e4119bd
--- /dev/null
+++ b/src/renderer/src/components/sidebar/host-section-runtime-folder-rows.test.ts
@@ -0,0 +1,124 @@
+import { describe, expect, it } from 'vitest'
+import type { FolderWorkspace, ProjectGroup } from '../../../../shared/types'
+import { addHostSectionRows, type HostSectionRow } from './host-section-rows'
+import type { Row } from './worktree-list-groups'
+
+function rowKey(row: HostSectionRow): string {
+  return row.type === 'item' ? row.rowKey : row.key
+}
+
+describe('runtime folder host section rows', () => {
+  it('groups a runtime folder row under its stamped owner', () => {
+    const projectGroup: ProjectGroup = {
+      id: 'group-1',
+      name: 'Runtime folder',
+      parentPath: '/srv/project',
+      connectionId: null,
+      executionHostId: 'runtime:env-1',
+      parentGroupId: null,
+      createdFrom: 'manual',
+      tabOrder: 0,
+      isCollapsed: false,
+      color: null,
+      createdAt: 1,
+      updatedAt: 1
+    }
+    const folderWorkspace: FolderWorkspace = {
+      id: 'folder-1',
+      projectGroupId: projectGroup.id,
+      name: 'Folder workspace',
+      folderPath: '/srv/project',
+      connectionId: null,
+      executionHostId: 'runtime:env-1',
+      linkedTask: null,
+      comment: '',
+      isArchived: false,
+      isUnread: false,
+      isPinned: false,
+      sortOrder: 0,
+      lastActivityAt: 1,
+      createdAt: 1,
+      updatedAt: 1
+    }
+    const localProjectGroup: ProjectGroup = {
+      ...projectGroup,
+      id: 'local-group',
+      name: 'Local folder',
+      executionHostId: 'local'
+    }
+    const localFolderWorkspace: FolderWorkspace = {
+      ...folderWorkspace,
+      id: 'local-folder',
+      projectGroupId: localProjectGroup.id,
+      name: 'Local workspace',
+      executionHostId: 'local'
+    }
+    const rows: Row[] = [
+      {
+        type: 'header',
+        key: 'project-group:local',
+        label: 'Local folder',
+        count: 1,
+        tone: 'text-foreground',
+        hostWorktreeCounts: new Map([['local', 1]]),
+        folderWorkspaceIds: [localFolderWorkspace.id]
+      },
+      {
+        type: 'folder-workspace',
+        key: 'folder-workspace:local-folder',
+        folderWorkspace: localFolderWorkspace,
+        projectGroup: localProjectGroup,
+        depth: 0,
+        groupDepth: 1
+      },
+      {
+        type: 'header',
+        key: 'project-group:runtime',
+        label: 'Runtime folder',
+        count: 1,
+        tone: 'text-foreground',
+        hostWorktreeCounts: new Map([['runtime:env-1', 1]]),
+        folderWorkspaceIds: [folderWorkspace.id]
+      },
+      {
+        type: 'folder-workspace',
+        key: 'folder-workspace:folder-1',
+        folderWorkspace,
+        projectGroup,
+        depth: 0,
+        groupDepth: 1
+      }
+    ]
+
+    const sectioned = addHostSectionRows({
+      rows,
+      hostOptions: [
+        {
+          id: 'local',
+          kind: 'local',
+          label: 'Local Mac',
+          detail: 'This computer',
+          health: 'local'
+        },
+        {
+          id: 'runtime:env-1',
+          kind: 'runtime',
+          label: 'Runtime',
+          detail: 'Orca server',
+          health: 'available'
+        }
+      ],
+      workspaceHostScope: 'all',
+      defaultHostId: 'local'
+    })
+
+    expect(sectioned.map(rowKey)).toEqual([
+      'host:local',
+      'project-group:local',
+      'folder-workspace:local-folder',
+      'host:runtime:env-1',
+      'project-group:runtime',
+      'folder-workspace:folder-1'
+    ])
+  })
+})
diff --git a/src/renderer/src/components/sidebar/project-group-sidebar-identity.test.ts b/src/renderer/src/components/sidebar/project-group-sidebar-identity.test.ts
index bb9e5d5e276..d2a11b61ca1 100644
--- a/src/renderer/src/components/sidebar/project-group-sidebar-identity.test.ts
+++ b/src/renderer/src/components/sidebar/project-group-sidebar-identity.test.ts
@@ -1,8 +1,10 @@
 import { describe, expect, it } from 'vitest'
-import type { ProjectGroup } from '../../../../shared/types'
+import { getFolderWorkspaceRowKey } from '../../../../shared/folder-workspaces'
+import type { FolderWorkspace, ProjectGroup } from '../../../../shared/types'
 import {
   buildProjectGroupSidebarIndex,
   findProjectGroupForSidebarOwner,
+  getAmbiguousFolderWorkspaceSidebarIds,
   getProjectGroupSidebarIdentity,
   hasSingleProjectGroupMutationOwner
 } from './project-group-sidebar-identity'
@@ -24,6 +26,30 @@ function group(id: string, executionHostId: string): ProjectGroup {
 }
 
 describe('project-group sidebar identity', () => {
+  it('keeps bare folder row keys until owner qualification is required', () => {
+    const workspace: FolderWorkspace = {
+      id: 'same-id',
+      projectGroupId: 'group-1',
+      name: 'Runtime folder',
+      folderPath: '/workspace',
+      executionHostId: 'runtime:env-1',
+      linkedTask: null,
+      comment: '',
+      isArchived: false,
+      isUnread: false,
+      isPinned: false,
+      sortOrder: 0,
+      lastActivityAt: 0,
+      createdAt: 1,
+      updatedAt: 1
+    }
+
+    expect(getFolderWorkspaceRowKey(workspace)).toBe('folder-workspace:same-id')
+    expect(getFolderWorkspaceRowKey(workspace, [], true)).toBe(
+      'folder-workspace:runtime%3Aenv-1:same-id'
+    )
+  })
+
   it('resolves duplicate ids only with their catalog owner', () => {
     const local = group('same-id', 'local')
     const runtime = group('same-id', 'runtime:env-1')
@@ -35,6 +61,20 @@ describe('project-group sidebar identity', () => {
     expect(getProjectGroupSidebarIdentity(local)).not.toBe(getProjectGroupSidebarIdentity(runtime))
   })
 
+  it('marks folder row ids ambiguous only across owners', () => {
+    const local = group('local-group', 'local')
+    const runtime = group('runtime-group', 'runtime:env-1')
+    const index = buildProjectGroupSidebarIndex([local, runtime])
+
+    expect(
+      getAmbiguousFolderWorkspaceSidebarIds(index, [
+        { id: 'same-id', projectGroupId: local.id, executionHostId: 'local' },
+        { id: 'same-id', projectGroupId: runtime.id, executionHostId: 'runtime:env-1' },
+        { id: 'unique-id', projectGroupId: runtime.id, executionHostId: 'runtime:env-1' }
+      ])
+    ).toEqual(new Set(['same-id']))
+  })
+
   it('does not fall back to a foreign group for an explicit stale owner', () => {
     const local = group('same-id', 'local')
     const index = buildProjectGroupSidebarIndex([local])
diff --git a/src/renderer/src/components/sidebar/project-group-sidebar-identity.ts b/src/renderer/src/components/sidebar/project-group-sidebar-identity.ts
index 938ed9a0625..f01f4c0a5cc 100644
--- a/src/renderer/src/components/sidebar/project-group-sidebar-identity.ts
+++ b/src/renderer/src/components/sidebar/project-group-sidebar-identity.ts
@@ -137,6 +137,32 @@ export function findProjectGroupForFolderWorkspace(
   return findProjectGroupForSidebarOwner(index, workspace.projectGroupId, ownerHostId)
 }
 
+export function getAmbiguousFolderWorkspaceSidebarIds(
+  index: ProjectGroupSidebarIndex,
+  workspaces: readonly Pick<
+    FolderWorkspace,
+    'id' | 'connectionId' | 'executionHostId' | 'projectGroupId'
+  >[]
+): ReadonlySet<string> {
+  const ownerById = new Map<string, ExecutionHostId>()
+  const ambiguousIds = new Set<string>()
+  for (const workspace of workspaces) {
+    const group = findProjectGroupForFolderWorkspace(index, workspace)
+    if (!group || ambiguousIds.has(workspace.id)) {
+      continue
+    }
+    const ownerHostId = getProjectGroupOwnerHostId(group)
+    const existingOwnerHostId = ownerById.get(workspace.id)
+    if (existingOwnerHostId && existingOwnerHostId !== ownerHostId) {
+      ownerById.delete(workspace.id)
+      ambiguousIds.add(workspace.id)
+    } else {
+      ownerById.set(workspace.id, ownerHostId)
+    }
+  }
+  return ambiguousIds
+}
+
 export function findProjectGroupParentForSidebar(
   index: ProjectGroupSidebarIndex,
   group: ProjectGroup
diff --git a/src/renderer/src/components/sidebar/worktree-list-groups.ts b/src/renderer/src/components/sidebar/worktree-list-groups.ts
index 26fe90abdeb..7ea040cbcae 100644
--- a/src/renderer/src/components/sidebar/worktree-list-groups.ts
+++ b/src/renderer/src/components/sidebar/worktree-list-groups.ts
@@ -61,6 +61,7 @@ import {
   findProjectGroupForFolderWorkspace,
   findProjectGroupForRepo,
   findProjectGroupParentForSidebar,
+  getAmbiguousFolderWorkspaceSidebarIds,
   getProjectGroupOwnerHostId,
   getProjectGroupSidebarIdentity
 } from './project-group-sidebar-identity'
@@ -1407,6 +1408,10 @@ export function buildRows(
   }
 
   const projectGroupIndex = buildProjectGroupSidebarIndex(projectGroups)
+  const ambiguousFolderWorkspaceIds = getAmbiguousFolderWorkspaceSidebarIds(
+    projectGroupIndex,
+    folderWorkspaces
+  )
   const groupByProjectGroupIdentity = new Map<string | null, OrderedGroupEntry[]>()
   for (const entry of orderedGroups) {
     const repo = entry[1].repo
@@ -1585,7 +1590,11 @@ export function buildRows(
       for (const folderWorkspace of folderWorkspacesByProjectGroupIdentity.get(identity) ?? []) {
         result.push({
           type: 'folder-workspace',
-          key: getFolderWorkspaceRowKey(folderWorkspace, [projectGroup]),
+          key: getFolderWorkspaceRowKey(
+            folderWorkspace,
+            [projectGroup],
+            ambiguousFolderWorkspaceIds.has(folderWorkspace.id)
+          ),
           folderWorkspace,
           projectGroup,
           depth: 0,
diff --git a/src/shared/folder-workspaces.ts b/src/shared/folder-workspaces.ts
index 8c595f0a4cf..15d69eb3ba7 100644
--- a/src/shared/folder-workspaces.ts
+++ b/src/shared/folder-workspaces.ts
@@ -68,8 +68,12 @@ export function getFolderWorkspaceIdentity(
 
 export function getFolderWorkspaceRowKey(
   workspace: Pick<FolderWorkspace, 'id' | 'connectionId' | 'executionHostId' | 'projectGroupId'>,
-  projectGroups: readonly ProjectGroup[] = []
+  projectGroups: readonly ProjectGroup[] = [],
+  qualifyOwner = false
 ): string {
+  if (!qualifyOwner) {
+    return `folder-workspace:${workspace.id}`
+  }
   const ownerHostId = getFolderWorkspaceCatalogOwnerHostId(workspace, projectGroups)
   return `folder-workspace:${encodeURIComponent(ownerHostId)}:${encodeURIComponent(workspace.id)}`
 }