diff --git a/src/renderer/src/components/automations/AutomationListLocalRow.tsx b/src/renderer/src/components/automations/AutomationListLocalRow.tsx
index a9c1a5bc8b6..6e53f66302d 100644
--- a/src/renderer/src/components/automations/AutomationListLocalRow.tsx
+++ b/src/renderer/src/components/automations/AutomationListLocalRow.tsx
@@ -30,7 +30,7 @@ import type { SshConnectionState } from '../../../../shared/ssh-types'
 import type { ProjectHostSetup } from '../../../../shared/project-types'
 import type { Repo } from '../../../../shared/repo-types'
 import type { Worktree } from '../../../../shared/worktree/types'
-import type { RuntimeStatus } from '../../../../shared/runtime-types'
+import type { RuntimeEnvironmentStatus } from '../../../../shared/runtime-host-status'
 import type { TaskSourceHostAvailability } from '../task-source-context-summary'
 import type { AutomationRowAction } from './automation-captured-owner'
 import type { AutomationHostTarget } from './automation-host-client'
@@ -70,10 +70,7 @@ export type AutomationListLocalRowProps = {
   worktreeForRow?: (row: AutomationListRow, repo: Repo | undefined) => Worktree | undefined
   projectHostSetups: readonly ProjectHostSetup[]
   sshConnectionStates: ReadonlyMap<string, Pick<SshConnectionState, 'status'>>
-  runtimeStatusByEnvironmentId: ReadonlyMap<
-    string,
-    { status: RuntimeStatus | null; checkedAt: number }
-  >
+  runtimeStatusByEnvironmentId: ReadonlyMap<string, RuntimeEnvironmentStatus>
   hostTargetFor: (row: AutomationListRow) => AutomationHostTarget | null
   automationSourceHostAvailabilityByRowKey: ReadonlyMap<string, TaskSourceHostAvailability[]>
   hostLabelById?: ReadonlyMap<string, string>
diff --git a/src/renderer/src/components/automations/AutomationsListPanel.tsx b/src/renderer/src/components/automations/AutomationsListPanel.tsx
index 783eee57da6..3460aafeb2a 100644
--- a/src/renderer/src/components/automations/AutomationsListPanel.tsx
+++ b/src/renderer/src/components/automations/AutomationsListPanel.tsx
@@ -11,7 +11,7 @@ import type { SshConnectionState } from '../../../../shared/ssh-types'
 import type { ProjectHostSetup } from '../../../../shared/project-types'
 import type { Repo } from '../../../../shared/repo-types'
 import type { Worktree } from '../../../../shared/worktree/types'
-import type { RuntimeStatus } from '../../../../shared/runtime-types'
+import type { RuntimeEnvironmentStatus } from '../../../../shared/runtime-host-status'
 import type { TaskSourceHostAvailability } from '../task-source-context-summary'
 import type { AutomationRowAction } from './automation-captured-owner'
 import type { AutomationHostTarget } from './automation-host-client'
@@ -53,7 +53,7 @@ import { AutomationListToolbar } from './AutomationListToolbar'
 const TEMPLATE_EMPTY_STATES: ReadonlySet<string> = new Set(['host-empty', 'all-hosts-empty'])
 const EMPTY_AUTOMATION_RUNS: ReadonlyMap<string, AutomationRun> = new Map()
 
-type AutomationsListPanelProps = {
+export type AutomationsListPanelProps = {
   hasListItems: boolean
   hasFilteredListItems: boolean
   listSearchQuery: string
@@ -83,10 +83,7 @@ type AutomationsListPanelProps = {
   worktreeForRow?: (row: AutomationListRow, repo: Repo | undefined) => Worktree | undefined
   projectHostSetups: readonly ProjectHostSetup[]
   sshConnectionStates: ReadonlyMap<string, Pick<SshConnectionState, 'status'>>
-  runtimeStatusByEnvironmentId: ReadonlyMap<
-    string,
-    { status: RuntimeStatus | null; checkedAt: number }
-  >
+  runtimeStatusByEnvironmentId: ReadonlyMap<string, RuntimeEnvironmentStatus>
   hostTargetFor: (row: AutomationListRow) => AutomationHostTarget | null
   automationSourceHostAvailabilityByRowKey: ReadonlyMap<string, TaskSourceHostAvailability[]>
   hostLabelById?: ReadonlyMap<string, string>
diff --git a/src/renderer/src/components/automations/automation-source-context.ts b/src/renderer/src/components/automations/automation-source-context.ts
index e8a05ebabc5..c57a3bc4f20 100644
--- a/src/renderer/src/components/automations/automation-source-context.ts
+++ b/src/renderer/src/components/automations/automation-source-context.ts
@@ -1,7 +1,7 @@
 import { TASK_SOURCE_CONTEXT_RUNTIME_CAPABILITY } from '../../../../shared/protocol-version'
 import { parseExecutionHostId } from '../../../../shared/execution-host'
 import type { Automation } from '../../../../shared/automations-types'
-import type { RuntimeStatus } from '../../../../shared/runtime-types'
+import type { RuntimeEnvironmentStatus } from '../../../../shared/runtime-host-status'
 import type { TaskSourceContext } from '../../../../shared/task-source-context'
 import type { TaskSourceHostAvailability } from '../task-source-context-summary'
 
@@ -20,10 +20,7 @@ export function getRepoBackedAutomationSourceContext(
 
 export function getRuntimeSourceHostAvailability(
   context: TaskSourceContext,
-  runtimeStatusByEnvironmentId: ReadonlyMap<
-    string,
-    { status: RuntimeStatus | null; checkedAt: number }
-  >
+  runtimeStatusByEnvironmentId: ReadonlyMap<string, RuntimeEnvironmentStatus>
 ): TaskSourceHostAvailability | null {
   const parsed = parseExecutionHostId(context.hostId)
   if (parsed?.kind !== 'runtime') {
diff --git a/src/renderer/src/components/automations/automation-target-availability.ts b/src/renderer/src/components/automations/automation-target-availability.ts
index 7fe53db94a0..a745b3d87b8 100644
--- a/src/renderer/src/components/automations/automation-target-availability.ts
+++ b/src/renderer/src/components/automations/automation-target-availability.ts
@@ -11,9 +11,9 @@ import {
 import type { AutomationHostTarget } from './automation-host-client'
 import type { SshConnectionState } from '../../../../shared/ssh-types'
 import type { TaskSourceContext } from '../../../../shared/task-source-context'
-import type { RuntimeStatus } from '../../../../shared/runtime-types'
 import type { ProjectHostSetup } from '../../../../shared/project-types'
 import type { Repo } from '../../../../shared/repo-types'
+import type { RuntimeEnvironmentStatus } from '../../../../shared/runtime-host-status'
 import type { Worktree } from '../../../../shared/worktree/types'
 import type { TaskSourceHostAvailability } from '../task-source-context-summary'
 
@@ -51,10 +51,7 @@ type AutomationTargetAvailabilityArgs = {
   workspace: Worktree | null | undefined
   projectHostSetups: readonly ProjectHostSetup[]
   sshConnectionStates: ReadonlyMap<string, Pick<SshConnectionState, 'status'>>
-  runtimeStatusByEnvironmentId?: ReadonlyMap<
-    string,
-    { status: RuntimeStatus | null; checkedAt: number }
-  >
+  runtimeStatusByEnvironmentId?: ReadonlyMap<string, RuntimeEnvironmentStatus>
   automationHostTarget?: AutomationHostTarget | null
   sourceHostAvailability?: readonly TaskSourceHostAvailability[]
 }
@@ -267,9 +264,7 @@ function getAutomationSourceProviderLabel(provider: TaskSourceContext['provider'
 
 export function getRuntimeAutomationAvailability(
   environmentId: string,
-  runtimeStatusByEnvironmentId:
-    | ReadonlyMap<string, { status: RuntimeStatus | null; checkedAt: number }>
-    | undefined
+  runtimeStatusByEnvironmentId: ReadonlyMap<string, RuntimeEnvironmentStatus> | undefined
 ): AutomationTargetAvailability {
   const entry = runtimeStatusByEnvironmentId?.get(environmentId)
   if (!entry) {
diff --git a/src/renderer/src/components/cmd-j/palette-host-badge.test.ts b/src/renderer/src/components/cmd-j/palette-host-badge.test.ts
index 8d15ff8d034..586c3d54641 100644
--- a/src/renderer/src/components/cmd-j/palette-host-badge.test.ts
+++ b/src/renderer/src/components/cmd-j/palette-host-badge.test.ts
@@ -88,6 +88,7 @@ describe('getPaletteHostBadge', () => {
         [
           'env-1',
           {
+            checkedAt: 0,
             status: {
               runtimeId: 'rt',
               rendererGraphEpoch: 0,
diff --git a/src/renderer/src/components/sidebar/sidebar-host-options.test.ts b/src/renderer/src/components/sidebar/sidebar-host-options.test.ts
index 6fe8d0d5901..f527857bb0f 100644
--- a/src/renderer/src/components/sidebar/sidebar-host-options.test.ts
+++ b/src/renderer/src/components/sidebar/sidebar-host-options.test.ts
@@ -115,6 +115,7 @@ describe('sidebar host options', () => {
         [
           'runtime-1',
           {
+            checkedAt: 0,
             status: {
               runtimeId: 'rt',
               rendererGraphEpoch: 0,
@@ -147,6 +148,7 @@ describe('sidebar host options', () => {
         [
           'runtime-1',
           {
+            checkedAt: 0,
             status: {
               runtimeId: 'rt',
               rendererGraphEpoch: 0,
diff --git a/src/renderer/src/components/sidebar/sidebar-host-options.ts b/src/renderer/src/components/sidebar/sidebar-host-options.ts
index 29d03ec1419..fb6ba2808ab 100644
--- a/src/renderer/src/components/sidebar/sidebar-host-options.ts
+++ b/src/renderer/src/components/sidebar/sidebar-host-options.ts
@@ -12,8 +12,8 @@ import {
 } from '../../../../shared/execution-host-registry'
 import type { RuntimeCompatVerdict } from '../../../../shared/protocol-compat'
 import type { SshConnectionState, SshConnectionStatus } from '../../../../shared/ssh-types'
-import type { RuntimeStatus } from '../../../../shared/runtime-types'
 import type { PublicKnownRuntimeEnvironment } from '../../../../shared/runtime-environments'
+import type { RuntimeEnvironmentStatus } from '../../../../shared/runtime-host-status'
 import { translate } from '@/i18n/i18n'
 
 export type SidebarHostOption = {
@@ -43,10 +43,7 @@ export function buildSidebarHostOptions(args: {
   settings: Pick<GlobalSettings, 'activeRuntimeEnvironmentId'> | null | undefined
   // Why: live per-environment runtime status lets the registry surface compat
   // verdicts and blocked health in the sidebar without re-probing servers.
-  runtimeStatusByEnvironmentId?: ReadonlyMap<
-    string,
-    { status?: RuntimeStatus | null; appVersion?: string | null }
-  >
+  runtimeStatusByEnvironmentId?: ReadonlyMap<string, RuntimeEnvironmentStatus>
   runtimeEnvironments?: readonly Pick<PublicKnownRuntimeEnvironment, 'id' | 'name'>[]
   // Why: per-host display-label overrides rename hosts everywhere the sidebar
   // options feed (host headers, scope picker, focus menu).
diff --git a/src/renderer/src/store/slices/runtime-host-status-entry-parity.test.ts b/src/renderer/src/store/slices/runtime-host-status-entry-parity.test.ts
new file mode 100644
index 00000000000..63c3de2e708
--- /dev/null
+++ b/src/renderer/src/store/slices/runtime-host-status-entry-parity.test.ts
@@ -0,0 +1,56 @@
+// The store's host-status entry is one shape, and every reader of the map has to accept exactly
+// it. A narrower local copy still typechecks against the store — the fields it is missing are all
+// optional — so it freezes at the vintage it was written at and never fails. #17710 added
+// `remoteControl` and #20003 added `snapshot`; the copies these assertions cover were not updated
+// either time. Like the other typed-contract tests, they fail at typecheck, not at runtime.
+import { describe, expectTypeOf, it } from 'vitest'
+import type { buildExecutionHostRegistry } from '../../../../shared/execution-host-registry'
+import type { buildSidebarHostOptions } from '@/components/sidebar/sidebar-host-options'
+import type { getRuntimeAutomationAvailability } from '@/components/automations/automation-target-availability'
+import type { getRuntimeSourceHostAvailability } from '@/components/automations/automation-source-context'
+import type { AutomationListLocalRowProps } from '@/components/automations/AutomationListLocalRow'
+import type { AutomationsListPanelProps } from '@/components/automations/AutomationsListPanel'
+import type { RuntimeEnvironmentStatus } from './runtime-status-types'
+
+// Compare the entry each reader accepts rather than the surrounding map, so a mismatch names the
+// field that drifted instead of every ReadonlyMap method signature.
+type AcceptedEntry<T> = NonNullable<T> extends ReadonlyMap<string, infer TEntry> ? TEntry : never
+
+type RegistryEntry = AcceptedEntry<
+  Parameters<typeof buildExecutionHostRegistry>[0]['runtimeStatusByEnvironmentId']
+>
+type SidebarEntry = AcceptedEntry<
+  Parameters<typeof buildSidebarHostOptions>[0]['runtimeStatusByEnvironmentId']
+>
+type AutomationEntry = AcceptedEntry<Parameters<typeof getRuntimeAutomationAvailability>[1]>
+type SourceContextEntry = AcceptedEntry<Parameters<typeof getRuntimeSourceHostAvailability>[1]>
+type LocalRowEntry = AcceptedEntry<AutomationListLocalRowProps['runtimeStatusByEnvironmentId']>
+type ListPanelEntry = AcceptedEntry<AutomationsListPanelProps['runtimeStatusByEnvironmentId']>
+
+describe('every reader of the runtime host status map accepts the store entry', () => {
+  it('holds for the execution-host registry', () => {
+    expectTypeOf<RegistryEntry>().toEqualTypeOf<RuntimeEnvironmentStatus>()
+  })
+
+  it('holds for the sidebar host options', () => {
+    expectTypeOf<SidebarEntry>().toEqualTypeOf<RuntimeEnvironmentStatus>()
+  })
+
+  it('holds for runtime automation availability', () => {
+    expectTypeOf<AutomationEntry>().toEqualTypeOf<RuntimeEnvironmentStatus>()
+  })
+
+  // These three only forward the map, which is exactly how a stale copy survives: nothing they
+  // do with it can fail, so the drift surfaces in whatever they hand it to.
+  it('holds for the automation source-context reader', () => {
+    expectTypeOf<SourceContextEntry>().toEqualTypeOf<RuntimeEnvironmentStatus>()
+  })
+
+  it('holds for the automation list row', () => {
+    expectTypeOf<LocalRowEntry>().toEqualTypeOf<RuntimeEnvironmentStatus>()
+  })
+
+  it('holds for the automations list panel', () => {
+    expectTypeOf<ListPanelEntry>().toEqualTypeOf<RuntimeEnvironmentStatus>()
+  })
+})
diff --git a/src/renderer/src/store/slices/runtime-status-types.ts b/src/renderer/src/store/slices/runtime-status-types.ts
index 78e47123cf5..b9ea9411d93 100644
--- a/src/renderer/src/store/slices/runtime-status-types.ts
+++ b/src/renderer/src/store/slices/runtime-status-types.ts
@@ -1,15 +1,10 @@
-import type { RuntimeHostStatusSnapshot } from '../../../../shared/runtime-host-status'
+import type {
+  RuntimeEnvironmentStatus,
+  RuntimeHostStatusSnapshot
+} from '../../../../shared/runtime-host-status'
 import type { PublicKnownRuntimeEnvironment } from '../../../../shared/runtime-environments'
-import type { RuntimeStatus } from '../../../../shared/runtime-types'
 
-export type RuntimeEnvironmentStatus = {
-  snapshot?: RuntimeHostStatusSnapshot
-  status: RuntimeStatus | null
-  remoteControl?: RuntimeStatus['remoteControl'] | null
-  appVersion?: string | null
-  checkedAt: number
-  connectionGeneration?: number
-}
+export type { RuntimeEnvironmentStatus }
 
 export type RuntimeStatusSlice = {
   readRuntimeHostStatusSnapshots: () => Promise<void>
diff --git a/src/shared/execution-host-registry.test.ts b/src/shared/execution-host-registry.test.ts
index e397e8ed5bf..9aefe7cfe7e 100644
--- a/src/shared/execution-host-registry.test.ts
+++ b/src/shared/execution-host-registry.test.ts
@@ -121,6 +121,7 @@ describe('execution host registry', () => {
         [
           'builder',
           {
+            checkedAt: 0,
             appVersion: '1.8.0',
             status: {
               runtimeId: 'runtime-builder',
@@ -139,6 +140,7 @@ describe('execution host registry', () => {
         [
           'old-server',
           {
+            checkedAt: 0,
             appVersion: '1.6.0',
             status: {
               runtimeId: 'runtime-old',
@@ -187,6 +189,7 @@ describe('execution host registry', () => {
         [
           'dev-box',
           {
+            checkedAt: 0,
             status: {
               runtimeId: 'runtime-dev',
               rendererGraphEpoch: 1,
@@ -229,6 +232,7 @@ describe('execution host registry', () => {
         [
           'dev-box',
           {
+            checkedAt: 0,
             status: null,
             remoteControl: {
               state: 'ready',
@@ -264,6 +268,7 @@ describe('execution host registry', () => {
         [
           'vm-runtime',
           {
+            checkedAt: 0,
             status: {
               runtimeId: 'runtime-vm',
               rendererGraphEpoch: 1,
@@ -340,6 +345,7 @@ describe('execution host registry', () => {
         [
           'gpu',
           {
+            checkedAt: 0,
             appVersion: '1.8.0',
             status: {
               runtimeId: 'runtime-gpu',
@@ -381,6 +387,7 @@ it('keeps an initial unknown-transport verification connecting', () => {
       [
         'host',
         {
+          checkedAt: 0,
           status: null,
           snapshot: {
             environmentId: 'host',
diff --git a/src/shared/execution-host-registry.ts b/src/shared/execution-host-registry.ts
index bad6b40f257..5602e115f9f 100644
--- a/src/shared/execution-host-registry.ts
+++ b/src/shared/execution-host-registry.ts
@@ -1,4 +1,4 @@
-import type { RuntimeHostStatusSnapshot } from './runtime-host-status'
+import type { RuntimeEnvironmentStatus } from './runtime-host-status'
 import {
   LOCAL_EXECUTION_HOST_ID,
   getLocalExecutionHostLabel,
@@ -49,14 +49,7 @@ type RuntimeEnvironmentSummary = {
   source?: RuntimeEnvironmentSource
 }
 
-type RuntimeHostStatus = {
-  snapshot?: RuntimeHostStatusSnapshot
-  status?: RuntimeStatus | null
-  remoteControl?: RuntimeStatus['remoteControl'] | null
-  appVersion?: string | null
-}
-
-type RuntimeStatusByEnvironmentId = ReadonlyMap<string, RuntimeHostStatus>
+type RuntimeStatusByEnvironmentId = ReadonlyMap<string, RuntimeEnvironmentStatus>
 
 export type ExecutionHostSource = 'configured-only' | 'include-references'
 
diff --git a/src/shared/runtime-host-status.ts b/src/shared/runtime-host-status.ts
index 4dd7ff7cc22..750f260e796 100644
--- a/src/shared/runtime-host-status.ts
+++ b/src/shared/runtime-host-status.ts
@@ -17,6 +17,21 @@ export type RuntimeHostStatusSnapshot = {
   retired?: true
 }
 
+/**
+ * One client-side record of a host's last status probe: the projected `status`, and the
+ * `snapshot` evidence for what that projection is worth. Declared once rather than duck-typed
+ * per consumer — every field added here has been optional, so a local structural copy keeps
+ * typechecking against the store while silently missing whatever landed after it was written.
+ */
+export type RuntimeEnvironmentStatus = {
+  snapshot?: RuntimeHostStatusSnapshot
+  status: RuntimeStatus | null
+  remoteControl?: RuntimeStatus['remoteControl'] | null
+  appVersion?: string | null
+  checkedAt: number
+  connectionGeneration?: number
+}
+
 export type RuntimeHostStatusResponse = RuntimeRpcResponse<RuntimeStatus>
 
 export function runtimeHostStatusFailure(code: string, message: string): RuntimeRpcFailure {