fix: preserve legacy federated session actions

.changeset/legacy-federated-session-actions.md

@@ -0,0 +1,5 @@
+---
+"@jmfederico/pi-web": patch
+---
+
+Preserve archive and archived-session delete actions for older federated PI WEB machines that do not yet advertise session persistence or delete capabilities.

src/client/src/components/PiWebApp.ts

@@ -20,6 +20,7 @@ import { SessionStorageWorkspaceSelectionMemory } from "../controllers/workspace
 import { KeyboardShortcutDispatcher } from "../keyboardShortcuts";
 import { selectedMachineId } from "../controllers/types";
 import { sessionCleanupRequestKey, sessionCleanupUnavailableMessage } from "../sessionCleanupUi";
+import { hasAuthoritativeSessionPersistence as runtimeHasAuthoritativeSessionPersistence } from "../sessionPersistence";
 import { RealtimeSocket } from "../sessionSocket";
 import type { PiWebPluginRegistration, PluginMachine, PluginPromptEditor, QualifiedContributionId, QualifiedThemeContribution, QualifiedThemePairContribution, QualifiedWorkspacePanelContribution, PluginRuntimeContext, TerminalCommandRunsInternalRuntime, WorkspaceFiles, WorkspaceHost, WorkspaceLabelContext, WorkspaceLabelItem, WorkspacePanelContext } from "../plugins/types";
 import { CLASSIC_THEME_ID, DEFAULT_THEME_PREFERENCE, applyPiWebTheme, findThemePairForTheme, readStoredThemePreference, resolveThemePreference, writeStoredThemePreference, type ThemePreference, type ThemePreferenceResolution } from "../theme";
@@ -1016,7 +1017,10 @@ export class PiWebApp extends LitElement {
 
   private canDeleteArchivedSessions(): boolean {
     const runtime = this.selectedMachineRuntime();
-    return runtime?.ok === true && supportsPiWebCapability(runtime, PI_WEB_CAPABILITIES.sessionsDeleteArchived);
+    // COMPAT-CAP sessions.deleteArchived: older federated machines may support
+    // the legacy DELETE route without advertising runtime capabilities. Only
+    // block when capability discovery succeeds and reports no support.
+    return runtime?.ok !== true || supportsPiWebCapability(runtime, PI_WEB_CAPABILITIES.sessionsDeleteArchived);
   }
 
   private canReloadSessions(): boolean {
@@ -1029,6 +1033,10 @@ export class PiWebApp extends LitElement {
     return runtime?.ok === true && supportsPiWebCapability(runtime, PI_WEB_CAPABILITIES.sessionsCleanup);
   }
 
+  private hasAuthoritativeSessionPersistence(): boolean {
+    return runtimeHasAuthoritativeSessionPersistence(this.selectedMachineRuntime());
+  }
+
   private supportsWorkspaceFileSuggestions(machineId = selectedMachineId(this.state)): boolean {
     if (machineId === "local") return true;
     // COMPAT-CAP workspace.fileSuggestions: remote machines without this
@@ -1124,6 +1132,7 @@ export class PiWebApp extends LitElement {
         .canDeleteArchivedSessions=${this.canDeleteArchivedSessions()}
         .canReloadSessions=${this.canReloadSessions()}
         .canCleanupSessions=${this.canCleanupSessions()}
+        .authoritativeSessionPersistence=${this.hasAuthoritativeSessionPersistence()}
         .archivedDeleteUnavailableMessage=${this.archivedDeleteUnavailableMessage()}
         .cleanupUnavailableMessage=${this.sessionCleanupUnavailableMessage()}
         .collapsible=${true}

src/client/src/components/SessionList.test.ts

@@ -27,11 +27,17 @@ describe("sessionRowActivityKind", () => {
 });
 
 describe("session action eligibility", () => {
-  it("requires a persisted server signal before archiving", () => {
+  it("requires a persisted server signal before archiving when persistence is authoritative", () => {
-    expect(isArchivableSessionInfo(session("persisted", { persisted: true }))).toBe(true);
+    const authoritative = { authoritative: true };
-    expect(isArchivableSessionInfo(session("unknown"))).toBe(false);
+    expect(isArchivableSessionInfo(session("persisted", { persisted: true }), undefined, authoritative)).toBe(true);
-    expect(isArchivableSessionInfo(session("transient", { persisted: false }))).toBe(false);
+    expect(isArchivableSessionInfo(session("unknown"), undefined, authoritative)).toBe(false);
-    expect(isArchivableSessionInfo({ ...session("archived", { persisted: true }), archived: true, archivedAt: "2026-06-09T00:00:00.000Z" })).toBe(false);
+    expect(isArchivableSessionInfo(session("transient", { persisted: false }), undefined, authoritative)).toBe(false);
+    expect(isArchivableSessionInfo({ ...session("archived", { persisted: true }), archived: true, archivedAt: "2026-06-09T00:00:00.000Z" }, undefined, authoritative)).toBe(false);
+  });
+
+  it("preserves legacy archiving when persistence support is not advertised", () => {
+    expect(isArchivableSessionInfo(session("legacy"))).toBe(true);
+    expect(isTransientNewSessionInfo(session("legacy"))).toBe(false);
   });
 
   it("allows deleting transient non-archived sessions from server or browser-cached signals", () => {

src/client/src/components/SessionList.ts

@@ -36,6 +36,7 @@ export class SessionList extends LitElement implements KeyboardNavigableSection
   @property({ type: Boolean }) canDeleteArchived = false;
   @property({ type: Boolean }) canReload = false;
   @property({ type: Boolean }) canCleanup = false;
+  @property({ type: Boolean }) authoritativeSessionPersistence = false;
   @property({ type: String }) archivedDeleteUnavailableMessage = "Update and restart Pi-Web on this machine to delete archived sessions.";
   @property({ type: String }) cleanupUnavailableMessage = "Update and restart Pi-Web on this machine to clean up sessions.";
   @property({ type: Boolean, reflect: true }) collapsible = false;
@@ -193,7 +194,7 @@ export class SessionList extends LitElement implements KeyboardNavigableSection
     if (visibleSessions.length === 0 || !this.selectionScopes.has("current")) return null;
 
     const selectedSessions = this.selectedSessions("current");
-    const archivableSessions = selectedSessions.filter((session) => isArchivableSessionInfo(session, this.statuses[session.id]));
+    const archivableSessions = selectedSessions.filter((session) => isArchivableSessionInfo(session, this.statuses[session.id], this.sessionPersistenceOptions()));
     const allVisibleSelected = visibleSessions.length > 0 && visibleSessions.every((session) => this.selectedSessionIds.has(session.id));
     const visibleSelectedCount = visibleSessions.filter((session) => this.selectedSessionIds.has(session.id)).length;
     return html`
@@ -234,8 +235,9 @@ export class SessionList extends LitElement implements KeyboardNavigableSection
     const bulkSelected = showsCheckbox && this.selectedSessionIds.has(session.id);
     const status = this.statuses[session.id];
     const activity = this.activities[session.id];
-    const canArchive = isArchivableSessionInfo(session, status);
+    const persistenceOptions = this.sessionPersistenceOptions();
-    const canDeleteTransient = isTransientNewSessionInfo(session, status);
+    const canArchive = isArchivableSessionInfo(session, status, persistenceOptions);
+    const canDeleteTransient = isTransientNewSessionInfo(session, status, persistenceOptions);
     const canReloadSession = canArchive && this.canReload;
     return html`
       <div
@@ -315,7 +317,7 @@ export class SessionList extends LitElement implements KeyboardNavigableSection
   }
 
   private archiveSelectedCurrent(): void {
-    const sessions = this.selectedSessions("current").filter((session) => isArchivableSessionInfo(session, this.statuses[session.id]));
+    const sessions = this.selectedSessions("current").filter((session) => isArchivableSessionInfo(session, this.statuses[session.id], this.sessionPersistenceOptions()));
     this.selectedSessionIds = removeSessionIds(this.selectedSessionIds, sessions.map((session) => session.id));
     void this.onArchiveMany?.(sessions);
   }
@@ -395,7 +397,7 @@ export class SessionList extends LitElement implements KeyboardNavigableSection
   }
 
   private renderSessionMetaPrefix(session: SessionInfo, status: SessionStatus | undefined, activity: SessionActivity | undefined) {
-    if (isTransientNewSessionInfo(session, status)) {
+    if (isTransientNewSessionInfo(session, status, this.sessionPersistenceOptions())) {
       if (activity?.phase === "active") return "creating · ";
       if (activity?.phase === "error") return "error · ";
       return "new · ";
@@ -404,6 +406,10 @@ export class SessionList extends LitElement implements KeyboardNavigableSection
     return "";
   }
 
+  private sessionPersistenceOptions() {
+    return { authoritative: this.authoritativeSessionPersistence };
+  }
+
   private renderActivity(session: SessionInfo) {
     const kind = sessionRowActivityKind(session, this.statuses[session.id], this.activities[session.id], this.sending[session.id] === true);
     return renderActionActivityIndicator(kind, kind === "sending" ? "Sending message" : "Session active");

src/client/src/components/appShell/AppNavigationPanel.ts

@@ -44,6 +44,7 @@ export class AppNavigationPanel extends LitElement {
   @property({ type: Boolean }) canDeleteArchivedSessions = false;
   @property({ type: Boolean }) canReloadSessions = false;
   @property({ type: Boolean }) canCleanupSessions = false;
+  @property({ type: Boolean }) authoritativeSessionPersistence = false;
   @property({ type: String }) archivedDeleteUnavailableMessage = "Update and restart Pi-Web on this machine to delete archived sessions.";
   @property({ type: String }) cleanupUnavailableMessage = "Update and restart Pi-Web on this machine to clean up sessions.";
   @property({ attribute: false }) onShowActions?: () => void;
@@ -165,6 +166,7 @@ export class AppNavigationPanel extends LitElement {
         .canDeleteArchived=${this.canDeleteArchivedSessions}
         .canReload=${this.canReloadSessions}
         .canCleanup=${this.canCleanupSessions}
+        .authoritativeSessionPersistence=${this.authoritativeSessionPersistence}
         .archivedDeleteUnavailableMessage=${this.archivedDeleteUnavailableMessage}
         .cleanupUnavailableMessage=${this.cleanupUnavailableMessage}
         .collapsible=${this.collapsible}

src/client/src/controllers/sessionController.test.ts

@@ -1124,6 +1124,31 @@ describe("SessionController", () => {
     expect(urlUpdates).toEqual([undefined]);
   });
 
+  it("archives legacy sessions when persistence support is not advertised", async () => {
+    const legacySession = { ...oldSession };
+    const archivedIds: string[] = [];
+    let state: AppState = { ...initialAppState(), selectedWorkspace: workspace, selectedSession: legacySession, sessions: [legacySession] };
+    const api: typeof defaultApi = {
+      ...defaultApi,
+      archive: (session) => {
+        archivedIds.push(sessionLookupId(session));
+        return Promise.resolve({ archived: true });
+      },
+    };
+    const controller = new SessionController(
+      () => state,
+      (patch) => { state = { ...state, ...patch }; },
+      () => undefined,
+      new InMemorySessionSelectionMemory(),
+      { api, socket: new FakeSocket() },
+    );
+
+    await controller.archiveSession(legacySession);
+
+    expect(archivedIds).toEqual([legacySession.id]);
+    expect(state.sessions[0]).toMatchObject({ id: legacySession.id, archived: true });
+  });
+
   it("archives selected session descendants and selects the next active session", async () => {
     const persistedSession = { ...oldSession, persisted: true };
     const childSession = { ...oldSession, id: "child-session", path: "/tmp/child-session.jsonl", parentSessionPath: persistedSession.path, persisted: true };
@@ -1388,10 +1413,10 @@ describe("SessionController", () => {
     expect(state.sessionActivities[oldSession.id]).toBeUndefined();
   });
 
-  it("does not delete archived sessions when the selected machine runtime does not support it", async () => {
+  it("does not delete archived sessions when the selected machine runtime reports no support", async () => {
     const archivedSession = { ...oldSession, archived: true, archivedAt: "later" };
     const deletedIds: string[] = [];
-    let state: AppState = { ...initialAppState(), selectedWorkspace: workspace, sessions: [archivedSession] };
+    let state: AppState = { ...initialAppState(), selectedWorkspace: workspace, sessions: [archivedSession], machineRuntimes: { local: { machineId: "local", ok: true, checkedAt: "now", capabilities: [] } } };
     const api: typeof defaultApi = {
       ...defaultApi,
       deleteArchived: (session) => {
@@ -1414,6 +1439,32 @@ describe("SessionController", () => {
     expect(state.error).toContain("requires an updated Pi-Web runtime");
   });
 
+  it("allows legacy archived-session deletion when runtime support is unknown", async () => {
+    const archivedSession = { ...oldSession, archived: true, archivedAt: "later" };
+    const deletedIds: string[] = [];
+    let state: AppState = { ...initialAppState(), selectedWorkspace: workspace, selectedSession: archivedSession, sessions: [archivedSession] };
+    const api: typeof defaultApi = {
+      ...defaultApi,
+      deleteArchived: (session) => {
+        deletedIds.push(sessionLookupId(session));
+        return Promise.resolve({ deleted: true });
+      },
+    };
+    const controller = new SessionController(
+      () => state,
+      (patch) => { state = { ...state, ...patch }; },
+      () => undefined,
+      new InMemorySessionSelectionMemory(),
+      { api, socket: new FakeSocket() },
+    );
+
+    await controller.deleteArchivedSessions([archivedSession]);
+
+    expect(deletedIds).toEqual([archivedSession.id]);
+    expect(state.sessions).toEqual([]);
+    expect(state.error).toBe("");
+  });
+
   it("reloads the selected session from disk, discards the cached transcript, and re-fetches history", async () => {
     const persistedSession = { ...oldSession, persisted: true };
     const cacheKey = sessionKey(oldSession.id);
@@ -1496,14 +1547,14 @@ describe("SessionController", () => {
     expect(state.error).toContain("Reloading sessions from disk requires an updated Pi-Web runtime");
   });
 
-  it("does not reload sessions from disk without a persisted server signal", async () => {
+  it("does not reload sessions from disk without a persisted server signal when persistence is authoritative", async () => {
     const reloadCalls: string[] = [];
     let state: AppState = {
       ...initialAppState(),
       selectedWorkspace: workspace,
       selectedSession: oldSession,
       sessions: [oldSession],
-      machineRuntimes: { local: { machineId: "local", ok: true, checkedAt: "now", capabilities: [PI_WEB_CAPABILITIES.sessionsReload] } },
+      machineRuntimes: { local: { machineId: "local", ok: true, checkedAt: "now", capabilities: [PI_WEB_CAPABILITIES.sessionsReload, PI_WEB_CAPABILITIES.sessionsPersistedState] } },
     };
     const api: typeof defaultApi = {
       ...defaultApi,

src/client/src/controllers/sessionController.ts

@@ -8,7 +8,7 @@ import { ChatTranscriptStore } from "../chatTranscriptStore";
 import { isShellInput } from "../inputModes";
 import { fileCompletionInsertText } from "../promptCompletions";
 import { SessionSocket, type GlobalSessionEvent, type SessionUiEvent } from "../sessionSocket";
-import { isArchivableSessionInfo, isTransientNewSessionInfo } from "../sessionPersistence";
+import { isArchivableSessionInfo, isTransientNewSessionInfo, sessionPersistenceOptionsForRuntime } from "../sessionPersistence";
 import { isSessionActive } from "../../../shared/activity";
 import { PI_WEB_CAPABILITIES, supportsPiWebCapability } from "../../../shared/capabilities";
 import type { PromptAttachmentDelivery } from "../../../shared/apiTypes";
@@ -389,11 +389,12 @@ export class SessionController {
   async archiveSession(session = this.getState().selectedSession) {
     if (!session) return;
     const status = this.statusForSession(session);
-    if (isTransientNewSessionInfo(session, status)) {
+    const persistenceOptions = this.sessionPersistenceOptions();
+    if (isTransientNewSessionInfo(session, status, persistenceOptions)) {
       await this.deleteCachedNewSession(session);
       return;
     }
-    if (!isArchivableSessionInfo(session, status)) return;
+    if (!isArchivableSessionInfo(session, status, persistenceOptions)) return;
     try {
       await this.api.archive(session, selectedMachineId(this.getState()));
       const state = this.getState();
@@ -409,7 +410,7 @@ export class SessionController {
   }
 
   async archiveSessionWithDescendants(session = this.getState().selectedSession) {
-    if (session === undefined || !isArchivableSessionInfo(session, this.statusForSession(session))) return;
+    if (session === undefined || !isArchivableSessionInfo(session, this.statusForSession(session), this.sessionPersistenceOptions())) return;
     try {
       const response = await this.api.archiveWithDescendants(session, selectedMachineId(this.getState()));
       const archivedIds = response.sessionIds !== undefined && response.sessionIds.length > 0 ? response.sessionIds : [session.id];
@@ -426,7 +427,8 @@ export class SessionController {
   }
 
   async archiveSessions(sessions: readonly SessionInfo[]): Promise<void> {
-    const candidates = uniqueSessionsById(sessions).filter((session) => isArchivableSessionInfo(session, this.statusForSession(session)));
+    const persistenceOptions = this.sessionPersistenceOptions();
+    const candidates = uniqueSessionsById(sessions).filter((session) => isArchivableSessionInfo(session, this.statusForSession(session), persistenceOptions));
     if (candidates.length === 0) return;
 
     try {
@@ -453,7 +455,9 @@ export class SessionController {
 
     const machineId = selectedMachineId(this.getState());
     const runtime = this.getState().machineRuntimes[machineId];
-    if (runtime?.ok !== true || !supportsPiWebCapability(runtime, PI_WEB_CAPABILITIES.sessionsDeleteArchived)) {
+    // Preserve legacy federated deletes when capability discovery is unavailable;
+    // only a positive runtime response without support should block the action.
+    if (runtime?.ok === true && !supportsPiWebCapability(runtime, PI_WEB_CAPABILITIES.sessionsDeleteArchived)) {
       this.setState({ error: "Deleting archived sessions requires an updated Pi-Web runtime on this machine." });
       return;
     }
@@ -559,7 +563,7 @@ export class SessionController {
   }
 
   async deleteCachedNewSession(session = this.getState().selectedSession) {
-    if (session === undefined || !isTransientNewSessionInfo(session, this.statusForSession(session))) return;
+    if (session === undefined || !isTransientNewSessionInfo(session, this.statusForSession(session), this.sessionPersistenceOptions())) return;
     const pendingStart = isClientPendingStartSessionInfo(session) ? this.pendingSessionStarts.get(session.id) : undefined;
     if (pendingStart !== undefined) {
       pendingStart.discarded = true;
@@ -605,7 +609,7 @@ export class SessionController {
   }
 
   async reloadSession(session = this.getState().selectedSession) {
-    if (session === undefined || !isArchivableSessionInfo(session, this.statusForSession(session))) return;
+    if (session === undefined || !isArchivableSessionInfo(session, this.statusForSession(session), this.sessionPersistenceOptions())) return;
     const machineId = selectedMachineId(this.getState());
     const runtime = this.getState().machineRuntimes[machineId];
     if (runtime?.ok !== true || !supportsPiWebCapability(runtime, PI_WEB_CAPABILITIES.sessionsReload)) {
@@ -757,6 +761,11 @@ export class SessionController {
     return state.sessionStatuses[session.id];
   }
 
+  private sessionPersistenceOptions() {
+    const state = this.getState();
+    return sessionPersistenceOptionsForRuntime(state.machineRuntimes[selectedMachineId(state)]);
+  }
+
   private workspaceSelectionKey(cwd: string): string {
     return `${selectedMachineId(this.getState())}:${cwd}`;
   }

src/client/src/plugins/core/actions.ts

@@ -2,7 +2,7 @@ import { isSessionActive } from "../../../../shared/activity";
 import { PI_WEB_CAPABILITIES, supportsPiWebCapability, type PiWebCapability } from "../../../../shared/capabilities";
 import type { AppState } from "../../appState";
 import { selectedMachineId } from "../../controllers/types";
-import { isArchivableSessionInfo, isTransientNewSessionInfo } from "../../sessionPersistence";
+import { isArchivableSessionInfo, isTransientNewSessionInfo, sessionPersistenceOptionsForRuntime } from "../../sessionPersistence";
 import { isWorkspaceDeletionPending } from "../../workspaceDeletion";
 import type { PluginAction } from "../types";
 
@@ -217,25 +217,29 @@ function hasDeletableWorkspace(context: { state: AppState }): boolean {
 }
 
 function hasArchivableSession(context: { state: AppState }): boolean {
-  return isArchivableSessionInfo(context.state.selectedSession, context.state.status);
+  return isArchivableSessionInfo(context.state.selectedSession, context.state.status, sessionPersistenceOptions(context.state));
 }
 
 function hasTransientNewSession(context: { state: AppState }): boolean {
-  return isTransientNewSessionInfo(context.state.selectedSession, context.state.status);
+  return isTransientNewSessionInfo(context.state.selectedSession, context.state.status, sessionPersistenceOptions(context.state));
 }
 
 function hasReloadableSession(context: { state: AppState }): boolean {
-  if (!isArchivableSessionInfo(context.state.selectedSession, context.state.status)) return false;
+  if (!isArchivableSessionInfo(context.state.selectedSession, context.state.status, sessionPersistenceOptions(context.state))) return false;
   if (reloadSessionDisabledReason(context) !== undefined) return false;
   return !isSessionActive(context.state.status, context.state.activity);
 }
 
 function reloadSessionDisabledReason(context: { state: AppState }): string | undefined {
-  if (!isArchivableSessionInfo(context.state.selectedSession, context.state.status)) return undefined;
+  if (!isArchivableSessionInfo(context.state.selectedSession, context.state.status, sessionPersistenceOptions(context.state))) return undefined;
   if (isSessionActive(context.state.status, context.state.activity)) return undefined;
   return missingCapabilityReason(context.state, PI_WEB_CAPABILITIES.sessionsReload, "reload sessions from disk");
 }
 
+function sessionPersistenceOptions(state: AppState) {
+  return sessionPersistenceOptionsForRuntime(state.machineRuntimes[selectedMachineId(state)]);
+}
+
 function missingCapabilityReason(state: AppState, capability: PiWebCapability, action: string): string | undefined {
   const runtime = state.machineRuntimes[selectedMachineId(state)];
   if (runtime?.ok === true && supportsPiWebCapability(runtime, capability)) return undefined;

src/client/src/plugins/registry.test.ts

@@ -177,14 +177,19 @@ describe("PluginRegistry", () => {
     const registry = new PluginRegistry();
     registry.register({ id: "core", plugin: corePlugin });
 
-    const persistedActions = registry.getActions(createContext({ selectedSession: testSession({ persisted: true }) }).context);
+    const persistedStateRuntime = { local: { machineId: "local", ok: true as const, checkedAt: "now", capabilities: [PI_WEB_CAPABILITIES.sessionsPersistedState] } };
+    const persistedActions = registry.getActions(createContext({ selectedSession: testSession({ persisted: true }), machineRuntimes: persistedStateRuntime }).context);
     expect(persistedActions.find((action) => action.id === "core:session.archive")?.enabled).toBe(true);
     expect(persistedActions.find((action) => action.id === "core:session.delete")?.enabled).toBe(false);
 
-    const unknownActions = registry.getActions(createContext({ selectedSession: testSession() }).context);
+    const unknownActions = registry.getActions(createContext({ selectedSession: testSession(), machineRuntimes: persistedStateRuntime }).context);
     expect(unknownActions.find((action) => action.id === "core:session.archive")?.enabled).toBe(false);
     expect(unknownActions.find((action) => action.id === "core:session.delete")?.enabled).toBe(false);
 
+    const legacyUnknownActions = registry.getActions(createContext({ selectedSession: testSession() }).context);
+    expect(legacyUnknownActions.find((action) => action.id === "core:session.archive")?.enabled).toBe(true);
+    expect(legacyUnknownActions.find((action) => action.id === "core:session.delete")?.enabled).toBe(false);
+
     const transientActions = registry.getActions(createContext({ selectedSession: testSession({ persisted: false }) }).context);
     expect(transientActions.find((action) => action.id === "core:session.archive")?.enabled).toBe(false);
     expect(transientActions.find((action) => action.id === "core:session.delete")?.enabled).toBe(true);
@@ -214,7 +219,8 @@ describe("PluginRegistry", () => {
   it("enables session disk reload only for a writable session on a capable, idle runtime", () => {
     const registry = new PluginRegistry();
     registry.register({ id: "core", plugin: corePlugin });
-    const reloadRuntime = { local: { machineId: "local", ok: true as const, checkedAt: "now", capabilities: [PI_WEB_CAPABILITIES.sessionsReload] } };
+    const reloadRuntime = { local: { machineId: "local", ok: true as const, checkedAt: "now", capabilities: [PI_WEB_CAPABILITIES.sessionsReload, PI_WEB_CAPABILITIES.sessionsPersistedState] } };
+    const legacyReloadRuntime = { local: { machineId: "local", ok: true as const, checkedAt: "now", capabilities: [PI_WEB_CAPABILITIES.sessionsReload] } };
 
     const reloadable = registry.getActions(createContext({ selectedSession: testSession({ persisted: true }), machineRuntimes: reloadRuntime }).context);
     const reloadableAction = reloadable.find((action) => action.id === "core:session.reload");
@@ -230,6 +236,9 @@ describe("PluginRegistry", () => {
     const unknown = registry.getActions(createContext({ selectedSession: testSession(), machineRuntimes: reloadRuntime }).context);
     expect(unknown.find((action) => action.id === "core:session.reload")?.enabled).toBe(false);
 
+    const legacyUnknown = registry.getActions(createContext({ selectedSession: testSession(), machineRuntimes: legacyReloadRuntime }).context);
+    expect(legacyUnknown.find((action) => action.id === "core:session.reload")?.enabled).toBe(true);
+
     const transient = registry.getActions(createContext({ selectedSession: testSession({ persisted: false }), machineRuntimes: reloadRuntime }).context);
     expect(transient.find((action) => action.id === "core:session.reload")?.enabled).toBe(false);
 

src/client/src/sessionPersistence.ts

@@ -1,21 +1,40 @@
-import type { SessionInfo, SessionStatus } from "./api";
+import type { MachineRuntime, SessionInfo, SessionStatus } from "./api";
 import { isCachedNewSessionInfo } from "./cachedNewSessions";
+import { PI_WEB_CAPABILITIES, supportsPiWebCapability } from "../../shared/capabilities";
 
 export type SessionPersistenceState = "persisted" | "transient" | "unknown";
 
-export function sessionPersistenceState(session: SessionInfo | undefined, status?: SessionStatus): SessionPersistenceState {
+export interface SessionPersistenceOptions {
+  /**
+   * True when the selected runtime advertises reliable persisted/transient
+   * session state. Legacy federated runtimes omit this field, so missing data
+   * must preserve the old "listed sessions are persisted" behavior.
+   */
+  authoritative?: boolean;
+}
+
+export function hasAuthoritativeSessionPersistence(runtime: Pick<MachineRuntime, "ok" | "capabilities"> | undefined): boolean {
+  return runtime?.ok === true && supportsPiWebCapability(runtime, PI_WEB_CAPABILITIES.sessionsPersistedState);
+}
+
+export function sessionPersistenceOptionsForRuntime(runtime: Pick<MachineRuntime, "ok" | "capabilities"> | undefined): SessionPersistenceOptions {
+  return { authoritative: hasAuthoritativeSessionPersistence(runtime) };
+}
+
+export function sessionPersistenceState(session: SessionInfo | undefined, status?: SessionStatus, options: SessionPersistenceOptions = {}): SessionPersistenceState {
   if (session === undefined) return "unknown";
   const statusPersisted = status?.sessionId === session.id ? status.persisted : undefined;
   const persisted = statusPersisted ?? session.persisted;
   if (persisted === true) return "persisted";
   if (persisted === false || isCachedNewSessionInfo(session)) return "transient";
+  if (options.authoritative !== true) return "persisted";
   return "unknown";
 }
 
-export function isArchivableSessionInfo(session: SessionInfo | undefined, status?: SessionStatus): boolean {
+export function isArchivableSessionInfo(session: SessionInfo | undefined, status?: SessionStatus, options?: SessionPersistenceOptions): boolean {
-  return session !== undefined && session.archived !== true && sessionPersistenceState(session, status) === "persisted";
+  return session !== undefined && session.archived !== true && sessionPersistenceState(session, status, options) === "persisted";
 }
 
-export function isTransientNewSessionInfo(session: SessionInfo | undefined, status?: SessionStatus): boolean {
+export function isTransientNewSessionInfo(session: SessionInfo | undefined, status?: SessionStatus, options?: SessionPersistenceOptions): boolean {
-  return session !== undefined && session.archived !== true && sessionPersistenceState(session, status) === "transient";
+  return session !== undefined && session.archived !== true && sessionPersistenceState(session, status, options) === "transient";
 }

src/shared/apiTypes.ts

@@ -6,6 +6,7 @@ export const PI_WEB_CAPABILITIES = {
   sessionsBulkMutations: "sessions.bulkMutations",
   sessionsCleanup: "sessions.cleanup",
   sessionsReload: "sessions.reload",
+  sessionsPersistedState: "sessions.persistedState",
   promptAttachments: "prompt.attachments",
   workspaceFileSuggestions: "workspace.fileSuggestions",
   piPackagesManage: "piPackages.manage",

src/shared/capabilities.test.ts

@@ -14,6 +14,20 @@ describe("PI WEB capabilities", () => {
     })).toEqual([PI_WEB_CAPABILITIES.piPackagesManage, PI_WEB_CAPABILITIES.selectedMachineSettings]);
   });
 
+  it("requires web and session daemon support for authoritative session persistence", () => {
+    expect(WEB_RUNTIME_CAPABILITIES).toContain(PI_WEB_CAPABILITIES.sessionsPersistedState);
+    expect(SESSIOND_RUNTIME_CAPABILITIES).toContain(PI_WEB_CAPABILITIES.sessionsPersistedState);
+
+    expect(effectivePiWebCapabilities({
+      web: { available: true, capabilities: [PI_WEB_CAPABILITIES.sessionsPersistedState] },
+      sessiond: { available: false, capabilities: [PI_WEB_CAPABILITIES.sessionsPersistedState] },
+    })).not.toContain(PI_WEB_CAPABILITIES.sessionsPersistedState);
+    expect(effectivePiWebCapabilities({
+      web: { available: true, capabilities: [PI_WEB_CAPABILITIES.sessionsPersistedState] },
+      sessiond: { available: true, capabilities: [PI_WEB_CAPABILITIES.sessionsPersistedState] },
+    })).toContain(PI_WEB_CAPABILITIES.sessionsPersistedState);
+  });
+
   it("keeps only known string capabilities when parsing runtime data", () => {
     expect(parseKnownPiWebCapabilities([PI_WEB_CAPABILITIES.piPackagesManage, PI_WEB_CAPABILITIES.selectedMachineSettings, "future.capability"])).toEqual([PI_WEB_CAPABILITIES.piPackagesManage, PI_WEB_CAPABILITIES.selectedMachineSettings]);
     expect(parseKnownPiWebCapabilities([PI_WEB_CAPABILITIES.piPackagesManage, 1])).toBeUndefined();

src/shared/capabilities.ts

@@ -11,6 +11,7 @@ export const WEB_RUNTIME_CAPABILITIES = [
   PI_WEB_CAPABILITIES.sessionsBulkMutations,
   PI_WEB_CAPABILITIES.sessionsCleanup,
   PI_WEB_CAPABILITIES.sessionsReload,
+  PI_WEB_CAPABILITIES.sessionsPersistedState,
   PI_WEB_CAPABILITIES.promptAttachments,
   PI_WEB_CAPABILITIES.workspaceFileSuggestions,
   PI_WEB_CAPABILITIES.piPackagesManage,
@@ -22,6 +23,7 @@ export const SESSIOND_RUNTIME_CAPABILITIES = [
   PI_WEB_CAPABILITIES.sessionsBulkMutations,
   PI_WEB_CAPABILITIES.sessionsCleanup,
   PI_WEB_CAPABILITIES.sessionsReload,
+  PI_WEB_CAPABILITIES.sessionsPersistedState,
   PI_WEB_CAPABILITIES.promptAttachments,
 ] as const satisfies readonly PiWebCapability[];
 
@@ -30,6 +32,7 @@ const EFFECTIVE_CAPABILITY_REQUIREMENTS = {
   [PI_WEB_CAPABILITIES.sessionsBulkMutations]: ["web", "sessiond"],
   [PI_WEB_CAPABILITIES.sessionsCleanup]: ["web", "sessiond"],
   [PI_WEB_CAPABILITIES.sessionsReload]: ["web", "sessiond"],
+  [PI_WEB_CAPABILITIES.sessionsPersistedState]: ["web", "sessiond"],
   [PI_WEB_CAPABILITIES.promptAttachments]: ["web", "sessiond"],
   [PI_WEB_CAPABILITIES.workspaceFileSuggestions]: ["web"],
   [PI_WEB_CAPABILITIES.piPackagesManage]: ["web"],