diff --git a/src/main/app/create-window.ts b/src/main/app/create-window.ts
index c383e648..b9b6cd3d 100644
--- a/src/main/app/create-window.ts
+++ b/src/main/app/create-window.ts
@@ -1,5 +1,6 @@
 import { BrowserWindow } from "electron";
 import { join } from "node:path";
+import { pathToFileURL } from "node:url";
 import { attachMainWindowSecurity } from "./window-security";
 
 export interface CreateWindowOptions {
@@ -10,6 +11,11 @@ export interface CreateWindowOptions {
   language: string;
 }
 
+/** The one page the main window may show and the IPC gate trusts: the dev server in development, the built index.html otherwise. */
+export function appPageUrl(options: Pick<CreateWindowOptions, "devServerUrl" | "rendererDist">): string {
+  return options.devServerUrl ?? pathToFileURL(join(options.rendererDist, "index.html")).href;
+}
+
 export function createMainWindow(options: CreateWindowOptions): BrowserWindow {
   const win = new BrowserWindow({
     width: 1280,
@@ -33,10 +39,7 @@ export function createMainWindow(options: CreateWindowOptions): BrowserWindow {
     },
   });
 
-  attachMainWindowSecurity(
-    win,
-    options.devServerUrl ? new URL(options.devServerUrl).origin : null,
-  );
+  attachMainWindowSecurity(win, appPageUrl(options));
   win.once("ready-to-show", () => win.show());
 
   if (options.devServerUrl) {
diff --git a/src/main/app/ipc-contracts/collaboration.ts b/src/main/app/ipc-contracts/collaboration.ts
new file mode 100644
index 00000000..a187869d
--- /dev/null
+++ b/src/main/app/ipc-contracts/collaboration.ts
@@ -0,0 +1,56 @@
+import { z } from "zod";
+import type * as C from "../../../shared/commands";
+
+const id = z.string();
+const nullableId = z.string().nullable();
+const actor = z.enum(["employee", "agent"]);
+const sender = z.enum(["employee", "agent", "board", "system"]);
+const settings = z.record(z.string(), z.unknown());
+
+export const collaborationContracts = {
+  createDocument: z.strictObject({
+    orgId: id, title: z.string(), docType: z.string(), content: z.string(), authorAgentId: nullableId, reviewerAgentId: nullableId,
+    projectId: nullableId, goalId: nullableId, taskId: nullableId,
+  }) satisfies z.ZodType<C.CreateDocumentInput>,
+  updateDocument: z.strictObject({
+    orgId: id, documentId: id, title: z.string(), content: z.string(), status: z.string(), reason: z.string(), changedByType: actor, changedById: id,
+  }) satisfies z.ZodType<C.UpdateDocumentInput>,
+  deleteDocument: z.strictObject({ orgId: id, documentId: id, deletedByEmployeeId: id }) satisfies z.ZodType<C.DeleteDocumentInput>,
+  listDocumentVersions: z.strictObject({ orgId: id, documentId: id }) satisfies z.ZodType<C.ListDocumentVersionsInput>,
+  createKnowledgeEntry: z.strictObject({
+    orgId: id, topic: z.string(), category: z.string(), content: z.string(), importance: z.string(), sourceType: z.string(), sourceId: nullableId,
+    scopeType: z.enum(["organization", "project", "goal", "task", "agent"]), scopeId: nullableId, validUntil: z.string().nullable(), supersedesId: nullableId,
+  }) satisfies z.ZodType<C.CreateKnowledgeEntryInput>,
+  updateKnowledgeEntry: z.strictObject({
+    orgId: id, entryId: id, topic: z.string(), category: z.string(), content: z.string(), importance: z.string(), reason: z.string(),
+    changedByType: actor, changedById: id,
+  }) satisfies z.ZodType<C.UpdateKnowledgeEntryInput>,
+  deleteKnowledgeEntry: z.strictObject({ orgId: id, entryId: id, deletedByEmployeeId: id }) satisfies z.ZodType<C.DeleteKnowledgeEntryInput>,
+  listKnowledgeRevisions: z.strictObject({ orgId: id, entryId: id }) satisfies z.ZodType<C.ListKnowledgeRevisionsInput>,
+  createAutomationRule: z.strictObject({
+    orgId: id, name: z.string(), triggerEvent: z.string(), conditions: settings, actionType: z.string(), actionConfig: settings,
+    priority: z.number(), enabled: z.boolean(),
+  }) satisfies z.ZodType<C.CreateAutomationRuleInput>,
+  updateAutomationRule: z.strictObject({
+    orgId: id, ruleId: id, name: z.string(), triggerEvent: z.string(), conditions: settings, actionType: z.string(), actionConfig: settings,
+    priority: z.number(), enabled: z.boolean(),
+  }) satisfies z.ZodType<C.UpdateAutomationRuleInput>,
+  deleteAutomationRule: z.strictObject({ orgId: id, ruleId: id }) satisfies z.ZodType<C.DeleteAutomationRuleInput>,
+  createMeeting: z.strictObject({
+    orgId: id, title: z.string(), meetingType: z.string(), scheduledAt: z.string().nullable(), durationMinutes: z.number(), agenda: z.string(),
+  }) satisfies z.ZodType<C.CreateMeetingInput>,
+  deleteMeeting: z.strictObject({ orgId: id, meetingId: id }) satisfies z.ZodType<C.DeleteMeetingInput>,
+  createSprint: z.strictObject({ orgId: id, name: z.string(), goal: z.string(), startDate: z.string(), endDate: z.string() }) satisfies z.ZodType<C.CreateSprintInput>,
+  deleteSprint: z.strictObject({ orgId: id, sprintId: id }) satisfies z.ZodType<C.DeleteSprintInput>,
+  createChatSpace: z.strictObject({
+    orgId: id, spaceType: z.enum(["company", "division", "department", "project", "pod", "ad_hoc", "direct"]), name: z.string(), topic: z.string(),
+    visibility: z.enum(["workspace", "restricted"]), retentionPolicy: z.enum(["standard_365d", "restricted_365d"]).optional(),
+    memberEmployeeIds: z.array(id).optional(), memberAgentIds: z.array(id).optional(),
+  }) satisfies z.ZodType<C.CreateChatSpaceInput>,
+  sendMessage: z.strictObject({
+    orgId: id, spaceId: id, threadId: nullableId, senderType: sender, senderId: nullableId, bodyMd: z.string(), attachmentFileIds: z.array(id).optional(),
+  }) satisfies z.ZodType<C.SendMessageInput>,
+  editMessage: z.strictObject({ orgId: id, messageId: id, actorType: sender, actorId: nullableId, bodyMd: z.string() }) satisfies z.ZodType<C.EditMessageInput>,
+  deleteMessage: z.strictObject({ orgId: id, messageId: id, actorType: sender, actorId: nullableId }) satisfies z.ZodType<C.DeleteMessageInput>,
+  markChatSpaceRead: z.strictObject({ orgId: id, employeeId: id, spaceId: id }) satisfies z.ZodType<C.MarkChatSpaceReadInput>,
+};
diff --git a/src/main/app/ipc-contracts/index.ts b/src/main/app/ipc-contracts/index.ts
new file mode 100644
index 00000000..d48feb3e
--- /dev/null
+++ b/src/main/app/ipc-contracts/index.ts
@@ -0,0 +1,24 @@
+import { z } from "zod";
+import type { DesktopApi } from "../../../shared/desktop-api";
+import { collaborationContracts } from "./collaboration";
+import { organizationContracts } from "./organization";
+import { platformContracts } from "./platform";
+
+/** Every desktop API method the renderer invokes (not the event subscription or the constants). */
+export type InvokedMethod = { [K in keyof DesktopApi]: DesktopApi[K] extends (...args: never[]) => Promise<unknown> ? K : never }[keyof DesktopApi];
+export type InputOf<K extends InvokedMethod> = Parameters<DesktopApi[K]> extends [infer I] ? I : undefined;
+
+const noInput = z.undefined();
+
+/** The runtime contract of each IPC call; a method without a schema, or a schema that disagrees with its type, fails the typecheck. */
+export const IPC_CONTRACTS: { [K in InvokedMethod]: z.ZodType<InputOf<K>> } = {
+  loadSnapshot: noInput,
+  pickDirectory: noInput,
+  listConnectorCatalog: noInput,
+  windowMinimize: noInput,
+  windowMaximize: noInput,
+  windowClose: noInput,
+  ...organizationContracts,
+  ...collaborationContracts,
+  ...platformContracts,
+};
diff --git a/src/main/app/ipc-contracts/organization.ts b/src/main/app/ipc-contracts/organization.ts
new file mode 100644
index 00000000..d3e53f43
--- /dev/null
+++ b/src/main/app/ipc-contracts/organization.ts
@@ -0,0 +1,69 @@
+import { z } from "zod";
+import type * as C from "../../../shared/commands";
+import { APPROVAL_STATE, RISK_LEVEL, TASK_PRIORITY, TASK_STATUS, WRITING_MODE } from "../../../shared/domain";
+import { IDENTITY_SOURCE, ROLE_KEY } from "../../../shared/identity-domain";
+
+const id = z.string();
+const nullableId = z.string().nullable();
+
+export const organizationContracts = {
+  bootstrapOnboarding: z.strictObject({
+    companyName: z.string(), companyDescription: z.string(), employeeName: z.string(), workspacePath: z.string(),
+    executionMode: z.enum(["ai_ceo", "ai_cofounder"]), autoApproveHires: z.boolean(), reviewDeliverables: z.boolean(),
+    goalTitle: z.string(), goalDescription: z.string(), providerKey: z.string(), providerSecret: z.string(), providerModel: z.string(),
+  }) satisfies z.ZodType<C.BootstrapOnboardingInput>,
+  setActiveOrganization: z.strictObject({ orgId: id }) satisfies z.ZodType<C.SetActiveOrganizationInput>,
+  setUiPreferences: z.strictObject({ theme: z.enum(["system", "light", "dark"]).optional(), language: z.enum(["en", "zh"]).optional() }) satisfies z.ZodType<C.SetUiPreferencesInput>,
+  deleteOrganization: z.strictObject({ orgId: id }) satisfies z.ZodType<C.DeleteOrganizationInput>,
+  createOrganization: z.strictObject({
+    organizationName: z.string(), description: z.string().optional(), mission: z.string(), goal: z.string(), employeeName: z.string(),
+    executionMode: z.enum(["ai_ceo", "ai_cofounder"]).optional(), autoApproveHires: z.boolean().optional(), reviewDeliverables: z.boolean().optional(),
+  }) satisfies z.ZodType<C.CreateOrganizationInput>,
+  createAgent: z.strictObject({
+    orgId: id, name: z.string(), role: z.string(), department: z.string(), modelProviderId: nullableId, modelId: nullableId,
+    budgetCents: z.number(), managerAgentId: nullableId, title: z.string().optional(), roleLevel: z.string().optional(),
+    modelStrategy: z.string().optional(), workspaceId: nullableId.optional(), heartbeatEnabled: z.boolean().optional(), heartbeatIntervalSec: z.number().optional(),
+  }) satisfies z.ZodType<C.CreateAgentInput>,
+  updateAgent: z.strictObject({
+    orgId: id, agentId: id, name: z.string().optional(), role: z.string(), title: z.string(), roleLevel: z.string(), department: z.string(),
+    budgetCents: z.number(), modelProviderId: nullableId, modelId: nullableId,
+    avatarEmoji: z.string().optional(), avatarColor: z.string().optional(), avatarImage: z.string().optional(),
+  }) satisfies z.ZodType<C.UpdateAgentInput>,
+  updateEmployeeProfile: z.strictObject({
+    orgId: id, employeeId: id, displayName: z.string(), avatarEmoji: z.string().optional(), avatarColor: z.string().optional(), avatarImage: z.string().optional(),
+  }) satisfies z.ZodType<C.UpdateEmployeeProfileInput>,
+  setAutonomousPaused: z.strictObject({ paused: z.boolean() }) satisfies z.ZodType<C.SetAutonomousPausedInput>,
+  stopRun: z.strictObject({ runId: id }) satisfies z.ZodType<C.StopRunInput>,
+  createTask: z.strictObject({
+    orgId: id, title: z.string(), description: z.string(), status: z.enum(TASK_STATUS), assigneeAgentId: nullableId, risk: z.enum(RISK_LEVEL),
+    projectId: nullableId, goalId: nullableId, workspaceId: nullableId, priority: z.enum(TASK_PRIORITY), requiresFilesystem: z.boolean(),
+    writingMode: z.enum(WRITING_MODE).optional(), origin: z.enum(["chat_wake", "goal_review", "task_review"]).optional(),
+  }) satisfies z.ZodType<C.CreateTaskInput>,
+  updateTask: z.strictObject({
+    orgId: id, taskId: id, title: z.string(), description: z.string(), assigneeAgentId: nullableId, risk: z.enum(RISK_LEVEL),
+    priority: z.enum(TASK_PRIORITY), parentTaskId: nullableId,
+  }) satisfies z.ZodType<C.UpdateTaskInput>,
+  deleteTask: z.strictObject({ orgId: id, taskId: id }) satisfies z.ZodType<C.DeleteTaskInput>,
+  updateTaskStatus: z.strictObject({ orgId: id, taskId: id, status: z.enum(TASK_STATUS) }) satisfies z.ZodType<C.UpdateTaskStatusInput>,
+  runTask: z.strictObject({ orgId: id, taskId: id }) satisfies z.ZodType<C.RunTaskInput>,
+  createGoal: z.strictObject({ orgId: id, title: z.string(), description: z.string(), ownerAgentId: nullableId }) satisfies z.ZodType<C.CreateGoalInput>,
+  resumeGoal: z.strictObject({ orgId: id, goalId: id }) satisfies z.ZodType<C.ResumeGoalInput>,
+  createProject: z.strictObject({
+    orgId: id, goalId: nullableId, name: z.string(), description: z.string(), leadAgentId: nullableId,
+  }) satisfies z.ZodType<C.CreateProjectInput>,
+  createWorkspace: z.strictObject({ orgId: id, name: z.string(), localPath: z.string(), projectId: nullableId }) satisfies z.ZodType<C.CreateWorkspaceInput>,
+  createApproval: z.strictObject({
+    orgId: id, kind: z.string(), title: z.string(), details: z.string(), risk: z.enum(RISK_LEVEL),
+    requestedByType: z.enum(["employee", "agent", "system"]), requestedById: nullableId,
+  }) satisfies z.ZodType<C.CreateApprovalInput>,
+  decideApproval: z.strictObject({
+    orgId: id, approvalId: id, state: z.enum([APPROVAL_STATE.APPROVED, APPROVAL_STATE.DECLINED]), decidedByEmployeeId: id, notes: z.string().optional(),
+  }) satisfies z.ZodType<C.DecideApprovalInput>,
+  syncEmployeeIdentity: z.strictObject({
+    orgId: id, employeeId: id, source: z.enum(IDENTITY_SOURCE), externalSubject: z.string(), email: z.string().nullable(),
+  }) satisfies z.ZodType<C.SyncEmployeeIdentityInput>,
+  grantRole: z.strictObject({
+    orgId: id, principalType: z.enum(["employee", "agent", "service_identity"]), principalId: id, roleKey: z.enum(ROLE_KEY),
+    scopeType: z.enum(["organization", "workspace", "project", "department"]), scopeId: id, grantedByEmployeeId: id,
+  }) satisfies z.ZodType<C.GrantRoleInput>,
+};
diff --git a/src/main/app/ipc-contracts/platform.ts b/src/main/app/ipc-contracts/platform.ts
new file mode 100644
index 00000000..8278412a
--- /dev/null
+++ b/src/main/app/ipc-contracts/platform.ts
@@ -0,0 +1,85 @@
+import { z } from "zod";
+import type * as C from "../../../shared/commands";
+import { INTEGRATION_KEY_NAMES } from "../../../shared/commands";
+import { COMPLIANCE_EXPORT_TYPE } from "../../../shared/compliance-domain";
+import { SOCIAL_PLATFORM } from "../../../shared/domain";
+import { PROVIDER_DATA_POLICY, PROVIDER_EXECUTION_MODE } from "../../../shared/provider-policy-domain";
+import { SDLC_REVIEW_TARGET_TYPE } from "../../../shared/sdlc-domain";
+import { SEARCH_ENTITY_TYPES } from "../../../shared/search-domain";
+
+const id = z.string();
+const nullableId = z.string().nullable();
+const providerResponse = z.strictObject({
+  orgId: id, providerId: id, workspaceId: nullableId.optional(), prompt: z.string(), instructions: z.string().nullable(),
+  executionMode: z.enum(PROVIDER_EXECUTION_MODE).optional(),
+}) satisfies z.ZodType<C.CreateProviderResponseInput>;
+
+export const platformContracts = {
+  setIntegrationKey: z.strictObject({ name: z.enum(INTEGRATION_KEY_NAMES), value: z.string() }) satisfies z.ZodType<C.SetIntegrationKeyInput>,
+  clearIntegrationKey: z.strictObject({ name: z.enum(INTEGRATION_KEY_NAMES) }) satisfies z.ZodType<C.ClearIntegrationKeyInput>,
+  saveProviderCredential: z.strictObject({ orgId: id, providerId: id, secret: z.string(), model: z.string().nullable() }) satisfies z.ZodType<C.SaveProviderCredentialInput>,
+  revokeProviderCredential: z.strictObject({ orgId: id, providerId: id }) satisfies z.ZodType<C.RevokeProviderCredentialInput>,
+  startProviderOAuth: z.strictObject({
+    providerKey: z.string(), enterpriseDomain: z.string().nullable().optional(), orgId: id.optional(), providerId: id.optional(),
+    employeeId: id.optional(), model: z.string().nullable().optional(),
+  }) satisfies z.ZodType<C.StartProviderOAuthInput>,
+  cancelProviderOAuth: z.strictObject({ providerKey: z.string() }) satisfies z.ZodType<C.CancelProviderOAuthInput>,
+  checkProviderHealth: z.strictObject({ orgId: id, providerId: id }) satisfies z.ZodType<C.CheckProviderHealthInput>,
+  listProviderModels: z.strictObject({ providerKey: z.string(), secret: z.string().optional(), orgId: id.optional(), providerId: id.optional() }) satisfies z.ZodType<C.ListProviderModelsInput>,
+  checkProviderModel: z.strictObject({ orgId: id, providerId: id, model: z.string() }),
+  updateProviderPolicy: z.strictObject({
+    orgId: id, providerId: id, dataPolicy: z.enum(PROVIDER_DATA_POLICY), backgroundEnabled: z.boolean(), monthlyRequestLimit: z.number(),
+    workspaceScope: z.enum(["organization", "workspace"]), contextWindowTokens: z.number(),
+  }) satisfies z.ZodType<C.UpdateProviderPolicyInput>,
+  setProviderPrices: z.strictObject({
+    orgId: id, providerId: id, inputDollarsPerMtok: z.number().nullable(), cachedInputDollarsPerMtok: z.number().nullable(), outputDollarsPerMtok: z.number().nullable(),
+  }) satisfies z.ZodType<C.SetProviderPricesInput>,
+  setGoalAuditor: z.strictObject({ orgId: id, providerId: id, modelId: z.string() }),
+  openExternalUrl: z.string(),
+  createProviderResponse: providerResponse,
+  streamProviderResponse: providerResponse,
+  cancelProviderResponse: z.strictObject({ orgId: id, requestId: id, providerResponseId: id.optional() }) satisfies z.ZodType<C.CancelProviderResponseInput>,
+  createSocialAccount: z.strictObject({
+    orgId: id, platform: z.enum(SOCIAL_PLATFORM), handle: z.string(), displayName: z.string(), createdByEmployeeId: id, authorizedEmployeeId: nullableId,
+  }) satisfies z.ZodType<C.CreateSocialAccountInput>,
+  launchSocialLogin: z.strictObject({ orgId: id, socialAccountId: id, employeeId: id }) satisfies z.ZodType<C.LaunchSocialLoginInput>,
+  createScheduledPost: z.strictObject({
+    orgId: id, socialAccountId: id, bodyMd: z.string(), scheduledFor: z.string(), createdByEmployeeId: id,
+  }) satisfies z.ZodType<C.CreateScheduledPostInput>,
+  setScheduledPostState: z.strictObject({
+    orgId: id, scheduledPostId: id, state: z.enum(["draft", "scheduled", "published", "cancelled"]), employeeId: id,
+  }) satisfies z.ZodType<C.SetScheduledPostStateInput>,
+  importFile: z.strictObject({ orgId: id }) satisfies z.ZodType<C.ImportFileInput>,
+  openFile: z.strictObject({ orgId: id, fileId: id }) satisfies z.ZodType<C.OpenFileInput>,
+  setFilePinned: z.strictObject({ orgId: id, fileId: id, pinned: z.boolean() }) satisfies z.ZodType<C.SetFilePinnedInput>,
+  createMigrationReport: z.strictObject({ orgId: id, sourceDatabasePath: z.string() }) satisfies z.ZodType<C.CreateMigrationReportInput>,
+  createRollbackSnapshot: z.strictObject({ orgId: id, migrationReportId: id, createdByEmployeeId: id }) satisfies z.ZodType<C.CreateRollbackSnapshotInput>,
+  setRollbackSnapshotActive: z.strictObject({ orgId: id, snapshotId: id, active: z.boolean(), employeeId: id }) satisfies z.ZodType<C.SetRollbackSnapshotActiveInput>,
+  resolveMigrationReconciliation: z.strictObject({ orgId: id, reconciliationItemId: id, employeeId: id }) satisfies z.ZodType<C.ResolveMigrationReconciliationInput>,
+  setFeatureFlag: z.strictObject({ orgId: id, flagId: id, enabled: z.boolean() }) satisfies z.ZodType<C.SetFeatureFlagInput>,
+  runChaosDrill: z.strictObject({ orgId: id, drillId: id }) satisfies z.ZodType<C.RunChaosDrillInput>,
+  runSdlcReview: z.strictObject({ orgId: id, reviewAgentId: id, targetType: z.enum(SDLC_REVIEW_TARGET_TYPE), targetRef: z.string() }) satisfies z.ZodType<C.RunSdlcReviewInput>,
+  runEvalSuite: z.strictObject({ orgId: id, suiteId: id }) satisfies z.ZodType<C.RunEvalSuiteInput>,
+  setPrBotGate: z.strictObject({ orgId: id, gateId: id, enabled: z.boolean() }) satisfies z.ZodType<C.SetPrBotGateInput>,
+  createComplianceExport: z.strictObject({
+    orgId: id, subjectType: z.enum(["employee", "agent"]), subjectId: id, exportType: z.enum(COMPLIANCE_EXPORT_TYPE), requestedByEmployeeId: id,
+  }) satisfies z.ZodType<C.CreateComplianceExportInput>,
+  createAuditReplay: z.strictObject({ orgId: id, threadId: id, createdByEmployeeId: id }) satisfies z.ZodType<C.CreateAuditReplayInput>,
+  createLegalHold: z.strictObject({
+    orgId: id, entityType: z.enum(["organization", "employee", "agent", "chat_thread", "file_object"]), entityId: id, reason: z.string(), createdByEmployeeId: id,
+  }) satisfies z.ZodType<C.CreateLegalHoldInput>,
+  setLegalHoldState: z.strictObject({ orgId: id, legalHoldId: id, active: z.boolean(), employeeId: id }) satisfies z.ZodType<C.SetLegalHoldStateInput>,
+  createRetentionFreeze: z.strictObject({
+    orgId: id, scopeType: z.enum(["organization", "chat_space", "file_object"]), scopeId: id, reason: z.string(), createdByEmployeeId: id,
+  }) satisfies z.ZodType<C.CreateRetentionFreezeInput>,
+  setRetentionFreezeState: z.strictObject({ orgId: id, retentionFreezeId: id, active: z.boolean(), employeeId: id }) satisfies z.ZodType<C.SetRetentionFreezeStateInput>,
+  connectComposioToolkit: z.strictObject({ orgId: id, toolkitSlug: z.string(), label: z.string() }) satisfies z.ZodType<C.ConnectComposioToolkitInput>,
+  disconnectComposioToolkit: z.strictObject({ orgId: id, toolkitSlug: z.string(), label: z.string() }) satisfies z.ZodType<C.DisconnectComposioToolkitInput>,
+  refreshComposioAccounts: z.strictObject({ orgId: id }) satisfies z.ZodType<C.RefreshComposioAccountsInput>,
+  grantConnector: z.strictObject({ orgId: id, agentId: id, toolkitSlug: z.string(), accountLabel: z.string(), employeeId: id }) satisfies z.ZodType<C.GrantConnectorInput>,
+  revokeConnector: z.strictObject({ orgId: id, agentId: id, toolkitSlug: z.string() }) satisfies z.ZodType<C.RevokeConnectorInput>,
+  approvalDrifts: z.strictObject({ orgId: id }),
+  search: z.strictObject({
+    orgId: id, employeeId: id, query: z.string(), entityTypes: z.array(z.enum(SEARCH_ENTITY_TYPES)).optional(), limit: z.number().optional(),
+  }) satisfies z.ZodType<C.SearchInput>,
+};
diff --git a/src/main/app/ipc-gate.ts b/src/main/app/ipc-gate.ts
new file mode 100644
index 00000000..25c5c8cc
--- /dev/null
+++ b/src/main/app/ipc-gate.ts
@@ -0,0 +1,35 @@
+import { ipcMain, type BrowserWindow, type IpcMainInvokeEvent } from "electron";
+import { z } from "zod";
+import { IPC_CHANNELS } from "../../shared/ipc";
+import { fail } from "../../shared/result";
+import { IPC_CONTRACTS, type InputOf, type InvokedMethod } from "./ipc-contracts";
+import { isAppPage } from "./window-security";
+
+/** Why a call is refused, or null: only the app's own window, from its top frame, on the app's own page may call. */
+export function senderRefusal(event: Pick<IpcMainInvokeEvent, "sender" | "senderFrame">, mainWindow: BrowserWindow, appPage: string): string | null {
+  if (event.sender.id !== mainWindow.webContents.id) return "the call did not come from the app window";
+  const frame = event.senderFrame;
+  if (!frame || frame.parent !== null) return "the call did not come from the app window's top frame";
+  return isAppPage(frame.url, appPage) ? null : `the calling page ${frame.url} is not the app's own`;
+}
+
+/** Registers an IPC call behind one gate: the caller is checked, then the input against the call's contract, before any service sees it. */
+export function createIpcGate(mainWindow: BrowserWindow, appPage: string) {
+  return <K extends InvokedMethod>(name: K, run: (input: InputOf<K>) => unknown): void => {
+    ipcMain.handle(IPC_CHANNELS[name], (event, raw: unknown) => {
+      const refusal = senderRefusal(event, mainWindow, appPage);
+      if (refusal) {
+        console.warn(`[ipc] refused ${name}: ${refusal}`);
+        return fail("forbidden_sender", refusal);
+      }
+      const contract: z.ZodType<InputOf<K>> = IPC_CONTRACTS[name];
+      const parsed = contract.safeParse(raw);
+      if (!parsed.success) {
+        const detail = z.prettifyError(parsed.error);
+        console.warn(`[ipc] invalid ${name} input: ${detail}`);
+        return fail("invalid_input", `${name}: ${detail}`);
+      }
+      return run(parsed.data);
+    });
+  };
+}
diff --git a/src/main/app/ipc-handlers.ts b/src/main/app/ipc-handlers.ts
index 24f308f2..1b782a22 100644
--- a/src/main/app/ipc-handlers.ts
+++ b/src/main/app/ipc-handlers.ts
@@ -1,4 +1,5 @@
-import { app, dialog, ipcMain, shell, type BrowserWindow } from "electron";
+import { createIpcGate } from "./ipc-gate";
+import { app, dialog, shell, type BrowserWindow } from "electron";
 import type { DatabaseConnection } from "../database/connection";
 import { IPC_CHANNELS } from "../../shared/ipc";
 import { fail, ok, type DesktopResult } from "../../shared/result";
@@ -41,6 +42,8 @@ import { stopAllRuns, stopRun } from "../services/run-control";
 export interface IpcDeps {
   connection: DatabaseConnection;
   mainWindow: BrowserWindow;
+  /** The app's own page (dev server URL or built index.html); calls from any other page are refused. */
+  appPage: string;
   artifactRoot: string;
   /** Bundled built-in skills source (repo folder in dev, resources when packaged). */
   builtinSkillsSource: string;
@@ -49,6 +52,8 @@ export interface IpcDeps {
 }
 
 export function registerIpcHandlers(deps: IpcDeps): void {
+  // Every call passes one gate: the caller must be the app's own page, and the input must match its contract.
+  const handle = createIpcGate(deps.mainWindow, deps.appPage);
   const snapshot = new SnapshotService(deps.connection.db);
   const organization = new OrganizationService(deps.connection.db);
   const approvals = new ApprovalService(deps.connection.db);
@@ -103,7 +108,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
   };
 
-  ipcMain.handle(IPC_CHANNELS.loadSnapshot, () => {
+  handle("loadSnapshot", () => {
     try {
       return ok(snapshot.load());
     } catch (error) {
@@ -111,7 +116,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
   });
 
-  ipcMain.handle(IPC_CHANNELS.bootstrapOnboarding, (_event, input) => {
+  handle("bootstrapOnboarding", (input) => {
     try {
       let summary: { orgId: string } | undefined;
       // Staging happens before the transaction (file mirroring), the import
@@ -132,9 +137,9 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
   });
 
-  ipcMain.handle(IPC_CHANNELS.createOrganization, (_event, input) => mutate(() => organization.createOrganization(input)));
-  ipcMain.handle(IPC_CHANNELS.setActiveOrganization, (_event, input) => mutate(() => organization.setActiveOrganization(input.orgId)));
-  ipcMain.handle(IPC_CHANNELS.setUiPreferences, (_event, input) => {
+  handle("createOrganization", (input) => mutate(() => organization.createOrganization(input)));
+  handle("setActiveOrganization", (input) => mutate(() => organization.setActiveOrganization(input.orgId)));
+  handle("setUiPreferences", (input) => {
     const before = snapshot.load().uiPreferences.language;
     const result = mutate(() => organization.updateUiPreferences(input));
     if (result.ok && result.data.uiPreferences.language !== before) {
@@ -147,25 +152,25 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
     return result;
   });
-  ipcMain.handle(IPC_CHANNELS.deleteOrganization, (_event, input) => mutate(() => organization.deleteOrganization(input.orgId)));
-  ipcMain.handle(IPC_CHANNELS.createAgent, (_event, input) => mutate(() => organization.createAgent(input)));
-  ipcMain.handle(IPC_CHANNELS.updateAgent, (_event, input) => mutate(() => organization.updateAgent(input)));
-  ipcMain.handle(IPC_CHANNELS.updateEmployeeProfile, (_event, input) => mutate(() => organization.updateEmployeeProfile(input)));
-  ipcMain.handle(IPC_CHANNELS.setAutonomousPaused, (_event, input) => mutate(() => {
+  handle("deleteOrganization", (input) => mutate(() => organization.deleteOrganization(input.orgId)));
+  handle("createAgent", (input) => mutate(() => organization.createAgent(input)));
+  handle("updateAgent", (input) => mutate(() => organization.updateAgent(input)));
+  handle("updateEmployeeProfile", (input) => mutate(() => organization.updateEmployeeProfile(input)));
+  handle("setAutonomousPaused", (input) => mutate(() => {
     organization.setAutonomousPaused(Boolean(input.paused));
     // Pausing also stops the sessions already running, not just future scheduling.
     if (input.paused) stopAllRuns();
   }));
-  ipcMain.handle(IPC_CHANNELS.stopRun, (_event, input) => mutate(() => {
+  handle("stopRun", (input) => mutate(() => {
     if (!stopRun(input.runId)) throw new Error("That run is not running anymore.");
   }));
-  ipcMain.handle(IPC_CHANNELS.setIntegrationKey, (_event, input) => mutate(() => integrationKeys.write(input.name, input.value)));
-  ipcMain.handle(IPC_CHANNELS.clearIntegrationKey, (_event, input) => mutate(() => integrationKeys.clear(input.name)));
-  ipcMain.handle(IPC_CHANNELS.createTask, (_event, input) => mutate(() => organization.createTask(input)));
-  ipcMain.handle(IPC_CHANNELS.updateTask, (_event, input) => mutate(() => organization.updateTask(input)));
-  ipcMain.handle(IPC_CHANNELS.deleteTask, (_event, input) => mutate(() => organization.deleteTask(input)));
-  ipcMain.handle(IPC_CHANNELS.updateTaskStatus, (_event, input) => mutate(() => organization.updateTaskStatus(input.orgId, input.taskId, input.status)));
-  ipcMain.handle(IPC_CHANNELS.runTask, async (_event, input) => {
+  handle("setIntegrationKey", (input) => mutate(() => integrationKeys.write(input.name, input.value)));
+  handle("clearIntegrationKey", (input) => mutate(() => integrationKeys.clear(input.name)));
+  handle("createTask", (input) => mutate(() => organization.createTask(input)));
+  handle("updateTask", (input) => mutate(() => organization.updateTask(input)));
+  handle("deleteTask", (input) => mutate(() => organization.deleteTask(input)));
+  handle("updateTaskStatus", (input) => mutate(() => organization.updateTaskStatus(input.orgId, input.taskId, input.status)));
+  handle("runTask", async (input) => {
     try {
       await taskExecution.runTask(input);
       notifyDataChanged();
@@ -175,44 +180,44 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("task_run_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.createGoal, (_event, input) => mutate(() => organization.createGoal(input)));
-  ipcMain.handle(IPC_CHANNELS.createProject, (_event, input) => mutate(() => organization.createProject(input)));
-  ipcMain.handle(IPC_CHANNELS.createWorkspace, (_event, input) => mutate(() => organization.createWorkspace(input)));
-  ipcMain.handle(IPC_CHANNELS.createDocument, (_event, input) => mutate(() => documents.create(input)));
-  ipcMain.handle(IPC_CHANNELS.updateDocument, (_event, input) => mutate(() => documents.update(input)));
-  ipcMain.handle(IPC_CHANNELS.deleteDocument, (_event, input) => mutate(() => documents.delete(input)));
-  ipcMain.handle(IPC_CHANNELS.createKnowledgeEntry, (_event, input) => mutate(() => knowledge.create(input)));
-  ipcMain.handle(IPC_CHANNELS.deleteKnowledgeEntry, (_event, input) => mutate(() => knowledge.delete(input)));
-  ipcMain.handle(IPC_CHANNELS.resumeGoal, (_event, input) => mutate(() => resumeGoal(deps.connection.db, organization, input.orgId, input.goalId)));
-  ipcMain.handle(IPC_CHANNELS.updateKnowledgeEntry, (_event, input) => mutate(() => knowledge.update(input)));
-  ipcMain.handle(IPC_CHANNELS.listDocumentVersions, (_event, input) => query("document_versions_failed", () =>
+  handle("createGoal", (input) => mutate(() => organization.createGoal(input)));
+  handle("createProject", (input) => mutate(() => organization.createProject(input)));
+  handle("createWorkspace", (input) => mutate(() => organization.createWorkspace(input)));
+  handle("createDocument", (input) => mutate(() => documents.create(input)));
+  handle("updateDocument", (input) => mutate(() => documents.update(input)));
+  handle("deleteDocument", (input) => mutate(() => documents.delete(input)));
+  handle("createKnowledgeEntry", (input) => mutate(() => knowledge.create(input)));
+  handle("deleteKnowledgeEntry", (input) => mutate(() => knowledge.delete(input)));
+  handle("resumeGoal", (input) => mutate(() => resumeGoal(deps.connection.db, organization, input.orgId, input.goalId)));
+  handle("updateKnowledgeEntry", (input) => mutate(() => knowledge.update(input)));
+  handle("listDocumentVersions", (input) => query("document_versions_failed", () =>
     documents.versions(input.orgId, input.documentId).map((v) => ({
       version: v.version, title: v.title, content: v.content, status: v.status,
       changedByType: v.changed_by_type, changedById: v.changed_by_id, reason: v.reason, createdAt: v.created_at,
     }))));
-  ipcMain.handle(IPC_CHANNELS.listKnowledgeRevisions, (_event, input) => query("knowledge_revisions_failed", () =>
+  handle("listKnowledgeRevisions", (input) => query("knowledge_revisions_failed", () =>
     knowledge.revisions(input.orgId, input.entryId).map((r) => ({
       revision: r.revision, topic: r.topic, category: r.category, content: r.content, importance: r.importance,
       changedByType: r.changed_by_type, changedById: r.changed_by_id, reason: r.reason, createdAt: r.created_at,
     }))));
-  ipcMain.handle(IPC_CHANNELS.createAutomationRule, (_event, input) => mutate(() => automation.create(input)));
-  ipcMain.handle(IPC_CHANNELS.updateAutomationRule, (_event, input) => mutate(() => automation.update(input)));
-  ipcMain.handle(IPC_CHANNELS.deleteAutomationRule, (_event, input) => mutate(() => automation.delete(input)));
-  ipcMain.handle(IPC_CHANNELS.createMeeting, (_event, input) => mutate(() => meetingService.create(input)));
-  ipcMain.handle(IPC_CHANNELS.deleteMeeting, (_event, input) => mutate(() => meetingService.delete(input)));
-  ipcMain.handle(IPC_CHANNELS.createSprint, (_event, input) => mutate(() => sprintService.create(input)));
-  ipcMain.handle(IPC_CHANNELS.deleteSprint, (_event, input) => mutate(() => sprintService.delete(input)));
-  ipcMain.handle(IPC_CHANNELS.createApproval, (_event, input) => mutate(() => approvals.create(input)));
-  ipcMain.handle(IPC_CHANNELS.decideApproval, (_event, input) => mutate(() => approvals.decide(input)));
-  ipcMain.handle(IPC_CHANNELS.syncEmployeeIdentity, (_event, input) => mutate(() => identityAccess.syncEmployeeIdentity(input)));
-  ipcMain.handle(IPC_CHANNELS.grantRole, (_event, input) => mutate(() => identityAccess.grantRole(input)));
-  ipcMain.handle(IPC_CHANNELS.createChatSpace, (_event, input) => mutate(() => chat.createSpace(input)));
-  ipcMain.handle(IPC_CHANNELS.sendMessage, (_event, input) => mutate(() => chat.sendMessage(input)));
-  ipcMain.handle(IPC_CHANNELS.editMessage, (_event, input) => mutate(() => chat.editMessage(input)));
-  ipcMain.handle(IPC_CHANNELS.deleteMessage, (_event, input) => mutate(() => chat.deleteMessage(input)));
-  ipcMain.handle(IPC_CHANNELS.markChatSpaceRead, (_event, input) => mutate(() => chat.markSpaceRead(input)));
-  ipcMain.handle(IPC_CHANNELS.saveProviderCredential, (_event, input) => mutate(() => providers.saveCredential(input)));
-  ipcMain.handle(IPC_CHANNELS.revokeProviderCredential, async (_event, input) => {
+  handle("createAutomationRule", (input) => mutate(() => automation.create(input)));
+  handle("updateAutomationRule", (input) => mutate(() => automation.update(input)));
+  handle("deleteAutomationRule", (input) => mutate(() => automation.delete(input)));
+  handle("createMeeting", (input) => mutate(() => meetingService.create(input)));
+  handle("deleteMeeting", (input) => mutate(() => meetingService.delete(input)));
+  handle("createSprint", (input) => mutate(() => sprintService.create(input)));
+  handle("deleteSprint", (input) => mutate(() => sprintService.delete(input)));
+  handle("createApproval", (input) => mutate(() => approvals.create(input)));
+  handle("decideApproval", (input) => mutate(() => approvals.decide(input)));
+  handle("syncEmployeeIdentity", (input) => mutate(() => identityAccess.syncEmployeeIdentity(input)));
+  handle("grantRole", (input) => mutate(() => identityAccess.grantRole(input)));
+  handle("createChatSpace", (input) => mutate(() => chat.createSpace(input)));
+  handle("sendMessage", (input) => mutate(() => chat.sendMessage(input)));
+  handle("editMessage", (input) => mutate(() => chat.editMessage(input)));
+  handle("deleteMessage", (input) => mutate(() => chat.deleteMessage(input)));
+  handle("markChatSpaceRead", (input) => mutate(() => chat.markSpaceRead(input)));
+  handle("saveProviderCredential", (input) => mutate(() => providers.saveCredential(input)));
+  handle("revokeProviderCredential", async (input) => {
     try {
       await providers.revokeCredential(input);
       notifyDataChanged();
@@ -223,10 +228,10 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("provider_revoke_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.updateProviderPolicy, (_event, input) => mutate(() => providers.updatePolicy(input)));
-  ipcMain.handle(IPC_CHANNELS.setProviderPrices, (_event, input) => mutate(() => providers.setPrices(input)));
-  ipcMain.handle(IPC_CHANNELS.setGoalAuditor, (_event, input) => mutate(() => setGoalAuditor(deps.connection.db, input)));
-  ipcMain.handle(IPC_CHANNELS.checkProviderHealth, async (_event, input) => {
+  handle("updateProviderPolicy", (input) => mutate(() => providers.updatePolicy(input)));
+  handle("setProviderPrices", (input) => mutate(() => providers.setPrices(input)));
+  handle("setGoalAuditor", (input) => mutate(() => setGoalAuditor(deps.connection.db, input)));
+  handle("checkProviderHealth", async (input) => {
     try {
       await providers.checkHealth(input.orgId, input.providerId);
       notifyDataChanged();
@@ -235,21 +240,21 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("provider_health_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.listProviderModels, async (_event, input) => {
+  handle("listProviderModels", async (input) => {
     try {
       return ok(await providers.listModels(input));
     } catch (error) {
       return fail("provider_models_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.checkProviderModel, async (_event, input) => {
+  handle("checkProviderModel", async (input) => {
     try {
       return ok(await providers.checkModel(input));
     } catch (error) {
       return fail("provider_model_check_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.startProviderOAuth, async (_event, input) => {
+  handle("startProviderOAuth", async (input) => {
     const emit = (event: Record<string, unknown>) =>
       deps.mainWindow.webContents.send(IPC_CHANNELS.rendererEvent, { type: "provider-oauth", providerKey: input.providerKey, ...event });
     try {
@@ -283,11 +288,11 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("provider_oauth_failed", message);
     }
   });
-  ipcMain.handle(IPC_CHANNELS.cancelProviderOAuth, (_event, input) => {
+  handle("cancelProviderOAuth", (input) => {
     providerOAuth.cancel(input.providerKey);
     return ok(null);
   });
-  ipcMain.handle(IPC_CHANNELS.openExternalUrl, async (_event, url: string) => {
+  handle("openExternalUrl", async (url) => {
     try {
       await shell.openExternal(normalizeExternalBrowserUrl(url));
       return ok(null);
@@ -295,7 +300,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("external_url_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.createProviderResponse, async (_event, input) => {
+  handle("createProviderResponse", async (input) => {
     try {
       await providers.createResponse(input);
       notifyDataChanged();
@@ -304,7 +309,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("provider_response_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.streamProviderResponse, async (_event, input) => {
+  handle("streamProviderResponse", async (input) => {
     try {
       await providers.streamResponse(input, (streamEvent) => {
         deps.mainWindow.webContents.send(IPC_CHANNELS.rendererEvent, { type: "provider-response-stream", event: streamEvent });
@@ -315,7 +320,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("provider_stream_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.cancelProviderResponse, async (_event, input) => {
+  handle("cancelProviderResponse", async (input) => {
     try {
       await providers.cancelResponse(input);
       notifyDataChanged();
@@ -324,12 +329,12 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       return fail("provider_cancel_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.createSocialAccount, (_event, input) => mutate(() => social.createAccount(input)));
-  ipcMain.handle(IPC_CHANNELS.createScheduledPost, (_event, input) => mutate(() => social.createScheduledPost(input)));
-  ipcMain.handle(IPC_CHANNELS.setScheduledPostState, (_event, input) => mutate(() => social.setScheduledPostState(input)));
-  ipcMain.handle(IPC_CHANNELS.setFilePinned, (_event, input) => mutate(() => files.setPinned(input.orgId, input.fileId, input.pinned)));
+  handle("createSocialAccount", (input) => mutate(() => social.createAccount(input)));
+  handle("createScheduledPost", (input) => mutate(() => social.createScheduledPost(input)));
+  handle("setScheduledPostState", (input) => mutate(() => social.setScheduledPostState(input)));
+  handle("setFilePinned", (input) => mutate(() => files.setPinned(input.orgId, input.fileId, input.pinned)));
 
-  ipcMain.handle(IPC_CHANNELS.launchSocialLogin, (_event, input) => {
+  handle("launchSocialLogin", (input) => {
     try {
       social.launchLoginWindow(input);
       return ok(null);
@@ -338,7 +343,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
   });
 
-  ipcMain.handle(IPC_CHANNELS.importFile, async (_event, input) => {
+  handle("importFile", async (input) => {
     try {
       const fileId = await files.importFile(input);
       if (fileId) notifyDataChanged();
@@ -348,7 +353,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
   });
 
-  ipcMain.handle(IPC_CHANNELS.openFile, async (_event, input) => {
+  handle("openFile", async (input) => {
     try {
       await files.openFile(input);
       return ok(null);
@@ -357,7 +362,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
   });
 
-  ipcMain.handle(IPC_CHANNELS.pickDirectory, async () => {
+  handle("pickDirectory", async () => {
     try {
       const result = await dialog.showOpenDialog(deps.mainWindow, { properties: ["openDirectory", "createDirectory"] });
       if (result.canceled || result.filePaths.length === 0) return ok(null);
@@ -367,22 +372,22 @@ export function registerIpcHandlers(deps: IpcDeps): void {
     }
   });
 
-  ipcMain.handle(IPC_CHANNELS.createMigrationReport, (_event, input) => mutate(() => migrations.createReport(input)));
-  ipcMain.handle(IPC_CHANNELS.createRollbackSnapshot, (_event, input) => mutate(() => rollback.createSnapshot(input)));
-  ipcMain.handle(IPC_CHANNELS.setRollbackSnapshotActive, (_event, input) => mutate(() => rollback.setActive(input)));
-  ipcMain.handle(IPC_CHANNELS.resolveMigrationReconciliation, (_event, input) => mutate(() => rollback.resolveReconciliationItem(input)));
-  ipcMain.handle(IPC_CHANNELS.setFeatureFlag, (_event, input) => mutate(() => operations.setFeatureFlag(input)));
-  ipcMain.handle(IPC_CHANNELS.runChaosDrill, (_event, input) => mutate(() => operations.runChaosDrill(input)));
-  ipcMain.handle(IPC_CHANNELS.runSdlcReview, (_event, input) => mutate(() => sdlc.runReview(input)));
-  ipcMain.handle(IPC_CHANNELS.runEvalSuite, (_event, input) => mutate(() => sdlc.runEvalSuite(input)));
-  ipcMain.handle(IPC_CHANNELS.setPrBotGate, (_event, input) => mutate(() => sdlc.setPrBotGate(input)));
-  ipcMain.handle(IPC_CHANNELS.createComplianceExport, (_event, input) => mutate(() => compliance.createExport(input)));
-  ipcMain.handle(IPC_CHANNELS.createAuditReplay, (_event, input) => mutate(() => audit.createThreadReplay(input)));
-  ipcMain.handle(IPC_CHANNELS.createLegalHold, (_event, input) => mutate(() => compliance.createLegalHold(input)));
-  ipcMain.handle(IPC_CHANNELS.setLegalHoldState, (_event, input) => mutate(() => compliance.setLegalHoldState(input)));
-  ipcMain.handle(IPC_CHANNELS.createRetentionFreeze, (_event, input) => mutate(() => compliance.createRetentionFreeze(input)));
-  ipcMain.handle(IPC_CHANNELS.setRetentionFreezeState, (_event, input) => mutate(() => compliance.setRetentionFreezeState(input)));
-  ipcMain.handle(IPC_CHANNELS.search, (_event, input) => {
+  handle("createMigrationReport", (input) => mutate(() => migrations.createReport(input)));
+  handle("createRollbackSnapshot", (input) => mutate(() => rollback.createSnapshot(input)));
+  handle("setRollbackSnapshotActive", (input) => mutate(() => rollback.setActive(input)));
+  handle("resolveMigrationReconciliation", (input) => mutate(() => rollback.resolveReconciliationItem(input)));
+  handle("setFeatureFlag", (input) => mutate(() => operations.setFeatureFlag(input)));
+  handle("runChaosDrill", (input) => mutate(() => operations.runChaosDrill(input)));
+  handle("runSdlcReview", (input) => mutate(() => sdlc.runReview(input)));
+  handle("runEvalSuite", (input) => mutate(() => sdlc.runEvalSuite(input)));
+  handle("setPrBotGate", (input) => mutate(() => sdlc.setPrBotGate(input)));
+  handle("createComplianceExport", (input) => mutate(() => compliance.createExport(input)));
+  handle("createAuditReplay", (input) => mutate(() => audit.createThreadReplay(input)));
+  handle("createLegalHold", (input) => mutate(() => compliance.createLegalHold(input)));
+  handle("setLegalHoldState", (input) => mutate(() => compliance.setLegalHoldState(input)));
+  handle("createRetentionFreeze", (input) => mutate(() => compliance.createRetentionFreeze(input)));
+  handle("setRetentionFreezeState", (input) => mutate(() => compliance.setRetentionFreezeState(input)));
+  handle("search", (input) => {
     try {
       return ok(search.search(input));
     } catch (error) {
@@ -392,14 +397,14 @@ export function registerIpcHandlers(deps: IpcDeps): void {
 
   const composioConnections = new ComposioConnectionService(deps.connection.db, integrationKeys);
 
-  ipcMain.handle(IPC_CHANNELS.listConnectorCatalog, async () => {
+  handle("listConnectorCatalog", async () => {
     try {
       return ok(await composioConnections.listCatalog());
     } catch (error) {
       return fail("composio_catalog_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.connectComposioToolkit, async (_event, input) => {
+  handle("connectComposioToolkit", async (input) => {
     try {
       return ok(await composioConnections.connectToolkit(input.orgId, input.toolkitSlug, input.label));
     } catch (error) {
@@ -409,7 +414,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       notifyDataChanged();
     }
   });
-  ipcMain.handle(IPC_CHANNELS.disconnectComposioToolkit, async (_event, input) => {
+  handle("disconnectComposioToolkit", async (input) => {
     try {
       await composioConnections.disconnectToolkit(input.orgId, input.toolkitSlug, input.label);
       return ok(snapshot.load());
@@ -419,16 +424,16 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       notifyDataChanged();
     }
   });
-  ipcMain.handle(IPC_CHANNELS.grantConnector, (_event, input) => mutate(() => new ConnectorGrantsService(deps.connection.db).grantFromBoard(input)));
-  ipcMain.handle(IPC_CHANNELS.approvalDrifts, (_event, input) => {
+  handle("grantConnector", (input) => mutate(() => new ConnectorGrantsService(deps.connection.db).grantFromBoard(input)));
+  handle("approvalDrifts", (input) => {
     try {
       return ok(approvalDrifts(deps.connection.db, input.orgId));
     } catch (error) {
       return fail("approval_drift_failed", error instanceof Error ? error.message : String(error));
     }
   });
-  ipcMain.handle(IPC_CHANNELS.revokeConnector, (_event, input) => mutate(() => new ConnectorGrantsService(deps.connection.db).revoke(input)));
-  ipcMain.handle(IPC_CHANNELS.refreshComposioAccounts, async (_event, input) => {
+  handle("revokeConnector", (input) => mutate(() => new ConnectorGrantsService(deps.connection.db).revoke(input)));
+  handle("refreshComposioAccounts", async (input) => {
     try {
       await composioConnections.refreshAccounts(input.orgId);
       return ok(snapshot.load());
@@ -438,7 +443,7 @@ export function registerIpcHandlers(deps: IpcDeps): void {
       notifyDataChanged();
     }
   });
-  ipcMain.handle(IPC_CHANNELS.windowMinimize, () => deps.mainWindow.minimize());
-  ipcMain.handle(IPC_CHANNELS.windowMaximize, () => deps.mainWindow.isMaximized() ? deps.mainWindow.unmaximize() : deps.mainWindow.maximize());
-  ipcMain.handle(IPC_CHANNELS.windowClose, () => deps.mainWindow.close());
+  handle("windowMinimize", () => deps.mainWindow.minimize());
+  handle("windowMaximize", () => deps.mainWindow.isMaximized() ? deps.mainWindow.unmaximize() : deps.mainWindow.maximize());
+  handle("windowClose", () => deps.mainWindow.close());
 }
diff --git a/src/main/app/window-security.ts b/src/main/app/window-security.ts
index 7911e18f..c308232f 100644
--- a/src/main/app/window-security.ts
+++ b/src/main/app/window-security.ts
@@ -1,10 +1,21 @@
 import type { BrowserWindow } from "electron";
+import { fileURLToPath } from "node:url";
 
-export function attachMainWindowSecurity(win: BrowserWindow, devServerOrigin: string | null): void {
+/** Whether a URL is the app's own page: the exact index.html it was built with, or any route of the dev server it is served by. */
+export function isAppPage(url: string, appPage: string): boolean {
+  if (!URL.canParse(url)) return false;
+  const target = new URL(url);
+  const page = new URL(appPage);
+  if (page.protocol !== "file:") return target.origin === page.origin;
+  if (target.protocol !== "file:") return false;
+  const path = (value: URL): string => (process.platform === "win32" ? fileURLToPath(value).toLowerCase() : fileURLToPath(value));
+  return path(target) === path(page);
+}
+
+export function attachMainWindowSecurity(win: BrowserWindow, appPage: string): void {
   win.webContents.setWindowOpenHandler(() => ({ action: "deny" }));
   const blockNavigation = (event: Electron.Event, url: string): void => {
-    if (devServerOrigin && url.startsWith(devServerOrigin)) return;
-    if (url.startsWith("file://")) return;
+    if (isAppPage(url, appPage)) return;
     event.preventDefault();
   };
   win.webContents.on("will-navigate", blockNavigation);
diff --git a/src/main/index.ts b/src/main/index.ts
index 02398236..7dca83f4 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -3,7 +3,7 @@ import { dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import type { DatabaseSync } from "node:sqlite";
 import { DatabaseConnection } from "./database/connection";
-import { createMainWindow } from "./app/create-window";
+import { appPageUrl, createMainWindow } from "./app/create-window";
 import { registerIpcHandlers } from "./app/ipc-handlers";
 import { builtinSkillsSourceOverride, importStagedSkills, stageBuiltinSkillsLibrary } from "./services/builtin-skills";
 import { ensureCeoDirectSpace } from "./services/ceo-direct-space";
@@ -44,6 +44,7 @@ if (!app.requestSingleInstanceLock()) {
     registerIpcHandlers({
       connection,
       mainWindow: win,
+      appPage: appPageUrl({ devServerUrl: process.env.ELECTRON_RENDERER_URL, rendererDist: join(__dirname, "../renderer") }),
       artifactRoot: join(profileDir, "artifacts"),
       builtinSkillsSource,
       builtinSkillsLibrary,
diff --git a/tests/unit/ipc-gate.test.ts b/tests/unit/ipc-gate.test.ts
new file mode 100644
index 00000000..9ef29756
--- /dev/null
+++ b/tests/unit/ipc-gate.test.ts
@@ -0,0 +1,43 @@
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { pathToFileURL } from "node:url";
+import { describe, expect, test, vi } from "vitest";
+
+const registered = new Map<string, (event: unknown, raw: unknown) => unknown>();
+vi.mock("electron", () => ({
+  ipcMain: { handle: (channel: string, listener: (event: unknown, raw: unknown) => unknown) => registered.set(channel, listener) },
+}));
+
+const { createIpcGate } = await import("../../src/main/app/ipc-gate");
+const { IPC_CHANNELS } = await import("../../src/shared/ipc");
+
+const mainWindow = { webContents: { id: 1 } } as unknown as Electron.BrowserWindow;
+const appPage = pathToFileURL(join(tmpdir(), "app", "index.html")).href;
+const fromApp = { sender: { id: 1 }, senderFrame: { parent: null, url: `${appPage}#/work` } };
+
+describe("the IPC gate", () => {
+  test("only the app's own page reaches a service, and only with input that matches the call's contract", () => {
+    const handle = createIpcGate(mainWindow, appPage);
+    const devHandle = createIpcGate(mainWindow, "http://localhost:5173/");
+    const run = vi.fn((input: unknown) => ({ ok: true, data: input }));
+    handle("stopRun", run);
+    const call = (event: unknown, raw: unknown) => registered.get(IPC_CHANNELS.stopRun)!(event, raw);
+
+    expect(call({ ...fromApp, sender: { id: 2 } }, { runId: "run_1" })).toMatchObject({ ok: false, error: { code: "forbidden_sender" } });
+    expect(call({ ...fromApp, senderFrame: { parent: {}, url: "file:///C:/app/index.html" } }, { runId: "run_1" })).toMatchObject({ ok: false, error: { code: "forbidden_sender" } });
+    expect(call({ ...fromApp, senderFrame: { parent: null, url: "https://evil.example/" } }, { runId: "run_1" })).toMatchObject({ ok: false, error: { code: "forbidden_sender" } });
+    // Another local page is not the app's own, even though it is a file too.
+    const untrusted = pathToFileURL(join(tmpdir(), "Downloads", "untrusted.html")).href;
+    expect(call({ ...fromApp, senderFrame: { parent: null, url: untrusted } }, { runId: "run_1" })).toMatchObject({ ok: false, error: { code: "forbidden_sender" } });
+    expect(call(fromApp, { runId: 7 })).toMatchObject({ ok: false, error: { code: "invalid_input" } });
+    expect(call(fromApp, { runId: "run_1", extra: true })).toMatchObject({ ok: false, error: { code: "invalid_input" } });
+    expect(run).not.toHaveBeenCalled();
+
+    expect(call(fromApp, { runId: "run_1" })).toEqual({ ok: true, data: { runId: "run_1" } });
+    expect(run).toHaveBeenCalledTimes(1);
+    // In development the dev server's origin is the app's page.
+    devHandle("stopRun", run);
+    expect(call({ ...fromApp, senderFrame: { parent: null, url: "http://localhost:5173/#/work" } }, { runId: "run_2" })).toEqual({ ok: true, data: { runId: "run_2" } });
+    expect(call({ ...fromApp, senderFrame: { parent: null, url: appPage } }, { runId: "run_3" })).toMatchObject({ ok: false, error: { code: "forbidden_sender" } });
+  });
+});