diff --git a/apps/journal/app/lib/demo-bot.server.ts b/apps/journal/app/lib/demo-bot.server.ts
index 9b22296..8fa1cf6 100644
--- a/apps/journal/app/lib/demo-bot.server.ts
+++ b/apps/journal/app/lib/demo-bot.server.ts
@@ -51,14 +51,14 @@ const PersonaSchema = z
     for (const loc of p.locales) {
       if (!p.content.names[loc]) {
         ctx.addIssue({
-          code: z.ZodIssueCode.custom,
+          code: "custom",
           path: ["content", "names", loc],
           message: `missing name pool for declared locale '${loc}'`,
         });
       }
       if (!p.content.descriptions[loc]) {
         ctx.addIssue({
-          code: z.ZodIssueCode.custom,
+          code: "custom",
           path: ["content", "descriptions", loc],
           message: `missing description pool for declared locale '${loc}'`,
         });
diff --git a/packages/api/src/activities.ts b/packages/api/src/activities.ts
index 479fbc6..e4f2420 100644
--- a/packages/api/src/activities.ts
+++ b/packages/api/src/activities.ts
@@ -2,24 +2,24 @@ import { z } from "zod";
 
 /** Activity summary for list views */
 export const ActivitySummarySchema = z.object({
-  id: z.string().uuid(),
+  id: z.uuid(),
   name: z.string(),
   description: z.string(),
-  routeId: z.string().uuid().nullable(),
+  routeId: z.uuid().nullable(),
   routeName: z.string().nullable(),
   distance: z.number().nullable(),
   duration: z.number().nullable(),
   elevationGain: z.number().nullable(),
   elevationLoss: z.number().nullable(),
-  startedAt: z.string().datetime().nullable(),
+  startedAt: z.iso.datetime().nullable(),
   geojson: z.string().nullable(),
-  createdAt: z.string().datetime(),
+  createdAt: z.iso.datetime(),
 });
 
 /** Full activity detail */
 export const ActivityDetailSchema = ActivitySummarySchema.extend({
   gpx: z.string().nullable(),
-  photos: z.array(z.string().url()),
+  photos: z.array(z.url()),
 });
 
 /** Paginated activity list response */
@@ -33,8 +33,8 @@ export const CreateActivityRequestSchema = z.object({
   name: z.string().min(1).max(200),
   description: z.string().max(5000).default(""),
   gpx: z.string().optional(),
-  routeId: z.string().uuid().optional(),
-  startedAt: z.string().datetime().optional(),
+  routeId: z.uuid().optional(),
+  startedAt: z.iso.datetime().optional(),
   duration: z.number().optional(),
   distance: z.number().optional(),
 });
diff --git a/packages/api/src/auth.ts b/packages/api/src/auth.ts
index 8440738..3f556f1 100644
--- a/packages/api/src/auth.ts
+++ b/packages/api/src/auth.ts
@@ -20,8 +20,8 @@ export const TokenResponseSchema = z.object({
 export const DeviceSchema = z.object({
   id: z.string(),
   deviceName: z.string().nullable(),
-  lastActiveAt: z.string().datetime(),
-  createdAt: z.string().datetime(),
+  lastActiveAt: z.iso.datetime(),
+  createdAt: z.iso.datetime(),
   isCurrent: z.boolean(),
 });
 
diff --git a/packages/api/src/discovery.ts b/packages/api/src/discovery.ts
index 9680a9a..2f1ff2a 100644
--- a/packages/api/src/discovery.ts
+++ b/packages/api/src/discovery.ts
@@ -3,8 +3,8 @@ import { z } from "zod";
 export const DiscoveryResponseSchema = z.object({
   apiVersion: z.string(),
   instanceName: z.string(),
-  apiBaseUrl: z.string().url(),
-  tileUrl: z.string().url().optional(),
+  apiBaseUrl: z.url(),
+  tileUrl: z.url().optional(),
 });
 
 export type DiscoveryResponse = z.infer<typeof DiscoveryResponseSchema>;
diff --git a/packages/api/src/routes.ts b/packages/api/src/routes.ts
index b9e64e5..dc83071 100644
--- a/packages/api/src/routes.ts
+++ b/packages/api/src/routes.ts
@@ -2,7 +2,7 @@ import { z } from "zod";
 
 /** Route summary for list views */
 export const RouteSummarySchema = z.object({
-  id: z.string().uuid(),
+  id: z.uuid(),
   name: z.string(),
   description: z.string(),
   distance: z.number().nullable(),
@@ -11,15 +11,15 @@ export const RouteSummarySchema = z.object({
   routingProfile: z.string().nullable(),
   dayBreaks: z.array(z.number()),
   geojson: z.string().nullable(),
-  createdAt: z.string().datetime(),
-  updatedAt: z.string().datetime(),
+  createdAt: z.iso.datetime(),
+  updatedAt: z.iso.datetime(),
 });
 
 /** Route version info */
 export const RouteVersionSchema = z.object({
   version: z.number(),
   changeDescription: z.string().nullable(),
-  createdAt: z.string().datetime(),
+  createdAt: z.iso.datetime(),
 });
 
 /** Full route detail */
diff --git a/packages/api/src/uploads.ts b/packages/api/src/uploads.ts
index 98f8927..37da2f1 100644
--- a/packages/api/src/uploads.ts
+++ b/packages/api/src/uploads.ts
@@ -4,13 +4,13 @@ export const PresignedUploadRequestSchema = z.object({
   filename: z.string(),
   contentType: z.string(),
   resourceType: z.enum(["route", "activity"]),
-  resourceId: z.string().uuid(),
+  resourceId: z.uuid(),
 });
 
 export const PresignedUploadResponseSchema = z.object({
-  uploadUrl: z.string().url(),
+  uploadUrl: z.url(),
   storageKey: z.string(),
-  expiresAt: z.string().datetime(),
+  expiresAt: z.iso.datetime(),
 });
 
 export type PresignedUploadRequest = z.infer<typeof PresignedUploadRequestSchema>;