diff --git a/apps/cron/20260201-000000/index.tsx b/apps/cron/20260201-000000/index.tsx
index b3fa2cd..f8640b8 100644
--- a/apps/cron/20260201-000000/index.tsx
+++ b/apps/cron/20260201-000000/index.tsx
@@ -4,8 +4,8 @@ import { baseStyles, ToolScript, theme } from '@because/toes/tools'
 import { discoverCronJobs } from './lib/discovery'
 import { scheduleJob, stopJob } from './lib/scheduler'
 import { executeJob } from './lib/executor'
-import { setJobs, getJob, getAllJobs, broadcast } from './lib/state'
-import { SCHEDULES, type CronJob } from './lib/schedules'
+import { setJobs, setInvalidJobs, getJob, getAllJobs, getInvalidJobs, broadcast } from './lib/state'
+import { SCHEDULES, type CronJob, type InvalidJob } from './lib/schedules'
 import type { Child } from 'hono/jsx'
 import { join } from 'path'
 import { mkdir, writeFile } from 'fs/promises'
@@ -92,6 +92,24 @@ const EmptyState = define('EmptyState', {
   color: theme('colors-textMuted'),
 })
 
+const InvalidItem = define('InvalidItem', {
+  padding: '12px 15px',
+  borderBottom: `1px solid ${theme('colors-border')}`,
+  display: 'flex',
+  alignItems: 'center',
+  gap: '15px',
+  opacity: 0.7,
+  states: {
+    ':last-child': { borderBottom: 'none' },
+  },
+})
+
+const ErrorText = define('ErrorText', {
+  fontSize: '12px',
+  color: theme('colors-error'),
+  flex: 1,
+})
+
 const ActionRow = define('ActionRow', {
   display: 'flex',
   justifyContent: 'flex-end',
@@ -226,19 +244,24 @@ app.get('/styles.css', c => c.text(baseStyles + stylesToCSS(), 200, {
 app.get('/', async c => {
   const appFilter = c.req.query('app')
   let jobs = getAllJobs()
+  let invalid = getInvalidJobs()
 
   if (appFilter) {
     jobs = jobs.filter(j => j.app === appFilter)
+    invalid = invalid.filter(j => j.app === appFilter)
   }
 
   jobs.sort((a, b) => a.id.localeCompare(b.id))
+  invalid.sort((a, b) => a.id.localeCompare(b.id))
+
+  const hasAny = jobs.length > 0 || invalid.length > 0
 
   return c.html(
     <Layout title="Cron Jobs">
       <ActionRow>
         <NewButton href={`/new?app=${appFilter || ''}`}>New Job</NewButton>
       </ActionRow>
-      {jobs.length === 0 ? (
+      {!hasAny ? (
         <EmptyState>
           No cron jobs found.
           <br />
@@ -260,6 +283,13 @@ app.get('/', async c => {
               </form>
             </JobItem>
           ))}
+          {invalid.map(job => (
+            <InvalidItem>
+              <StatusDot style={{ backgroundColor: theme('colors-error') }} />
+              <JobName>{job.app}/{job.name}</JobName>
+              <ErrorText>{job.error}</ErrorText>
+            </InvalidItem>
+          ))}
         </JobList>
       )}
     </Layout>
@@ -336,8 +366,9 @@ export default async function() {
   console.log(`[cron] Created ${appName}:${name}`)
 
   // Trigger rediscovery
-  const jobs = await discoverCronJobs()
+  const { jobs, invalid } = await discoverCronJobs()
   setJobs(jobs)
+  setInvalidJobs(invalid)
   for (const job of jobs) {
     if (job.id === `${appName}:${name}`) {
       scheduleJob(job, broadcast)
@@ -364,21 +395,26 @@ app.post('/run/:app/:name', async c => {
 
 // Initialize
 async function init() {
-  const jobs = await discoverCronJobs()
+  const { jobs, invalid } = await discoverCronJobs()
   setJobs(jobs)
-  console.log(`[cron] Discovered ${jobs.length} jobs`)
+  setInvalidJobs(invalid)
+  console.log(`[cron] Discovered ${jobs.length} jobs, ${invalid.length} invalid`)
 
   for (const job of jobs) {
     scheduleJob(job, broadcast)
     console.log(`[cron] Scheduled ${job.id}: ${job.schedule} (${job.cronExpr})`)
   }
+
+  for (const job of invalid) {
+    console.log(`[cron] Invalid ${job.id}: ${job.error}`)
+  }
 }
 
 // Watch for cron file changes
 let debounceTimer: Timer | null = null
 
 async function rediscover() {
-  const jobs = await discoverCronJobs()
+  const { jobs, invalid } = await discoverCronJobs()
   const existing = getAllJobs()
 
   // Stop removed jobs
@@ -407,6 +443,7 @@ async function rediscover() {
   }
 
   setJobs(jobs)
+  setInvalidJobs(invalid)
 }
 
 watch(APPS_DIR, { recursive: true }, (_event, filename) => {
diff --git a/apps/cron/20260201-000000/lib/discovery.ts b/apps/cron/20260201-000000/lib/discovery.ts
index 3cb268f..c540e6a 100644
--- a/apps/cron/20260201-000000/lib/discovery.ts
+++ b/apps/cron/20260201-000000/lib/discovery.ts
@@ -1,7 +1,7 @@
 import { readdir, readFile } from 'fs/promises'
 import { existsSync } from 'fs'
 import { join } from 'path'
-import { isValidSchedule, toCronExpr, type CronJob, type Schedule } from './schedules'
+import { isValidSchedule, toCronExpr, type CronJob, type InvalidJob, type Schedule } from './schedules'
 
 const APPS_DIR = process.env.APPS_DIR!
 
@@ -22,8 +22,14 @@ export async function getApps(): Promise<string[]> {
   return apps.sort()
 }
 
-export async function discoverCronJobs(): Promise<CronJob[]> {
+export type DiscoveryResult = {
+  jobs: CronJob[]
+  invalid: InvalidJob[]
+}
+
+export async function discoverCronJobs(): Promise<DiscoveryResult> {
   const jobs: CronJob[] = []
+  const invalid: InvalidJob[] = []
   const apps = await readdir(APPS_DIR, { withFileTypes: true })
 
   for (const app of apps) {
@@ -38,25 +44,26 @@ export async function discoverCronJobs(): Promise<CronJob[]> {
 
       const filePath = join(cronDir, file)
       const name = file.replace(/\.ts$/, '')
+      const id = `${app.name}:${name}`
 
       try {
         const source = await readFile(filePath, 'utf-8')
         const match = source.match(SCHEDULE_RE)
 
         if (!match) {
-          console.error(`No schedule export found in ${filePath}`)
+          invalid.push({ id, app: app.name, name, file: filePath, error: 'Missing schedule export' })
           continue
         }
 
         const schedule = match[1] as Schedule
 
         if (!isValidSchedule(schedule)) {
-          console.error(`Invalid schedule in ${filePath}: ${schedule}`)
+          invalid.push({ id, app: app.name, name, file: filePath, error: `Invalid schedule: "${match[1]}"` })
           continue
         }
 
         jobs.push({
-          id: `${app.name}:${name}`,
+          id,
           app: app.name,
           name,
           file: filePath,
@@ -65,10 +72,11 @@ export async function discoverCronJobs(): Promise<CronJob[]> {
           state: 'idle',
         })
       } catch (e) {
-        console.error(`Failed to load cron file ${filePath}:`, e)
+        const msg = e instanceof Error ? e.message : String(e)
+        invalid.push({ id, app: app.name, name, file: filePath, error: msg })
       }
     }
   }
 
-  return jobs
+  return { jobs, invalid }
 }
diff --git a/apps/cron/20260201-000000/lib/schedules.ts b/apps/cron/20260201-000000/lib/schedules.ts
index 20a3456..6d995ca 100644
--- a/apps/cron/20260201-000000/lib/schedules.ts
+++ b/apps/cron/20260201-000000/lib/schedules.ts
@@ -20,6 +20,14 @@ export type CronJob = {
   nextRun?: number
 }
 
+export type InvalidJob = {
+  id: string
+  app: string
+  name: string
+  file: string
+  error: string
+}
+
 export const SCHEDULES = [
   '1 minute',
   '5 minutes',
diff --git a/apps/cron/20260201-000000/lib/state.ts b/apps/cron/20260201-000000/lib/state.ts
index 214d502..965aac3 100644
--- a/apps/cron/20260201-000000/lib/state.ts
+++ b/apps/cron/20260201-000000/lib/state.ts
@@ -1,8 +1,10 @@
-import type { CronJob } from './schedules'
+import type { CronJob, InvalidJob } from './schedules'
 
 const jobs = new Map<string, CronJob>()
 const listeners = new Set<() => void>()
 
+let invalidJobs: InvalidJob[] = []
+
 export function setJobs(newJobs: CronJob[]) {
   jobs.clear()
   for (const job of newJobs) {
@@ -11,6 +13,10 @@ export function setJobs(newJobs: CronJob[]) {
   broadcast()
 }
 
+export function setInvalidJobs(newInvalid: InvalidJob[]) {
+  invalidJobs = newInvalid
+}
+
 export function getJob(id: string): CronJob | undefined {
   return jobs.get(id)
 }
@@ -19,6 +25,10 @@ export function getAllJobs(): CronJob[] {
   return Array.from(jobs.values())
 }
 
+export function getInvalidJobs(): InvalidJob[] {
+  return invalidJobs
+}
+
 export function broadcast() {
   listeners.forEach(cb => cb())
 }