diff --git a/docs/nostr-event-schemas.md b/docs/nostr-event-schemas.md
index 5b58df44..51a9c2f3 100644
--- a/docs/nostr-event-schemas.md
+++ b/docs/nostr-event-schemas.md
@@ -7,6 +7,19 @@ no longer requires hunting through the codebase. It also exposes helpers for
 building events and for overriding the schema at runtime when you need to
 experiment.
 
+## Validation
+
+To verify that event builders produce spec-compliant events, run the validation script:
+
+```bash
+node scripts/agent/validate-events.mjs
+```
+
+This script generates example events for all defined builders and checks them against their schemas, ensuring:
+- Correct kind
+- Presence of required tags (topic, identifier, etc.)
+- Correct content format (JSON vs text vs empty)
+
 ## Runtime helpers
 
 ```js
diff --git a/js/nostrEventSchemas.js b/js/nostrEventSchemas.js
index 117ce77f..09eae359 100644
--- a/js/nostrEventSchemas.js
+++ b/js/nostrEventSchemas.js
@@ -891,7 +891,7 @@ export function buildRepostEvent(params) {
     if (normalizedEventRelay) {
       tags.push(["e", normalizedEventId, normalizedEventRelay]);
     } else {
-      tags.push(["e", normalizedEventId]);
+      throw new Error("missing-event-relay");
     }
   }
 
diff --git a/scripts/agent/validate-events.mjs b/scripts/agent/validate-events.mjs
new file mode 100644
index 00000000..65a695d9
--- /dev/null
+++ b/scripts/agent/validate-events.mjs
@@ -0,0 +1,350 @@
+
+import {
+  getNostrEventSchema,
+  NOTE_TYPES,
+  buildVideoPostEvent,
+  buildVideoMirrorEvent,
+  buildRepostEvent,
+  buildRelayListEvent,
+  buildDmRelayListEvent,
+  buildProfileMetadataEvent,
+  buildMuteListEvent,
+  buildDeletionEvent,
+  buildLegacyDirectMessageEvent,
+  buildDmAttachmentEvent,
+  buildDmReadReceiptEvent,
+  buildDmTypingIndicatorEvent,
+  buildViewEvent,
+  buildZapRequestEvent,
+  buildReactionEvent,
+  buildCommentEvent,
+  buildWatchHistoryEvent,
+  buildSubscriptionListEvent,
+  buildBlockListEvent,
+  buildHashtagPreferenceEvent,
+  buildAdminListEvent
+} from '../../js/nostrEventSchemas.js';
+
+const COLORS = {
+  RESET: "\x1b[0m",
+  RED: "\x1b[31m",
+  GREEN: "\x1b[32m",
+  YELLOW: "\x1b[33m",
+  BLUE: "\x1b[34m",
+};
+
+let errorCount = 0;
+let successCount = 0;
+
+function logError(msg) {
+  console.error(`${COLORS.RED}[FAIL] ${msg}${COLORS.RESET}`);
+  errorCount++;
+}
+
+function logSuccess(msg) {
+  console.log(`${COLORS.GREEN}[PASS] ${msg}${COLORS.RESET}`);
+  successCount++;
+}
+
+function logInfo(msg) {
+  console.log(`${COLORS.BLUE}[INFO] ${msg}${COLORS.RESET}`);
+}
+
+function hasTag(tags, tagName, tagValue = null) {
+  if (!Array.isArray(tags)) return false;
+  return tags.some(
+    (tag) =>
+      Array.isArray(tag) &&
+      tag[0] === tagName &&
+      (tagValue === null || tag[1] === tagValue)
+  );
+}
+
+function validateEvent(type, event, description) {
+  const schema = getNostrEventSchema(type);
+  if (!schema) {
+    logError(`${description}: No schema found for type ${type}`);
+    return;
+  }
+
+  let valid = true;
+  const errors = [];
+
+  // Validate Kind
+  if (event.kind !== schema.kind) {
+    errors.push(`Kind mismatch: expected ${schema.kind}, got ${event.kind}`);
+    valid = false;
+  }
+
+  // Validate Topic Tag
+  if (schema.topicTag) {
+    if (!hasTag(event.tags, schema.topicTag.name, schema.topicTag.value)) {
+      errors.push(`Missing topic tag: ${schema.topicTag.name}=${schema.topicTag.value}`);
+      valid = false;
+    }
+  }
+
+  // Validate Identifier Tag
+  if (schema.identifierTag) {
+    const expectedValue = schema.identifierTag.value;
+    if (expectedValue) {
+        if (!hasTag(event.tags, schema.identifierTag.name, expectedValue)) {
+            errors.push(`Missing identifier tag: ${schema.identifierTag.name}=${expectedValue}`);
+            valid = false;
+        }
+    } else {
+        // If value is not fixed in schema, just check tag name presence if it's supposed to be there.
+        // Usually d-tags are present.
+        if (!hasTag(event.tags, schema.identifierTag.name)) {
+             errors.push(`Missing identifier tag: ${schema.identifierTag.name}`);
+             valid = false;
+        }
+    }
+  }
+
+  // Validate Append Tags
+  if (schema.appendTags) {
+    schema.appendTags.forEach((appendTag) => {
+      if (Array.isArray(appendTag) && appendTag.length >= 2) {
+        const tagName = appendTag[0];
+        const tagValue = appendTag[1];
+        if (!hasTag(event.tags, tagName, tagValue)) {
+          errors.push(`Missing append tag: ${tagName}=${tagValue}`);
+          valid = false;
+        }
+      }
+    });
+  }
+
+  // Validate Content Format
+  if (schema.content) {
+    if (schema.content.format === "json") {
+      try {
+        JSON.parse(event.content);
+      } catch (e) {
+        errors.push(`Content is not valid JSON`);
+        valid = false;
+      }
+    } else if (schema.content.format === "empty") {
+      if (event.content !== "") {
+        errors.push(`Content should be empty, got: "${event.content}"`);
+        valid = false;
+      }
+    }
+  }
+
+  if (valid) {
+    logSuccess(`${description}`);
+  } else {
+    logError(`${description}`);
+    errors.forEach(e => console.error(`  - ${e}`));
+    console.log("  Event:", JSON.stringify(event, null, 2));
+  }
+}
+
+async function main() {
+  logInfo("Starting Event Validation...");
+
+  // 1. VIDEO_POST
+  validateEvent(NOTE_TYPES.VIDEO_POST, buildVideoPostEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    dTagValue: "video-id",
+    content: { title: "Test Video", videoRootId: "root-id" }
+  }), "buildVideoPostEvent (standard)");
+
+  validateEvent(NOTE_TYPES.VIDEO_POST, buildVideoPostEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    dTagValue: "video-id-minimal",
+    content: { version: 1, title: "Minimal", videoRootId: "root" }
+  }), "buildVideoPostEvent (minimal)");
+
+  // 2. VIDEO_MIRROR
+  validateEvent(NOTE_TYPES.VIDEO_MIRROR, buildVideoMirrorEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    content: "Alt text"
+  }), "buildVideoMirrorEvent");
+
+  // 3. REPOST
+  validateEvent(NOTE_TYPES.REPOST, buildRepostEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    eventId: "hex-id",
+    eventRelay: "wss://relay.example.com",
+    targetKind: 1,
+    serializedEvent: JSON.stringify({ kind: 1, content: "test" })
+  }), "buildRepostEvent (event pointer)");
+
+  // 4. RELAY_LIST
+  validateEvent(NOTE_TYPES.RELAY_LIST, buildRelayListEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    relays: ["wss://relay.example.com"]
+  }), "buildRelayListEvent");
+
+  // 5. DM_RELAY_LIST
+  validateEvent(NOTE_TYPES.DM_RELAY_LIST, buildDmRelayListEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    relays: ["wss://relay.example.com"]
+  }), "buildDmRelayListEvent");
+
+  // 6. PROFILE_METADATA
+  validateEvent(NOTE_TYPES.PROFILE_METADATA, buildProfileMetadataEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    metadata: { name: "Test User" }
+  }), "buildProfileMetadataEvent");
+
+  // 7. MUTE_LIST
+  validateEvent(NOTE_TYPES.MUTE_LIST, buildMuteListEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    pTags: ["hex-pubkey"]
+  }), "buildMuteListEvent");
+
+  // 8. DELETION
+  validateEvent(NOTE_TYPES.DELETION, buildDeletionEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    eventIds: ["hex-id"]
+  }), "buildDeletionEvent");
+
+  // 9. LEGACY_DM
+  validateEvent(NOTE_TYPES.LEGACY_DM, buildLegacyDirectMessageEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    recipientPubkey: "hex-recipient",
+    ciphertext: "encrypted-content"
+  }), "buildLegacyDirectMessageEvent");
+
+  // 10. DM_ATTACHMENT
+  validateEvent(NOTE_TYPES.DM_ATTACHMENT, buildDmAttachmentEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    recipientPubkey: "hex-recipient",
+    attachment: { url: "https://example.com/file", x: "hash" }
+  }), "buildDmAttachmentEvent");
+
+  // 11. DM_READ_RECEIPT
+  validateEvent(NOTE_TYPES.DM_READ_RECEIPT, buildDmReadReceiptEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    recipientPubkey: "hex-recipient",
+    eventId: "hex-event-id"
+  }), "buildDmReadReceiptEvent");
+
+  // 12. DM_TYPING
+  validateEvent(NOTE_TYPES.DM_TYPING, buildDmTypingIndicatorEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    recipientPubkey: "hex-recipient",
+    eventId: "hex-event-id",
+    expiresAt: 1234567899
+  }), "buildDmTypingIndicatorEvent");
+
+  // 13. VIEW_EVENT
+  validateEvent(NOTE_TYPES.VIEW_EVENT, buildViewEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    pointerValue: "video-d-tag",
+    dedupeTag: "unique-session-view-id",
+    includeSessionTag: true
+  }), "buildViewEvent");
+
+  // 14. ZAP_REQUEST
+  validateEvent(NOTE_TYPES.ZAP_REQUEST, buildZapRequestEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    recipientPubkey: "hex-recipient",
+    amountSats: 100,
+    relays: ["wss://relay.example.com"]
+  }), "buildZapRequestEvent");
+
+  // 15. VIDEO_REACTION
+  validateEvent(NOTE_TYPES.VIDEO_REACTION, buildReactionEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    targetPointer: { type: "e", value: "hex-id" },
+    content: "+"
+  }), "buildReactionEvent");
+
+  // 16. VIDEO_COMMENT
+  validateEvent(NOTE_TYPES.VIDEO_COMMENT, buildCommentEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    content: "This is a comment",
+    videoEventId: "hex-video-id"
+  }), "buildCommentEvent (root)");
+
+  validateEvent(NOTE_TYPES.VIDEO_COMMENT, buildCommentEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    content: "This is a reply",
+    videoEventId: "hex-video-id",
+    rootIdentifier: "root-id",
+    parentCommentId: "parent-id"
+  }), "buildCommentEvent (reply)");
+
+  // 17. WATCH_HISTORY
+  validateEvent(NOTE_TYPES.WATCH_HISTORY, buildWatchHistoryEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    monthIdentifier: "2023-10",
+    content: "[]"
+  }), "buildWatchHistoryEvent");
+
+  // 18. SUBSCRIPTION_LIST
+  validateEvent(NOTE_TYPES.SUBSCRIPTION_LIST, buildSubscriptionListEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    content: "encrypted-json"
+  }), "buildSubscriptionListEvent");
+
+  // 19. USER_BLOCK_LIST
+  validateEvent(NOTE_TYPES.USER_BLOCK_LIST, buildBlockListEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    content: "encrypted-json"
+  }), "buildBlockListEvent");
+
+  // 20. HASHTAG_PREFERENCES
+  validateEvent(NOTE_TYPES.HASHTAG_PREFERENCES, buildHashtagPreferenceEvent({
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    content: "encrypted-json"
+  }), "buildHashtagPreferenceEvent");
+
+  // 21. ADMIN_MODERATION_LIST
+  validateEvent(NOTE_TYPES.ADMIN_MODERATION_LIST, buildAdminListEvent("moderation", {
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    hexPubkeys: ["hex-pubkey"]
+  }), "buildAdminListEvent (moderation)");
+
+  // 22. ADMIN_BLACKLIST
+  validateEvent(NOTE_TYPES.ADMIN_BLACKLIST, buildAdminListEvent("blacklist", {
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    hexPubkeys: ["hex-pubkey"]
+  }), "buildAdminListEvent (blacklist)");
+
+  // 23. ADMIN_WHITELIST
+  validateEvent(NOTE_TYPES.ADMIN_WHITELIST, buildAdminListEvent("whitelist", {
+    pubkey: "pubkey",
+    created_at: 1234567890,
+    hexPubkeys: ["hex-pubkey"]
+  }), "buildAdminListEvent (whitelist)");
+
+  console.log(`\nResults: ${successCount} passed, ${errorCount} failed.`);
+  if (errorCount > 0) {
+    process.exit(1);
+  }
+}
+
+main().catch(err => {
+  console.error(err);
+  process.exit(1);
+});