diff --git a/LifeOS/install/hooks/DocIntegrity.hook.ts b/LifeOS/install/hooks/DocIntegrity.hook.ts
index 154235fd46..8c94126211 100755
--- a/LifeOS/install/hooks/DocIntegrity.hook.ts
+++ b/LifeOS/install/hooks/DocIntegrity.hook.ts
@@ -19,6 +19,7 @@ import { readHookInput, parseTranscriptFromInput } from './lib/hook-io';
 import { handleDocCrossRefIntegrity } from './handlers/DocCrossRefIntegrity';
 import { handleRebuildArchSummary } from './handlers/RebuildArchSummary';
 import { handleMemoryDirIntegrity } from './handlers/MemoryDirIntegrity';
+import { handleRebuildKnowledgeSchema } from './handlers/RebuildKnowledgeSchema';
 
 async function main() {
   const input = await readHookInput();
@@ -59,6 +60,12 @@ async function main() {
     console.error('[DocIntegrity] Memory-dir handler failed:', err);
   }
 
+  try {
+    await handleRebuildKnowledgeSchema();
+  } catch (err) {
+    console.error('[DocIntegrity] Knowledge-schema regen failed:', err);
+  }
+
   process.exit(0);
 }
 
diff --git a/LifeOS/install/hooks/handlers/RebuildKnowledgeSchema.ts b/LifeOS/install/hooks/handlers/RebuildKnowledgeSchema.ts
new file mode 100644
index 0000000000..2beee6d878
--- /dev/null
+++ b/LifeOS/install/hooks/handlers/RebuildKnowledgeSchema.ts
@@ -0,0 +1,21 @@
+/**
+ * RebuildKnowledgeSchema — regenerate `MEMORY/KNOWLEDGE/_schema.md` from
+ * `KnowledgeSchema.ts` (the pure-data source of truth) on the doc-integrity
+ * pass, so the schema doc never drifts from the schema and exists on every
+ * install. Fire-and-forget; a failure is non-fatal (logged by the caller).
+ *
+ * Runs the standalone generator as a subprocess rather than importing it,
+ * because `GenerateKnowledgeSchemaDoc.ts` executes `main()` on import.
+ */
+import { spawn } from "child_process";
+import { join } from "path";
+import { getLifeosDir } from "../lib/paths";
+
+export async function handleRebuildKnowledgeSchema(): Promise<void> {
+  const generator = join(getLifeosDir(), "TOOLS", "GenerateKnowledgeSchemaDoc.ts");
+  await new Promise<void>((resolve) => {
+    const child = spawn("bun", [generator], { stdio: "ignore" });
+    child.on("close", () => resolve());
+    child.on("error", () => resolve());
+  });
+}