diff --git a/package.json b/package.json
index f20d44a..25da7d4 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "private": true,
   "scripts": {
     "dev": "next dev",
-    "build": "npm run storage:legacy-boundary && prisma generate && next build",
+    "build": "npm run storage:legacy-boundary && prisma generate && npm run prisma:verify-client && next build",
     "start": "next start",
     "lint": "next lint",
     "typecheck": "tsc --noEmit",
@@ -22,6 +22,7 @@
     "history:scan": "tsx scripts/scan-history-materials.ts",
     "history:import": "tsx scripts/import-history-materials.ts",
     "prisma:generate": "prisma generate",
+    "prisma:verify-client": "node scripts/verify-prisma-client-schema.mjs",
     "prisma:push": "prisma db push",
     "prisma:studio": "prisma studio"
   },
diff --git a/scripts/verify-prisma-client-schema.mjs b/scripts/verify-prisma-client-schema.mjs
new file mode 100644
index 0000000..e7656cf
--- /dev/null
+++ b/scripts/verify-prisma-client-schema.mjs
@@ -0,0 +1,55 @@
+import fs from 'node:fs'
+import path from 'node:path'
+import { createRequire } from 'node:module'
+
+const ROOT = process.cwd()
+const SOURCE_SCHEMA = path.join(ROOT, 'prisma', 'schema.prisma')
+const require = createRequire(import.meta.url)
+const clientPackage = require.resolve('@prisma/client/package.json')
+const GENERATED_SCHEMA = path.resolve(path.dirname(clientPackage), '..', '..', '.prisma', 'client', 'schema.prisma')
+
+function readSchemaShape(schemaPath) {
+  const source = fs.readFileSync(schemaPath, 'utf8')
+  const shape = {}
+  const declaration = /(?:^|\n)(model|enum)\s+(\w+)\s*\{([\s\S]*?)\n\}/g
+
+  for (const match of source.matchAll(declaration)) {
+    const [, kind, name, body] = match
+    const members = []
+
+    for (const rawLine of body.split(/\r?\n/)) {
+      const line = rawLine.trim()
+      if (!line || line.startsWith('//') || line.startsWith('@@')) continue
+      const [memberName, memberType] = line.split(/\s+/)
+      members.push(kind === 'model' ? `${memberName}:${memberType}` : memberName)
+    }
+
+    shape[`${kind}:${name}`] = members.sort()
+  }
+
+  return shape
+}
+
+if (!fs.existsSync(GENERATED_SCHEMA)) {
+  throw new Error(`Prisma Client schema is missing: ${GENERATED_SCHEMA}`)
+}
+
+const sourceShape = readSchemaShape(SOURCE_SCHEMA)
+const generatedShape = readSchemaShape(GENERATED_SCHEMA)
+
+if (JSON.stringify(sourceShape) !== JSON.stringify(generatedShape)) {
+  const sourceKeys = new Set(Object.keys(sourceShape))
+  const generatedKeys = new Set(Object.keys(generatedShape))
+  const missingDeclarations = [...sourceKeys].filter((key) => !generatedKeys.has(key))
+  const staleDeclarations = [...sourceKeys].filter((key) => (
+    generatedKeys.has(key)
+    && JSON.stringify(sourceShape[key]) !== JSON.stringify(generatedShape[key])
+  ))
+  throw new Error(
+    `Prisma Client does not match prisma/schema.prisma; regenerate it before building. `
+      + `Missing declarations: ${missingDeclarations.join(', ') || 'none'}. `
+      + `Stale declarations: ${staleDeclarations.join(', ') || 'none'}.`,
+  )
+}
+
+console.log(`Prisma Client schema verified (${Object.keys(sourceShape).length} declarations)`)