diff --git a/schemas/plans.json b/schemas/plans.json
new file mode 100644
index 0000000..b212ea2
--- /dev/null
+++ b/schemas/plans.json
@@ -0,0 +1,53 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://example.local/schemas/plans.json",
+  "title": "Plan",
+  "type": "object",
+  "additionalProperties": false,
+  "required": [
+    "id", "template_id", "title", "discipline", "age_group", "target_group",
+    "total_minutes", "sections", "goals", "capability_summary", "created_by",
+    "created_at", "source", "fingerprint"
+  ],
+  "properties": {
+    "id": { "type": "string" },
+    "template_id": { "type": ["string", "null"] },
+    "title": { "type": "string", "minLength": 1 },
+    "discipline": { "type": "string" },
+    "age_group": { "type": "string" },
+    "target_group": { "type": "string" },
+    "total_minutes": { "type": "integer", "minimum": 0 },
+    "sections": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "additionalProperties": false,
+        "required": ["name", "items", "minutes"],
+        "properties": {
+          "name": { "type": "string" },
+          "minutes": { "type": "integer", "minimum": 0 },
+          "items": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "additionalProperties": false,
+              "required": ["exercise_external_id", "duration", "why"],
+              "properties": {
+                "exercise_external_id": { "type": "string" },
+                "duration": { "type": "integer", "minimum": 0 },
+                "why": { "type": "string" }
+              }
+            }
+          }
+        }
+      }
+    },
+    "goals": { "type": "array", "items": { "type": "string" } },
+    "capability_summary": { "type": "object", "additionalProperties": { "type": "integer" } },
+    "novelty_against_last_n": { "type": ["number", "null"] },
+    "fingerprint": { "type": "string" },
+    "created_by": { "type": "string" },
+    "created_at": { "type": "string", "format": "date-time" },
+    "source": { "type": "string" }
+  }
+}
\ No newline at end of file