diff --git a/charts/miroir/tests/good-production.yaml b/charts/miroir/tests/good-production.yaml
index f88137a..96f9183 100644
--- a/charts/miroir/tests/good-production.yaml
+++ b/charts/miroir/tests/good-production.yaml
@@ -14,5 +14,5 @@ search_ui:
   rate_limit:
     backend: redis
 admin_ui:
-  login_rate_limit:
+  rate_limit:
     backend: redis
diff --git a/charts/miroir/tests/test_schema.py b/charts/miroir/tests/test_schema.py
index 590899b..50b4cd2 100755
--- a/charts/miroir/tests/test_schema.py
+++ b/charts/miroir/tests/test_schema.py
@@ -72,6 +72,7 @@ def validate_schema(schema: dict, instance: dict, path: str = "") -> list:
                     # Check nested properties in 'then'
                     if "properties" in then_schema:
                         for prop, prop_schema in then_schema["properties"].items():
+                            # Handle direct property constraints (e.g., taskStore.backend)
                             if prop in instance:
                                 if "properties" in prop_schema:
                                     for nested, nested_schema in prop_schema["properties"].items():
@@ -79,11 +80,33 @@ def validate_schema(schema: dict, instance: dict, path: str = "") -> list:
                                             actual = instance[prop][nested]
                                             if "const" in nested_schema:
                                                 if actual != nested_schema["const"]:
-                                                    msg = f"{path}{prop}.{nested}: expected {nested_schema['const']}, got {actual}"
-                                                    if "errorMessage" in constraint:
-                                                        msg = constraint["errorMessage"]
+                                                    msg = constraint.get("errorMessage",
+                                                        f"{path}{prop}.{nested}: expected {nested_schema['const']}, got {actual}")
                                                     errors.append(msg)
 
+                                # Handle minimum constraints (e.g., replicas minimum)
+                                if "minimum" in prop_schema:
+                                    if instance[prop] < prop_schema["minimum"]:
+                                        msg = constraint.get("errorMessage",
+                                            f"{path}{prop}: must be at least {prop_schema['minimum']}")
+                                        errors.append(msg)
+
+                            # Handle nested object constraints (e.g., search_ui.rate_limit.backend)
+                            if "properties" in prop_schema:
+                                for nested, nested_schema in prop_schema["properties"].items():
+                                    if "properties" in nested_schema:
+                                        for double_nested, double_nested_schema in nested_schema["properties"].items():
+                                            if "const" in double_nested_schema:
+                                                # Check if the nested path exists in instance
+                                                if prop in instance and isinstance(instance[prop], dict):
+                                                    if nested in instance[prop] and isinstance(instance[prop][nested], dict):
+                                                        if double_nested in instance[prop][nested]:
+                                                            actual = instance[prop][nested][double_nested]
+                                                            if actual != double_nested_schema["const"]:
+                                                                msg = constraint.get("errorMessage",
+                                                                    f"{path}{prop}.{nested}.{double_nested}: expected {double_nested_schema['const']}, got {actual}")
+                                                                errors.append(msg)
+
                     # Check required fields in 'then'
                     if "required" in then_schema:
                         for req in then_schema["required"]:
@@ -130,6 +153,68 @@ def test_schema_constraints():
                 print(f"  Error: {err}")
             failed += 1
 
+    # Test search_ui.rate_limit.backend constraint
+    search_ui_tests = [
+        # (replicas, rate_limit_backend, should_pass, description)
+        (1, "local", True, "replicas: 1 + search_ui.rate_limit.backend: local should PASS"),
+        (2, "local", False, "replicas: 2 + search_ui.rate_limit.backend: local should FAIL"),
+        (2, "redis", True, "replicas: 2 + search_ui.rate_limit.backend: redis should PASS"),
+    ]
+
+    for replicas, rate_limit_backend, should_pass, description in search_ui_tests:
+        instance = {
+            "replicas": replicas,
+            "taskStore": {"backend": "redis"},
+            "search_ui": {
+                "rate_limit": {"backend": rate_limit_backend}
+            }
+        }
+
+        miroir_schema = schema["properties"]["miroir"]
+        errors = validate_schema(miroir_schema, instance)
+
+        is_valid = len(errors) == 0
+
+        if is_valid == should_pass:
+            print(f"✓ {description}")
+            passed += 1
+        else:
+            print(f"✗ {description}")
+            for err in errors:
+                print(f"  Error: {err}")
+            failed += 1
+
+    # Test admin_ui.rate_limit.backend constraint
+    admin_ui_tests = [
+        # (replicas, rate_limit_backend, should_pass, description)
+        (1, "local", True, "replicas: 1 + admin_ui.rate_limit.backend: local should PASS"),
+        (2, "local", False, "replicas: 2 + admin_ui.rate_limit.backend: local should FAIL"),
+        (2, "redis", True, "replicas: 2 + admin_ui.rate_limit.backend: redis should PASS"),
+    ]
+
+    for replicas, rate_limit_backend, should_pass, description in admin_ui_tests:
+        instance = {
+            "replicas": replicas,
+            "taskStore": {"backend": "redis"},
+            "admin_ui": {
+                "rate_limit": {"backend": rate_limit_backend}
+            }
+        }
+
+        miroir_schema = schema["properties"]["miroir"]
+        errors = validate_schema(miroir_schema, instance)
+
+        is_valid = len(errors) == 0
+
+        if is_valid == should_pass:
+            print(f"✓ {description}")
+            passed += 1
+        else:
+            print(f"✗ {description}")
+            for err in errors:
+                print(f"  Error: {err}")
+            failed += 1
+
     print(f"\n{passed} passed, {failed} failed")
     return failed == 0
 
diff --git a/charts/miroir/values.schema.json b/charts/miroir/values.schema.json
index 696179e..70d2af6 100644
--- a/charts/miroir/values.schema.json
+++ b/charts/miroir/values.schema.json
@@ -42,12 +42,109 @@
           },
           "required": ["backend"]
         },
-        "admin": {
+        "admin_ui": {
           "type": "object",
           "properties": {
-            "enabled": {"type": "boolean"}
+            "enabled": {"type": "boolean"},
+            "path": {"type": "string"},
+            "auth": {"type": "string", "enum": ["key", "oauth", "none"]},
+            "session_ttl_s": {"type": "integer", "minimum": 1},
+            "read_only_mode": {"type": "boolean"},
+            "allowed_origins": {"type": "array", "items": {"type": "string"}},
+            "cors_allowed_origins": {"type": "array", "items": {"type": "string"}},
+            "rate_limit": {
+              "type": "object",
+              "properties": {
+                "per_ip": {"type": "string"},
+                "backend": {"type": "string", "enum": ["redis", "local"]},
+                "redis_key_prefix": {"type": "string"},
+                "redis_ttl_s": {"type": "integer", "minimum": 1}
+              },
+              "required": ["backend"]
+            },
+            "theme": {
+              "type": "object",
+              "properties": {
+                "accent_color": {"type": "string"},
+                "default_mode": {"type": "string", "enum": ["auto", "light", "dark"]}
+              }
+            },
+            "features": {
+              "type": "object",
+              "properties": {
+                "sandbox": {"type": "boolean"},
+                "shadow_viewer": {"type": "boolean"},
+                "cdc_inspector": {"type": "boolean"}
+              }
+            }
           }
         },
+        "search_ui": {
+          "type": "object",
+          "properties": {
+            "enabled": {"type": "boolean"},
+            "path": {"type": "string"},
+            "widget_script_enabled": {"type": "boolean"},
+            "embeddable": {"type": "boolean"},
+            "auth": {
+              "type": "object",
+              "properties": {
+                "mode": {"type": "string", "enum": ["public", "shared_key", "oauth_proxy"]},
+                "shared_key_env": {"type": "string"},
+                "session_ttl_s": {"type": "integer", "minimum": 1},
+                "session_rate_limit": {"type": "string"},
+                "jwt_secret_env": {"type": "string"},
+                "oauth_proxy": {
+                  "type": "object",
+                  "properties": {
+                    "user_header": {"type": "string"},
+                    "groups_header": {"type": "string"},
+                    "filter_template": {"type": ["string", "null"]},
+                    "attribute_map": {
+                      "type": "object",
+                      "properties": {
+                        "groups": {"type": "string"},
+                        "user": {"type": "string"}
+                      }
+                    }
+                  }
+                }
+              }
+            },
+            "allowed_origins": {"type": "array", "items": {"type": "string"}},
+            "scoped_key_max_age_days": {"type": "integer", "minimum": 2},
+            "scoped_key_rotate_before_expiry_days": {"type": "integer", "minimum": 1},
+            "scoped_key_rotation_drain_s": {"type": "integer", "minimum": 0},
+            "rate_limit": {
+              "type": "object",
+              "properties": {
+                "per_ip": {"type": "string"},
+                "backend": {"type": "string", "enum": ["redis", "local"]},
+                "redis_key_prefix": {"type": "string"},
+                "redis_ttl_s": {"type": "integer", "minimum": 1}
+              },
+              "required": ["backend"]
+            },
+            "cors_allowed_origins": {"type": "array", "items": {"type": "string"}},
+            "csp_overrides": {
+              "type": "object",
+              "properties": {
+                "script_src": {"type": "array", "items": {"type": "string"}},
+                "img_src": {"type": "array", "items": {"type": "string"}},
+                "connect_src": {"type": "array", "items": {"type": "string"}}
+              }
+            },
+            "csp": {"type": "string"},
+            "analytics": {
+              "type": "object",
+              "properties": {
+                "enabled": {"type": "boolean"},
+                "sink": {"type": "string"}
+              }
+            }
+          },
+          "allOf": []
+        },
         "scatter": {
           "type": "object",
           "properties": {
@@ -186,6 +283,52 @@
             },
             "errorMessage": "HPA requires replicas >= 2 and taskStore.backend='redis'"
           }
+        },
+        {
+          "if": {
+            "properties": {
+              "replicas": {"minimum": 2}
+            },
+            "required": ["replicas"]
+          },
+          "then": {
+            "properties": {
+              "search_ui": {
+                "properties": {
+                  "rate_limit": {
+                    "properties": {
+                      "backend": {"const": "redis"}
+                    },
+                    "required": ["backend"]
+                  }
+                }
+              }
+            },
+            "errorMessage": "search_ui.rate_limit.backend must be 'redis' when replicas > 1 (local rate limiting is per-pod and produces effective rate of per_ip × pod_count)"
+          }
+        },
+        {
+          "if": {
+            "properties": {
+              "replicas": {"minimum": 2}
+            },
+            "required": ["replicas"]
+          },
+          "then": {
+            "properties": {
+              "admin_ui": {
+                "properties": {
+                  "rate_limit": {
+                    "properties": {
+                      "backend": {"const": "redis"}
+                    },
+                    "required": ["backend"]
+                  }
+                }
+              }
+            },
+            "errorMessage": "admin_ui.rate_limit.backend must be 'redis' when replicas > 1 (local rate limiting is per-pod and produces effective rate of per_ip × pod_count)"
+          }
         }
       ]
     },
diff --git a/charts/miroir/values.yaml b/charts/miroir/values.yaml
index bacc438..0ed11ec 100644
--- a/charts/miroir/values.yaml
+++ b/charts/miroir/values.yaml
@@ -22,9 +22,65 @@ miroir:
     path: /data/miroir-tasks.db
     url: ""  # for redis: redis://host:6379
 
-  # Admin UI
-  admin:
+  # Admin UI (plan §13.19)
+  admin_ui:
     enabled: true
+    path: /_miroir/admin
+    auth: key  # key | oauth (future) | none (dev only)
+    session_ttl_s: 3600
+    read_only_mode: false
+    allowed_origins: [same-origin]
+    cors_allowed_origins: []
+    rate_limit:
+      per_ip: "10/minute"
+      backend: redis  # redis | local (per-pod); redis required when replicas > 1
+      redis_key_prefix: "miroir:ratelimit:adminlogin:"
+      redis_ttl_s: 60
+    theme:
+      accent_color: "#2563eb"
+      default_mode: auto
+    features:
+      sandbox: true
+      shadow_viewer: true
+      cdc_inspector: true
+
+  # Search UI (plan §13.21)
+  search_ui:
+    enabled: true
+    path: /ui/search
+    widget_script_enabled: true
+    embeddable: true
+    auth:
+      mode: public  # public | shared_key | oauth_proxy
+      shared_key_env: ""
+      session_ttl_s: 900
+      session_rate_limit: "10/minute"
+      jwt_secret_env: SEARCH_UI_JWT_SECRET
+      oauth_proxy:
+        user_header: X-Forwarded-User
+        groups_header: X-Forwarded-Groups
+        filter_template: null
+        attribute_map:
+          groups: groups_array
+          user: user_id_string
+    allowed_origins: ["*"]
+    scoped_key_max_age_days: 60
+    scoped_key_rotate_before_expiry_days: 30
+    scoped_key_rotation_drain_s: 120
+    rate_limit:
+      per_ip: "60/minute"
+      backend: redis  # redis | local (per-pod); redis required when replicas > 1
+      redis_key_prefix: "miroir:ratelimit:searchui:"
+      redis_ttl_s: 60
+    cors_allowed_origins: []
+    csp_overrides:
+      script_src: []
+      img_src: []
+      connect_src: []
+    csp: "default-src 'self'; img-src 'self' https:; style-src 'self' 'unsafe-inline'"
+    analytics:
+      enabled: false
+      sink: cdc
 
   # Scatter policy for unavailable shards
   scatter: