diff --git a/docs/components/backend/analytics/openapi.json b/docs/components/backend/analytics/openapi.json
index 1debe37ac..1bd5f1003 100644
--- a/docs/components/backend/analytics/openapi.json
+++ b/docs/components/backend/analytics/openapi.json
@@ -3209,16 +3209,6 @@
             },
             "description": "Metric definitions"
           },
-          "400": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Bad Request"
-          },
           "401": {
             "content": {
               "application/problem+json": {
@@ -3229,46 +3219,6 @@
             },
             "description": "Unauthorized"
           },
-          "403": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Forbidden"
-          },
-          "404": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Not Found"
-          },
-          "409": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Conflict"
-          },
-          "429": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Too Many Requests"
-          },
           "500": {
             "content": {
               "application/problem+json": {
@@ -3333,16 +3283,6 @@
             },
             "description": "Unauthorized"
           },
-          "403": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Forbidden"
-          },
           "404": {
             "content": {
               "application/problem+json": {
@@ -3353,7 +3293,7 @@
             },
             "description": "Not Found"
           },
-          "409": {
+          "415": {
             "content": {
               "application/problem+json": {
                 "schema": {
@@ -3361,7 +3301,7 @@
                 }
               }
             },
-            "description": "Conflict"
+            "description": "Unsupported Media Type"
           },
           "429": {
             "content": {
@@ -3447,17 +3387,7 @@
             },
             "description": "Forbidden"
           },
-          "404": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Not Found"
-          },
-          "409": {
+          "415": {
             "content": {
               "application/problem+json": {
                 "schema": {
@@ -3465,17 +3395,7 @@
                 }
               }
             },
-            "description": "Conflict"
-          },
-          "429": {
-            "content": {
-              "application/problem+json": {
-                "schema": {
-                  "$ref": "#/components/schemas/Problem"
-                }
-              }
-            },
-            "description": "Too Many Requests"
+            "description": "Unsupported Media Type"
           },
           "500": {
             "content": {
diff --git a/src/backend/services/analytics/src/api/mod.rs b/src/backend/services/analytics/src/api/mod.rs
index f158dccfc..6d8bc9b24 100644
--- a/src/backend/services/analytics/src/api/mod.rs
+++ b/src/backend/services/analytics/src/api/mod.rs
@@ -235,7 +235,11 @@ fn build_operations(router: Router, openapi: &dyn OpenApiRegistry) -> Router {
             StatusCode::OK,
             "Metric results",
         )
-        .standard_errors(openapi)
+        .error_400(openapi)
+        .error_401(openapi)
+        .error_403(openapi)
+        .error_415(openapi)
+        .error_500(openapi)
         .handler(metric_results::query_metric_results)
         .register(router, openapi);
 
@@ -345,7 +349,12 @@ fn build_operations(router: Router, openapi: &dyn OpenApiRegistry) -> Router {
             StatusCode::OK,
             "Metric evidence",
         )
-        .standard_errors(openapi)
+        .error_400(openapi)
+        .error_401(openapi)
+        .error_404(openapi)
+        .error_415(openapi)
+        .error_429(openapi)
+        .error_500(openapi)
         .handler(metric_drilldown::query_metric_drilldown)
         .register(router, openapi);
 
@@ -480,7 +489,8 @@ fn build_operations(router: Router, openapi: &dyn OpenApiRegistry) -> Router {
             StatusCode::OK,
             "Metric definitions",
         )
-        .standard_errors(openapi)
+        .error_401(openapi)
+        .error_500(openapi)
         .handler(metric_definitions::list_metric_definitions)
         .register(router, openapi);
 
diff --git a/src/ingestion/tests/e2e/api/test_metric_results.py b/src/ingestion/tests/e2e/api/test_metric_results.py
index afaa698c6..30ffa0d89 100644
--- a/src/ingestion/tests/e2e/api/test_metric_results.py
+++ b/src/ingestion/tests/e2e/api/test_metric_results.py
@@ -64,7 +64,7 @@ def test_metric_results_400_reversed_period(api) -> None:
 def test_metric_results_400_unknown_metric_key(api) -> None:
     """An unknown `metric_key` is resolved against the catalog and rejected as a
     400 (`unavailable`) — NOT a 404. Pins that the compute endpoint has no
-    not-found path (the spec's declared 404 is `.standard_errors` boilerplate)."""
+    not-found path, which is why the spec declares no 404 for it."""
     body = _request(
         metrics=[{"metric_key": "e2e.definitely-not-a-real-metric", "views": [{"view": "period"}]}],
     )
diff --git a/src/ingestion/tests/e2e/lib/api_coverage.py b/src/ingestion/tests/e2e/lib/api_coverage.py
index 3900861eb..d9c240707 100755
--- a/src/ingestion/tests/e2e/lib/api_coverage.py
+++ b/src/ingestion/tests/e2e/lib/api_coverage.py
@@ -76,8 +76,6 @@
     "POST /v1/admin/metric-thresholds": frozenset({404, 409}),  # 404 boilerplate; 409=#1664
     # persons 200/404 covered via the in-process Identity stub (#1691); rest boilerplate
     "GET /v1/persons/{email}": frozenset({400, 403, 409}),
-    # 404/409 boilerplate; 403 IS reachable (person outside the caller's visible set)
-    "POST /v1/metric-results": frozenset({404, 409}),
     # saved-query CRUD + run (#1965): 403 (no role gate — cross-tenant is 404 by
     # opacity) and 409 (no conflict path) are `.standard_errors` boilerplate.
     "GET /v1/queries": frozenset({400, 403, 404, 409}),  # boilerplate: list, no input/lookup/conflict