diff --git a/src/lib/openapi/routes/auth.ts b/src/lib/openapi/routes/auth.ts
index 6f4457d9a..efcb7a878 100644
--- a/src/lib/openapi/routes/auth.ts
+++ b/src/lib/openapi/routes/auth.ts
@@ -1656,6 +1656,10 @@ export const authPaths: NonNullable<ZodOpenApiObject["paths"]> = {
           description: "Content-Type is not `application/json`.",
           content: { "application/json": { schema: errorEnvelope } },
         },
+        // After the spread, not before: `stdResponses` carries its own 422 and
+        // 429, and a key placed ahead of it is silently overwritten by the
+        // generic wording. Same ordering as the MCP mint next door.
+        ...stdResponses,
         "422": {
           description:
             "Validation failed. The envelope carries every offending issue, not just the first.",
@@ -1666,7 +1670,6 @@ export const authPaths: NonNullable<ZodOpenApiObject["paths"]> = {
             "More than 10 mints from this account in a minute. Nothing was minted.",
           content: { "application/json": { schema: errorEnvelope } },
         },
-        ...stdResponses,
       },
     },
   },
diff --git a/src/lib/openapi/routes/measurements.ts b/src/lib/openapi/routes/measurements.ts
index 2496ef909..ff655f406 100644
--- a/src/lib/openapi/routes/measurements.ts
+++ b/src/lib/openapi/routes/measurements.ts
@@ -876,12 +876,14 @@ export const measurementPaths: NonNullable<ZodOpenApiObject["paths"]> = {
             "A measurement with this data already exists — the `(userId, type, source, externalId)` dedup index rejected the write.",
           content: { "application/json": { schema: errorEnvelope } },
         },
+        // After the spread: `stdResponses` carries a generic 422 that would
+        // otherwise overwrite this one.
+        ...stdResponses,
         "422": {
           description:
             "Validation failed, or (`measurement.create.source_not_permitted`) a narrow `measurements:write` credential named `APPLE_HEALTH` as the source. Refused rather than relabelled, so the caller can fix the payload instead of discovering rows it did not ask for.",
           content: { "application/json": { schema: errorEnvelope } },
         },
-        ...stdResponses,
       },
     },
   },
@@ -996,12 +998,14 @@ export const measurementPaths: NonNullable<ZodOpenApiObject["paths"]> = {
             },
           },
         },
+        // After the spread: `stdResponses` carries a generic 422 that would
+        // otherwise overwrite this one.
+        ...stdResponses,
         "422": {
           description:
             "The batch exceeded the 500-entry limit (`measurement.batch.too_large`), failed validation, or (`measurement.batch.source_not_permitted`) carried an entry naming `APPLE_HEALTH` under a narrow `measurements:write` credential. Nothing was written in any of the three cases.",
           content: { "application/json": { schema: errorEnvelope } },
         },
-        ...stdResponses,
       },
     },
   },