diff --git a/src/modules/llms/server/listModels.dispatch.ts b/src/modules/llms/server/listModels.dispatch.ts
index 7eef7cff8..a496925c8 100644
--- a/src/modules/llms/server/listModels.dispatch.ts
+++ b/src/modules/llms/server/listModels.dispatch.ts
@@ -8,7 +8,7 @@ import { createDebugWireLogger } from '~/server/wire';
 import { fetchJsonOrTRPCThrow } from '~/server/trpc/trpc.router.fetchers';
 
 import type { ModelDescriptionSchema } from './llm.server.types';
-import { llmsAutoImplyInterfaces } from './models.mappings';
+import { llmDevValidateParameterSpecs_DEV, llmsAutoImplyInterfaces } from './models.mappings';
 
 
 // protocol: Anthropic
@@ -71,8 +71,14 @@ function createDispatch<T>(dispatch: ListModelsDispatch<T>): ListModelsDispatch<
 export async function listModelsRunDispatch(access: AixAPI_Access, signal?: AbortSignal): Promise<ModelDescriptionSchema[]> {
   const dispatch = _listModelsCreateDispatch(access, signal);
   const wireModels = await dispatch.fetchModels();
-  return dispatch.convertToDescriptions(wireModels)
+  const models = dispatch.convertToDescriptions(wireModels)
     .map(llmsAutoImplyInterfaces); // auto-inject implied IFs from parameterSpecs
+
+  // DEV: validate parameterSpecs (enumValues ⊆ registry values, paramId existence)
+  if (process.env.NODE_ENV === 'development')
+    models.forEach(llmDevValidateParameterSpecs_DEV);
+
+  return models;
 }
 
 
diff --git a/src/modules/llms/server/models.mappings.ts b/src/modules/llms/server/models.mappings.ts
index ffc97e609..72137b87b 100644
--- a/src/modules/llms/server/models.mappings.ts
+++ b/src/modules/llms/server/models.mappings.ts
@@ -1,5 +1,6 @@
 import type { DModelInterfaceV1 } from '~/common/stores/llms/llms.types';
 import type { DModelParameterId } from '~/common/stores/llms/llms.parameters';
+import { DModelParameterRegistry } from '~/common/stores/llms/llms.parameters';
 import { LLM_IF_Outputs_Image, LLM_IF_Tools_WebSearch } from '~/common/stores/llms/llms.types';
 
 import type { ModelDescriptionSchema } from './llm.server.types';
@@ -79,6 +80,36 @@ export function llmDevCheckModels_DEV(vendor: string, apiIds: string[], knownIds
   }
 }
 
+// -- Dev parameterSpecs validation --
+
+/**
+ * DEV: Validates parameterSpecs for a model description.
+ * - Checks that each paramId exists in the DModelParameterRegistry
+ * - For enum params with enumValues, checks that enumValues ⊆ registry.values
+ */
+export function llmDevValidateParameterSpecs_DEV(model: ModelDescriptionSchema): void {
+  if (!model.parameterSpecs?.length) return;
+
+  for (const spec of model.parameterSpecs) {
+    const paramId = spec.paramId;
+    const regDef = DModelParameterRegistry[paramId];
+
+    // check paramId exists in registry
+    if (!regDef) {
+      console.warn(`[DEV] Model '${model.id}': unknown paramId '${paramId}' in parameterSpecs`);
+      continue;
+    }
+
+    // for enum params with enumValues, check containment
+    if (regDef.type === 'enum' && 'values' in regDef && spec.enumValues) {
+      const registryValues = regDef.values as ReadonlyArray<string>;
+      const invalid = spec.enumValues.filter(v => !registryValues.includes(v));
+      if (invalid.length)
+        console.warn(`[DEV] Model '${model.id}': paramId '${paramId}' has enumValues not in registry: [${invalid.join(', ')}] (valid: [${registryValues.join(', ')}])`);
+    }
+  }
+}
+
 
 // -- Manual model mappings: types and helper --