[inference] fix tool definition for rainbow-sprinkles (#208823)

## Summary

Port the tool definition hack that was done for bedrock to be used for
`rainbow-sprinkles` too.

x-pack/platform/plugins/shared/inference/server/chat_complete/adapters/inference/providers/apply_provider_transforms.ts

@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { InferenceEndpointProvider, ToolOptions } from '@kbn/inference-common';
+import { InferenceEndpointProvider, MessageRole, ToolOptions } from '@kbn/inference-common';
 import { fixSchemaArrayProperties } from '../../bedrock/convert_tools';
 import type { CreateOpenAIRequestOptions } from '../types';
 import { getProvider, getElasticModelProvider } from '../utils';
@@ -40,5 +40,25 @@ const applyBedrockTransforms = (
     }, {} as Required<ToolOptions>['tools']);
   }
 
+  const hasToolUse = options.messages.some(
+    (message) =>
+      message.role === MessageRole.Tool ||
+      (message.role === MessageRole.Assistant && message.toolCalls?.length)
+  );
+
+  // bedrock does not accept tool calls in conversation history
+  // if no tools are present in the request.
+  if (hasToolUse && Object.keys(options.tools ?? {}).length === 0) {
+    options.tools = {
+      doNotCallThisTool: {
+        description: 'Do not call this tool, it is strictly forbidden',
+        schema: {
+          type: 'object',
+          properties: {},
+        },
+      },
+    };
+  }
+
   return options;
 };