Refactor plugin

plugins/gemini.js

@@ -0,0 +1,33 @@
+module.exports = {
+  afterTransformRequest(req, res) {
+    if (Array.isArray(req.body.tools)) {
+      // rewrite tools definition
+      req.body.tools.forEach((tool) => {
+        if (tool.function.name === "BatchTool") {
+          // HACK: Gemini does not support objects with empty properties
+          tool.function.parameters.properties.invocations.items.properties.input.type =
+            "number";
+          return;
+        }
+        Object.keys(tool.function.parameters.properties).forEach((key) => {
+          const prop = tool.function.parameters.properties[key];
+          if (
+            prop.type === "string" &&
+            !["enum", "date-time"].includes(prop.format)
+          ) {
+            delete prop.format;
+          }
+        });
+      });
+    }
+    if (req.body?.messages?.length) {
+      req.body.messages.forEach((message) => {
+        if (message.content === null) {
+          if (message.tool_calls) {
+            message.content = JSON.stringify(message.tool_calls);
+          }
+        }
+      });
+    }
+  },
+};