fix: defer inlineData parts to end of array for parallel tool calls (#91)

When multiple tool_results contain images, the inlineData parts were
being interleaved between functionResponse parts, breaking Claude's API
requirement that functionResponse parts be consecutive.

Co-Authored-By: Claude <noreply@anthropic.com>

src/format/content-converter.js

@@ -35,6 +35,7 @@ export function convertContentToParts(content, isClaudeModel = false, isGeminiMo
     }
 
     const parts = [];
+    const deferredInlineData = []; // Collect inlineData to add at the end (Issue #91)
 
     for (const block of content) {
         if (!block) continue;
@@ -152,8 +153,9 @@ export function convertContentToParts(content, isClaudeModel = false, isGeminiMo
 
             parts.push({ functionResponse });
 
-            // Add any images from the tool result as separate parts
-            parts.push(...imageParts);
+            // Defer images from the tool result to end of parts array (Issue #91)
+            // This ensures all functionResponse parts are consecutive
+            deferredInlineData.push(...imageParts);
         } else if (block.type === 'thinking') {
             // Handle thinking blocks with signature compatibility check
             if (block.signature && block.signature.length >= MIN_SIGNATURE_LENGTH) {
@@ -183,5 +185,9 @@ export function convertContentToParts(content, isClaudeModel = false, isGeminiMo
         }
     }
 
+    // Add deferred inlineData at the end (Issue #91)
+    // This ensures functionResponse parts are consecutive, which Claude's API requires
+    parts.push(...deferredInlineData);
+
     return parts;
 }

src/format/request-converter.js

@@ -95,8 +95,7 @@ export function convertAnthropicToGoogle(anthropicRequest) {
     }
 
     // Convert messages to contents, then filter unsigned thinking blocks
-    for (let i = 0; i < processedMessages.length; i++) {
-        const msg = processedMessages[i];
+    for (const msg of processedMessages) {
         let msgContent = msg.content;
 
         // For assistant messages, process thinking blocks and reorder content