diff --git a/dist/providers/google-gemini-cli.js b/dist/providers/google-gemini-cli.js
index cc9e0cb..2b18ec4 100644
--- a/dist/providers/google-gemini-cli.js
+++ b/dist/providers/google-gemini-cli.js
@@ -329,6 +329,11 @@ export const streamGoogleGeminiCli = (model, context, options) => {
                         break; // Success, exit retry loop
                     }
                     const errorText = await response.text();
+                    // Fail immediately on 429 for Antigravity to let callers rotate accounts.
+                    // Antigravity rate limits can have very long retry delays (10+ minutes).
+                    if (isAntigravity && response.status === 429) {
+                        throw new Error(`Cloud Code Assist API error (${response.status}): ${errorText}`);
+                    }
                     // Check if retryable
                     if (attempt < MAX_RETRIES && isRetryableError(response.status, errorText)) {
                         // Use server-provided delay or exponential backoff
diff --git a/dist/providers/openai-codex-responses.js b/dist/providers/openai-codex-responses.js
index 7488c79..4c34587 100644
--- a/dist/providers/openai-codex-responses.js
+++ b/dist/providers/openai-codex-responses.js
@@ -517,7 +517,7 @@ function convertTools(tools) {
         name: tool.name,
         description: tool.description,
         parameters: tool.parameters,
-        strict: null,
+        strict: false,
     }));
 }
 function mapStopReason(status) {
diff --git a/dist/providers/openai-responses.js b/dist/providers/openai-responses.js
index c4714f4..4d1e6b0 100644
--- a/dist/providers/openai-responses.js
+++ b/dist/providers/openai-responses.js
@@ -400,10 +400,16 @@ function convertMessages(model, context) {
         }
         else if (msg.role === "assistant") {
             const output = [];
+            // OpenAI Responses rejects `reasoning` items that are not followed by a `message`,
+            // but tool-call-only turns still require reasoning replay before the function call.
+            const hasTextBlock = msg.content.some((b) => b.type === "text");
+            const hasToolCallBlock = msg.content.some((b) => b.type === "toolCall");
             for (const block of msg.content) {
                 // Do not submit thinking blocks if the completion had an error (i.e. abort)
                 if (block.type === "thinking" && msg.stopReason !== "error") {
                     if (block.thinkingSignature) {
+                        if (!hasTextBlock && !hasToolCallBlock)
+                            continue;
                         const reasoningItem = JSON.parse(block.thinkingSignature);
                         output.push(reasoningItem);
                     }
@@ -438,6 +444,16 @@ function convertMessages(model, context) {
                     });
                 }
             }
+            const hasAssistantMessage = output.some((item) => item.type === "message");
+            const hasFunctionCall = output.some((item) => item.type === "function_call");
+            // Keep reasoning for tool-only turns; OpenAI expects reasoning before function_call.
+            if (!hasAssistantMessage && !hasFunctionCall) {
+                for (let i = output.length - 1; i >= 0; i -= 1) {
+                    if (output[i].type === "reasoning") {
+                        output.splice(i, 1);
+                    }
+                }
+            }
             if (output.length === 0)
                 continue;
             messages.push(...output);