diff --git a/dist/providers/google-gemini-cli.js b/dist/providers/google-gemini-cli.js
index 93aa26c395e9bd0df64376408a13d15ee9e7cce7..41a439e5fc370038a5febef9e8f021ee279cf8aa 100644
--- a/dist/providers/google-gemini-cli.js
+++ b/dist/providers/google-gemini-cli.js
@@ -248,6 +248,11 @@ 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 188a8294f26fe1bfe3fb298a7f58e4d8eaf2a529..3fd8027edafdad4ca364af53f0a1811139705b21 100644
--- a/dist/providers/openai-codex-responses.js
+++ b/dist/providers/openai-codex-responses.js
@@ -433,9 +433,15 @@ function convertMessages(model, context) {
         }
         else if (msg.role === "assistant") {
             const output = [];
+            // OpenAI Responses rejects `reasoning` items that are not followed by a `message`.
+            // Tool-call-only turns (thinking + function_call) are valid assistant turns, but
+            // their stored reasoning items must not be replayed as standalone `reasoning` input.
+            const hasTextBlock = msg.content.some((b) => b.type === "text");
             for (const block of msg.content) {
                 if (block.type === "thinking" && msg.stopReason !== "error") {
                     if (block.thinkingSignature) {
+                        if (!hasTextBlock)
+                            continue;
                         const reasoningItem = JSON.parse(block.thinkingSignature);
                         output.push(reasoningItem);
                     }
diff --git a/dist/providers/openai-responses.js b/dist/providers/openai-responses.js
index 20fb0a22aaa28f7ff7c2f44a8b628fa1d9d7d936..0bf46bfb4a6fac5a0304652e42566b2c991bab48 100644
--- a/dist/providers/openai-responses.js
+++ b/dist/providers/openai-responses.js
@@ -396,10 +396,16 @@ function convertMessages(model, context) {
         }
         else if (msg.role === "assistant") {
             const output = [];
+            // OpenAI Responses rejects `reasoning` items that are not followed by a `message`.
+            // Tool-call-only turns (thinking + function_call) are valid assistant turns, but
+            // their stored reasoning items must not be replayed as standalone `reasoning` input.
+            const hasTextBlock = msg.content.some((b) => b.type === "text");
             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)
+                            continue;
                         const reasoningItem = JSON.parse(block.thinkingSignature);
                         output.push(reasoningItem);
                     }