From d2d4cf0e1758265c4ca5b030fb82c093545a70be Mon Sep 17 00:00:00 2001
From: Saren <saren@dumstruck.com>
Date: Sun, 12 Jul 2026 06:47:51 -0700
Subject: [PATCH] fix(sse): normalize assistant input_text to output_text in
 Codex Responses input (#6932)
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codex-cli replays assistant history with content parts typed as
`input_text`, but the Responses API only accepts `output_text`
(or `refusal`) on assistant turns — `input_text` is user-only.
`normalizeCodexMessageContentPart` previously only rewrote parts
literally typed `text`, leaving explicit `input_text` on assistant
turns untouched, which the Codex/OpenAI backend rejects with a 400.

Rewrite explicit `input_text` (and `text`) to `output_text` on
assistant-role parts, dropping the assistant-only `annotations`,
`logprobs`, and `obfuscation` fields. Mode-agnostic, applies to
all Codex models.

Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
---
 ...odex-assistant-input-text-normalization.md |  1 +
 open-sse/utils/responsesInputNormalization.ts |  9 ++++
 .../unit/responses-translation-fixes.test.ts  | 54 +++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 changelog.d/fixes/6932-codex-assistant-input-text-normalization.md

diff --git a/changelog.d/fixes/6932-codex-assistant-input-text-normalization.md b/changelog.d/fixes/6932-codex-assistant-input-text-normalization.md
new file mode 100644
index 0000000000..3ae7dc8dc9
--- /dev/null
+++ b/changelog.d/fixes/6932-codex-assistant-input-text-normalization.md
@@ -0,0 +1 @@
+- fix(sse): `normalizeCodexMessageContentPart` now rewrites explicit `type: "input_text"` (not just `type: "text"`) to `output_text` on assistant-role Codex Responses input parts, so replayed assistant history sent by codex-cli as `input_text` is no longer rejected by the Codex/OpenAI backend (#6932)
diff --git a/open-sse/utils/responsesInputNormalization.ts b/open-sse/utils/responsesInputNormalization.ts
index da1517a812..7c176d9ab0 100644
--- a/open-sse/utils/responsesInputNormalization.ts
+++ b/open-sse/utils/responsesInputNormalization.ts
@@ -10,6 +10,15 @@ function normalizeCodexMessageContentPart(part: unknown, role: string): unknown
 
   const record = { ...(part as JsonRecord) };
   if (record.type === "text") record.type = textPartTypeForRole(role);
+  // Assistant history in the Responses API must use `output_text` (or `refusal`),
+  // never `input_text` (which is user-only). codex-cli sends assistant turns as
+  // `input_text`; normalize them so the Codex/OpenAI backend accepts the replay.
+  if (role === "assistant" && (record.type === "input_text" || record.type === "text")) {
+    record.type = "output_text";
+    delete record.annotations;
+    delete record.logprobs;
+    delete record.obfuscation;
+  }
   return record;
 }
 
diff --git a/tests/unit/responses-translation-fixes.test.ts b/tests/unit/responses-translation-fixes.test.ts
index c29641c6a3..2cffb53ff2 100644
--- a/tests/unit/responses-translation-fixes.test.ts
+++ b/tests/unit/responses-translation-fixes.test.ts
@@ -126,6 +126,60 @@ test("Codex Responses input: null input normalizes to an empty list (not [null])
   assert.deepEqual(body.input, []);
 });
 
+test("Codex Responses input: assistant history normalized to output_text (OpenAI/Codex rejects input_text on assistant turns)", () => {
+  const body: Record<string, unknown> = {
+    input: [
+      {
+        type: "message",
+        role: "assistant",
+        content: [
+          {
+            type: "input_text",
+            text: "Previous assistant answer",
+            annotations: [{ type: "url_citation", url: "https://example.com" }],
+            logprobs: [{ token: "Previous" }],
+            obfuscation: "opaque",
+          },
+          { type: "scoped_content", scope: "internal", content: "Preserve me" },
+        ],
+      },
+      {
+        type: "message",
+        role: "user",
+        content: [
+          { type: "input_image", image_url: "https://example.com/image.png", detail: "high" },
+          { type: "input_file", file_id: "file_123" },
+        ],
+      },
+      { type: "function_call", call_id: "call_123", name: "lookup", arguments: "{}" },
+      { type: "function_call_output", call_id: "call_123", output: "done" },
+    ],
+  };
+
+  normalizeCodexResponsesInput(body);
+
+  assert.deepEqual(body.input, [
+    {
+      type: "message",
+      role: "assistant",
+      content: [
+        { type: "output_text", text: "Previous assistant answer" },
+        { type: "scoped_content", scope: "internal", content: "Preserve me" },
+      ],
+    },
+    {
+      type: "message",
+      role: "user",
+      content: [
+        { type: "input_image", image_url: "https://example.com/image.png", detail: "high" },
+        { type: "input_file", file_id: "file_123" },
+      ],
+    },
+    { type: "function_call", call_id: "call_123", name: "lookup", arguments: "{}" },
+    { type: "function_call_output", call_id: "call_123", output: "done" },
+  ]);
+});
+
 test("Responses→Chat: null input normalizes to an empty list (not [null])", () => {
   assert.deepEqual(normalizeResponsesInputForChat(null), []);
 });