Return the prompt hash in upload responses (#44325)

## What changed

Add nullable `promptHash` to the upload response, populated from the uploaded `prompt_hash` tag. It identifies the whitespace-normalized SHA-256 of the session base instructions, excludes later developer messages, and is `null` when the reported rollout has no prompt metadata.

Update the protocol schemas, precomputed exports, and generated TypeScript and Python types.

GitOrigin-RevId: 6fa70fbe7a06604ac1cd0ea363eb4f192083dad9

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json

@@ -11502,6 +11502,14 @@
       "FeedbackUploadResponse": {
         "$schema": "http://json-schema.org/draft-07/schema#",
         "properties": {
+          "promptHash": {
+            "default": null,
+            "description": "Whitespace-normalized SHA-256 of the session base instructions, matching the uploaded `prompt_hash` tag. Does not include later developer messages. Null when the reported rollout has no prompt metadata.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
           "threadId": {
             "type": "string"
           }

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json

@@ -7402,6 +7402,14 @@
     "FeedbackUploadResponse": {
       "$schema": "http://json-schema.org/draft-07/schema#",
       "properties": {
+        "promptHash": {
+          "default": null,
+          "description": "Whitespace-normalized SHA-256 of the session base instructions, matching the uploaded `prompt_hash` tag. Does not include later developer messages. Null when the reported rollout has no prompt metadata.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
         "threadId": {
           "type": "string"
         }

codex-rs/app-server-protocol/schema/json/v2/FeedbackUploadResponse.json

@@ -1,6 +1,14 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "properties": {
+    "promptHash": {
+      "default": null,
+      "description": "Whitespace-normalized SHA-256 of the session base instructions, matching the uploaded `prompt_hash` tag. Does not include later developer messages. Null when the reported rollout has no prompt metadata.",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
     "threadId": {
       "type": "string"
     }

codex-rs/app-server-protocol/schema/typescript/v2/FeedbackUploadResponse.ts

@@ -2,4 +2,10 @@
 
 // This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 
-export type FeedbackUploadResponse = { threadId: string, };
+export type FeedbackUploadResponse = { threadId: string,
+/**
+ * Whitespace-normalized SHA-256 of the session base instructions, matching the
+ * uploaded `prompt_hash` tag. Does not include later developer messages.
+ * Null when the reported rollout has no prompt metadata.
+ */
+promptHash: string | null, };

codex-rs/app-server-protocol/src/protocol/v2/feedback.rs

@@ -27,4 +27,9 @@ pub struct FeedbackUploadParams {
 #[ts(export_to = "v2/")]
 pub struct FeedbackUploadResponse {
     pub thread_id: String,
+    /// Whitespace-normalized SHA-256 of the session base instructions, matching the
+    /// uploaded `prompt_hash` tag. Does not include later developer messages.
+    /// Null when the reported rollout has no prompt metadata.
+    #[serde(default)]
+    pub prompt_hash: Option<String>,
 }

codex-rs/app-server/src/request_processors/feedback_processor.rs

@@ -108,6 +108,7 @@ impl FeedbackRequestProcessor {
             None
         };
         apply_feedback_turn_metadata(&mut upload_tags, turn_metadata);
+        let prompt_hash = upload_tags.get("prompt_hash").cloned();
 
         if let Some(chatgpt_user_id) = auth
             .as_ref()
@@ -314,7 +315,10 @@ impl FeedbackRequestProcessor {
 
         upload_result
             .map_err(|err| internal_error(format!("failed to upload feedback: {err:#}")))?;
-        Ok(FeedbackUploadResponse { thread_id })
+        Ok(FeedbackUploadResponse {
+            thread_id,
+            prompt_hash,
+        })
     }
 
     async fn resolve_rollout_path(

sdk/python/src/openai_codex/generated/v2_all.py

@@ -1442,6 +1442,13 @@ class FeedbackUploadResponse(BaseModel):
     model_config = ConfigDict(
         populate_by_name=True,
     )
+    prompt_hash: Annotated[
+        str | None,
+        Field(
+            alias="promptHash",
+            description="Whitespace-normalized SHA-256 of the session base instructions, matching the uploaded `prompt_hash` tag. Does not include later developer messages. Null when the reported rollout has no prompt metadata.",
+        ),
+    ] = None
     thread_id: Annotated[str, Field(alias="threadId")]