add session ID everywhere

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

@@ -16754,6 +16754,11 @@
               }
             ]
           },
+          "sessionId": {
+            "default": "",
+            "description": "Session id shared by threads that belong to the same session tree.",
+            "type": "string"
+          },
           "thread": {
             "$ref": "#/definitions/v2/Thread"
           }
@@ -17058,6 +17063,11 @@
               }
             ]
           },
+          "sessionId": {
+            "default": "",
+            "description": "Session id shared by threads that belong to the same session tree.",
+            "type": "string"
+          },
           "thread": {
             "$ref": "#/definitions/v2/Thread"
           }

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

@@ -14640,6 +14640,11 @@
             }
           ]
         },
+        "sessionId": {
+          "default": "",
+          "description": "Session id shared by threads that belong to the same session tree.",
+          "type": "string"
+        },
         "thread": {
           "$ref": "#/definitions/Thread"
         }
@@ -14944,6 +14949,11 @@
             }
           ]
         },
+        "sessionId": {
+          "default": "",
+          "description": "Session id shared by threads that belong to the same session tree.",
+          "type": "string"
+        },
         "thread": {
           "$ref": "#/definitions/Thread"
         }

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

@@ -2566,6 +2566,11 @@
         }
       ]
     },
+    "sessionId": {
+      "default": "",
+      "description": "Session id shared by threads that belong to the same session tree.",
+      "type": "string"
+    },
     "thread": {
       "$ref": "#/definitions/Thread"
     }

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

@@ -2566,6 +2566,11 @@
         }
       ]
     },
+    "sessionId": {
+      "default": "",
+      "description": "Session id shared by threads that belong to the same session tree.",
+      "type": "string"
+    },
     "thread": {
       "$ref": "#/definitions/Thread"
     }

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

@@ -9,7 +9,10 @@ import type { AskForApproval } from "./AskForApproval";
 import type { SandboxPolicy } from "./SandboxPolicy";
 import type { Thread } from "./Thread";
 
-export type ThreadResumeResponse = {thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: AbsolutePathBuf, /**
+export type ThreadResumeResponse = {/**
+ * Session id shared by threads that belong to the same session tree.
+ */
+sessionId: string, thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: AbsolutePathBuf, /**
  * Instruction source files currently loaded for this thread.
  */
 instructionSources: Array<AbsolutePathBuf>, approvalPolicy: AskForApproval, /**

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

@@ -9,7 +9,10 @@ import type { AskForApproval } from "./AskForApproval";
 import type { SandboxPolicy } from "./SandboxPolicy";
 import type { Thread } from "./Thread";
 
-export type ThreadStartResponse = {thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: AbsolutePathBuf, /**
+export type ThreadStartResponse = {/**
+ * Session id shared by threads that belong to the same session tree.
+ */
+sessionId: string, thread: Thread, model: string, modelProvider: string, serviceTier: ServiceTier | null, cwd: AbsolutePathBuf, /**
  * Instruction source files currently loaded for this thread.
  */
 instructionSources: Array<AbsolutePathBuf>, approvalPolicy: AskForApproval, /**

codex-rs/app-server-protocol/src/protocol/common.rs

@@ -2126,6 +2126,7 @@ mod tests {
         let response = ClientResponse::ThreadStart {
             request_id: RequestId::Integer(7),
             response: v2::ThreadStartResponse {
+                session_id: "67e55044-10b1-426f-9247-bb680e5fe0c7".to_string(),
                 thread: v2::Thread {
                     id: "67e55044-10b1-426f-9247-bb680e5fe0c8".to_string(),
                     forked_from_id: None,
@@ -2166,6 +2167,7 @@ mod tests {
                 "method": "thread/start",
                 "id": 7,
                 "response": {
+                    "sessionId": "67e55044-10b1-426f-9247-bb680e5fe0c7",
                     "thread": {
                         "id": "67e55044-10b1-426f-9247-bb680e5fe0c8",
                         "forkedFromId": null,

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

@@ -3638,6 +3638,9 @@ pub struct MockExperimentalMethodResponse {
 #[serde(rename_all = "camelCase")]
 #[ts(export_to = "v2/")]
 pub struct ThreadStartResponse {
+    /// Session id shared by threads that belong to the same session tree.
+    #[serde(default)]
+    pub session_id: String,
     pub thread: Thread,
     pub model: String,
     pub model_provider: String,
@@ -3752,6 +3755,9 @@ pub struct ThreadResumeParams {
 #[serde(rename_all = "camelCase")]
 #[ts(export_to = "v2/")]
 pub struct ThreadResumeResponse {
+    /// Session id shared by threads that belong to the same session tree.
+    #[serde(default)]
+    pub session_id: String,
     pub thread: Thread,
     pub model: String,
     pub model_provider: String,