feat: fork codex threads

local-agent/codex-app-server-runner.mjs

@@ -82,6 +82,10 @@ function isThreadMetadataSyncTask(task) {
   return task?.intentCategory === "thread_metadata_sync" || task?.taskType === "thread_metadata_sync";
 }
 
+function isThreadForkTask(task) {
+  return task?.intentCategory === "thread_fork" || task?.taskType === "thread_fork";
+}
+
 function resolveThreadRenameName(task) {
   return trimToDefined(task?.threadRenameName || task?.threadName || task?.name);
 }
@@ -127,6 +131,10 @@ function resolveThreadMetadataGitInfo(task) {
   return Object.keys(gitInfo).length > 0 ? gitInfo : undefined;
 }
 
+function resolveThreadForkEphemeral(task) {
+  return task?.threadForkEphemeral === true || task?.ephemeral === true;
+}
+
 function resolveThreadLifecycleAction(task) {
   if (
     task?.threadLifecycleAction === "archive" ||
@@ -3229,6 +3237,42 @@ export async function executeCodexAppServerTask(runnerConfig, task) {
       };
     }
 
+    if (isThreadForkTask(task)) {
+      const forkSourceThreadId = targetThreadRef;
+      const ephemeral = resolveThreadForkEphemeral(task);
+      if (!forkSourceThreadId) {
+        throw new Error("CODEX_APP_SERVER_THREAD_ID_MISSING");
+      }
+      const forkResponse = await request("thread/fork", {
+        threadId: forkSourceThreadId,
+        ephemeral,
+      });
+      const forkedThread = forkResponse?.thread && typeof forkResponse.thread === "object"
+        ? forkResponse.thread
+        : {};
+      const forkedThreadId = trimToDefined(forkedThread.id);
+      return {
+        status: "completed",
+        replyBody: forkedThreadId
+          ? `已分叉 Codex 线程：${forkedThread.name || forkedThreadId}。`
+          : "已分叉 Codex 线程。",
+        threadId: forkSourceThreadId,
+        turnControl: "fork",
+        threadFork: {
+          sourceThreadId: forkSourceThreadId,
+          forkedThreadId,
+          forkedThreadName: trimToDefined(forkedThread.name),
+          forkedThreadPreview: trimToDefined(forkedThread.preview),
+          ephemeral: forkedThread.ephemeral === true,
+          status: trimToDefined(forkedThread.status),
+        },
+        cwd,
+        transport: runnerConfig.transport,
+        executionProgress: progressCollector.snapshot(),
+        canFallbackToCli: false,
+      };
+    }
+
     if (isThreadRenameTask(task)) {
       const renameThreadId = targetThreadRef;
       const name = resolveThreadRenameName(task);