fix: serialize opencode lifecycle reports

refs #1519

1 files changed, 13 insertions, 2 deletions

diff --git a/src/integration/assets/opencode/herdr-agent-state.js b/src/integration/assets/opencode/herdr-agent-state.js
index 9a14b3c8..4d59f9ec 100644
--- a/src/integration/assets/opencode/herdr-agent-state.js
+++ b/src/integration/assets/opencode/herdr-agent-state.js
@@ -2,13 +2,15 @@
 // managed by herdr; reinstalling or updating the integration overwrites this file.
 // add custom hooks/plugins beside this file instead of editing it.
 // HERDR_INTEGRATION_ID=opencode
-// HERDR_INTEGRATION_VERSION=8
+// HERDR_INTEGRATION_VERSION=9
 
 import net from "node:net";
 
 const SOURCE = "herdr:opencode";
 const AGENT = "opencode";
 let reportSeq = Date.now() * 1000;
+let requestChain = Promise.resolve();
+let reportedRootSessionID;
 
 // Subagent (task tool) sessions carry a parentID; the main agent session does
 // not. Their lifecycle events would otherwise clobber the pane's real state, so
@@ -47,6 +49,12 @@ function stateFromSessionStatus(status) {
 }
 
 function request(method, params) {
+  const pending = requestChain.then(() => requestOnce(method, params));
+  requestChain = pending.catch(() => {});
+  return pending;
+}
+
+function requestOnce(method, params) {
   const paneId = process.env.HERDR_PANE_ID;
   const socketPath = process.env.HERDR_SOCKET_PATH;
 
@@ -101,6 +109,7 @@ function reportSession(sessionID, sessionStartSource) {
 function reportState(state, sessionID) {
   const params = { state };
   if (sessionID) {
+    reportedRootSessionID = sessionID;
     params.agent_session_id = sessionID;
   }
   return request("pane.report_agent", params);
@@ -160,7 +169,9 @@ export const HerdrAgentStatePlugin = async () => {
           await reportSession(sessionID, "new");
           break;
         case "session.updated":
-          await reportSession(sessionID);
+          if (sessionID && sessionID !== reportedRootSessionID) {
+            await reportSession(sessionID);
+          }
           break;
         case "session.status": {
           const state = stateFromSessionStatus(properties.status);