From a6d6e46b4cee6848a447f4ffc2b25cc8aa1b3132 Mon Sep 17 00:00:00 2001
From: Apunkt <a.schwibbe@gmx.net>
Date: Wed, 27 May 2026 16:58:50 +0200
Subject: [PATCH] Simplify session-init: only send SDK prompt, accept session
 title tradeoff

---
 deploy/opencode/iai-mcp-session-init.js | 32 ++++++++++++-------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/deploy/opencode/iai-mcp-session-init.js b/deploy/opencode/iai-mcp-session-init.js
index 1c49400..07adfbf 100644
--- a/deploy/opencode/iai-mcp-session-init.js
+++ b/deploy/opencode/iai-mcp-session-init.js
@@ -1,8 +1,8 @@
 /**
  * iai-mcp session-init plugin for OpenCode.
  *
- * Sets the system prompt via chat.message hook's UserMessage.system field.
- * This reaches the main agent and triggers memory_session_context on every session.
+ * Sends SDK prompt on session.updated to inject the system instruction.
+ * The model calls memory_session_context on every new session.
  */
 
 export const IaiMcpSessionInit = async ({
@@ -14,27 +14,25 @@ export const IaiMcpSessionInit = async ({
   serverUrl,
   $,
 }) => {
-  const injectedSessions = new Set();
+  const doneSessions = new Set();
 
   return {
     event: async ({ event }) => {
       if (event.type !== "session.updated") return;
       const sid = event.properties?.info?.id;
-      if (!sid || injectedSessions.has(sid)) return;
-      injectedSessions.add(sid);
-    },
+      if (!sid || doneSessions.has(sid)) return;
+      doneSessions.add(sid);
 
-    "chat.message": async (input, output) => {
-      const sid = input.sessionID;
-      if (!sid || !injectedSessions.has(sid)) return;
-      if (injectedSessions.has(`done-${sid}`)) return;
-
-      if (output.message) {
-        output.message.system =
-          "MANDATORY: Call `memory_session_context` (no arguments) BEFORE answering any user query.";
-      }
-
-      injectedSessions.add(`done-${sid}`);
+      try {
+        await client.session.prompt({
+          path: { id: sid },
+          body: {
+            system: "MANDATORY: Call `memory_session_context` (no arguments) BEFORE answering any user query.",
+            parts: [{ type: "text", text: "INIT" }],
+            noReply: false,
+          },
+        });
+      } catch {}
     },
   };
 };