diff --git a/index.ts b/index.ts
index 687c67e..e797aad 100644
--- a/index.ts
+++ b/index.ts
@@ -159,10 +159,9 @@ async function runPlugin(ctx: any, options: any, dataDir: string) {
       if (!opencodeSessionId) {
         log(`Creating new OpenCode session for ${roomId}:${threadRootId}`)
         try {
-          const encodedId = `${roomId}:${threadRootId}`
-          const createResult = await ctx.session.create({ id: encodedId, title: `Matrix: ${roomId.slice(0, 30)}...` })
-          opencodeSessionId = createResult?.id || createResult?.data?.id || encodedId
-          log(`Created OpenCode session ${opencodeSessionId} (ID: ${encodedId})`)
+          const createResult = await ctx.session.create({ title: `Matrix: ${roomId.slice(0, 30)}...` })
+          opencodeSessionId = createResult?.id || createResult?.data?.id
+          log(`Created OpenCode session ${opencodeSessionId} for ${roomId}:${threadRootId}`)
           session.opencodeSessionId = opencodeSessionId
           sessionManager.saveSession(roomId, threadRootId, opencodeSessionId)
           sessionContextMap.set(opencodeSessionId, { roomId, threadRootId, context })