diff --git a/src/features/tmux-subagent/manager.ts b/src/features/tmux-subagent/manager.ts
index 3f9ca54e7..be6f5d808 100644
--- a/src/features/tmux-subagent/manager.ts
+++ b/src/features/tmux-subagent/manager.ts
@@ -77,6 +77,13 @@ const FAILED_READINESS_SWEEP_INTERVAL_MS = 60 * 1000
 const MAX_DEFERRED_QUEUE_SIZE = 20
 const MAX_CLOSE_RETRY_COUNT = 3
 const MAX_ISOLATED_CONTAINER_NULL_STATE_COUNT = 2
+let nextIsolatedSessionManagerId = 1
+
+function createIsolatedSessionManagerId(): string {
+  const managerId = String(nextIsolatedSessionManagerId)
+  nextIsolatedSessionManagerId += 1
+  return managerId
+}
 
 export class TmuxSessionManager {
   private client: OpencodeClient
@@ -102,6 +109,7 @@ export class TmuxSessionManager {
   private isolatedContainerNullStateCount = 0
   private staleSweepCompleted = false
   private staleSweepInProgress = false
+  private isolatedSessionManagerId = createIsolatedSessionManagerId()
   constructor(ctx: PluginInput, tmuxConfig: TmuxConfig, deps: Partial<TmuxUtilDeps> = {}) {
     this.client = ctx.client
     this.tmuxConfig = tmuxConfig
@@ -197,7 +205,16 @@ export class TmuxSessionManager {
     this.deps.log("[tmux-session-manager] creating isolated tmux container", { isolation, sessionId, title })
 
     const result = isolation === "session"
-      ? await spawnTmuxSession(sessionId, title, this.tmuxConfig, this.serverUrl, this.projectDirectory, this.sourcePaneId)
+      ? await spawnTmuxSession(
+        sessionId,
+        title,
+        this.tmuxConfig,
+        this.serverUrl,
+        this.projectDirectory,
+        this.sourcePaneId,
+        undefined,
+        this.isolatedSessionManagerId,
+      )
       : await spawnTmuxWindow(sessionId, title, this.tmuxConfig, this.serverUrl, this.projectDirectory)
 
     if (result.success && result.paneId) {
@@ -1322,7 +1339,7 @@ export class TmuxSessionManager {
     this.isolatedWindowPaneId = undefined
 
     if (this.tmuxConfig.isolation === "session") {
-      const isolatedSessionName = getIsolatedSessionName()
+      const isolatedSessionName = getIsolatedSessionName(process.pid, this.isolatedSessionManagerId)
       try {
         const killed = await killTmuxSessionIfExists(isolatedSessionName)
         this.deps.log("[tmux-session-manager] isolated session teardown", {
diff --git a/src/shared/tmux/tmux-utils/session-spawn.ts b/src/shared/tmux/tmux-utils/session-spawn.ts
index 27f68cc07..11ca8e07a 100644
--- a/src/shared/tmux/tmux-utils/session-spawn.ts
+++ b/src/shared/tmux/tmux-utils/session-spawn.ts
@@ -32,8 +32,10 @@ async function resolveSpawnTmuxSessionDeps(deps?: Partial<SpawnTmuxSessionDeps>)
 	}
 }
 
-export function getIsolatedSessionName(pid: number = process.pid): string {
-	return `${ISOLATED_SESSION_NAME_PREFIX}-${pid}`
+export function getIsolatedSessionName(pid: number = process.pid, managerId?: string): string {
+	return managerId
+		? `${ISOLATED_SESSION_NAME_PREFIX}-${pid}-${managerId}`
+		: `${ISOLATED_SESSION_NAME_PREFIX}-${pid}`
 }
 
 async function getWindowDimensions(
@@ -64,6 +66,7 @@ export async function spawnTmuxSession(
 	_directory: string,
 	sourcePaneId?: string,
 	depsInput?: Partial<SpawnTmuxSessionDeps>,
+	managerId?: string,
 ): Promise<SpawnPaneResult> {
 	const deps = await resolveSpawnTmuxSessionDeps(depsInput)
 	const { log, runTmuxCommand } = deps
@@ -108,7 +111,7 @@ export async function spawnTmuxSession(
 		}
 	}
 
-	const isolatedSessionName = getIsolatedSessionName()
+	const isolatedSessionName = getIsolatedSessionName(process.pid, managerId)
 	const sessionAlreadyExists = await sessionExists(tmux, isolatedSessionName, runTmuxCommand)
 
 	const args = sessionAlreadyExists