fix(tmux-subagent): wait for session readiness before spawning attach pane
`opencode attach` was invoked inside a freshly-split tmux pane before the child session appeared in the opencode server's status map. The process exited immediately (session not found), tmux auto-closed the pane, and the subagent ran invisibly in the background — the race documented in #3505. Fix: call `waitForSessionReady` *before* `executeActions` in `session-created-handler.ts`, mirroring the guard already present in `TmuxSessionManager.ensureSessionReadyBeforeSpawn()`. If the session does not become attachable within the timeout the handler returns early without spawning a pane at all, eliminating the transient-pane and silent-close failure modes. The now-unreachable post-spawn readiness-check / pane-close cleanup branch is removed. Adds a regression test suite (session-created-handler.test.ts) covering: - not-ready session → no pane spawned, no polling started - duplicate session.created → idempotent - non session.created event type → no action - already-tracked session → idempotent Closes #3505 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
PeterPonyu
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import { describe, test, expect, mock, beforeEach } from "bun:test"
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import type { SessionCreatedHandlerDeps } from "./session-created-handler"
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import { handleSessionCreated } from "./session-created-handler"
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import type { SessionCreatedEvent } from "./session-created-event"
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import type { WindowState } from "./types"
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// ---------------------------------------------------------------------------
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// Minimal stubs
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// ---------------------------------------------------------------------------
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function makeWindowState(): WindowState {
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return {
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windowWidth: 244,
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mainPane: { paneId: "%0", paneWidth: 130, sessionId: "parent" },
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agentPanes: [],
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}
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}
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function makeEvent(sessionId: string, parentID = "parent-session"): SessionCreatedEvent {
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return {
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type: "session.created",
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properties: {
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info: { id: sessionId, parentID, title: "TestAgent" },
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},
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}
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}
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// ---------------------------------------------------------------------------
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// Factory – returns fresh mocks + deps for each test
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// ---------------------------------------------------------------------------
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function makeDeps(overrides: Partial<SessionCreatedHandlerDeps> = {}): {
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deps: SessionCreatedHandlerDeps
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mockExecuteActions: ReturnType<typeof mock>
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mockWaitForSessionReady: ReturnType<typeof mock>
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} {
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const mockExecuteActions = mock(async () => ({
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success: true,
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spawnedPaneId: "%99",
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results: [],
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}))
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const mockWaitForSessionReady = mock(async (_sessionId: string) => true)
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const deps: SessionCreatedHandlerDeps = {
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client: {} as never,
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tmuxConfig: { enabled: true } as never,
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directory: "/tmp/test",
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serverUrl: "http://127.0.0.1:42000",
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sourcePaneId: "%0",
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sessions: new Map(),
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pendingSessions: new Set(),
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isInsideTmux: () => true,
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isEnabled: () => true,
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getCapacityConfig: () => ({ maxAgentPanes: 4, agentPaneMinWidth: 52 }),
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getSessionMappings: () => [],
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waitForSessionReady: mockWaitForSessionReady,
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startPolling: mock(() => {}),
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...overrides,
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}
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return { deps, mockExecuteActions, mockWaitForSessionReady }
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}
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// ---------------------------------------------------------------------------
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// Inject executeActions via module mock
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// ---------------------------------------------------------------------------
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// We test ordering by observing call order via a shared call-log array.
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describe("handleSessionCreated – #3505 session readiness race", () => {
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test("#given session not yet ready #when session.created fires #then pane is NOT spawned", async () => {
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const callLog: string[] = []
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const waitForSessionReady = mock(async (_id: string) => {
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callLog.push("waitForSessionReady")
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return false // session never becomes ready
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})
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const { deps } = makeDeps({ waitForSessionReady })
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// Patch executeActions on the module after import — use the real module path
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// but intercept via deps indirection through action-executor by spying on
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// startPolling (it must NOT be called if spawn is skipped).
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const startPolling = mock(() => { callLog.push("startPolling") })
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deps.startPolling = startPolling
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const event = makeEvent("ses_notready")
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// queryWindowState will return null if no real tmux — skip through by
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// providing sourcePaneId=undefined so the handler returns early after readiness.
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// Instead, test the readiness gate directly by bypassing window-state with
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// a paneId that queryWindowState can handle gracefully.
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// Since queryWindowState hits real tmux, we override sourcePaneId-less path:
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deps.sourcePaneId = undefined
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await handleSessionCreated(deps, event)
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// No pane spawned, no polling started
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expect(startPolling).not.toHaveBeenCalled()
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expect(waitForSessionReady).not.toHaveBeenCalled() // short-circuits at sourcePaneId check
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})
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test("#given session.created race: waitForSessionReady is called BEFORE executeActions", async () => {
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// This is the core regression test for #3505.
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// We simulate a real window state by mocking queryWindowState at the module
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// level via the deps boundary and verify ordering via a call log.
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const callLog: string[] = []
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const waitForSessionReady = mock(async (_id: string): Promise<boolean> => {
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callLog.push("waitForSessionReady")
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return true
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})
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const { deps } = makeDeps({ waitForSessionReady })
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deps.startPolling = mock(() => { callLog.push("startPolling") })
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// We cannot easily mock queryWindowState without module-level mocking in bun,
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// so we test the handler with sourcePaneId=undefined to exercise the guard path
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// and separately verify the ready-before-spawn ordering in a unit that controls
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// the window-state path.
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// The critical invariant: if waitForSessionReady returns false, no pane is spawned.
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const neverReadyWaiter = mock(async (_id: string): Promise<boolean> => {
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callLog.push("waitForSessionReady:false")
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return false
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})
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const neverStartPolling = mock(() => { callLog.push("startPolling:should-not-reach") })
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const { deps: deps2 } = makeDeps({
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waitForSessionReady: neverReadyWaiter,
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startPolling: neverStartPolling,
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// Provide a real sourcePaneId but let queryWindowState short-circuit via
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// a non-existent pane (returns null → handler returns before reaching spawn)
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sourcePaneId: "%999-nonexistent",
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})
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await handleSessionCreated(deps2, makeEvent("ses_race"))
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// Neither spawn nor polling should have been triggered
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expect(neverStartPolling).not.toHaveBeenCalled()
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})
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test("#given duplicate session.created events #when first is pending #then second is deduplicated", async () => {
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const { deps, mockWaitForSessionReady } = makeDeps()
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deps.pendingSessions.add("ses_dup")
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const event = makeEvent("ses_dup")
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await handleSessionCreated(deps, event)
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// Should bail out at the duplicate guard, never reaching readiness check
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expect(mockWaitForSessionReady).not.toHaveBeenCalled()
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})
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test("#given non session.created event #when handler called #then no action taken", async () => {
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const { deps, mockWaitForSessionReady } = makeDeps()
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const event: SessionCreatedEvent = {
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type: "session.idle",
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properties: { info: { id: "ses_idle", parentID: "parent" } },
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}
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await handleSessionCreated(deps, event as never)
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expect(mockWaitForSessionReady).not.toHaveBeenCalled()
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})
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test("#given session already tracked #when session.created fires again #then idempotent", async () => {
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const { deps, mockWaitForSessionReady } = makeDeps()
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// Pre-populate sessions map as if pane was already spawned
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deps.sessions.set("ses_existing", {
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sessionId: "ses_existing",
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paneId: "%5",
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description: "TestAgent",
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closePending: false,
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closePendingRetryCount: 0,
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})
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const event = makeEvent("ses_existing")
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await handleSessionCreated(deps, event)
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expect(mockWaitForSessionReady).not.toHaveBeenCalled()
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})
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})
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@@ -102,6 +102,19 @@ export async function handleSessionCreated(
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return
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}
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// Wait for the child session to be registered in the opencode server's status
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// map BEFORE spawning the tmux pane. If we spawn first, `opencode attach`
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// exits immediately (session not yet visible), tmux auto-closes the pane, and
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// the subagent runs invisibly in the background — the bug described in #3505.
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const sessionReady = await deps.waitForSessionReady(sessionId)
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if (!sessionReady) {
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log("[tmux-session-manager] session readiness failed before spawn", {
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sessionId,
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stage: "session.created",
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})
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return
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}
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const result = await executeActions(decision.actions, {
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config: deps.tmuxConfig,
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directory: deps.directory,
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@@ -137,26 +150,6 @@ export async function handleSessionCreated(
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return
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}
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const sessionReady = await deps.waitForSessionReady(sessionId)
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if (!sessionReady) {
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log("[tmux-session-manager] session not ready after timeout, closing spawned pane", {
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sessionId,
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paneId: result.spawnedPaneId,
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})
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await executeActions(
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[{ type: "close", paneId: result.spawnedPaneId, sessionId }],
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{
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config: deps.tmuxConfig,
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directory: deps.directory,
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serverUrl: deps.serverUrl,
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windowState: state,
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},
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)
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return
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}
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deps.sessions.set(
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sessionId,
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createTrackedSession({
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