fix(plugin): normalize event session ids

Handle OpenCode session events that carry the session ID under properties.info.id or properties.info.sessionID so background tasks and continuation hooks do not miss idle/error/delete events.

Add regression coverage for nested session.idle events completing background tasks and waking continuation hooks.

src/hooks/runtime-fallback/event-handler.ts

@@ -10,6 +10,7 @@ import { isAbortError } from "../../shared/is-abort-error"
 import { resolveFallbackBootstrapModel } from "./fallback-bootstrap-model"
 import { dispatchFallbackRetry } from "./fallback-retry-dispatcher"
 import { createSessionStatusHandler } from "./session-status-handler"
+import { resolveMessageEventSessionID, resolveSessionEventID } from "../../shared/event-session-id"
 
 export function createEventHandler(deps: HookDeps, helpers: AutoRetryHelpers) {
   const { config, pluginConfig, sessionStates, sessionLastAccess, sessionRetryInFlight, sessionAwaitingFallbackResult, sessionFallbackTimeouts, sessionStatusRetryKeys } = deps
@@ -30,7 +31,7 @@ export function createEventHandler(deps: HookDeps, helpers: AutoRetryHelpers) {
 
   const handleSessionCreated = (props: Record<string, unknown> | undefined) => {
     const sessionInfo = props?.info as { id?: string; model?: string } | undefined
-    const sessionID = sessionInfo?.id
+    const sessionID = resolveSessionEventID(props)
     const model = sessionInfo?.model
 
     if (sessionID && model) {
@@ -41,8 +42,7 @@ export function createEventHandler(deps: HookDeps, helpers: AutoRetryHelpers) {
   }
 
   const handleSessionDeleted = (props: Record<string, unknown> | undefined) => {
-    const sessionInfo = props?.info as { id?: string } | undefined
-    const sessionID = sessionInfo?.id
+    const sessionID = resolveSessionEventID(props)
 
     if (sessionID) {
       log(`[${HOOK_NAME}] Cleaning up session state`, { sessionID })
@@ -58,7 +58,7 @@ export function createEventHandler(deps: HookDeps, helpers: AutoRetryHelpers) {
   }
 
   const handleSessionStop = async (props: Record<string, unknown> | undefined) => {
-    const sessionID = props?.sessionID as string | undefined
+    const sessionID = resolveSessionEventID(props)
     if (!sessionID) return
 
     if (sessionRetryInFlight.has(sessionID) || sessionAwaitingFallbackResult.has(sessionID)) {
@@ -73,7 +73,7 @@ export function createEventHandler(deps: HookDeps, helpers: AutoRetryHelpers) {
 
   const handleMessageUpdated = (props: Record<string, unknown> | undefined) => {
     const info = props?.info as Record<string, unknown> | undefined
-    const sessionID = info?.sessionID as string | undefined
+    const sessionID = resolveMessageEventSessionID(props)
     const role = info?.role as string | undefined
     if (!sessionID || role !== "user") return
 
@@ -81,7 +81,7 @@ export function createEventHandler(deps: HookDeps, helpers: AutoRetryHelpers) {
   }
 
   const handleSessionIdle = (props: Record<string, unknown> | undefined) => {
-    const sessionID = props?.sessionID as string | undefined
+    const sessionID = resolveSessionEventID(props)
     if (!sessionID) return
 
     if (cancelledSessions.has(sessionID)) {
@@ -111,7 +111,7 @@ export function createEventHandler(deps: HookDeps, helpers: AutoRetryHelpers) {
   }
 
   const handleSessionError = async (props: Record<string, unknown> | undefined) => {
-    const sessionID = props?.sessionID as string | undefined
+    const sessionID = resolveSessionEventID(props)
     const error = props?.error
     const agent = props?.agent as string | undefined
 

src/hooks/runtime-fallback/message-update-handler.ts

@@ -8,6 +8,7 @@ import { getFallbackModelsForSession } from "./fallback-models"
 import { resolveFallbackBootstrapModel } from "./fallback-bootstrap-model"
 import { dispatchFallbackRetry } from "./fallback-retry-dispatcher"
 import { hasVisibleAssistantResponse } from "./visible-assistant-response"
+import { resolveMessageEventSessionID } from "../../shared/event-session-id"
 
 export { hasVisibleAssistantResponse } from "./visible-assistant-response"
 
@@ -17,7 +18,7 @@ export function createMessageUpdateHandler(deps: HookDeps, helpers: AutoRetryHel
 
   return async (props: Record<string, unknown> | undefined) => {
     const info = props?.info as Record<string, unknown> | undefined
-    const sessionID = info?.sessionID as string | undefined
+    const sessionID = resolveMessageEventSessionID(props)
     const timeoutEnabled = config.timeout_seconds > 0
     const eventParts = props?.parts as Array<{ type?: string; text?: string }> | undefined
     const infoParts = info?.parts as Array<{ type?: string; text?: string }> | undefined

src/hooks/runtime-fallback/session-status-handler.ts

@@ -8,6 +8,7 @@ import { getFallbackModelsForSession } from "./fallback-models"
 import { normalizeRetryStatusMessage, extractRetryAttempt } from "../../shared/retry-status-utils"
 import { resolveFallbackBootstrapModel } from "./fallback-bootstrap-model"
 import { dispatchFallbackRetry } from "./fallback-retry-dispatcher"
+import { resolveSessionEventID } from "../../shared/event-session-id"
 
 export function createSessionStatusHandler(
   deps: HookDeps,
@@ -22,7 +23,7 @@ export function createSessionStatusHandler(
   } = deps
 
   return async (props: Record<string, unknown> | undefined) => {
-    const sessionID = props?.sessionID as string | undefined
+    const sessionID = resolveSessionEventID(props)
     const status = props?.status as { type?: string; message?: string; attempt?: number } | undefined
     const agent = props?.agent as string | undefined
     const model = props?.model as string | undefined