fix(background-agent): inherit parent session directory for background tasks

Background tasks were defaulting to $HOME instead of the parent session's
working directory. This caused background agents to scan the entire home
directory instead of the project directory, leading to:
- High CPU/memory load from scanning unrelated files
- Permission errors on system directories
- Task failures and timeouts

The fix retrieves the parent session's directory before creating a new
background session and passes it via the query.directory parameter.

Files modified:
- manager.ts: Look up parent session directory in launch()
- call-omo-agent/tools.ts: Same fix for sync mode
- look-at/tools.ts: Same fix for look_at tool
- sisyphus-task/tools.ts: Same fix + interface update for directory prop
- index.ts: Pass directory to sisyphusTask factory

src/features/background-agent/manager.ts

@@ -75,11 +75,23 @@ export class BackgroundManager {
 
     await this.concurrencyManager.acquire(concurrencyKey)
 
+    const parentSession = await this.client.session.get({
+      path: { id: input.parentSessionID },
+    }).catch((err) => {
+      log(`[background-agent] Failed to get parent session: ${err}`)
+      return null
+    })
+    const parentDirectory = parentSession?.data?.directory ?? this.directory
+    log(`[background-agent] Parent dir: ${parentSession?.data?.directory}, using: ${parentDirectory}`)
+
     const createResult = await this.client.session.create({
       body: {
         parentID: input.parentSessionID,
         title: `Background: ${input.description}`,
       },
+      query: {
+        directory: parentDirectory,
+      },
     }).catch((error) => {
       this.concurrencyManager.release(concurrencyKey)
       throw error

src/index.ts

@@ -238,6 +238,7 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
   const sisyphusTask = createSisyphusTask({
     manager: backgroundManager,
     client: ctx.client,
+    directory: ctx.directory,
     userCategories: pluginConfig.categories,
     gitMasterConfig: pluginConfig.git_master,
   });

src/tools/call-omo-agent/tools.ts

@@ -145,11 +145,23 @@ async function executeSync(
     sessionID = args.session_id
   } else {
     log(`[call_omo_agent] Creating new session with parent: ${toolContext.sessionID}`)
+    const parentSession = await ctx.client.session.get({
+      path: { id: toolContext.sessionID },
+    }).catch((err) => {
+      log(`[call_omo_agent] Failed to get parent session:`, err)
+      return null
+    })
+    log(`[call_omo_agent] Parent session dir: ${parentSession?.data?.directory}, fallback: ${ctx.directory}`)
+    const parentDirectory = parentSession?.data?.directory ?? ctx.directory
+
     const createResult = await ctx.client.session.create({
       body: {
         parentID: toolContext.sessionID,
         title: `${args.description} (@${args.subagent_type} subagent)`,
       },
+      query: {
+        directory: parentDirectory,
+      },
     })
 
     if (createResult.error) {

src/tools/look-at/tools.ts

@@ -65,11 +65,19 @@ Be thorough on what was requested, concise on everything else.
 If the requested information is not found, clearly state what is missing.`
 
       log(`[look_at] Creating session with parent: ${toolContext.sessionID}`)
+      const parentSession = await ctx.client.session.get({
+        path: { id: toolContext.sessionID },
+      }).catch(() => null)
+      const parentDirectory = parentSession?.data?.directory ?? ctx.directory
+
       const createResult = await ctx.client.session.create({
         body: {
           parentID: toolContext.sessionID,
           title: `look_at: ${args.goal.substring(0, 50)}`,
         },
+        query: {
+          directory: parentDirectory,
+        },
       })
 
       if (createResult.error) {

src/tools/sisyphus-task/tools.ts

@@ -89,6 +89,7 @@ function resolveCategoryConfig(
 export interface SisyphusTaskToolOptions {
   manager: BackgroundManager
   client: OpencodeClient
+  directory: string
   userCategories?: CategoriesConfig
   gitMasterConfig?: GitMasterConfig
 }
@@ -113,7 +114,7 @@ export function buildSystemContent(input: BuildSystemContentInput): string | und
 }
 
 export function createSisyphusTask(options: SisyphusTaskToolOptions): ToolDefinition {
-  const { manager, client, userCategories, gitMasterConfig } = options
+  const { manager, client, directory, userCategories, gitMasterConfig } = options
 
   return tool({
     description: SISYPHUS_TASK_DESCRIPTION,
@@ -400,11 +401,19 @@ System notifies on completion. Use \`background_output\` with task_id="${task.id
       let syncSessionID: string | undefined
 
       try {
+        const parentSession = await client.session.get({
+          path: { id: ctx.sessionID },
+        }).catch(() => null)
+        const parentDirectory = parentSession?.data?.directory ?? directory
+
         const createResult = await client.session.create({
           body: {
             parentID: ctx.sessionID,
             title: `Task: ${args.description}`,
           },
+          query: {
+            directory: parentDirectory,
+          },
         })
 
         if (createResult.error) {