Task tool accepts parent session ID as task_id, causing silent deadlock

[RuLdaYu]

Description

Description

The task tool does not validate whether the provided task_id references the caller's own session. When the current session's own ID is passed as task_id, the tool "succeeds" and spawns a subagent, but that subagent is actually a self-reference — creating a circular deadlock where the subagent waits for the parent and the parent waits for the subagent, resulting in an infinite hang.

Suggested Fixes

1. Add a validation at the Task tool entry point: reject if task_id equals the current session ID
2. Follow the approach from PR feat: nested sub-agent spawning (up to 5 levels) + fixes for #23091 / #13715 #32301 — restrict task_id resume to direct children only (matching parentID in the session tree)

Plugins

opencode-subagent-magazine@latest

OpenCode version

1.18.3

Steps to reproduce

Steps to Reproduce

1. Obtain the current session's own ID (e.g. ses_xxxx...)
2. Call the task tool with task_id set to the current session's ID
3. Observe — the tool returns "success", but the subagent stays in "running" state indefinitely
4. The subagent never completes and cannot be cancelled normally

Screenshot and/or share link

Share link

opencode share

Operating System

windows11

Terminal

powershell