openclaw - 💡(How to fix) Fix Bug: sessions_spawn(mode="run", runtime="subagent") drops task payload

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When spawning a subagent using sessions_spawn(mode="run", runtime="subagent", task="..."), the task payload is dropped. The subagent boots empty.

Cron jobs with payload.kind="agentTurn" + sessionTarget="isolated" work correctly.

Root Cause

When spawning a subagent using sessions_spawn(mode="run", runtime="subagent", task="..."), the task payload is dropped. The subagent boots empty.

Cron jobs with payload.kind="agentTurn" + sessionTarget="isolated" work correctly.

Fix Action

Workaround

Use cron agentTurn instead.

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Target Component

openclaw/runtime/subagents (sessions_spawn with mode="run")

Description

When spawning a subagent using sessions_spawn(mode="run", runtime="subagent", task="..."), the task payload is dropped. The subagent boots empty.

Cron jobs with payload.kind="agentTurn" + sessionTarget="isolated" work correctly.

Evidence

  • 515 cron executions: all successful
  • 3/3 sessions_spawn attempts: all failed

Steps

  1. sessions_spawn(task="do X", runtime="subagent", mode="run")
  2. Subagent initializes with no instruction

Workaround

Use cron agentTurn instead.

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openclaw - 💡(How to fix) Fix Bug: sessions_spawn(mode="run", runtime="subagent") drops task payload