Codex CLI 0.144.5 breaks subagent spawning for 'Sol' agent
A Codex CLI user reports that after updating to version 0.144.5, the agent named 'Sol' can no longer spawn subagents (helper AI instances that split up work). The multi_agent_v2 feature is enabled, and under the same setup two other agents, 'Terra' and 'Luna', work fine.
One day earlier, on CLI 0.144.4, Sol worked correctly and spawned three subagents; at that time its settings showed multi_agent_version as v2 and multi_agent_mode as explicitRequestOnly. On the broken version (0.144.5), multi_agent_version had reverted to v1 and multi_agent_mode was null, with no subagent-spawning tool or instructions present at all.
This points to an internal value getting silently changed during the CLI update, disabling the feature. Instead of spawning subagents, Sol tried to work around the gap using via .
Key points
- Codex CLI 0.144.5: agent 'Sol' fails to spawn subagents, while 'Terra' and 'Luna' work fine under the same setup
- One day prior (0.144.4), Sol worked correctly with multi_agent_version=v2 and mode=explicitRequestOnly
- On the broken version, multi_agent_version reverted to v1 and mode became null
- Subagent-spawning tools/instructions were entirely missing; Sol tried working around it with
- Poster is asking the community whether others are seeing the same