[BUG] - Claude thinks it spawns agents in parallel, but it doesn't

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude says it's dellegating parallel execution of sub agents across tasks, but it isn't. Here's an example:

<img width="908" height="734" alt="Image" src="https://github.com/user-attachments/assets/ff16848f-57c0-4b1a-abb6-2d63e11f6b32" />

I have to cancel and tell claude parallel execution isn't happening then Claude reruns and properly executes parallel sub agent executions. "You're Absolutely Right!"

What Should Happen?

Claude should launch the agents in parallel as suggested, not sequentially.

Error Messages/Logs

`Youre Absolutely Right!`

Steps to Reproduce

1. Assemble a task and delegation strategy with parallel subagent execution (same agent or different agents)
2. Observe claude try execute, but fail to initialize multiple parallel agents.
3. Interrupt claude and be reminded that "You're Absolutely Right!"
4. Tell Claude to launch parallel agents
5. Claude usually performs parallel execution successfully.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.0.110 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_