Task tool subagents hit rate limit immediately while main session works fine

Environment

• Claude Code 2.1.41, Desktop App (macOS)
• Max subscription
• Opus 4.6 main session

Behavior

• Main session (Opus 4.6) works without issues
• Any subagent spawned via Task tool instantly fails with API Error: Rate limit reached and total_tokens: 0
• Happens on ALL models: Sonnet 4.6, Haiku 4.5, Opus — doesn't matter
• total_tokens: 0 means the request is rejected before processing even starts
• No zombie processes, no parallel sessions — clean environment, same result

Steps to reproduce

1. Open Claude Code Desktop App with Opus 4.6
2. Have a working conversation (main session responds fine)
3. Call Task tool with any prompt, any model (sonnet/haiku/opus)
4. Instant Rate limit reached, 0 tokens consumed

Expected

Subagents should use the same auth/rate-limit bucket as the main session.

Actual

Subagents appear to open new connections that are immediately rate-limited, while the main session's established connection continues working.

Additional context

• Previously had zombie subagent processes (from crashed TeamCreate sessions) consuming rate limit in the background. Killed all of them, verified no extra processes — issue persists.
• The main session never hits rate limit, only spawned subagents do.