Frequent hangs when run from OpenClaw via background PTY

Environment

• Claude Code: v2.1.42
• Invocation: OpenClaw exec pty:true background:true
• Model: us.anthropic.claude-opus-4-6-v1 (Bedrock us-east-1)
• Runtime: EC2 t3.medium (4GB RAM), Amazon Linux 2023

Problem

Claude Code frequently hangs (no output) or gets killed (signal 9) when run from OpenClaw as background PTY process on complex tasks.

Reproduction

Working case (simple)

# From OpenClaw
exec pty:true background:true command:"source ~/.bashrc && claude -p 'Summarize package.json'"
# Output: Success after ~30 seconds

Failing case (complex)

# From OpenClaw
exec pty:true background:true command:"source ~/.bashrc && claude --max-turns 50 -p 'Analyze codebase architecture'"
# Result: No output for 8 minutes → signal 9 (SIGKILL)

Pattern

• ✅ Simple 1-turn tasks: OK
• ❌ Complex multi-turn analysis: hang or signal 9
• ❌ Large directory analysis: hang or signal 9

Logs

Process shows "running" but no output in process action:log:

Process still running (pid 577007).
(no output yet)

After 8-48 minutes: signal 9 (killed by OS, not Claude Code).

Questions

1. Does Claude Code buffer output until completion? (may explain "no output yet")
2. Memory usage on large codebase analysis?
3. Recommended flags for OpenClaw background PTY usage?

Workaround tried

• --dangerously-skip-permissions: no effect
• --max-turns N: still hangs
• Simple tasks only: works but defeats purpose

Expected

Either complete successfully or fail gracefully with error message, not silent hang.