claude -p produces empty output despite model responding (v2.1.83)

Bug Description

claude -p (print/non-interactive mode) produces no output. The model responds correctly (visible in streaming output), but the final result field is empty, so nothing gets printed to stdout.

Steps to Reproduce

claude -p "say hello"
# No output, exit code 0

claude -p "say hello" --output-format json
# result field is empty: "result":""

Expected Behavior

The model's response should be printed to stdout.

Actual Behavior

No output. Exit code 0. The JSON output shows "result":"" with 13 output tokens consumed.

Diagnosis

Using --output-format stream-json --verbose reveals the model IS responding:

{"type":"assistant","message":{"content":[{"type":"text","text":"\n\nHello! How can I help you today?"}]}}

But the final result object has an empty result field:

{"type":"result","subtype":"success","is_error":false,"result":"","stop_reason":"end_turn",...}

The response exists in the stream but is not captured into the result field.

Additional details

• Tested with both Opus and Sonnet, same behavior
• Tested from different directories (~/.claude, /tmp), same behavior
• Tested with --output-format text and --output-format json, same behavior
• Exit code is always 0

Environment

• Claude Code version: 2.1.83 (latest as of 2026-03-26)
• Platform: macOS (Darwin 24.6.0)
• Shell: zsh
• Plugins installed: oh-my-claude-sisyphus, frontend-design, claude-notifications-go (disabled)