Duplicate console output across multiple independent projects (macOS)

Description

Seeing duplicate/repeated console output when using the Claude Code CLI. This affects multiple independent projects on the same machine (not isolated to a single project's configuration), which points to a platform-level regression rather than a project-specific hook or settings issue.

Environment

• OS: macOS (Darwin 25.3.0)
• Claude Code version: 2.1.119
• Affected projects: Multiple independent projects (cross-project, not config-specific)
• CLAUDE_CODE_NO_FLICKER set: No — already ruled out as the cause

Symptom

Console output is duplicated/repeated during Claude Code CLI sessions. The duplication appears consistently across different projects, confirming it is not caused by per-project hooks, settings.json configuration, or CLAUDE_CODE_NO_FLICKER.

Related Issues

This issue is filed to add volume signal to the existing tracker. Related open issues:

• #46597 — Duplicate banner + repeated messages in a single session (v2.1.101, macOS)
• #50689 — Duplicated lines in file generation (Opus 4.7, Apr 2026)
• #42703 — CLAUDE_CODE_NO_FLICKER causes duplicated output (Windows)

The cross-project nature of this report (same behavior on macOS across independent workspaces with different configs) suggests a platform-level regression affecting multiple users.