Enhancement: Add --quiet mode for minimal output

Enhancement Request: Add --quiet Mode for Minimal Output

Summary

Add a --quiet flag to suppress all narration and commentary, showing only tool calls and results.

Motivation

Power users running multi-step workflows want to see tool execution logs without explanatory narration. Current output includes unnecessary commentary before/after tool calls that clutters the terminal.

Proposed Solution

Option 1: CLI Flag

claude --quiet
# or
claude -q

Option 2: Setting

{
  "alwaysThinkingEnabled": false,
  "quietMode": true
}

Option 3: Permission Mode

claude --permission-mode quiet

Expected Behavior

Current (verbose):

⏺ I'll complete loading the context from the previous session...

⏺ Read(.aget/version.json)
  ⎿  Read 68 lines

⏺ I can see the previous session created documentation...

⏺ Bash(git status)
  ⎿  On branch main

⏺ Wind down complete.

Proposed (quiet):

⏺ Read(.aget/version.json)
  ⎿  Read 68 lines

⏺ Bash(git status)
  ⎿  On branch main

Scope

In quiet mode, suppress:

• Pre-action narration ("I'll...", "Let me...")
• Post-action commentary ("Wind down complete", "I can see...")
• Status updates between tool calls

Retain:

• Tool call logs (essential for transparency)
• Error explanations (when tools fail)
• Direct answers to user questions
• Final summaries when explicitly requested

Use Cases

• Automated workflows / CI/CD integration
• Power users familiar with tool patterns
• Terminal sessions with limited screen space
• Situations where token efficiency is critical

Alternative

Add to system instructions: "In default mode, suppress all narration around tool calls unless user explicitly requests explanations."

Related

• Issue #9128 (excessive narration bug report)
• Existing system instruction: "minimize output tokens as much as possible"