## Task

Evaluate this code review comment. Read the source file and determine if the issue is valid.

**Instructions:**
1. Read the file mentioned in the review: `issues/completed/subtask-3-stdin-stdout.md`
2. Check line 56 and surrounding context
3. Determine if the review feedback is valid
4. If valid: Fix the issue in the code
5. If invalid: Explain why the feedback doesn't apply

**Important:** Be concise. Either fix the code or explain in 2-3 sentences why it's not applicable.

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# Review Comment

- **Author:** coderabbitai[bot]
- **File:** `issues/completed/subtask-3-stdin-stdout.md`
- **Line:** 56
- **Date:** 2026-02-07
- **Comment ID:** 2777124699
- **URL:** https://github.com/donghaozhang/video-agent-skill/pull/20#discussion_r2777124699

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_⚠️ Potential issue_ | _🟡 Minor_

**Documentation inconsistency: code example doesn't match implementation summary.**

The implementation summary (lines 11-12) states that `read_input()` "Raises `ValueError` for TTY stdin" and "Raises `FileNotFoundError` for missing files" with mapping via the exit_codes module. However, the code example shows direct `sys.exit()` calls:

- Line 47: `sys.exit(2)` instead of raising `ValueError`
- Line 53: `sys.exit(3)` instead of raising `FileNotFoundError`

This contradicts the centralized error handling approach mentioned in the PR objectives. The code example should raise exceptions that the CLI layer catches and maps to exit codes.
