# Review Comment

- **Author:** coderabbitai[bot]
- **File:** `packages/core/ai_content_pipeline/ai_content_pipeline/cli/stream.py`
- **Line:** 108
- **Date:** 2026-02-07
- **Comment ID:** 2777111276
- **URL:** https://github.com/donghaozhang/video-agent-skill/pull/20#discussion_r2777111276

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_⚠️ Potential issue_ | _🟠 Major_

**Add return type hints and full Google-style docstrings to public emitter methods.**

Please add explicit return type hints (e.g., `-> None`) for all public methods and update docstrings to Google style with Args/Returns/Cost/Example sections.

As per coding guidelines: “All public methods in generator classes and test files must include type hints for parameters and return values”, “All public methods should include docstrings with Args, Returns, Cost information, and Example sections”, and “Write docstrings for every function using Google style format”.

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In `@packages/core/ai_content_pipeline/ai_content_pipeline/cli/stream.py` around
lines 24 - 108, Add explicit return type hints (-> None) to all public methods
on StreamEmitter and NullEmitter (pipeline_start, step_start, step_complete,
step_error, pipeline_complete) and convert their current docstrings to
Google-style docs including Args and Returns sections (and Cost/Example where
applicable) while leaving the private helper _emit unchanged; update
StreamEmitter.pipeline_complete docstring to note it writes to stdout and
include Args/Returns, and ensure all signatures in both classes include the type
hints to satisfy the generator class rule.
```

</details>

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