# Privacy
## Data Stays Local
cqs processes your code locally by default. With `--llm-summaries`, function code is sent to Anthropic's API for one-sentence summary generation. With `--improve-docs`, LLM-generated doc comments are written back to your source files. With `--hyde-queries`, function descriptions are sent to Anthropic's API for synthetic search query generation. See [Anthropic's privacy policy](https://www.anthropic.com/privacy). Without these flags, nothing is transmitted externally and no source files are modified.
- **No telemetry by default**: Optional local-only command logging when `CQS_TELEMETRY=1` is set. Stored in `.cqs/telemetry.jsonl`, never transmitted
- **No analytics**: No tracking of any kind
- **No cloud sync**: Index stays in your project directory
## What Gets Stored
When you run `cqs index`, the following is stored in `.cqs/index.db`:
- Code chunks (functions, methods, documentation sections)
- Embedding vectors (dimension depends on configured model; 1024 for BGE-large default, 768 for E5-base/v9-200k presets)
- File paths and line numbers
- File modification times
This data never leaves your machine.
## Model Download
The embedding model is downloaded once from HuggingFace:
- Default: `BAAI/bge-large-en-v1.5` (BGE-large, ~1.2GB, 1024-dim)
- Preset: `intfloat/e5-base-v2` (E5-base, ~438MB, 768-dim)
- Preset: `jamie8johnson/e5-base-v2-code-search` (v9-200k LoRA, ~417MB, 768-dim)
- Custom: any HuggingFace repo via `[embedding]` config section, `--model` CLI flag, or `CQS_EMBEDDING_MODEL` env var
- Size varies by model
- Cached in: `~/.cache/huggingface/`
HuggingFace may log download requests per their privacy policy. Custom model configurations cause downloads from the specified HuggingFace repository. After download, the model runs offline.
## CI/CD
If you fork or contribute to the cqs repository:
- GitHub Actions runs tests on push/PR
- Code is processed on GitHub-hosted runners
- No index data is uploaded (only source code)
- See GitHub's privacy policy for runner data handling
## Deleting Your Data
To remove all cqs data:
```bash
rm -rf .cqs/ # Project index
rm -rf ~/.local/share/cqs/refs/ # Reference indexes
rm -rf ~/.config/cqs/projects.toml # Project registry
rm -f ~/.config/cqs/config.toml # User configuration
rm -f .cqs.toml # Project config
rm -f docs/notes.toml # Project notes
rm -rf ~/.cache/huggingface/ # Downloaded model
```