core/.github/copilot-instructions.md

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# Copilot code review instructions

- Start review comments with a short, one-sentence summary of the suggested fix.
- Do not add comments about code style, formatting or linting issues.

# GitHub Copilot & Claude Code Instructions

This repository contains the core of Home Assistant, a Python 3 based home automation application.

## Git Commit Guidelines

- **Do NOT amend, squash, or rebase commits that have already been pushed to the PR branch after the PR is opened** - Reviewers need to follow the commit history, as well as see what changed since their last review

## Development Commands

.vscode/tasks.json contains useful commands used for development.

## Python Syntax Notes

- Python 3.14 explicitly allows `except TypeA, TypeB:` without parentheses. Never flag this as an issue since Home Assistant officially supports Python 3.14.

## Testing

When writing or modifying tests, ensure all test function parameters have type annotations.
Prefer concrete types (for example, `HomeAssistant`, `MockConfigEntry`, etc.) over `Any`.

## Good practices

Integrations with Platinum or Gold level in the Integration Quality Scale reflect a high standard of code quality and maintainability. When looking for examples of something, these are good places to start. The level is indicated in the manifest.json of the integration.

When reviewing entity actions, do not suggest extra defensive checks for input fields that are already validated by Home Assistant's service/action schemas and entity selection filters. Suggest additional guards only when data bypasses those validators or is transformed into a less-safe form.
When validation guarantees a dict key exists, prefer direct key access (`data["key"]`) instead of `.get("key")` so contract violations are surfaced instead of silently masked.


# Skills

- ha-integration-knowledge: .claude/skills/ha-integration-knowledge/SKILL.md