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Haystack Guidelines for AI Agents

Environment

Haystack uses Hatch for environment and dependency management.

Do not run python or pip directly.

Before running code on this project, you must be able to run hatch --version and get a correct output.

If not, ask the user where Hatch is or if they want to install it. For installation instructions, refer to https://hatch.pypa.io/latest/install/#installation.

Run scripts with test dependencies

hatch -e test run python SCRIPT.py

Open a shell with test dependencies

hatch -e test shell

Install temporary dependencies (for experiments only)

uv pip install PACKAGE

Delete the environment

hatch env prune

Tests

Tests run via Hatch and support pytest arguments.

Prefer running tests on a specific module or using -k, since the full suite is large.

Run unit tests

hatch run test:unit

Run integration tests

hatch run test:integration

Quality Checks

Type checking with mypy

hatch run test:types

To fix type issues, avoid type: ignore, casts, or assertions when possible. If they are necessary, explain why.

Format and lint

hatch run fmt

Release Notes

Every user-facing PR (not docs, not CI) must include a release note:

hatch run release-note SHORT_DESCRIPTION

Edit the generated file in releasenotes/notes/.