Imported from alreadydead0/aioMtproto (AGENTS.md). Install upstream with npx skills add alreadydead0/aioMtproto. Copyright stays with the author.

AGENTS.md

This file defines how coding agents should contribute to aiogram on dev-3.x.

Scope and defaults

• Base branch: dev-3.x
• Python: >=3.10
• Main tooling: uv, ruff, mypy, pytest, towncrier, butcher
• Keep diffs focused; avoid unrelated refactors/reformatting.

Setup

uv sync --all-extras --group dev --group test
uv run pre-commit install

Note: uv run pre-commit install writes hooks to the shared repository .git/hooks (common for all worktrees), not only for the current worktree.

Codebase Navigation

Use Serena MCP for all codebase navigation tasks. Serena provides semantic, symbol-aware tools that are more efficient than raw file reads:

• get_symbols_overview — list classes/methods in a file without reading the full body
• find_symbol — locate a specific class, method, or field by name path
• find_referencing_symbols — find all usages of a symbol across the codebase
• search_for_pattern — regex search when symbol names are unknown

Prefer Serena's symbol tools over Read/Grep for source code exploration. Only fall back to file-based tools when Serena is unavailable or for non-code files (JSON configs, Markdown, etc.).

Mandatory local checks before PR

Code style/lint in this repository is enforced via Ruff (ruff check + ruff format).

Quick loop (recommended for most PR iterations):

uv run ruff check --show-fixes --preview aiogram examples
uv run ruff format --check --diff aiogram tests scripts examples
uv run mypy aiogram
uv run pytest tests

Full loop (run before final review request):

# Run quick loop first, then:
uv run pytest --redis redis://<host>:<port>/<db> tests  # when Redis storage paths are affected
uv run pytest --mongo mongodb://<user>:<password>@<host>:<port> tests  # when Mongo storage paths are affected
uv run --extra docs bash -c 'cd docs && make html'  # when docs or generated API docs are affected

If changes touch Redis/Mongo storage behavior, run integration variants too:

uv run pytest --redis redis://<host>:<port>/<db> tests
uv run pytest --mongo mongodb://<user>:<password>@<host>:<port> tests

Run these only if you have accessible Redis/Mongo instances in your environment.

Changelog rules (CI-gated)

• Add CHANGES/<issue-or-pr>.<category>.rst unless PR has skip news label.
• Valid categories: feature, bugfix, doc, removal, misc.
• Changelog text must describe user-visible behavior changes, not process/org details.
• Do not edit CHANGES.rst directly for regular PRs.

Bot API/codegen workflow (critical)

aiogram API layers are generated. For Bot API related work:

• Prefer editing generator inputs (.butcher/**/*.yml, aliases, templates) instead of hand-editing generated code.
• Do not manually edit .butcher/**/entity.json (parser/codegen will overwrite it).
• For new shortcuts, add alias/config in .butcher and regenerate.
• Regeneration flow:

uv run --extra cli butcher parse
uv run --extra cli butcher refresh
uv run --extra cli butcher apply all

For maintainers preparing an API/version bump only:

make update-api args=patch

make update-api args=... also runs version bump scripts and updates version-related files (aiogram/__meta__.py, README.rst, docs/index.rst).

After regeneration, run lint/type/tests again.

Maintainer review signals (recent PRs)

These patterns repeatedly appeared in maintainer feedback and should be treated as hard constraints:

• Keep generation path consistent: shortcuts/features should be added through .butcher config + generation, not ad-hoc manual edits.
• Keep test style consistent with existing suite; avoid introducing new dependencies for small tests.
• Preserve framework contracts (e.g., dispatcher/workflow data passed to startup/shutdown callbacks).
• When fixing generated API metadata/docs, update the source mapping in .butcher so future regenerations keep the fix.

Documentation work

For docs changes:

uv run --extra docs sphinx-autobuild --watch aiogram/ --watch CHANGES.rst --watch README.rst docs/ docs/_build/

sphinx-autobuild is long-running by design.

Or quick build:

uv run --extra docs bash -c 'cd docs && make html'

PR quality checklist

Before requesting review:

1. Tests added/updated for behavior changes.
2. Local lint/type/tests pass.
3. Changelog fragment added (or skip news is justified).
4. If codegen-related: generated files and source config are both updated coherently.
5. PR body includes clear reproduction/validation steps.