dev-workflow

Development

Use when setting up the FastStream dev environment, running tests/linters/static analysis, managing docker brokers, or preparing a PR.

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Source SKILL.md: https://github.com/ag2ai/faststream/blob/HEAD/.agents/skills/dev-workflow/SKILL.md

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FastStream Dev Workflow

Toolchain

uv for Python deps + just as the task runner + docker compose for brokers. Never use bare pip. Run just with no args to list all recipes.

just init [python-version] — build the dev environment (default Python 3.10).

Docker brokers

just up / just stop / just down — start / stop / remove all containers (brokers + the faststream dev container the test recipes exec into).
Per broker: just kafka-up, rabbit-up, nats-up, redis-up, redis-cluster-up (+ matching -stop and -logs recipes). MQTT has no local just recipes — it is tested in CI only.

Test matrix

All just test* recipes execute inside the dev container (docker compose exec faststream) — run just up first.

Command	Selection
`just test [path]`	fast: `not slow and not connected`, parallel `-n auto`
`just test-all [path]`	full suite (`-m "all"`) — all brokers must be up
`just test-<broker> [path]`	broker-marked tests excluding `connected` and `slow` (kafka, confluent, rabbit, redis, redis-cluster, nats)
`just test-<broker>-all [path]`	every broker-marked test incl. slow/connected — needs that broker up
`just test-coverage [path]` / `test-coverage-all`	with coverage

Extra pytest args pass through: just test tests/brokers/kafka -vv. Run pytest directly when needed (uv run pytest ... — no container required, but bare pytest excludes only slow by default) — never via the rtk proxy.

Lint & static analysis (run before any PR, in this order)

just linter — runs ruff format (rewrites files in place), then ruff check --exit-non-zero-on-fix (reports fixable issues without applying them), then codespell (alias: just lint). Expect formatting changes in your working tree after running it.
just mypy — strict mode over faststream/ and tests/mypy/.
just static-analysis — mypy + bandit + semgrep; just zizmor separately for GitHub Actions workflows.
just pre-commit — pre-commit hooks on modified files (just pre-commit-all for the whole tree).

Docs recipes

just docs-serve — live server; just docs-build — static build (details in the documentation-writing skill).

CI expectations

CI (.github/workflows/pr_tests.yaml): core jobs run everything except connected (-m "(slow and not connected) or not connected"); per-broker jobs run <broker> and not connected, plus dedicated jobs with real broker services for connected tests.
30s per-test timeout; xdist parallelism — tests must be order-independent.
Coverage sources include faststream/, tests/, docs/docs_src/, and examples/.

Related skills

testing-patterns — markers, base testcases, fixtures.
code-architecture — source conventions the linters enforce.
documentation-writing — docs authoring and snippet testing.

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