polylith-migrate-definition-of-done

Productivity

[Internal sub-skill of `polylith-migrate-orchestrator`. Do not load directly — load `polylith-migrate-orchestrator` first, which drives all phases.] Define the criteria for completing the migration process.

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Source SKILL.md: https://github.com/DavidVujic/python-polylith/blob/HEAD/.agents/skills/polylith/migrate-project/polylith-migrate-definition-of-done/SKILL.md

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Skill: polylith-migrate-definition-of-done

Done When

Structure

Temporary migration base is gone or thin.
Bases contain only entrypoints/wiring.
All non-entrypoint code lives in components.

Source Project

projects/<PROJECT>/ contains only:
- Packaging config (pyproject.toml).
- Runner scripts and task runners (Makefile, Justfile).
- Project-specific config (e.g., alembic.ini).
Project pyproject.toml references all required bricks.
Brick names are meaningful and non-generic.
Base names are project-prefixed to avoid collisions.

Tests

Tests are moved from projects/<PROJECT>/tests/ to workspace level (required).
Unit-test layout — one of the following (see polylith-migrate-refactor-tests):
- Per-brick (theme-aligned): loose → test/bases/<TARGET_TOP_NS>/<base>/ and test/components/<TARGET_TOP_NS>/<component>/; tdd → bases/<base>/test/<TARGET_TOP_NS>/<base>/ and components/<component>/test/<TARGET_TOP_NS>/<component>/. Or
- Workspace-level service dir test/<svc>_service/ — valid when shared test helpers can't cheaply become fixtures (the namespace-merge hazard makes a per-brick split unsafe otherwise). Record the chosen layout in state.md.
Integration tests live in a shared location (e.g., test/integration/ or test/<svc>_service/integration/).
Shared fixtures live in a conftest.py (e.g. test/<TARGET_TOP_NS>/conftest.py, test/conftest.py, or the service dir's conftest.py).
RUN_TEST_CMD points to the test root and collects the same number of tests as the pre-migration baseline.

Infrastructure

Infrastructure folders are moved to infra/<folder>/<project-name>/, or the move is deferred with a documented rationale in state.md when the deploy cannot be verified in the migration environment (see polylith-migrate-prepare-project). Either way, alembic/ stays with alembic.ini in the project.

Interfaces

Each component defines its public API via __init__.py.
Bricks import each other via those APIs.

Linting and Type-Checking

Linting/formatting and type-checking use the workspace's configured tool(s).
RUN_LINT_CMD and RUN_TYPECHECK_CMD pass if set. They may be intentionally empty when the project's pre-migration baseline already failed these gates (recorded in polylith-migrate-discover); pre-existing violations are not the migration's responsibility — note them as a follow-up rather than blocking the migration.

Dependencies

Workspace root pyproject.toml contains all third-party dependencies with version constraints.
Project pyproject.toml lists runtime dependencies without version numbers.

Cleanup

Migration artifacts (migration/<PROJECT>/state.md, migration/<PROJECT>/manifest.md, and any migration/shims.md) are either removed or kept under migration/<PROJECT>/ for reference (user's choice).
The migration branch (GIT_BRANCH from state.md) is ready to be merged or rebased into the main branch. Per-phase commits remain available for review/bisect.

End-to-end checks

These checks go beyond per-phase verification and exercise the migrated project as a whole. Both must pass.

1. Baseline test count restored

Compare collected test count to the baseline recorded by polylith-migrate-discover:

<RUN_TEST_CMD_with --collect-only -q | tail -1>

The count must equal the baseline. A lower count means pytest discovery is misconfigured (see polylith-migrate-refactor-tests failure modes). A higher count means tests were inadvertently duplicated during the move.

2. No undocumented shims remain

Inspect migration/<PROJECT>/shims.md (if it exists):

Empty or absent → ✅ proceed.
Lists active shims → either remove them now (rewrite imports to the new namespace and delete the shim modules) or schedule their removal as a follow-up PR and reference that PR in the migration branch description. Do not merge with undocumented shims.

Verify

RUN_TEST_CMD succeeds.
If set, RUN_LINT_CMD and RUN_TYPECHECK_CMD succeed.
Run POLY_CMD_PREFIX check to validate the workspace structure.
Run POLY_CMD_PREFIX info to inspect the workspace and confirm all projects and bricks are correctly registered.

Common failure modes

Symptom	Likely cause	Remediation
`RUN_TEST_CMD` passes but collected test count is lower than the baseline from `polylith-migrate-discover`	`pytest` discovery is misconfigured after the test reorganisation.	Update `[tool.pytest.ini_options].testpaths` (or pass paths explicitly in `RUN_TEST_CMD`). Run `pytest --collect-only` and diff against baseline collection. See `polylith-migrate-refactor-tests` for details.
`poly check` is green and tests pass, but a base imports something that no longer exists at the expected path	Entrypoint wiring regression introduced while moving code into bases/components.	Verify each base's entrypoint module imports cleanly and that its wiring matches the original. Revisit `polylith-migrate-distribute-wiring`.
`migration/shims.md` still lists active shims	Shims from `polylith-migrate-extract-to-base` (namespace change) were never removed.	Either rewrite imports to the new namespace and delete the shims, or schedule shim removal as a follow-up PR and note it in the migration branch description. Do not merge with undocumented shims.

Commit

After verification passes, commit this phase to the migration branch:

git add -A && git commit -m "migrate(<PROJECT>): phase <N> — definition-of-done"

Substitute <PROJECT>, <N>, and <phase-name> from state.md and the orchestrator's phase table. Do not proceed to the next phase without a clean commit — the per-phase commit is the rollback point for the next phase's failure-mode tables.