Validate Before Commit

Do not declare a task done until the full validation sequence has passed. Run these checks proactively — do not wait for the human to ask.

Standard sequence

# 1. Linting, formatting, and basic static checks
uv run pre-commit run --all-files

# 2. Type checking
uv run mypy <package_or_src_dir>

# 3. Infrastructure plan (if Pulumi files were changed)
pulumi preview --stack <stack-name>

Rules

• Run pre-commit before mypy; pre-commit may auto-fix formatting that would otherwise produce mypy noise.
• If pre-commit auto-fixes files, stage the changes and re-run pre-commit to confirm all hooks pass cleanly.
• mypy errors are blocking — do not leave type errors for the human to clean up.
• pulumi preview output must be reviewed: unexpected replacements or deletions are bugs, not acceptable side effects.

For Dagster / dg changes

After modifying assets, sensors, or code location structure, also confirm the workspace loads cleanly:

dg check

Interpreting failures

Read the full error output before proposing a fix. Do not apply a speculative patch without understanding the root cause — iterating blindly on the same error multiple times is worse than pausing to diagnose.