Source Seam Invariants

Prevent regressions during Rust refactoring by identifying and locking exact production call-site invariants. This Skill extracts required arguments, guards, and filters at critical seams, then asserts those textual patterns in tests to ensure pivotal logic remains intact across migrations.

Production seams are critical call sites where specific arguments, guards, and filters must remain intact. You need to guard them during cross-platform Rust migrations or refactors to prevent unintended widening of production behavior and ensure refactor safety.

Assert invariants at Rust call sites by performing explicit production file analysis to extract the smallest necessary patterns, then documenting and testing explicit guard and assert patterns against those exact textual invariants to lock the required behavior.

Yes, source seam invariants apply directly to cross-platform Rust codebases where production behavior must be preserved across refactors. The process captures required arguments and filters at pivotal call sites to validate refactor safety during migrations.

Validate refactor safety by locking specific production patterns against unintended widening through invariant extraction. Capture exact textual invariants at call sites and apply explicit guard and assert patterns that are documented and tested to keep branches intact.

Refactored Rust functions break production behavior when call-site invariants widen unintentionally. Locking the smallest necessary required arguments, guards, and filters through explicit assert patterns prevents these regressions when standard tests fail to catch textual pattern changes.