test-safety-net

The key words MUST, MUST NOT, SHOULD, SHOULD NOT and MAY in this skill are to be interpreted as described in BCP 14 (RFC 2119, RFC 8174) when, and only when, they appear in all capitals.

Build the change-detector that unblocks agent work on an untested codebase. This is not a correctness audit: current behaviour gets pinned even where it looks wrong, and a suspected bug gets reported rather than silently blessed as correct. The output is a net that catches unintended behaviour change, plus an honest account of what it could not net and why, not a coverage percentage.

When to use