Regression Detection & Spec Verification FAQs

Question 1

Does this skill support languages like Python and Go?

Accepted Answer

Yes, the registry is designed to cover extracted code in languages such as Python and Go, verifying their properties through the Dafny formal verification engine.

Question 2

Can I filter which regressions are checked?

Accepted Answer

Yes, you can provide an optional spec-ID to check a specific function or use the --hard-only flag to focus exclusively on formal Dafny proofs rather than soft constraints.

Question 3

What happens if a re-verification fails?

Accepted Answer

Claude generates a detailed diagnostic report identifying the specific failed postcondition, the code changes that likely caused it, and actionable suggestions to either fix the code or update the spec.

Question 4

How does the skill detect if a file has changed?

Accepted Answer

It uses a combination of 'git diff' to identify modified files since the last verification timestamp and SHA-256 hash comparisons to detect changes in the Dafny source specifications.

Question 5

What is the spec registry used by this skill?

Accepted Answer

The spec registry is a `.crosscheck/specs.json` file that tracks which functions have verified Dafny specifications, their source locations, and when they were last successfully verified.

Regression Detection & Spec Verification

Key Features

Use Cases

Regression Detection & Spec Verification

Key Features

Use Cases