# pschanely/CrossHair

An analysis tool for Python that blurs the line between testing and type systems.

Repository: https://github.com/pschanely/CrossHair
Canonical: https://ross.abutalabs.com/products/crosshair
Language: Python
License: NOASSERTION
License Family: other
Topics: python, static-analysis, testing-framework, symbolic-execution, type-systems, fuzzing, contracts, dynamic-analysis, testing, z3, concolic-execution, hacktoberfest
Last push: 2026-08-19T15:15:09+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 98, longevity 100
- inputs: {"age_days": 3291, "days_push": 14, "days_rel": 17, "gap_med": 10, "n_releases_24m": 40}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1317, forks 98 (observed 2026-08-28T04:04:20.988209+00:00)

## What it is
CrossHair is a Python analysis tool that verifies functions against type annotations and contracts using symbolic execution backed by an SMT solver. It finds counterexamples, generates unit tests, and diffs behavior between functions.

## Use cases
- verify python functions against type annotations and contracts
- find counterexamples to function postconditions
- generate unit tests automatically from contracts
- find behavioral differences between two functions
- use symbolic execution as a hypothesis testing backend
- check preconditions and postconditions in python code

## When to choose
- you have type-annotated python code with contracts you want verified
- you want deeper path exploration than random property-based testing
- you want to generate unit tests or diff function behavior

## When to avoid
- you need fast, lightweight linting without deep analysis
- your code is not type-annotated or contract-specified
- you need support for languages other than python

## Facets
- artifact type: library
- maturity: active
- function: testing, fuzzing, type-system, linter
- domain: testing, developer-tools, programming-languages
- platform: python, cli, cross-platform
- tags: symbolic-execution, concolic-execution, contracts, smt-solver, z3, property-based-testing, static-analysis, counterexample-generation, unit-test-generation, algorithms

## Member repositories
- pschanely/CrossHair (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:20.988209+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:48:13.977318+00:00, confidence not recorded.
  - readme: https://github.com/pschanely/CrossHair (fetched 2026-08-28T04:04:20.988209+00:00, sha 90dd9d11d370)
- Data as of 2026-08-30T08:39:29.467469+00:00.