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KERN checks code and contracts as claims that require machine evidence. It uses Z3, a proof-DAG checker written in Zig, and Lean 4 theorems, with Belnap four-valued logic to resolve conflicting knowledge. It is for developers and AI agents that need to verify code, contracts, and behavior changes. KERN supports polyglot contracts for Python, Zig, C, and Rust, and provides an MCP server with eight tools for AI agents.
Key features
- Re-checks Z3 proof DAGs inside Zig and checks SAT counterexamples.
- Reads @kern:requires and @kern:ensures contracts in Python, Zig, C, and Rust.
- Provides eight MCP tools over stdio for MCP clients.
- Can emit SARIF reports and GitHub annotations.
- Includes a WebAssembly-based browser code scanner that runs locally without server calls.
- Provides a CLI, Docker image, and static binary.
Use cases
- 01Verify AI-generated code against formal contracts.
- 02Check whether two code revisions behave differently.
- 03Scan code for branch conditions that can be simultaneously true.
- 04Run code verification in CI and produce SARIF reports for GitHub Code Scanning.
- 05Use verification tools from an MCP client.
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