Assay is a CI-native evidence compiler designed for agent governance on the MCP platform. It focuses on deterministic policy enforcement, providing a reliable framework for managing tool calls in agent systems. The software generates reviewable evidence artifacts that clarify the trust levels of agent actions, categorized as verified, self-reported, inferred, or absent. This granularity in evidence allows users to maintain stringent oversight of their agents' interactions with MCP servers.

The application operates without the need for a hosted backend, ensuring that all decisions and evidence are generated locally. Assay's core features include the ability to intercept tool calls, apply policies, and produce tamper-evident evidence bundles. It also integrates seamlessly with CI/CD workflows, enabling teams to prevent policy violations before they reach production. The tool is particularly suited for developers working with various MCP clients who require a robust and auditable governance solution.