Assay

Assay is an open-source tool designed for security, auditability, and evidence recording of privileged Model Context Protocol (MCP) tool actions. It captures tool call decisions, observations, and unproven claims, enabling offline, tamper-evident review and enforceable policy gating. Targeted at developers, DevOps/SecOps, and security researchers maintaining agent-based automations, it provides CI-native, backend-free verification and structured offline evidence bundles for tool call attestations in sensitive/privileged agent workflows.