Belay

Belay is an AI tool described by its creators as “Your agent said the tests pass. Belay re-ran them”.

Frameworks build the agent. Observability records what it did. Belay is the harness: it proxies your agent's MCP tool calls, sandboxes them, and replays each against the restored pre-state a verdict grounded in re-execution, not a model's opinion. Self-hosted.

Source: View Belay on Product Hunt