nova/doc/api_samples/os-agents/agent-post-req.json

{
    "agent": {
        "hypervisor": "xen",
        "os": "os",
        "architecture": "x86",
        "version": "8.0",
        "md5hash": "add6bb58e139be103324d04d82d8f545",
        "url": "http://example.com/path/to/resource"
    }
}