pycsw supports the OGC OpenSearch Geo and Time Extensions 1.0 standard via the following conformance classes:
OpenSearch support is enabled by default. HTTP requests must be specified with mode=opensearch in the base URL for OpenSearch requests, e.g.:
http://localhost/pycsw/csw.py?mode=opensearch&service=CSW&version=2.0.2&request=GetCapabilities
This will return the Description document which can then be autodiscovered.