I'm using Jenkins on Win7 and i've installed tomcat for
[ssh-agent] Using credentials IliptonChen(APRTest)
[ssh-agent] Looking for ssh-agent implementation...
[ssh-agent] FATAL: Could not find a suitable ssh-agent provider
FATAL:[ssh-agent] Unable to start agent
Check the version of your ssh-agent used by Jenkins.
This bug (for linux, but could apply to Windows too) reports (10 days ago, January 2014) this very same error message:
JENKINS-20276: Native Library Error after upgrading ssh-agent from 1.3 to 1.4".
Downgrading to 1.3 resolves the issue.