As a secret agent you might want to keep more in bonds as it's less volatile and you may have some hospital bills after some missions.
Jokes aside, I keep more of my HSA in bonds and my Roth IRA/401k in stocks. HSA may be 60% bonds and Roth IRA 10% bonds, but it all balances out to a 80% stock/20% bond portfolio across all accounts. This way that money is there in case I need to use it for health related expenses god forbid a major health event and it's value will be less volatile.