Speaking to Huw Edwards on The Wales Report, Andrew RT Davies defended his party from criticism that it simply opposes Labour policies rather than putting forward its own programme for government.
"At every juncture we bring forward an alternative, we don't just criticise," he said.
"There is a clear agenda for what the Welsh Conservatives stand for, and it's action.
"It's action to improve the economy, it's action to improve public services in Wales and it's action to strengthen communities the length and breadth of Wales."
Asked about his priority if the Tories won power after the assembly election in May, Mr Davies said: "The first spending commitment is protecting the NHS budget for the lifetime of this parliament, or the assembly's term, the five years.
"I would suggest that the outcomes in Wales regrettably aren't as good as we want them to be.
"And we want to make sure those outcomes are improved.
"That's why we've called for an independent Keogh-style enquiry into the NHS here in Wales so we can make those improvements, not on political whims, but led by clinicians themselves telling us what we need to be doing to improve the health service here in Wales."
Prof Sir Bruce Keogh investigated 14 NHS trusts in England for a review into higher-than-expected hospital death rates, published in 2013.
Speaking about the Wales Bill on further devolution, the Welsh Conservative leader praised Welsh Secretary Stephen Crabb's handling of the legislation, put on hold on Monday after MPs called for a re-think.
It followed claims that the draft bill was confusing, and would leave Welsh ministers with fewer powers rather than more.
Mr Davies said: "The secretary of state deserves huge credit; for instead of ploughing on with this bill, actually saying 'I've listened to what people have said to me'.
"Actually, the Welsh Labour government could learn a lot from this legislative process."
First Minister Carwyn Jones had called Monday's announcement on the Wales Bill an "avoidable delay to clear up an avoidable mess".

The footage shows Mr Duterte and his supporters making light of the assault by prison inmates in 1989 when he was town mayor.
He said the female missionary was so beautiful that "the mayor should have been first".
Critics say this shows Mr Duterte is "unfit" for the office of president.
Mr Duterte's supporters however have dismissed the comments as a joke.
The candidate is known for his irreverent speeches and boasts of sexual conquests.
One recent poll had him leading over other contenders ahead of the 9 May election.
The rape comments in a YouTube video are the latest in a string of inflammatory statements - including the proposed mass executions of suspected criminals - made by Mr Duterte.
In the video he refers to the missionary who was murdered while ministering in a prison in the city of Davao in the southern Philippines and goes on to make his remark to laughter at a campaign rally.
President Benigno Aquino's spokesman Herminio Coloma said the comments reflected Mr Duterte's "lack of fitness for the presidency" and his "utter lack of respect for women".
A rival presidential candidate, Vice-President Jejomar Binay, called the comments revolting.
"You are a crazy maniac who doesn't respect women and doesn't deserve to be president," Mr Binay told Mr Duterte in a statement.
Human Rights Watch (HRW) Deputy Asia Director Phil Robertson said the comments "were a disgusting endorsement of sexual violence" for which Mr Duterte should be utterly condemned.
In 2015, HRW described Mr Duterte as the death squad mayor for his tactics in dealing with violent crime in Davao, with more than 1,000 people being killed.

A 26-year-old man sustained facial injuries during the incident on a number 9A bus travelling on Paisley Road, Tradeston, towards Penilee.
The disturbance happened at about 20:00 on 20 December.
Police described the man they are looking for as white, in his 50s, of heavy build. He has blotchy skin and a shaved head.
He was wearing a hooded black body-warmer with a blue zip-top underneath.
Officers have asked anyone who recognises the man or has any further information to contact them.
Labour has been "ploughing on as if they have a divine right to rule" in Wales, the Welsh Conservative leader has said.
[NEXT_CONCEPT]
A video of leading Philippines presidential candidate Rodrigo Duterte joking about a murdered Australian rape victim has provoked a storm of protest.
[NEXT_CONCEPT]
Police have released CCTV images of a man they want to speak to following a racist assault on a Glasgow bus.