A Welsh Conservatives spokesperson has said that Welsh Labour's deal with the "nationalists" will only will only cause "constitutional chaos that risks holding back our economic recovery."
The spokesperson also told BBC Wales that the "deal is remarkable for its absence of solutions to fix the NHS - currently experiencing its worst performance on record - or improve the economy in Wales".
Over the weekend, Welsh Labour and Plaid Cymru's executive committees approved a co-operation agreement between the two parties at the Senedd, which is set to last for "the coming three years".
The parties had entered discussions in September—after Welsh Labour won a total of 30 seats at the Senedd elections in May—leaving them just shy of a majority.
According to Darren Williams, a member of Labour's executive committee, policies in the agreement include:
Moves to establish rent controls
The extension of free school meals to all primary school pupils
Childcare for all two-year-olds
The creation of a National Care Service
Limits on second home ownership
A replacement for council tax
The creation of a publicly-owned construction company and an energy company
Changes to the Senedd’s size and electoral system, including a statutory guarantee of gender balance
Measures to promote the Welsh language
BBC Wales has reported that the deal also includes a commitment to "explore the creation of a shadow Broadcasting and Communications Authority for Wales, to address our concerns about the current fragility in the media and attacks on its independence".
It has been told that "This body would support the use of the Welsh language, particularly in digital and encourage media plurality.