The telling of the gospel is not the gospel itself. Grace excludes works. Works do accompany the gospel, the works are not part of the gospel, but do accompany it.
The Judaizers taught another gospel which was not another, but added the Law to grace. Adding the works which accompany the gospel to be paet of the gospel is another gospel in the same way.
". . . the gospel which I preached unto you, . , ,
By which also ye are saved, , , ,
For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
And that he was buried, and that he rose again the third day according to the scriptures: . . ." -- Corinthians 15:3-4.
". . . of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; . . ." -- Romans 1:16,
". . . For by grace are ye saved through faith; and that not of yourselves:
it is the gift of God:
Not of works, . . ." -- Ephesians 2:8-9.
". . . But if our gospel be hid, it is hid to them that are lost:
In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them. . . ." -- 2 Corinthians 4:3-4.