In which session of the Congress did the extremist agenda appear for the first time on INC platform?

The extremist agenda and the political rift regarding Swadeshi methods (Boycott and National Education) began surfacing actively during the $1905$ phase following the partition of Bengal. Though the official historic split took place at the Surat session in $1907$, the ideological agenda of the Assertive/Extremist nationalists first formally challenged the Moderate platform during the sessions of $1905$.