How much responsibility should an U17 captain actually have?

For me, the important bit is to shift the captain's role from 'matchday mascot' to 'on-pitch standards bearer'. At U17, I expect the captain to manage the climate, not the tactics. If you want more ownership, start by giving them the responsibility for the warm-up intensity and the final huddle before kick-off. I’d also have them lead a post-match check-in on the pitch—not a tactical debrief, but a quick 'did we meet our energy goals today?' conversation. During the game, ask them to monitor the team’s reaction to a goal conceded. If heads drop, that is their domain. By delegating the 'emotional temperature' of the squad to them, you free yourself to manage the technical and tactical adjustments. The bit I would avoid is letting them dictate positions or tactical shape, as that undermines your role. Keep it about standards, energy, and communication; leave the coaching to the touchline.