claude-code-system-prompts/system-prompts/tool-description-senduserfile.md

Send files to the user. Use this when the file is the deliverable — a generated diagram, a report, a screenshot, a built artifact — and you want it surfaced, not just mentioned. Paths can be absolute or relative to the current working directory.

Add a caption when a one-liner of context helps ("the failing case is row 42", "before vs after"). Skip it if the file speaks for itself.

Set status on every call. Use proactive when you're initiating — the user is away and you want this to reach their phone (build artifact ready, report generated). Use normal when replying to something the user just said.