# 013. A long text becomes a paste marker ## Measured 2026-10-24, Claude Code 2.1.309 and agy 1.4.5, in a pane 120 columns wide. ## What was measured `send-keys -l` typed text into an empty box. In Claude Code, text of 801 characters or more shows as `[Pasted text #N]`, and as `[Pasted text #N +K lines]` when it holds K line breaks. Text of 800 characters or fewer stays text, also on 60 lines. N counts the pastes of the process from 1. The Enter submits the whole text. The prompt in the `UserPromptSubmit` hook holds that text inside `` and ``. agy 1.4.5 draws no marker: a text of 3000 characters stayed text. ## Mechanism A tool that waits to see its own text in the box never sees a long text. It accepts the marker as its text only when the box held no marker after the clear, and the box then holds the marker alone. ## Incident A message of 910 characters failed after the whole send timeout with "Nothing was sent". ## Screens `claude/paste`, `claude/paste-lines`, `claude/paste-and-text`. ## Not measured Other pane widths. Whether the limit of 800 characters depends on the width. ## Source Measured by the tg-bridge project. The text is a summary of its notes, and it holds no host details and no session details.