Good tools already cover part of this. Here's where each one stops and Promptline starts.
Why not Espanso or AutoHotkey?
They're good at what they do: a typed trigger expands into text. They know nothing about your clipboard, packs or fill-in fields; Promptline is a library you search, with a preview, pins and your most used prompts first.
Why not Raycast snippets?
Raycast is a fine launcher, on Windows too, and its snippets take the clipboard. The difference is where the library lives: a Promptline pack is a plain JSON file you can commit, an agent can write one through Generate, and every import goes through a checklist first.
Why not slash commands in Claude Code, or Cursor rules?
They're the right tool inside the one tool they belong to; Windows Terminal's snippets are the same, with no clipboard to put inside. A prompt library hotkey works everywhere: the same library pastes into the terminal, the browser, the IDE and a PR comment box.
Why not a clipboard manager?
Ditto and the Windows clipboard history remember what you copied, and do it well. Promptline is what you meant to say about it: your clipboard, inside the prompt you picked.
Why not PowerToys Advanced Paste?
It runs a model over your clipboard, a model you configure, and pastes what the model said. Promptline runs no model and sends nothing anywhere: it pastes the prompt you picked, your clipboard inside, into the agent you were already talking to, the one with your repo open.
Why not a Notion page of prompts?
It keeps prompts tidy, and it's two windows and a copy away. Promptline is one hotkey away, in every window, with your clipboard already inside.