Reveal-in-file-manager was always offered whenever the server exposed revealPath, including in a plain browser tab where there is no local file manager to reveal into. Gate it behind a new isBrowserClientRuntime check (web platform, no Electron shell) and relabel the save action to "Download" for that case, since it triggers a browser-style file download rather than an in-place save. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>