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`send_attachment` handed its `file_path` argument straight to `InputFile::file`, which resolves against the **server process's** working directory. Every path the model can actually have — relative to the user's home, or absolute inside their container — failed the `path.exists()` check, and the one class that didn't (a name that happens to exist next to the binary) would have sent the wrong file. The routing already exists for the fs-tools, so expose it rather than repeat it: `UserFilesApi` (core-api) reads a path in the agent's own vocabulary and is obtained from `UserChannelHandle::files()`, so it is scoped to one user by construction. skald-core implements it over `resolve_view_target` — host mount read directly, container-only path through `docker exec` — holding the `SharedFs` cell rather than a snapshot, so a remount lands without a login. The size cap is checked before the read (a new `exec_fs::size` for the container branch): the point of a cap is to keep an oversized file out of RAM, so checking it afterwards would protect nothing. A photo above `sendPhoto`'s narrower 10 MB ceiling goes out as a document instead of as an API error.