{"version":"2.1.273","anchor":"read-tool-gains-a-deviceinode-identity-check-against-writes","canonical_anchor":"read-tool-gains-a-deviceinode-identity-check-against-writes","heading":"Read tool gains a device\/inode identity check against writes (macOS)","tier":"internal","area":"File Tools","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.273\/e\/read-tool-gains-a-deviceinode-identity-check-against-writes","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.273","markdown":"### Read tool gains a device\/inode identity check against writes (macOS)\n\nOn macOS, the Read tool now checks a file's actual disk identity against files already held open by a write\n\n**What**\n\nWhen Claude reads a file, Claude Code now checks a per-session record of files already 'held' from an earlier write to that same path. On macOS specifically, it goes further and computes the file's real on-disk identity (its device and inode numbers, the operating system's way of uniquely identifying a file even if the path changes) for the resolved path and for a fallback path used when a file isn't found, and passes that identity along with the read.\n\n**Why**\n\nThis guards against subtle mixups where a path read from disk isn't actually the same file that was just written, for example if something was moved, replaced, or symlinked in between, keeping Claude's view of a file's contents consistent with what it just wrote on macOS.\n\n- Area: File Tools\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 1\/5"}