{"version":"2.1.307","anchor":"new-filechangedduringreaderror","canonical_anchor":"new-filechangedduringreaderror","heading":"File reads report an error when the file changes while being read","tier":"notice","area":"File Reading","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.307\/e\/new-filechangedduringreaderror","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.307","markdown":"### File reads report an error when the file changes while being read\n\nClaude Code now raises an error when a file changes while it is being read, warning that the lines read may not be its current lines\n\n**What**\n\nClaude Code now has an error for a file that changed while it was being read. The message says the lines read from it may not be its current lines, and the error notes whether only part of the file was read.\n\n**Why**\n\nA read that overlaps with another program writing the same file now fails visibly instead of quietly handing back out-of-date lines.\n\n- Area: File Reading\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}