{"version":"2.1.304","anchor":"sandbox-dependency-check-fails-fast-in-some-sessions","canonical_anchor":"sandbox-dependency-check-fails-fast-in-some-sessions","heading":"Sandbox reports unavailable at once in some sessions","tier":"notice","area":"Sandbox","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.304\/e\/sandbox-dependency-check-fails-fast-in-some-sessions","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.304","markdown":"### Sandbox reports unavailable at once in some sessions\n\nIn some sessions the sandbox check now fails straight away with \"The sandbox is unavailable in this session\"\n\n**Unclear.** Which sessions are affected, and so who cannot use the sandbox, is not known.\n\n**What**\n\nThe sandbox is a closed-off area that limits what commands Claude runs can do. Before using it, Claude Code checks that the programs it needs are installed. In some sessions it now skips that check and reports \"The sandbox is unavailable in this session\" straight away. Before, it always ran the check.\n\n**Why**\n\nIn those sessions the sandbox is reported as unavailable rather than tried.\n\n- Area: Sandbox\n- Tier: You'll notice\n- Useful: 1\/5\n- Signal: 2\/5\n- Scope: individual\n- Heads-up: no"}