{"version":"2.1.247","anchor":"prompts-now-carry-a-sandbox-description-alongside-date-and-a","canonical_anchor":"prompts-now-carry-a-sandbox-description-alongside-date-and-a","heading":"Prompts now carry a sandbox description alongside date and agent-list updates","tier":"internal","area":"Sandbox","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.247\/e\/prompts-now-carry-a-sandbox-description-alongside-date-and-a","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.247","markdown":"### Prompts now carry a sandbox description alongside date and agent-list updates\n\nEach turn now tells Claude which sandbox it is running in, re-sent only when it changes.\n\n**What**\n\nA new piece of per-turn context, computed from the active tool set, tells the model what sandbox it is running in. It is added on both the queued-prompt path and the per-turn attachment list, and is compared against the previous one so it is only re-sent when it changes.\n\n**Details**\n\n- It sits alongside the existing date-change and agent-listing-delta context items, and is handled the same way as the agent listing when diffing.\n- Nothing in the code shown gates the attachment itself.\n\n**Evidence**\n\n`fi(\"sandbox_instructions\", () => Promise.resolve(QQ(t.options.tools, o)))`\n\n- Area: Sandbox\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 3\/5"}