{"version":"2.1.310","anchor":"artifact-prompt-cache-key-gains-a-third-variant-wa2","canonical_anchor":"artifact-prompt-cache-key-gains-a-third-variant-wa2","heading":"Artifact sessions that replace built-in tools get their own prompt cache group","tier":"internal","area":"Artifacts","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.310\/e\/artifact-prompt-cache-key-gains-a-third-variant-wa2","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.310","markdown":"### Artifact sessions that replace built-in tools get their own prompt cache group\n\nPrompt caching for artifact sessions now has a third group, for sessions where artifact tools replace the built-in ones\n\n**What**\n\nThe prompt cache lets Claude Code reuse earlier parts of a request instead of sending them again from scratch. Requests are grouped by a key. For artifact sessions there were two groups, and there are now three:\n\n- Sessions whose tools include a particular artifact tool\n\n- Sessions where artifact MCP tools replace the built-in ones, which used to share the first group\n\n- All other sessions\n\n**Why**\n\nRequests from these two kinds of artifact session no longer share cached prompts.\n\n- Area: Artifacts\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 2\/5\n- Scope: individual\n- Heads-up: no"}