{"version":"2.1.319","anchor":"cache-key-marker-for-the-agent-whentouse-field-gains-a-third","canonical_anchor":"cache-key-marker-for-the-agent-whentouse-field-gains-a-third","heading":"An agent with no usage description is now recorded differently internally","tier":"internal","area":"Agents","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.319\/e\/cache-key-marker-for-the-agent-whentouse-field-gains-a-third","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.319","markdown":"### An agent with no usage description is now recorded differently internally\n\nAn internal marker for whether an agent has a when-to-use description now tells missing apart from empty and filled in\n\n**What**\n\nAgents can carry a description of when to use them. Claude Code builds an internal marker from it. Before, the marker told apart an empty description and a filled-in one, and a missing description produced no marker. Now a missing description gets a marker of its own, giving three cases.\n\n**Why**\n\nThis affects internal bookkeeping, such as cache keys, more than anything you see.\n\n- Area: Agents\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 0\/5\n- Scope: individual\n- Heads-up: no"}