Claude Code 2.1.292 adds per-agent effort controls and marketplace install flow while hardening sandbox, file-read and permission boundaries

What changed

Anthropic released Claude Code 2.1.292 on October 6. The Agent tool gains an effort parameter, plugin installation can add a marketplace through --marketplace before installing, mods gain prompt caching and additional hook capabilities, and local MCP servers now negotiate protocol version 2026-07-28 by default. Security fixes cover UNC network-path reads, link swaps during approved file reads, tampered server-managed settings caches, managed-sandbox deny-path changes and several permission-hook edge cases during plugin worker restarts. The release also contains extensive cloud-session, routine, scheduled-task and Remote Control reliability fixes.