{"name":"CLAUDE_CODE_MCP_HANDED_LISTINGS","slug":"claude-code-mcp-handed-listings","family":"env","title":"Environment variables","noun":"environment variable","description":"MCP tool lists handed over by the host are now compared with the live server, and CLAUDE_CODE_MCP_HANDED_LISTINGS=0 turns them off","description_source":"entry","described_by":{"version":"2.1.311","anchor":"mcp-handed-listings-gain-an-env-opt-out-and-a-compared-befor"},"presence":{"first_seen":"2.1.311","removed_in":"2.1.312","in_current_build":false,"newest_mined":"2.1.312","builds":1,"mined_builds":153,"first_cited":{"version":"2.1.311","released_at":"2026-10-26 19:47:57","spans":1}},"aliases":[],"entries":[{"version":"2.1.311","anchor":"mcp-handed-listings-gain-an-env-opt-out-and-a-compared-befor","heading":"MCP tool lists from the host are checked, with an opt-out","line":"MCP tool lists handed over by the host are now compared with the live server, and CLAUDE_CODE_MCP_HANDED_LISTINGS=0 turns them off","released_at":"2026-10-26 19:47:57","reason":"found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"CLAUDE_CODE_MCP_ALLOWLIST_ENV","slug":"claude-code-mcp-allowlist-env","description":"Set to `1` to spawn stdio MCP servers with only a safe baseline environment plus the server's configured `env`, instead of inheriting your shell environment"},{"name":"CLAUDE_CODE_MCP_ALWAYS_LOAD_JOIN_BEFORE_INPUT","slug":"claude-code-mcp-always-load-join-before-input","description":"A new environment variable, `CLAUDE_CODE_MCP_ALWAYS_LOAD_JOIN_BEFORE_INPUT`, affects always-load MCP servers when set to exactly `true`"},{"name":"CLAUDE_CODE_MCP_APPS_HOST","slug":"claude-code-mcp-apps-host","description":"With CLAUDE_CODE_MCP_APPS_HOST set to true, Claude Code tells MCP servers it accepts MCP App content"},{"name":"CLAUDE_CODE_MCP_AUTO_BACKGROUND_MS","slug":"claude-code-mcp-auto-background-ms","description":"Elapsed time in milliseconds before a still-running MCP tool call [moves to a background task](\/docs\/en\/mcp#automatic-backgrounding-of-long-tool-calls) (default: 120000, or 2 minutes). Set to `0` to turn automatic backgrounding off. Requires Claude Code v2.1.212 or later"},{"name":"CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_MS","slug":"claude-code-mcp-connector-prewait-ms","description":"New CLAUDE_CODE_MCP_CONNECTOR_PREWAIT_MS environment variable overrides how long Claude Code waits for remote MCP servers to start"},{"name":"CLAUDE_CODE_MCP_MEMORY_CGROUP","slug":"claude-code-mcp-memory-cgroup","description":"On Linux you can force MCP servers into their own memory cgroup with an environment variable."},{"name":"CLAUDE_CODE_MCP_PREWAIT_SERVERS","slug":"claude-code-mcp-prewait-servers","description":"`CLAUDE_CODE_MCP_PREWAIT_SERVERS` and `CLAUDE_CODE_MCP_PREWAIT_SERVERS_MS` name MCP servers for remote worker sessions to wait for before the first turn"},{"name":"CLAUDE_CODE_MCP_PREWAIT_SERVERS_MS","slug":"claude-code-mcp-prewait-servers-ms","description":"`CLAUDE_CODE_MCP_PREWAIT_SERVERS` and `CLAUDE_CODE_MCP_PREWAIT_SERVERS_MS` name MCP servers for remote worker sessions to wait for before the first turn"},{"name":"CLAUDE_CODE_MCP_REGISTRY_FETCH_AT_STARTUP","slug":"claude-code-mcp-registry-fetch-at-startup","description":"Claude Code now waits to download the official MCP registry list until it's needed, unless `CLAUDE_CODE_MCP_REGISTRY_FETCH_AT_STARTUP` is set"},{"name":"CLAUDE_CODE_MCP_STARTUP_WAIT_MS","slug":"claude-code-mcp-startup-wait-ms","description":"How long in milliseconds the first turn of a [non-interactive](\/docs\/en\/headless) session waits for MCP servers that are still connecting, in place of the default [first-turn wait](\/docs\/en\/agent-sdk\/mcp#connection-timing). When set, the wait covers every pending server. Set to `0` to skip the wait. A [`--permission-prompt-tool`](\/docs\/en\/cli-reference#cli-flags) server keeps its own `MCP_TIMEOUT` wait regardless of the value. Requires Claude Code v2.1.274 or later"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/claude-code-mcp-handed-listings","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}