{"version":"2.1.323","anchor":"plugin-remote-mcp-reachable-hosts-hint-env-var-added","canonical_anchor":"plugin-remote-mcp-reachable-hosts-hint-env-var-added","heading":"New environment variable lists which hosts remote plugin MCP servers can reach","tier":"use","area":"Plugins","scope":"both","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323\/e\/plugin-remote-mcp-reachable-hosts-hint-env-var-added","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323","markdown":"### New environment variable lists which hosts remote plugin MCP servers can reach\n\nCLAUDE_CODE_PLUGIN_REMOTE_MCP_REACHABLE_HOSTS_HINT lets you give a comma-separated list of reachable hosts for remote plugin MCP servers\n\n**What**\n\nAn environment variable is a named value set before a program starts. Claude Code now reads `CLAUDE_CODE_PLUGIN_REMOTE_MCP_REACHABLE_HOSTS_HINT` as a comma-separated list of hosts. It is used when Claude Code finds remote MCP servers (outside tool servers) that come with plugins. Each entry can be:\n\n- a plain host name in ASCII letters\n\n- a wildcard name such as `*.example.com`\n\n- an IP address\n\nEntries must not include a scheme such as `https:\/\/` or a port. If any entry cannot be read, Claude Code logs a warning and ignores the whole list until every entry is valid. The plugin server lookup can also be told to ignore the list.\n\n**Why**\n\nThis lets whatever runs Claude Code tell it which hosts remote plugin MCP servers can actually reach. One bad entry turns the whole hint off, so check the list if it seems to have no effect.\n\n- Area: Plugins\n- Names: `CLAUDE_CODE_PLUGIN_REMOTE_MCP_REACHABLE_HOSTS_HINT`\n- Tier: Use it now\n- Useful: 5\/5\n- Signal: 3\/5\n- Scope: both\n- Heads-up: no"}