{"version":"2.1.321","anchor":"mcp-connector-block-for-plugin-servers-with-telemetry","canonical_anchor":"mcp-connector-block-for-plugin-servers-with-telemetry","heading":"Organization connector blocks can apply to plugin MCP servers","tier":"notice","area":"MCP","scope":"both","heads_up":true,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.321\/e\/mcp-connector-block-for-plugin-servers-with-telemetry","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.321","markdown":"### Organization connector blocks can apply to plugin MCP servers\n\nPlugin MCP servers matching a connector your organization blocked on claude.ai can now be blocked or just counted\n\n**Unclear.** It is not settled which mode applies when nothing sets `require_connector_block_on_plugin_servers`, so whether blocking is enforced by default is unclear.\n\n**What**\n\nMCP servers give Claude extra tools. Plugins can bring their own, and an organization can block claude.ai connectors.\n\n- A plugin MCP server whose address matches a connector the organization blocked can now be blocked. The flag `require_connector_block_on_plugin_servers` selects the mode.\n\n- Modes include \"on\", which blocks, and \"count_only\", which only counts matches. Others are \"fault\", \"unattributed\" and \"off\".\n\n- In \"on\" mode, sign-in fails with \"MCP OAuth refused: connector block\" or \"MCP OAuth refused: connector check failed\".\n\n- Sign-in waits for the connector list and fails with a timeout message if it is slow.\n\n- In \"count_only\" mode, if recounting fails the message is \"The connector block's count after a policy answer failed\".\n\n- The connector list can still be turned off with `ENABLE_CLAUDEAI_MCP_SERVERS` or the `disableClaudeAiConnectors` setting, now through one check with unchanged behaviour.\n\n**Why**\n\nOrganization admins can stop plugins from reconnecting a blocked service. If a plugin server stops connecting, an organization block may be the reason.\n\n- Area: MCP\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 3\/5\n- Scope: both\n- Heads-up: yes"}