{"name":"tengu_mcp_list_changed","slug":"tengu-mcp-list-changed","family":"flag","title":"Feature flags","noun":"feature flag","description":"Claude can now tell whether an MCP tool list refresh came from a reconnect or a server notification.","description_source":"entry","described_by":{"version":"2.1.221","anchor":"list-changed-refreshes-can-be-synthesized-after-a-listen-str"},"presence":{"first_seen":null,"removed_in":null,"in_current_build":false,"newest_mined":"2.1.309","builds":0,"mined_builds":150,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.224","anchor":"mcp-events-forwarded-to-datadog-with-identifying-fields-remo","heading":"MCP events forwarded to Datadog, with identifying fields removed and a per-server cap","line":"MCP events are forwarded for logging with identifying fields stripped, and skipped entirely if analytics are off.","released_at":"2026-08-07 01:36:32","reason":"gate cited by this entry, found in this entry's text"},{"version":"2.1.221","anchor":"list-changed-refreshes-can-be-synthesized-after-a-listen-str","heading":"list_changed refreshes can be synthesized after a listen stream reopens","line":"Claude can now tell whether an MCP tool list refresh came from a reconnect or a server notification.","released_at":"2026-08-03 22:16:25","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":2,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_mcp_list_paginated","slug":"tengu-mcp-list-paginated","description":"Unexpected telemetry values are replaced with a placeholder instead of being sent raw."},{"name":"tengu_mcp_listen_reopen","slug":"tengu-mcp-listen-reopen","description":"MCP notification streams now reconnect after a server drop or redeploy instead of silently going dead."},{"name":"tengu_mcp_listen_reopen_park","slug":"tengu-mcp-listen-reopen-park","description":"A flaky MCP server that keeps dropping event streams now gets a pause instead of endless instant reconnects."},{"name":"tengu_mcp_listen_reopen_park_tuning","slug":"tengu-mcp-listen-reopen-park-tuning","description":"A flaky MCP server that keeps dropping event streams now gets a pause instead of endless instant reconnects."},{"name":"tengu_mcp_listen_server_denylist","slug":"tengu-mcp-listen-server-denylist","description":"Remote config can force legacy MCP handshakes or suppress listening for named servers, matched by hostname."},{"name":"tengu_mcp_listing_prior_rejected","slug":"tengu-mcp-listing-prior-rejected","description":"Two telemetry events were allowlisted, one for rejected MCP tool listings and one comparing served model catalogs."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-mcp-list-changed","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}