{"name":"tengu_mcp_legacy_sse_fallback","slug":"tengu-mcp-legacy-sse-fallback","family":"flag","title":"Feature flags","noun":"feature flag","description":"MCP servers using newer HTTP now automatically retry with an older HTTP+SSE connection method if the newer one fails","description_source":"entry","described_by":{"version":"2.1.265","anchor":"mcp-connections-gain-legacy-httpsse-fallback-on-initialize"},"presence":{"first_seen":"2.1.265","removed_in":null,"in_current_build":true,"newest_mined":"2.1.280","builds":15,"mined_builds":123,"first_cited":{"version":"2.1.265","released_at":"2026-09-08 19:05:16","spans":2}},"aliases":[],"entries":[{"version":"2.1.274","anchor":"mcp-connect-timeout-retry-and-legacy-sse-fallback-gates-refe","heading":"MCP connect-timeout retry and legacy SSE fallback gates referenced","line":"MCP connection code references two settings controlling connect-timeout retries and legacy SSE fallback","released_at":"2026-09-16 22:36:09","reason":"named in this entry, gate cited by this entry, found in this entry's text"},{"version":"2.1.265","anchor":"mcp-connections-gain-legacy-httpsse-fallback-on-initialize","heading":"MCP connections gain legacy HTTP+SSE fallback on initialize failure","line":"MCP servers using newer HTTP now automatically retry with an older HTTP+SSE connection method if the newer one fails","released_at":"2026-09-08 19:05:16","reason":"gate cited by this entry"},{"version":"2.1.265","anchor":"legacy-httpsse-fallback-for-mcp-servers-rewritten-with-a-de","heading":"Legacy HTTP+SSE fallback for MCP servers rewritten with a dedicated gate","line":"MCP servers can fall back to a legacy HTTP+SSE connection method if the normal connection fails","released_at":"2026-09-08 19:05:16","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":3,"docs":[],"docs_total":0,"gates":[{"version":"2.1.274","state":"unknown","account":null,"baseline":null,"code_default":true},{"version":"2.1.265","state":"unknown","account":null,"baseline":null,"code_default":true}],"related":[{"name":"tengu_mcp_auto_background","slug":"tengu-mcp-auto-background","description":null},{"name":"tengu_mcp_cgroup","slug":"tengu-mcp-cgroup","description":"On Linux you can force MCP servers into their own memory cgroup with an environment variable."},{"name":"tengu_mcp_claudeai_eligibility_gate","slug":"tengu-mcp-claudeai-eligibility-gate","description":null},{"name":"tengu_mcp_claudeai_proxy_401","slug":"tengu-mcp-claudeai-proxy-401","description":"MCP proxy 401 telemetry now sanitizes the error code before logging it"},{"name":"tengu_mcp_cli_command_executed","slug":"tengu-mcp-cli-command-executed","description":null},{"name":"tengu_mcp_connect_timeout_retry","slug":"tengu-mcp-connect-timeout-retry","description":"MCP connect timeouts now respect the global timeout and get retried instead of failing."},{"name":"tengu_mcp_degraded","slug":"tengu-mcp-degraded","description":"MCP events are forwarded for logging with identifying fields stripped, and skipped entirely if analytics are off."},{"name":"tengu_mcp_delete","slug":"tengu-mcp-delete","description":"MCP CLI commands now hash server names in telemetry instead of sending them raw."},{"name":"tengu_mcp_directory_bff","slug":"tengu-mcp-directory-bff","description":null},{"name":"tengu_mcp_directory_visibility","slug":"tengu-mcp-directory-visibility","description":null}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-mcp-legacy-sse-fallback","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}