{"version":"2.1.228","anchor":"mcp-sse-liveness-callback-renamed-to-heartbeat","canonical_anchor":"mcp-sse-liveness-callback-renamed-to-heartbeat","heading":"MCP SSE liveness callback renamed to heartbeat","tier":"internal","area":"MCP","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.228\/e\/mcp-sse-liveness-callback-renamed-to-heartbeat","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.228","markdown":"### MCP SSE liveness callback renamed to heartbeat\n\nAn MCP connection-liveness callback was renamed to heartbeat; nothing behaves differently.\n\n**What**\n\nThe SSE transport's liveness probe callback, its setter and its error log were renamed to heartbeat. The log now reads \"SSETransport: onHeartbeatProbe handler threw\". No behaviour change.\n\n**Evidence**\n\n`SSETransport: onHeartbeatProbe handler threw: `\n\n- Area: MCP\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 0\/5"}