{"version":"2.1.274","anchor":"new-stdio-mcp-protocol-negotiation-gate-added","canonical_anchor":"new-stdio-mcp-protocol-negotiation-gate-added","heading":"New stdio MCP protocol-negotiation gate added","tier":"soon","area":"MCP","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.274\/e\/new-stdio-mcp-protocol-negotiation-gate-added","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.274","markdown":"### New stdio MCP protocol-negotiation gate added\n\nA new gate lets stdio MCP connections also try the newer protocol-negotiation handshake\n\n**What**\n\nMCP servers connected via stdio (standard input\/output, a local process-based connection type) can now use the same automatic protocol-version negotiation that other connection types have, including their own probe timeout setting, instead of always using the older legacy handshake.\n\n**Why**\n\nThis extends newer protocol-negotiation support to stdio-based MCP servers, though it is controlled by a gate that determines whether it's actually turned on for a given account.\n\n- Flag `tengu_mcp_protocol_negotiation_stdio`: Off in both readings (read for one account on one subscription tier against v2.1.274; this account: off, anonymous baseline: off, compiled default: off) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Area: MCP\n- Names: `tengu_mcp_protocol_negotiation_stdio`\n- Tier: Nothing to try yet\n- Useful: 2\/5\n- Signal: 3\/5\n- Present in the build but not switched on"}