{"version":"2.1.70","anchor":"mcp-instructions-now-delivered-as-deltas","canonical_anchor":"mcp-instructions-now-delivered-as-deltas","heading":"MCP Instructions Now Delivered as Deltas","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.70\/e\/mcp-instructions-now-delivered-as-deltas","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.70","markdown":"### MCP Instructions Now Delivered as Deltas\n\nMCP server instructions are now delivered incrementally as a new `mcp_instructions_delta` attachment type, sending only added\/removed server instructions instead of the full set each turn. Falls back to the previous full-set approach when the `tengu_basalt_3kr` feature flag is disabled.\n\n**Evidence**\n\nDelta attachment handler (search for `\"mcp_instructions_delta\"`)"}