{"version":"2.1.119","anchor":"mcp-completion-support-mcpcompletable","canonical_anchor":"mcp-completion-support-mcpcompletable","heading":"MCP Completion Support ( McpCompletable )","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.119\/e\/mcp-completion-support-mcpcompletable","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.119","markdown":"### MCP Completion Support (`McpCompletable`)\n\n**What**\n\nAdded support for MCP completion\/autocomplete of prompts and resource templates.\n\n**Details**\n\n- New `McpCompletable` type registered as `Symbol.for(\"mcp.completable\")`\n- Validates completion request types: prompts must use `ref\/prompt`, resource templates must use `ref\/resource`\n- Provides structured error messages: \"Expected CompleteRequestPrompt, but got ...\" \/ \"Expected CompleteRequestResourceTemplate, but got ...\"\n\n**Evidence**\n\nMCP completions (search for `\"McpCompletable\"`, `\"mcp.completable\"`, `\"Expected CompleteRequestPrompt\"`)"}