{"version":"2.1.288","anchor":"mcp-tool-listing-content-block-type-handled","canonical_anchor":"mcp-tool-listing-content-block-type-handled","heading":"Claude Code recognises a new kind of MCP tool listing in replies","tier":"internal","area":"MCP","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.288\/e\/mcp-tool-listing-content-block-type-handled","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.288","markdown":"### Claude Code recognises a new kind of MCP tool listing in replies\n\nClaude Code now handles an \"MCP tool listing\" content block alongside MCP tool calls and results\n\n**Unclear.** It is not clear whether the model sends this block type yet.\n\n**What**\n\nReplies from the model are made of blocks of different types. Claude Code now handles a block type called `mcp_tool_listing`, next to the existing blocks for MCP tool calls and results. MCP, the Model Context Protocol, is a standard way to connect Claude to outside tools.\n\n**Why**\n\nThis points to a new way for the model to report which MCP tools it has.\n\n- Area: MCP\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 3\/5\n- Scope: individual\n- Heads-up: no"}