{"version":"2.1.267","anchor":"mcp-passthrough-tool-allowlist-raised-from-256-to-1024-entri","canonical_anchor":"mcp-passthrough-tool-allowlist-raised-from-256-to-1024-entri","heading":"MCP passthrough tool allowlist raised from 256 to 1024 entries; entries can carry annotations\/hints","tier":"notice","area":"MCP","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.267\/e\/mcp-passthrough-tool-allowlist-raised-from-256-to-1024-entri","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.267","markdown":"### MCP passthrough tool allowlist raised from 256 to 1024 entries; entries can carry annotations\/hints\n\nMCP passthrough tool lists can now hold up to 1024 tools instead of 256, and can carry annotations\/hints\n\n**What**\n\nClaude Code forwards its MCP (Model Context Protocol) tools to worker processes using an internal \"passthrough\" list. That list's limit was raised from 256 entries to 1024, so setups with a very large number of MCP tools no longer hit the old cap. Each entry in the list can also now carry optional `annotations` and `hints` fields.\n\n**Why**\n\nUsers connecting many MCP servers with lots of tools were previously capped at 256 forwarded tools; the higher limit removes that ceiling for larger tool setups.\n\n- Area: MCP\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 2\/5"}