{"version":"2.1.307","anchor":"sdk-mcp-tool-relist-join-falls-back-on-tool-relist","canonical_anchor":"sdk-mcp-tool-relist-join-falls-back-on-tool-relist","heading":"Tool lists from SDK-provided MCP servers gain a fallback refresh","tier":"notice","area":"Agents","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.307\/e\/sdk-mcp-tool-relist-join-falls-back-on-tool-relist","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.307","markdown":"### Tool lists from SDK-provided MCP servers gain a fallback refresh\n\nFor MCP servers supplied by the SDK, Claude Code now falls back on a tool-list refresh when its usual lookup returns nothing\n\n**Unclear.** What this changes for a user of SDK-provided MCP servers is not clear.\n\n**What**\n\nMCP servers give Claude extra tools, and a program using the SDK (the toolkit for driving Claude Code) can supply them. When Claude Code's usual lookup for those servers returns nothing, it now falls back on a step that refreshes their tool list.\n\n**Why**\n\nIn practice, tool lists from SDK-provided MCP servers can be refreshed.\n\n- Area: Agents\n- Tier: You'll notice\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}