what_is_missing — materials MCP Tool
what_is_missing
(what is missing) is one of 24 tools on the
materials
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call what_is_missing from your client
- Claude Code materials what_is_missing run in your project directory
- Claude Desktop materials what_is_missing ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor materials what_is_missing ~/.cursor/mcp.json
- VS Code materials what_is_missing .vscode/mcp.json
- Zed materials what_is_missing ~/.config/zed/settings.json
- Windsurf materials what_is_missing ~/.codeium/windsurf/mcp_config.json
- Cline materials what_is_missing ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI materials what_is_missing ~/.gemini/settings.json
- Grok materials what_is_missing .mcp.json (in your project root)
- ChatGPT materials what_is_missing Settings → Connectors → Advanced → Developer mode
- Claude.ai materials what_is_missing Settings → Connectors → Add custom connector
- LangChain materials what_is_missing pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http materials https://spacemushroom.com/mcpOther tools on this server
- search_materials
- get_material
- compare
- list_properties
- get_term
- find_materials
- list_claims
- prove_claim
- resolve_designation
- search_sources
- find_products
- search_products
- get_product
- product_parts
- products_using_material
- materials_used_by_function
- standards_for
- orgs_for
- products_by_maker
- engines_for_vehicle
- vehicles_for_engine
- product_graph
- compare_products
This list was read from the server itself, by connecting to it and calling tools/list on 11 November 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.