Deterministic MCP Catalog Lookup
Call one known MCP search tool directly from a workflow without an LLM choosing the tool.
The full canvas, before you import it
Click any node to see its config.
Click a node to select it — same as the Heym editor; the panel shows its settings.
3 nodes · Free & source-available
Deterministic MCP Catalog Lookup
Use the MCP Call node for a predictable, single-tool lookup. A query flows directly to one selected MCP tool, making this pattern ideal when your workflow already knows exactly what it needs to call.
What this workflow does
- CatalogQuery accepts a search phrase
- SearchCatalog invokes the configured MCP tool directly
- LookupResult returns the tool result
Use cases
- Product or service catalog searches
- Internal knowledge-base lookups with a fixed tool
- Deterministic data retrieval without an agent loop
Setup
Enter your MCP server connection on SearchCatalog, click Fetch Tools, then choose the real tool that performs the lookup. Map its required argument names in toolArguments; the sample uses query and limit.
Notes
MCP Call does not let an LLM select a tool. Use an Agent node instead when a model must reason across multiple tools or run a multi-step task.
How to import this template
- 1Click Import → Copy JSON on this page.
- 2Open your Heym and navigate to a workflow canvas.
- 3PressCmd+V/Ctrl+V— nodes appear instantly.
- 4Add your API keys in the node config panels and click Run.
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