{"mcpName":"station__stem__stem-chem-ratio","slug":"stem__stem-chem-ratio","label":"stem-chem-ratio","description":"Create a Ratio value and optionally compute fold change vs a second ratio.","domainSlug":"stem","pvRelevance":"pv-adjacent","backend":"external","agentMetadata":{"idempotent":null,"read_only":null,"expected_latency_ms":null,"cost_tokens_estimate":null,"pipes_to":null},"inputSchema":{"properties":{"compare_to":{"type":"number"},"value":{"description":"Concentration ratio value (substance/volume, ≥ 0.0)","type":"number"}},"required":["value"],"type":"object"},"example":null,"taxonomy":{"rank":{"domain":"Substrata","kingdom":"Constructa","phylum":"Configa","class":"station-config","order":"stem","family":"mcp-tool-config"},"characteristics":{"substrate":"config","domain":"pv","lifecycle":"continuous","stateful":false,"persistence":"none","authority":"read","compounding":"producer","io_input":"agent-request","io_output":"tool-response"}},"_links":{"html":"/tools/stem__stem-chem-ratio","markdown":"/tools/stem__stem-chem-ratio/raw.md","invoke":"/api/mcp","catalog":"/api/mcp"}}