Std tool for classificatior mapping

[aarne]

Something like

bridge xxx {
  with lookup as l
  with output as o
  with input as i
  
  l.values {
    .a = "c"
    .b = "d"
  }
  
  o.text <- l.resolve:i.lookup_key
}

[aarne]

As this is very easy to do in userland we are still debating if this needs to be part of stdlib. if you need a reference implementation then this would work

import type { ToolMetadata } from "@stackables/bridge-types";

export const lookupTool = (input: { 
  dict?: Record<string, unknown>; 
  value?: string | number; 
}) => {
  if (!input.dict || input.value == null) {
    return undefined;
  }
  
  // Coerce the key to a string to ensure safe object property access
  const key = String(input.value);
  return input.dict[key];
};

// CRITICAL: Mark this as a sync tool so the engine bypasses Promise allocation!
lookupTool.bridge = {
  sync: true,
  doTrace: true, 
} as ToolMetadata;