Function prepareOperations

packages/plugins/graphql/src/sdk/plugin.ts:501–565

(
  fields: readonly ExtractedField[],
  introspection: IntrospectionResult,
)

};

const prepareOperations = (
  fields: readonly ExtractedField[],
  introspection: IntrospectionResult,
): readonly PreparedOperation[] => {
  const typeMap = new Map<string, IntrospectionType>();
  for (const t of introspection.__schema.types) {
    typeMap.set(t.name, t);
  }

  const fieldMap = new Map<string, { kind: GraphqlOperationKind; field: IntrospectionField }>();
  const schema = introspection.__schema;
  for (const rootKind of ["query", "mutation"] as const) {
    const typeName = rootKind === "query" ? schema.queryType?.name : schema.mutationType?.name;
    if (!typeName) continue;
    const rootType = typeMap.get(typeName);
    if (!rootType?.fields) continue;
    for (const f of rootType.fields) {
      if (!f.name.startsWith("__")) {
        fieldMap.set(`${rootKind}.${f.name}`, { kind: rootKind, field: f });
      }
    }
  }

  return fields.map((extracted) => {
    const prefix = extracted.kind === "mutation" ? "mutation" : "query";
    // A tool's name keeps its `<kind>.<field>` path (e.g. `query.hello`,
    // `mutation.setGreeting`). The address grammar treats `<tool>` as the
    // trailing remainder (see parseToolAddress), so the dot nests naturally.
    const toolName = `${prefix}.${extracted.fieldName}`;
    const description = Option.getOrElse(
      extracted.description,
      () => `GraphQL ${extracted.kind}: ${extracted.fieldName} -> ${extracted.returnTypeName}`,
    );

    const key = `${extracted.kind}.${extracted.fieldName}`;
    const entry = fieldMap.get(key);
    const built = entry
      ? buildOperationStringForField(entry.kind, entry.field, typeMap)
      : {
          operationString: `${extracted.kind} ${operationNameForField(extracted.fieldName)} { ${extracted.fieldName} }`,
          operationPrefix: undefined,
          operationSuffix: undefined,
        };

    const binding = OperationBinding.make({
      kind: extracted.kind,
      fieldName: extracted.fieldName,
      operationString: built.operationString,
      variableNames: extracted.arguments.map((a) => a.name),
      ...(built.operationPrefix !== undefined && built.operationSuffix !== undefined
        ? { operationPrefix: built.operationPrefix, operationSuffix: built.operationSuffix }
        : {}),
    });

    return {
      toolName,
      description,
      inputSchema: withSelectInput(