Function getLegacyModeForAgentMetadata

src/node/services/agentResolution.ts:96–101

(
  effectiveAgentId: string,
  effectiveMode: "plan" | "exec" | "compact"
)

// Derived agents (for example Explore, which uses Exec as its tool-policy base) should not
// be labeled as their base mode in persisted/public metadata; `agentId` is the source of truth.
export function getLegacyModeForAgentMetadata(
  effectiveAgentId: string,
  effectiveMode: "plan" | "exec" | "compact"
): "plan" | "exec" | "compact" | undefined {
  return effectiveAgentId === effectiveMode ? effectiveMode : undefined;
}

function coerceNonEmptyString(value: unknown): string | undefined {
  if (typeof value !== "string") {