import {  DEFAULT_MODEL_BY_PROVIDER,  MODEL_SLUG_ALIASES_BY_PROVIDER,  type ClaudeCodeEffort,  type ModelCapabilities,  type ModelSlug,  type ProviderKind,} from "@t3tools/contracts"; export interface SelectableModelOption {  slug: string;  name: string;} export function getDefaultModel(provider: ProviderKind = "codex"): ModelSlug {  return DEFAULT_MODEL_BY_PROVIDER[provider];} // ── Effort helpers ──────────────────────────────────────────────────── /** Check whether a capabilities object includes a given effort value. */export function hasEffortLevel(caps: ModelCapabilities, value: string): boolean {  return caps.reasoningEffortLevels.some((l) => l.value === value);} /** Return the default effort value for a capabilities object, or null if none. */export function getDefaultEffort(caps: ModelCapabilities): string | null {  return caps.reasoningEffortLevels.find((l) => l.isDefault)?.value ?? null;} export function isClaudeUltrathinkPrompt(text: string | null | undefined): boolean {  return typeof text === "string" && /\bultrathink\b/i.test(text);} export function normalizeModelSlug(  model: string | null | undefined,  provider: ProviderKind = "codex",): ModelSlug | null {  if (typeof model !== "string") {    return null;  }   const trimmed = model.trim();  if (!trimmed) {    return null;  }   const aliases = MODEL_SLUG_ALIASES_BY_PROVIDER[provider] as Record<string, ModelSlug>;  const aliased = Object.prototype.hasOwnProperty.call(aliases, trimmed)    ? aliases[trimmed]    : undefined;  return typeof aliased === "string" ? aliased : (trimmed as ModelSlug);} export function resolveSelectableModel(  provider: ProviderKind,  value: string | null | undefined,  options: ReadonlyArray<SelectableModelOption>,): ModelSlug | null {  if (typeof value !== "string") {    return null;  }   const trimmed = value.trim();  if (!trimmed) {    return null;  }   const direct = options.find((option) => option.slug === trimmed);  if (direct) {    return direct.slug;  }   const byName = options.find((option) => option.name.toLowerCase() === trimmed.toLowerCase());  if (byName) {    return byName.slug;  }   const normalized = normalizeModelSlug(trimmed, provider);  if (!normalized) {    return null;  }   const resolved = options.find((option) => option.slug === normalized);  return resolved ? resolved.slug : null;} export function resolveModelSlug(  model: string | null | undefined,  provider: ProviderKind = "codex",): ModelSlug {  const normalized = normalizeModelSlug(model, provider);  if (!normalized) {    return DEFAULT_MODEL_BY_PROVIDER[provider];  }  return normalized;} export function resolveModelSlugForProvider(  provider: ProviderKind,  model: string | null | undefined,): ModelSlug {  return resolveModelSlug(model, provider);} /** Trim a string, returning null for empty/missing values. */export function trimOrNull<T extends string>(value: T | null | undefined): T | null {  if (typeof value !== "string") return null;  const trimmed = value.trim() as T;  return trimmed || null;} export function applyClaudePromptEffortPrefix(  text: string,  effort: ClaudeCodeEffort | null | undefined,): string {  const trimmed = text.trim();  if (!trimmed) {    return trimmed;  }  if (effort !== "ultrathink") {    return trimmed;  }  if (trimmed.startsWith("Ultrathink:")) {    return trimmed;  }  return `Ultrathink:\n${trimmed}`;}