// access coordination service functionalities.
TF_CAPI_EXPORT extern TF_CoordinationServiceAgent*
TF_GetCoordinationServiceAgent(TF_OpKernelContext* ctx);

// Returns true if the coordination service agent has been initialized.
TF_CAPI_EXPORT extern bool TF_CoordinationServiceIsInitialized(
    TF_CoordinationServiceAgent* agent);

TF_CAPI_EXPORT extern void TF_CoordinationServiceInsertKeyValue(

  void (*path_exists)(const TF_Filesystem* filesystem, const char* path,
                      TF_Status* status);

  /// Checks if all values in `paths` exist in the filesystem.
  ///
  /// Returns `true` if and only if calling `path_exists` on each entry in
  /// `paths` would set `status` to `TF_OK`.
  ///
  /// Caller guarantees that:
  ///   * `paths` has exactly `num_files` entries.