set-hyperparameter

Dispatches the matching AdminUtils sudo_set_* call for the named parameter (alpha_low/alpha_high read the current pair from chain and set both via sudo_set_alpha_values). The signer must be the subnet's owner coldkey; root-only parameters are not available here and must go through the raw-call escape hatch. Changes take effect on chain immediately and shape subnet economics and consensus (registration costs, weight rules, immunity, transfers), so verify the raw value before sending — value accepts either the raw on-chain integer or a human form that is converted for you. Some parameters are rate-limited by the chain, so a quick follow-up change can fail. Read current values back with the subnet_hyperparameters read.

Parameters

Address parameters (--hotkey, --coldkey, --dest, ...) accept a raw ss58 address, an address-book or proxy-book name, or a local wallet/hotkey name.

CLI

Preview with --dry-run (shows fee, effects, and policy result without submitting), then submit:

btcli tx set-hyperparameter \
  --netuid <int> \
  --name <value> \
  --value <value> --dry-run
btcli tx set-hyperparameter \
  --netuid <int> \
  --name <value> \
  --value <value> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.SetHyperparameter(netuid=1, name="...", value="...")

sub = bt.Subtensor()
plan = sub.plan(intent, wallet)   # fee, effects, policy — no submission
result = sub.execute(intent, wallet)
if not result.success:
    print(result.error.code, result.error.remediation)

(bt.Subtensor is also the async client — async with bt.Subtensor() as client: — see The client.) Or build the intent by op name, as an agent would:

result = sub.execute_tool("set_hyperparameter", {...}, wallet)

On-chain implementation

Every file is browsable under /code exactly as built into the runtime, or as plain text under /code/raw/<path> (index: /code/index.json).