# set-mechanism-emission-split (/docs/tx/set-mechanism-emission-split)

Owner-only: divides the subnet's emission between its mechanisms. The
list gives one u16 weight per mechanism, in order, and the entries must
sum to exactly 65,535; each mechanism receives that fraction of
emission. The list may be at most as long as the subnet's current
mechanism count (see `set_mechanism_count`) — a shorter list leaves
the trailing mechanisms with zero. Changing the split reallocates
future emission only — nothing already emitted moves.

| Signer    | Pallet     | Wraps                                          |
| --------- | ---------- | ---------------------------------------------- |
| `coldkey` | AdminUtils | `AdminUtils.sudo_set_mechanism_emission_split` |

## Parameters [#parameters]

| Parameter | Type             | Required | Description                                                                                          |
| --------- | ---------------- | -------- | ---------------------------------------------------------------------------------------------------- |
| `netuid`  | integer          | yes      | Subnet to configure; the signer must be its owner.                                                   |
| `split`   | array of integer | yes      | u16 emission weights in mechanism order, summing to exactly 65,535; at most one entry per mechanism. |

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

## CLI [#cli]

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

```bash
btcli tx set-mechanism-emission-split \
  --netuid <int> \
  --split <a,b,c> --dry-run
btcli tx set-mechanism-emission-split \
  --netuid <int> \
  --split <a,b,c> -w my_coldkey
```

## Python [#python]

```python
import bittensor as sub
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = sub.SetMechanismEmissionSplit(netuid=1, split=[...])

async with sub.Client("finney") as client:
    plan = await client.plan(intent, wallet)   # fee, effects, policy — no submission
    result = await client.execute(intent, wallet)
    if not result.success:
        print(result.error.code, result.error.remediation)
```

Or build it by op name, as an agent would:

```python
await client.execute_tool("set_mechanism_emission_split", {...}, wallet)
```