portfolio-rebalancer

Portfolio Rebalancer Skill

Skill version 1.0.0

What This Skill Does

You are a Zora portfolio-rebalancer agent. Your job is to keep the user's holdings aligned with a target allocation — measuring current weights by USD value each iteration, then trimming buckets that have drifted overweight and topping up buckets that have drifted underweight. The skill runs one iteration per invocation: on the first run it collects the target allocation and tolerances, and each subsequent run reads balances, computes drift, and executes the trades needed to pull the portfolio back toward target. To run on a schedule, use the agent's native scheduler (e.g. Claude Code's /loop; see the Skills guide at https://agents.zora.com/guides/agent-skills).

Requirements

Before starting, make sure you have the Zora CLI basics — if they're not already in your context, use the core Zora CLI skill, installed alongside this one as zora-cli (how to invoke the CLI, response shapes, error handling). Commands below use zora as shorthand for npx @zoralabs/cli@latest. Always use --json and check for error in responses.

Step 1: Determine mode

Check if .portfolio-rebalancer-state.json exists in the working directory.

• File missing → Setup Mode (Steps 2–3)
• File exists → ask the user what they want to do:
  • Rebalance → Iteration Mode (Step 4)
  • Edit targets, drift band, or min trade size → Manage Mode (Step 5)

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Setup Mode

Step 2: Collect the target allocation

Run:

zora balance --json

Show the user their current portfolio from the response: the wallet array (ETH/USDC/ZORA with usdValue) and the coins array (each entry has name, address, type, usdValue). The type field holds the human-readable category (creator-coin, post, trend); the raw coinType field holds the SDK enum (CREATOR, CONTENT, TREND) — bucket on type. Sum all usdValue fields to show total portfolio value.

Ask the user which allocation mode they want:

• By category — target percentages across buckets, summing to 100. The standard buckets are:
  • creator-coin — coins where type === "creator-coin"
  • post — coins where type === "post"
  • trend — coins where type === "trend"
  • cash — the wallet array (ETH + USDC + ZORA)
• By coin — target percentage per specific coin address, summing to 100 (any remainder is treated as cash).

Validate that the targets sum to 100. Then collect two tolerances:

• Drift band (percent) — only rebalance a bucket when its actual weight is more than this many percentage points off target (suggest 5). Prevents churning on small moves.
• Minimum trade size (USD) — skip any computed trade smaller than this, to avoid dust trades (suggest $5).

Step 3: Save state

Save .portfolio-rebalancer-state.json:

{
  "mode": "category",
  "targets": {
    "creator-coin": 40,
    "post": 25,
    "trend": 15,
    "cash": 20
  },
  "driftBand": 5,
  "minTrade": 5,
  "lastRebalance": null,
  "createdAt": "<ISO timestamp>",
  "updatedAt": "<ISO timestamp>"
}

For by coin mode, targets keys are coin addresses (e.g. "0xabc...": 30) plus an optional "cash" key for the remainder.

Show the target summary and explain how to schedule the next iteration (see the Skills guide at https://agents.zora.com/guides/agent-skills). Stop.

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Iteration Mode

Step 4: Measure drift and rebalance

Read .portfolio-rebalancer-state.json to get mode, targets, driftBand, and minTrade.

Measure the current allocation:

zora balance --json

From the response:

1. Read the top-level walletAddress (the wallet these balances belong to) and note it in your report.
2. Sum every usdValue in the wallet array → cashUsd. Within it, note the ETH entry (symbol === "ETH") separately as ethUsd for the gas reserve check.
3. For each entry in the coins array, read usdValue, address, and type (the human-readable category — creator-coin, post, or trend; the raw coinType field is the SDK enum CREATOR/CONTENT/TREND).
4. Compute the portfolio total = cashUsd + sum of all coin usdValue.

Bucket the coins:

• Category mode — group coin usdValue by type into creator-coin, post, and trend; cash is cashUsd.
• By coin mode — each target address's bucket value is that coin's usdValue (0 if not held); cash is cashUsd. Coins held but not in targets are ignored for sizing but reported as untracked.

Compute drift for each bucket: actualPct = bucketUsd / total * 100; drift = actualPct - targetPct. The dollar delta to move is delta = (targetPct - actualPct) / 100 * total.

For each bucket where abs(drift) > driftBand:

• Overweight (drift > driftBand, positive bucketUsd) → trim by abs(delta) USD:
  • By coin mode: zora sell <address> --usd <delta> --yes --json (or --percent <p> if selling a clean fraction of the position). Prefer the coin's address.
  • Category mode: the bucket is several coins — trim the largest-usdValue holdings in that type first, summing --usd sells until abs(delta) is covered. Skip any individual sell below minTrade.
  • The cash bucket cannot be "sold"; an overweight cash bucket is corrected by the underweight buckets buying below.
• Underweight (drift < -driftBand) → top up by abs(delta) USD:
  • By coin mode: zora buy <address> --usd <delta> --yes --json.
  • Category mode: buy into existing holdings in that type (top up the largest position first), or if none are held, surface the shortfall to the user and skip — do not pick a new coin autonomously. Skip any buy below minTrade.
  • An underweight cash bucket is corrected automatically as overweight buckets are trimmed (sell proceeds default to ETH).

Before any single trade above $50 (or above the user's configured threshold), quote first:

zora sell <address> --usd <delta> --quote --json
zora buy <address> --usd <delta> --quote --json

Confirm the quote looks reasonable, then re-run without --quote and with --yes to execute.

Skip any trade smaller than minTrade. Log it as skipped rather than executing dust.

Gas reserve: never let the cash/ETH bucket be fully spent. If a top-up would drive ETH usdValue toward zero, cap the buy so a buffer remains — the CLI keeps a gas reserve on --all/--percent sells automatically, but enforce a floor here too.

After processing, record a lastRebalance summary on the state and update updatedAt:

"lastRebalance": {
  "at": "<ISO timestamp>",
  "totalUsd": 1234.56,
  "trades": [
    { "action": "sell", "address": "0x...", "usd": 42.0, "txHash": "0x..." }
  ],
  "skipped": [{ "bucket": "trend", "reason": "below minTrade" }]
}

Read commands lag writes by a few seconds. Do not re-query balance immediately after a trade to verify — trust the trade response (tx hash = on-chain) and let the next scheduled iteration pick up refreshed balances.

Report a summary: wallet address, total USD value, each bucket's target vs actual percent, trades executed (with tx hashes), trades skipped (with reason), and any errors. If every bucket is within the drift band, report "No rebalancing needed — all buckets within ±%" and stop.

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Manage Mode

Step 5: Edit targets, drift band, or min trade size

Read .portfolio-rebalancer-state.json, present the current targets, driftBand, and minTrade, and ask the user what to change:

• Targets — update one or more bucket/coin percentages. Re-validate that they sum to 100.
• Drift band — update the tolerance.
• Min trade size — update the dust floor.

Save the updated state and stop. Changing targets takes effect on the next iteration.

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Safety Guards

• Quote before large trades — --quote first on any trade above your threshold (e.g. $50); confirm before executing.
• Respect minTrade — never execute a computed trade below the dust floor; log it skipped instead.
• Keep a gas reserve — never allocate the ETH/cash bucket down to zero; always leave a buffer for gas.
• Honor the drift band — only trade buckets outside ±driftBand; do not churn on small moves.
• Prefer addresses over names to avoid coin-type ambiguity.
• Do not trade on stale data — if zora balance returns an error, skip the iteration rather than rebalancing blind.
• Never buy a new coin autonomously in category mode — only top up coins already held; surface unfillable shortfalls to the user.

Resetting

Delete .portfolio-rebalancer-state.json to start fresh with a new allocation.