Token Swap Skill

CRITICAL RULES

1. ONE TASK AT A TIME. Only do the work described in the CURRENT task. Do NOT work ahead.
2. Do NOT call say_to_user with finished_task: true until the current task is truly done. Using finished_task: true advances the task queue — if you use it prematurely, tasks get skipped.
3. Use say_to_user WITHOUT finished_task for progress updates. Only set finished_task: true OR call task_fully_completed when ALL steps in the current task are done.
4. Sequential tool calls only. Never call two tools in parallel when the second depends on the first (e.g., never call swap_execute and decode_calldata in the same response).
5. Use exact parameter values shown. Especially cache_as: "swap" — not "swap_params", not "swap_data", exactly "swap".

Step 1: Define the seven tasks

Call define_tasks with all 7 tasks in order:

{"tool": "define_tasks", "tasks": [
  "TASK 1 — Prepare: select network, look up sell+buy tokens, check AllowanceHolder allowance. See swap skill 'Task 1'.",
  "TASK 2 — Approve AllowanceHolder (SKIP if allowance sufficient): call erc20_approve_swap, broadcast, wait for confirmation. See swap skill 'Task 2'.",
  "TASK 3 — Convert amount: call to_raw_amount to convert sell amount to raw units. See swap skill 'Task 3'.",
  "TASK 4 — Fetch quote: call x402_preset_fetch with preset swap_quote. See swap skill 'Task 4'.",
  "TASK 5 — Decode quote: call decode_calldata with calldata_register='swap_quote' and cache_as='swap'. This sets swap_contract. See swap skill 'Task 5'.",
  "TASK 6 — Execute swap: call swap_execute preset THEN broadcast_web3_tx. Do NOT call decode_calldata here. See swap skill 'Task 6'.",
  "TASK 7 — Verify the swap result and report to the user. See swap skill 'Task 7'."
]}

Task 1: Prepare — look up tokens, check balances, check allowance

1a. Select network (if user specified one)

{"tool": "select_web3_network", "network": "<network>"}

1b. Look up SELL token

{"tool": "token_lookup", "symbol": "<SELL_TOKEN>", "cache_as": "sell_token"}

If selling ETH: use WETH as the sell token instead:

1. Lookup WETH: {"tool": "token_lookup", "symbol": "WETH", "cache_as": "sell_token"}
2. Check WETH balance: {"tool": "web3_preset_function_call", "preset": "weth_balance", "network": "<network>", "call_only": true}
3. Check ETH balance: {"tool": "x402_rpc", "preset": "get_balance", "network": "<network>"}
4. If WETH insufficient, wrap:
   • {"tool": "to_raw_amount", "amount": "<human_amount>", "decimals": 18, "cache_as": "wrap_amount"}
   • {"tool": "web3_preset_function_call", "preset": "weth_deposit", "network": "<network>"}
   • Broadcast the wrap tx and wait for confirmation

1c. Look up BUY token

{"tool": "token_lookup", "symbol": "<BUY_TOKEN>", "cache_as": "buy_token"}

1d. Check AllowanceHolder allowance

{"tool": "web3_preset_function_call", "preset": "erc20_allowance_swap", "network": "<network>", "call_only": true}

Do NOT proceed to approval or quoting in this task. Just report findings.

Task 2: Approve sell token for AllowanceHolder

If Task 1 determined allowance is already sufficient, SKIP this task:

{"tool": "task_fully_completed", "summary": "Allowance already sufficient — skipping approval."}

Otherwise, approve:

{"tool": "web3_preset_function_call", "preset": "erc20_approve_swap", "network": "<network>"}

Broadcast and wait for confirmation:

{"tool": "broadcast_web3_tx", "uuid": "<uuid_from_approve>"}

After the approval is confirmed:

{"tool": "task_fully_completed", "summary": "Sell token approved for AllowanceHolder. Ready for quote."}

Task 3: Convert sell amount to raw units

One tool call (auto-completes on success):

{"tool": "to_raw_amount", "amount": "<human_amount>", "decimals_register": "sell_token_decimals", "cache_as": "sell_amount"}

Task 4: Fetch swap quote

One tool call (auto-completes on success):

{"tool": "x402_preset_fetch", "preset": "swap_quote", "cache_as": "swap_quote", "network": "<network>"}

If this fails after retries, STOP and tell the user.

Task 5: Decode the swap quote

IMPORTANT: Use calldata_register (NOT raw calldata). Use cache_as: "swap" exactly.

This step reads the swap_quote register and extracts: swap_contract, swap_param_0–swap_param_4, swap_value. Task 6 depends on these registers being set.

One tool call (auto-completes on success):

{"tool": "decode_calldata", "abi": "0x_settler", "calldata_register": "swap_quote", "cache_as": "swap"}

Task 6: Execute the swap

Exactly 2 tool calls, SEQUENTIALLY (one at a time, NOT in parallel):

Do NOT call decode_calldata in this task — it was already done in Task 5. The registers swap_contract, swap_param_0–swap_param_4, swap_value should already be set.

6a. Create the swap transaction (FIRST call)

{"tool": "web3_preset_function_call", "preset": "swap_execute", "network": "<network>"}

Wait for the result. Extract the uuid from the response.

6b. Broadcast it (SECOND call — after 6a succeeds)

{"tool": "broadcast_web3_tx", "uuid": "<uuid_from_6a>"}

The task auto-completes when broadcast_web3_tx succeeds.

Task 7: Verify the swap

Call verify_tx_broadcast to poll for the receipt, decode token transfer events, and confirm the result matches the user's intent:

{"tool": "verify_tx_broadcast"}

Read the output:

• "TRANSACTION VERIFIED" → The swap succeeded AND the AI confirmed it matches the user's intent. Report success with tx hash and explorer link.
• "TRANSACTION CONFIRMED — INTENT MISMATCH" → Confirmed on-chain but AI flagged a concern. Tell the user to check the explorer.
• "TRANSACTION REVERTED" → The swap failed. Tell the user.
• "CONFIRMATION TIMEOUT" → Tell the user to check the explorer link.

Call task_fully_completed when verify_tx_broadcast returned VERIFIED or CONFIRMED.