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yoink

Skill17 starsChanged 5 months agoMITView on GitHub

Play Yoink, an onchain capture-the-flag game on Base. Yoink the flag from the current holder, check game stats and leaderboards, view player scores, and compete for the trophy. Uses Bankr for transaction execution.

  • Sends data out

3 other projects use a version of this.

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The file

We split this skill into the rules it gives an agent

4 rules. About 0 are common, 2 are distinctive, and 2 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈2

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Yoink the flag: - Call yoink() to take the flag from the current holder

    line 15
  2. Distinctive:

    Use Bankr's arbitrary transaction feature:

    line 46
  3. Distinctive:

    Ensure cooldown elapsed (600s) and you're not current holder

    line 69
  4. Very specific:

    Verify with lastYoinkedBy() or score(address)

    line 71

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Yoink

Play Yoink, an onchain capture-the-flag game on Base. Yoink the flag from the current holder to start your clock. The player with the most total yoinks holds the trophy.

Contract: 0x4bBFD120d9f352A0BEd7a014bd67913a2007a878 on Base (chain ID 8453)

Game Rules

  1. Yoink the flag - Call yoink() to take the flag from the current holder
  2. Cooldown - You must wait 10 minutes (600 seconds) between yoinks
  3. No self-yoink - You cannot yoink from yourself
  4. Accumulate time - While you hold the flag, your time score increases
  5. Compete for trophy - The player with the most total yoinks holds the trophy (token ID 2)
  6. Track yoinks - Your total yoink count is tracked separately from time

Contract Interface

RPC template:

curl -s -X POST https://mainnet.base.org -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x4bBFD120d9f352A0BEd7a014bd67913a2007a878","data":"SELECTOR+PARAMS"},"latest"],"id":1}' | jq -r '.result'
FunctionSelectorParamsReturns
yoink()0x9846cd9e-(write)
lastYoinkedBy()0xd4dbf9f4-address
lastYoinkedAt()0x6a99616f-uint256 timestamp
totalYoinks()0xa5d0dadd-uint256
topYoinker()0x6a974e6e-address (trophy holder)
mostYoinks()0xd2d7774a-uint256 (record)
COOLDOWN()0xa2724a4d-uint256 (600)
score(address)0x776f3843addr (32B padded)(yoinks, time, lastYoinkedAt)
balanceOf(address,uint256)0x00fdd58eaddr + tokenIduint256 (FLAG_ID=1, TROPHY_ID=2)

Encoding: Addresses are zero-padded to 32 bytes. score() returns 96 bytes (3 × uint256).

Yoinking

Use Bankr's arbitrary transaction feature:

{
  "to": "0x4bBFD120d9f352A0BEd7a014bd67913a2007a878",
  "data": "0x9846cd9e",
  "value": "0",
  "chainId": 8453
}

Errors

ErrorSelectorMeaning
SlowDown(uint256)0x58d6f4c6Cooldown not elapsed. Param = seconds remaining.
Unauthorized()0x82b42900You already hold the flag.

Cooldown check: current_time - lastYoinkedAt() >= 600

Workflow

  • Query lastYoinkedBy() and lastYoinkedAt() to check status/cooldown
  • Ensure cooldown elapsed (600s) and you're not current holder
  • Submit yoink transaction via Bankr
  • Verify with lastYoinkedBy() or score(address)

Resources

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