Individual skill

reentrancy

Hunt and validate reentrancy bugs — classic cross-function, same-function, read-only, and cross-contract variants.

packages/decepticon/decepticon/skills/standard/contracts/reentrancy/SKILL.md

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SKILL.mdcore · 1,893 bytes
SKILL.mdcore · 1,893 bytes

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# Reentrancy Playbook

## Variants
1. **Classic** — external call before state update (The DAO)
2. **Cross-function** — A calls out, reentered into B which reads/writes A's state
3. **Read-only** — view function reads stale state during reentrancy, consumed by a second contract making decisions
4. **Cross-contract** — same attack pattern across protocol boundaries
5. **ERC777 / ERC1155 hook** — `onERC*Received` callback re-enters

## Audit steps
1. `solidity_scan_file` flags every `.call{value:...}` and `delegatecall`
2. For each hit, check:
   - Is there a state write BEFORE the external call?
   - Is `ReentrancyGuard`'s `nonReentrant` modifier applied?