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First Flight #43
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Submission Details
Impact: low
Likelihood: low
Invalid

Missing NatSpec Documentation + Poor Maintainability

blee

Description

  • Smart contracts should have comprehensive documentation for better understanding and maintainability.

  • The contract lacks NatSpec documentation for most functions, parameters, and return values, making it difficult for developers to understand and maintain.

@> function createSellOrder(
address _tokenToSell,
uint256 _amountToSell,
uint256 _priceInUSDC,
uint256 _deadlineDuration
@> ) public returns (uint256) {
// No @dev, @param, @return documentation
}
​
@> function amendSellOrder(
uint256 _orderId,
uint256 _newAmountToSell,
uint256 _newPriceInUSDC,
uint256 _newDeadlineDuration
@> ) public {
// No documentation explaining the amendment logic
}

Risk

Likelihood:

  • Every time a developer tries to understand the contract

  • When integrating with external systems or dApps

  • During code reviews and security audits

Impact:

  • Increased development time and potential for misunderstanding

  • Higher chance of integration errors by external developers

  • Reduced code quality and maintainability

Proof of Concept

Documentation Gap Analysis: This demonstrates the lack of essential information for developers.

// Current state: No documentation
function buyOrder(uint256 _orderId) public {
​
// What developers need to know but isn't documented:
// - What happens if order is expired?
// - What are the fee calculations?
// - What tokens get transferred and to whom?
// - What events are emitted?
// - What are the revert conditions?

Missing documentation impacts:

  • Integration difficulty: dApp developers can't understand function behavior without reading source code

  • Parameter confusion: No guidance on expected input formats or ranges

  • Error handling: No documentation of revert conditions or error types

  • Business logic: Fee calculations and token transfer flows are unclear

  • Security implications: Developers may not understand access control or state changes

Recommended Mitigation

Solution: Add comprehensive NatSpec documentation to all public functions.

+ /**
+ * @dev Creates a new sell order for the specified token
+ * @param _tokenToSell Address of the ERC20 token to sell (must be in allowlist)
+ * @param _amountToSell Amount of tokens to sell (in token's native decimals)
+ * @param _priceInUSDC Total price in USDC (6 decimals) for the entire amount
+ * @param _deadlineDuration Duration in seconds from now when order expires (max 3 days)
+ * @return orderId The unique identifier for the created order
+ * @notice Seller must approve this contract to spend _amountToSell tokens before calling
+ * @notice Order can be amended or cancelled before expiration or purchase
+ */
function createSellOrder(
address _tokenToSell,
uint256 _amountToSell,
uint256 _priceInUSDC,
uint256 _deadlineDuration
) public returns (uint256) {
​
+ /**
+ * @dev Purchases an active order, transferring tokens and paying seller/protocol
+ * @param _orderId The unique identifier of the order to purchase
+ * @notice Buyer pays 3% protocol fee + seller amount in USDC
+ * @notice Order must be active and not expired
+ * @notice Buyer receives the full amount of tokens specified in order
+ */
function buyOrder(uint256 _orderId) public {

Why this works:

  • Clear expectations: Developers understand exactly what functions do and require

  • Parameter guidance: Detailed parameter descriptions prevent integration errors

  • Business logic documentation: Fee calculations and token flows are explicitly stated

  • Usage instructions: @notice tags provide practical guidance for implementation

  • Tool integration: NatSpec generates automatic documentation for development tools

Complete documentation should include:

  • All function parameters and return values

  • Business logic explanations (fees, transfers, state changes)

  • Revert conditions and error handling

  • Access control requirements

  • Event emission details

  • Usage examples where helpful

Updates

Lead Judging Commences

yeahchibyke Lead Judge 8 days ago
Submission Judgement Published
Invalidated
Reason: Non-acceptable severity

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