0x-shashi/skills/advanced/context-detection

Context Detection Skill

Purpose

Automatically identify the type of protocol being audited to load appropriate checklists, templates, and vulnerability patterns without manual configuration.

Detection Signals

DeFi Lending Protocol

Signals:
- Functions: deposit, withdraw, borrow, repay, liquidate
- State: collateralFactor, borrowRate, totalBorrows, totalReserves
- Imports: InterestRateModel, PriceOracle
- Patterns: health factor calculations, LTV ratios
→ Load: lending-template, defi-lending-checklist, oracle-chains

DEX / AMM

Signals:
- Functions: swap, addLiquidity, removeLiquidity, getAmountOut
- State: reserve0, reserve1, totalLiquidity, fee
- Imports: IUniswapV2Pair, IUniswapV3Pool
- Patterns: constant product (x*y=k), concentrated liquidity, tick math
→ Load: amm-dex-template, dex-amm-checklist, flash-loan-chains

Bridge

Signals:
- Functions: sendMessage, receiveMessage, relayMessage, verifyProof
- State: nonce, messageHash, guardians, threshold
- Imports: MessageVerifier, CrossChainMessenger
- Patterns: lock-mint-burn-unlock, validator signatures
→ Load: bridge-template, bridge-checklist, bridge-chains

Governance

Signals:
- Functions: propose, vote, execute, queue, cancel
- State: proposals, votingPower, quorum, timelock
- Imports: GovernorAlpha, GovernorBravo, TimelockController
- Patterns: proposal lifecycle, voting snapshots, delegation
→ Load: governance-checklist, governance-chains

Staking

Signals:
- Functions: stake, unstake, claim, getReward
- State: rewardRate, rewardPerToken, totalStaked
- Imports: StakingRewards, MasterChef
- Patterns: reward accumulation per share, lock periods
→ Load: staking-template, staking-checklist

NFT / Gaming

Signals:
- Functions: mint, burn, tokenURI, onERC721Received
- State: tokenId, baseURI, maxSupply, royaltyInfo
- Imports: ERC721, ERC1155, VRF
- Patterns: merkle proof minting, reveal mechanics, randomness
→ Load: nft-marketplace-template, nft-gaming-checklist

Vault / Yield

Signals:
- Functions: deposit, withdraw, harvest, compound
- State: totalAssets, totalShares, strategy
- Imports: ERC4626, Strategy
- Patterns: share/asset conversion, yield strategies
→ Load: defi-patterns, staking-checklist

Detection Algorithm

1. Scan all contract interfaces (function signatures)
2. Scan import statements
3. Scan state variable names
4. Match against known protocol type signatures
5. Return ranked list of protocol types with confidence scores
6. Load templates for highest-confidence match

Multiple Protocol Types

Many protocols combine multiple types (e.g., lending + staking + governance). When multiple types detected:

1. Load ALL matching templates
2. Prioritize by detection confidence
3. Add cross-module interaction checks
4. Apply comprehensive checklist as baseline

Prerequisites

Context detection requires access to contract source code or verified ABI. The detection algorithm MUST have function signature databases loaded.

Validation

To verify detection accuracy, test against known protocol types:

# Validate detection signals
def test_lending_detection():
    signals = detect_protocol("contracts/LendingPool.sol")
    assert signals['type'] == 'lending'
    assert signals['confidence'] > 0.85
    print(f"Detection verified: {signals['type']} ({signals['confidence']:.2f})")

# Expected detection outcome for Uniswap V2 Pair
input: UniswapV2Pair.sol
expected:
  type: amm-dex
  confidence: 0.95
  signals: [swap, addLiquidity, reserve0, reserve1]
  templates: [amm-dex-template, dex-amm-checklist]

# Run detection test suite
python -m pytest tests/context_detection/ -v

Behavior Guidelines

• Detection MUST run before loading any protocol-specific templates
• Protocols with confidence below 0.5 should use the comprehensive checklist as fallback
• Multi-type protocols ALWAYS load all matching templates
• Manual override is optionally available when automated detection is uncertain

References

• Context Detection References - Function signature databases and classification trees