Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/yaklang/hack-skills/defi-attack-patternsnpx skills add yaklang/hack-skills --skill defi-attack-patternsgit clone --depth 1 https://github.com/yaklang/hack-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/yaklang/hack-skills/defi-attack-patterns)<a href="https://agentmods.dev/skills/yaklang/hack-skills/defi-attack-patterns"><img src="https://agentmods.dev/badge/skills/yaklang/hack-skills/defi-attack-patterns.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00046 | $0.03343 |
| Opus 5 | $0.00023 | $0.01672 |
| Sonnet 5 | $0.00009 | $0.00669 |
| Haiku 4.5 | $0.00005 | $0.00334 |
Grade A, and why
defi-attack-patterns scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
3 near-identical copies found in the catalogue:
- defi-attack-patterns — 100% identical, 0 lines differ
- defi-attack-patterns — 100% identical, 0 lines differ
- defi-attack-patterns — 94% identical, 4 lines differ
How it starts
The opening of the file, as written. The whole thing — 356 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: DeFi Attack Patterns — Expert Attack Playbook
AI LOAD INSTRUCTION: Expert DeFi exploitation techniques. Covers flash loan mechanics, oracle manipulation (spot vs TWAP), MEV extraction (sandwich, JIT, liquidation), precision loss attacks, governance exploits, bridge vulnerabilities, and token standard pitfalls. Base models often miss the single-transaction atomicity constraint of flash loans and the distinction between spot price and TWAP manipulation.
0. RELATED ROUTING
- smart-contract-vulnerabilities for underlying Solidity vulnerability patterns (reentrancy, integer overflow, delegatecall)
- deserialization-insecure when targeting off-chain bridge relayer or indexer infrastructure
1. FLASH LOAN ATTACKS
1.1 Mechanism
Flash loans provide uncollateralized borrowing within a single transaction. The entire borrow → use → repay cycle must complete atomically; if repayment fails, the transaction reverts as if nothing happened.
| Provider | Max Amount | Fee |
|---|---|---|
| Aave V3 | Pool liquidity per asset | 0.05% (can be 0 for approved borrowers) |
| dYdX | Pool liquidity | 0 (uses internal balance manipulation) |
| Uniswap V3 | Pool liquidity per pair | 0.3% (swap fee tier) |
| Balancer | Pool liquidity | Protocol-configurable |
1.2 Price Oracle Manipulation
1. Flash borrow 100,000 WETH
2. Swap 100,000 WETH → TOKEN on AMM_A
→ TOKEN spot price on AMM_A skyrockets
3. On Lending_Protocol (reads AMM_A spot price as oracle):
→ Deposit small TOKEN collateral (valued at inflated price)
→ Borrow large amount of WETH against it
4. Swap TOKEN back → WETH on AMM_A (restore price)
5. Repay flash loan (100,000 WETH + fee)
6. Keep borrowed WETH from Lending_Protocol minus collateral cost
Key insight: protocols using AMM spot reserves (getReserves()) as price oracles are vulnerable. Must use TWAP or external oracle (Chainlink).
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 356 lines · 46 tokens per session scan A 8b80984dea98
defi-attack-patterns is a skill published in the GitHub repository yaklang/hack-skills (2,043 stars, last pushed 2mo ago), licensed MIT. It adds 46 tokens to every session and 3,343 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
portfolio
Cross-chain DeFi portfolio discovery, rebalancing suggestions, and NEAR Intent construction. Activates when the user pastes a wallet address or asks about yield/positions/rebalancing. Bootstraps a per-user "portfolio" project, aggregates positions across all the user's addresses inside one project, and offers a…
memstack-business-scope-of-work
Use this skill when the user says 'scope of work', 'SOW', 'define scope', 'project scope', 'write SOW', 'scope document', or is defining project boundaries, deliverables, and acceptance criteria for a formal engagement. Do NOT use for proposals, contracts, or invoicing.
prompt-proximity-architecture
Turn an approved measurement charter, ICPs, and buyer jobs into a budget-aware prompt coverage blueprint across proximity bands, aided status, information acts, journey states, roles, locales, evidence grades, partitions, and measurement lanes. Use before prompt wording to define required, optional, and prohibited…
crypto-market-rank
Crypto market rankings and leaderboards. Query trending tokens, top searched tokens, Binance Alpha tokens, tokenized stocks, social hype sentiment ranks, smart money inflow token rankings, top meme token rankings from Pulse launchpad, and top trader PnL leaderboards. Use this skill when users ask about token rankings…
copy-trading
Wallet evaluation, monitoring, and copy-trade strategy design for Solana DEX trading.
strategy-framework
Standardized template for defining trading strategies with entry rules, exit rules, position sizing, risk parameters, and performance criteria.