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 skills add krzysu/cow-mcp --skill cow-swapgit clone --depth 1 https://github.com/krzysu/cow-mcpWrote 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/krzysu/cow-mcp/cow-swap)<a href="https://agentmods.dev/skills/krzysu/cow-mcp/cow-swap"><img src="https://agentmods.dev/badge/skills/krzysu/cow-mcp/cow-swap/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/krzysu/cow-mcp/cow-swap"><img src="https://agentmods.dev/badge/skills/krzysu/cow-mcp/cow-swap.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00085 | $0.02424 |
| Opus 5 | $0.00043 | $0.01212 |
| Sonnet 5 | $0.00017 | $0.00485 |
| Haiku 4.5 | $0.00009 | $0.00242 |
Grade A, and why
cow-swap 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cow-swap
You are placing a CoW Protocol swap on behalf of the user. cow-mcp gives you the read/build/submit tools, but never signs. Your job is to drive the multi-step flow, decide when each tool fires, and route the signing step to the right place.
High-level flow
1. Parse intent → chainId, sellToken, buyToken, kind, amount, from
2. Quote → cow_get_quote
3. Confirm → show price, fee, slippage; get user OK
4. Approval gate → cow_check_approval; if needed, cow_build_approval and wait for on-chain confirm
5. Build order → cow_build_order (returns typedData)
6. Sign → route to signer (see below)
7. Submit → cow_submit_order (returns uid)
8. Check status → cow_get_order until fulfilled / expired / cancelled
Each numbered step has a decision gate — don't skip ahead. The user can change their mind at any step; if they do, restart from the relevant step rather than resuming a stale state.
Step 1 — parse intent
Resolve every required field before calling any tool. All six must be set before step 2 — if any is missing, ask the user; do not guess.
chainId— default to 1 (Ethereum). If the user says a chain by name ("on Arbitrum"), map it; if unsure, callcow_list_chainsand ask.sellToken/buyToken— accept symbols (WETH,USDC) or0xaddresses. cow-mcp resolves symbols per chain. If the user wants to sell native ETH (no WETH on hand), this skill does not support it — CoW Eth Flow handles that path by atomically wrapping + ordering, but cow-mcp doesn't expose Eth Flow yet. Either ask the user to wrap to WETH first, or decline. Buying native ETH is fine — just pass the sentinel0xeeee…eeee(or omit abuyTokensymbol; the orderbook auto-resolves).kind—"sell"(lock in sellAmount, accept variable buyAmount) or"buy"(lock in buyAmount, accept variable sellAmount). Phrase like "swap X for Y" → sell; "buy X paying Y" → buy.amount— base units, decimal string. Convert from human input using token decimals (cow_list_tokensif you don't already know).from— the signer / order owner address. Required for build and submit. If missing, ask the user.
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.
- 12d ago First seen · 130 lines · 85 tokens per session scan A b3d3e051c24b
cow-swap is a skill published in the GitHub repository krzysu/cow-mcp (0 stars, last pushed 4mo ago), licensed MIT. It adds 85 tokens to every session and 2,424 once invoked, about $0.0004 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
bridge
Cross-chain token transfers using Wormhole and CCTP.
hyperliquid
Hyperliquid L1 perps DEX (69% market share).
mpp-agent
Pay HTTP 402 APIs via Machine Payments Protocol (MPP).
marginfi
MarginFi — Solana lending and borrowing.
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…
trading-signal
Subscribe and retrieve on-chain Smart Money signals. Monitor trading activities of smart money addresses, including buy/sell signals, trigger price, current price, max gain, and exit rate. Use this skill when users are looking for investment opportunities — smart money signals can serve as valuable references for…