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 mtarcure/claude-vibe-squad --skill chain-construct-smart-contractgit clone --depth 1 https://github.com/mtarcure/claude-vibe-squadWrote 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/mtarcure/claude-vibe-squad/chain-construct-smart-contract)<a href="https://agentmods.dev/skills/mtarcure/claude-vibe-squad/chain-construct-smart-contract"><img src="https://agentmods.dev/badge/skills/mtarcure/claude-vibe-squad/chain-construct-smart-contract/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/mtarcure/claude-vibe-squad/chain-construct-smart-contract"><img src="https://agentmods.dev/badge/skills/mtarcure/claude-vibe-squad/chain-construct-smart-contract.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 | $0.00090 | $0.01407 |
| Opus 5.5 | $0.00036 | $0.00563 |
| Sonnet 5.5 | $0.00018 | $0.00281 |
| Haiku 4.5 | $0.00009 | $0.00141 |
Grade A, and why
chain-construct-smart-contract 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 1mo 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 — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
chain-construct-smart-contract
Smart-contract specialization of chain-construct for exploit-developer: build multi-step
attack call sequences for on-chain vulnerabilities and prove them with a passing Forge (EVM) or
LiteSVM/Trident (Solana) reproduction. Follow the generic chain-construct method (objective as
end-state, chain head, state-feeds ordering, prove-don't-assert); this skill adds the
EVM/Solana chain primitives. Where the two conflict, the contract-level guidance here wins for
smart-contract targets. All tools are native host CLIs (forge, cargo test/litesvm,
trident, cargo-fuzz, anchor) — no wrapper layer.
Chain primitives — EVM
Reentrancy chain: deploy an attacker contract whose receive()/fallback() re-enters the
target; call the withdrawable function; re-enter before the balance is decremented; repeat
until drained. Scaffold: test/attack/AttackerReentrant.sol + a Forge test.
Flash-loan chain: borrow asset X (Aave/Uniswap V3 callback); in the callback manipulate
target state (price oracle, reserve ratio, collateral); extract profit; repay loan + fee.
Scaffold: FlashLoanAttacker.sol implementing IERC3156FlashBorrower or a Uniswap V3
flash callback.
Delegatecall-overwrite chain: find an unprotected delegatecall to a caller-controlled
address; supply a malicious implementation that overwrites slot 0 (owner/admin); call a
privileged function. Scaffold: a Forge fuzz test supplying arbitrary impl_addr.
Proxy-upgrade chain: find a UUPS/Transparent proxy with a bypassable upgrade guard (missing
onlyOwner, missing _authorizeUpgrade override); upgradeTo(malicious_impl); drain from the
new implementation. Scaffold: a Forge test with a MaliciousImpl.
Chain primitives — Solana
CPI privilege-escalation chain: find an instruction that makes a CPI with caller-controlled
signer_seeds; derive a PDA whose seeds match a privileged authority; call with the crafted
seeds so the program signs on that authority's behalf. Scaffold: a Trident FuzzInstruction
supplying crafted seed arrays, or a LiteSVM test.
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.
- 1mo ago First seen · 115 lines · 90 tokens per session scan A 44f14ea5e99b
chain-construct-smart-contract is a skill published in the GitHub repository mtarcure/claude-vibe-squad (165 stars, last pushed 1mo ago), licensed MIT. It adds 90 tokens to every session and 1,407 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-09-19.
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