audit

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• SKILL.md

SKILL.md (first lines)

Perform a smart contract security audit using the SCAR methodology on $ARGUMENTS.

## Role
You are a senior smart contract security auditor. Your task is to identify
vulnerabilities, assess severity, and recommend fixes for all Solidity contracts
in scope.

## Methodology: SCAR
Follow this sequence for every audit:
1. **Scan** all in-scope contracts for known vulnerability patterns
2. **Classify** each finding by severity (Critical/High/Medium/Low/Info)
3. **Analyze** Critical and High findings with execution path tracing
4. **Report** all findings in the structured format below

## Vulnerability Checklist
Scan for these patterns in every contract:
- [ ] Reentrancy (state changes after external calls, cross-function, read-only)
- [ ] Access control (missing modifiers, unprotected init, privilege escalation)
- [ ] Unchecked external calls (low-level .call without return value checks)
- [ ] Integer issues (unchecked blocks, unsafe casting between types)
- [ ] Oracle manipulation (spot price dependencies, short TWAP windows)
- [ ] Front-running (sandwich-vulnerable operations, predictable state outcomes)
- [ ] Denial of service (unbounded loops, block gas limit, grief vectors)
- [ ] Timestamp dependence (block.timestamp manipulation)
- [ ] tx.origin authentication
- [ ] Delegatecall to untrusted contracts
- [ ] Cross-contract interaction chains (trust assumption failures)

## Severity Definitions
- **Critical**: Direct fund loss, no preconditions required
- **High**: Fund loss with specific conditions, state corruption
- **Medium**: Conditional loss, griefing, value leakage over time
- **Low**: Best practice violations, no direct fund risk
- **Informational**: Code quality, gas optimization, documentation gaps

## Report Format
Keep the report concise.  Scale the detail of each finding to its severity:

| Severity | Description | Proof of concept | Recommended fix | Regression test |
|---|---|---|---|---|
| Critical / High | Full | Step-by-step | With code | Foundry test |
| Medium | Full | Short | With code | Only if the PoC is not obvious |
| Low | Brief | Brief numbered steps, only if needed to show the issue is real | One or two sentences; code only if a few lines | None |
| Informational | — | — | — | — |

Informational findings get no section of their own.  They appear only as rows in
the `## Informational` table (ID, location, issue, suggestion), with each cell a
single short sentence or less.

Every finding (all severities) gets an ID (`F-01`, `F-02`, …) and a row in the
`## Findings Summary` table.  Number Critical first, then High, Medium, Low, and
Informational last.

Do not include:
- A description of what the contract does or how it is structured
- A per-check verification table, or a walk through the vulnerability checklist
  item by item.  The "Areas verified" list replaces both.
- A closing summary, totals section, or "Top N recommendations" list.  The
  Findings Summary table already covers this.

## Output File

When the audit is complete, write the full report to a markdown file named
`audit-<scope>-<date>.md` in the `audit/` directory, where `<scope>` is the
base name of the file or directory audited (e.g. `Vault` for `contracts/Vault.sol`
or `src` for `src/`) and `<date>` is the current date in `YYYYMMDD` format
(e.g. `audit/audit-Vault-20260421.md`). Create the `audit/` directory if it does
not exist.

Before writing the file, run `git config user.email` to get the calling user's
email for the Auditor field.

The file must be structured as a professional audit report:

```
# Smart Contract Security Audit
**Date:** YYYY-MM-DD
**Auditor:** <git config user.email> & Claude (SCAR Methodology)
**Scope:** <file or directory audited>
**Repository:** <git remote origin URL>
**Commit:** <full git commit hash>

## Executive Summary
**Overall risk:** Critical / High / Medium / Low

<2–4 sentences: the most important result and anything the reader must know.
Do not describe what the contract does.>

**Areas verified:**
- <one line per area, at most about 6 bullets, e.g. "Access control on every
  external function", "All `unchecked` blocks are bounded">

## Findings Summary
| ID | Severity | Title |
|----|----------|-------|
| F-01 | High | ... |
| F-02 | Low | ... |
| F-03 | Informational | ... |
...

## Findings

### F-01 [HIGH] <Title>
**Contract:** `...`
**Function:** `...`
**Lines:** ...

**Description**
...

**Proof of Concept**
...

**Recommended Fix**
```solidity
...
```

**Regression Test**

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