Agent skill
static-analysis
Integrate automated static analysis tools (Slither, Mythril, Aderyn, Semgrep) into the audit workflow to catch known vulnerability patterns before manual review. Use when starting an audit to establish a coverage baseline, or when configuring static analysis tooling for a project.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/static-analysis
SKILL.md
Static Analysis Skill
Integrate automated static analysis tools into the audit workflow to catch low-hanging vulnerabilities before manual review. Static analysis should be the FIRST step after compilation — it surfaces issues that automated tools excel at finding, freeing manual review time for complex logic and economic vulnerabilities.
Why Static Analysis First?
| Benefit | Details |
|---|---|
| Coverage baseline | Ensures known vulnerability patterns are checked across ALL functions |
| Prioritization | Findings direct manual reviewer to highest-risk areas |
| Speed | Minutes vs hours/days for manual review |
| Consistency | Never misses a pattern it knows about (humans do) |
| Documentation | Generates structured output for audit reports |
Detection Capabilities
What Static Analysis Catches Well
| Category | Examples |
|---|---|
| Reentrancy | All variants: ETH, ERC-20, cross-function, read-only |
| Unchecked calls | Missing return value checks on transfer, send, low-level call |
| Access control | Unprotected selfdestruct, missing modifiers, tx.origin auth |
| State issues | Uninitialized storage, shadowed variables, redundant state |
| Dangerous patterns | Controlled delegatecall, hardcoded gas, block.timestamp dependency |
| Code quality | Floating pragma, unused variables, dead code, naming conventions |
| Standard compliance | ERC-20 / ERC-721 interface compliance |
| Compiler issues | Use of deprecated patterns, assembly without memory safety |
What Static Analysis Misses
| Category | Why |
|---|---|
| Business logic | Tools don't understand protocol semantics |
| Economic attacks | Flash loan manipulation, oracle gaming |
| Cross-contract interactions | Limited to single-contract analysis (mostly) |
| Governance attacks | Vote manipulation, proposal hijacking |
| MEV / sandwich | Requires mempool context |
| Timing attacks | Cross-block state dependencies |
| Complex math errors | Rounding, precision loss in multi-step calculations |
Tool Comparison
| Tool | Language | Approach | Speed | False Positives | Best For |
|---|---|---|---|---|---|
| Slither | Python | AST + data flow | Fast (seconds) | Low-Medium | Broad vulnerability detection, code quality |
| Mythril | Python | Symbolic execution + SMT | Slow (minutes-hours) | Low | Deep state reachability, proving exploitability |
| Aderyn | Rust | AST analysis | Very fast | Low | Quick scans, CI/CD integration |
| Semgrep | Python | Pattern matching | Fast | Depends on rules | Custom rules, org-specific patterns |
| Foundry invariant tests | Solidity | Fuzzing | Medium | Very low | Invariant verification |
| Echidna | Haskell | Property-based fuzzing | Slow | Very low | Finding edge cases in complex state |
| Medusa | Go | Parallel fuzzing | Medium | Very low | Faster alternative to Echidna |
Recommended Workflow
1. Slither (always — fast, broad coverage)
│
2. Aderyn (always — fast, complementary detectors)
│
3. Semgrep with custom rules (if org has rules)
│
4. Mythril (selectively — on high-risk functions only)
│
5. Echidna/Medusa (if invariant tests needed)
Slither Quick Reference
Installation
pip install slither-analyzer
# Requires solc installed (managed by solc-select)
pip install solc-select
solc-select install 0.8.20
solc-select use 0.8.20
Common Commands
# Full scan
slither .
# Filter out dependencies
slither . --filter-paths "node_modules|lib|test"
# Specific detectors
slither . --detect reentrancy-eth,arbitrary-send-eth,controlled-delegatecall
# JSON output
slither . --json output.json
# Code analysis printers
slither . --print contract-summary
slither . --print function-summary
slither . --print inheritance-graph
slither . --print call-graph
slither . --print variable-order # Storage layout
Aderyn Quick Reference
Installation
cargo install aderyn
# Or via npm
npm install -g aderyn
Usage
# Full scan
aderyn .
# Specific scope
aderyn . --src src/
# Markdown output
aderyn . --output report.md
Key Detectors
| Detector | Description |
|---|---|
centralization-risk |
Functions callable by single address |
unsafe-erc20-functions |
Direct transfer/approve without Safe wrapper |
push-0 |
PUSH0 opcode incompatible with older EVM versions |
solmate-safe-transfer-lib |
Solmate SafeTransferLib doesn't check contract existence |
unprotected-init |
Missing initializer guard |
Semgrep Quick Reference
# Install
pip install semgrep
# Run with Solidity rules
semgrep --config "p/solidity" .
# Custom rule example
semgrep --config custom-rules/ .
Custom Rule Example
rules:
- id: unchecked-low-level-call
patterns:
- pattern: |
(bool $SUCCESS, ) = $ADDR.call{...}(...);
- pattern-not-inside: |
require($SUCCESS, ...);
message: "Low-level call return value not checked"
severity: ERROR
languages: [solidity]
Resources
- Slither Guide — Full configuration, detectors, triage
Workflows
- Static Analysis Workflow — Step-by-step process
Recommended Agent Skills
Expand your agent's capabilities with these related and highly-rated skills.
majiayu000/claude-skill-registry
agent-ops-spec
Manage specification documents in .agent/specs/. Use when user provides requirements, acceptance criteria, or feature descriptions that need to be tracked and validated against implementation.
majiayu000/claude-skill-registry
agent-ops-state
Maintain .agent state files. Use at session start, after meaningful steps, and before concluding: read/update constitution/memory/focus/issues/baseline consistently.
majiayu000/claude-skill-registry
agent-ops-spec
Manage specification documents in .agent/specs/. Use when user provides requirements, acceptance criteria, or feature descriptions that need to be tracked and validated against implementation.
majiayu000/claude-skill-registry
agent-ops-testing
Test strategy, execution, and coverage analysis. Use when designing tests, running test suites, or analyzing test results beyond baseline checks.
majiayu000/claude-skill-registry
agent-ops-testing
Test strategy, execution, and coverage analysis. Use when designing tests, running test suites, or analyzing test results beyond baseline checks.
majiayu000/claude-skill-registry
agent-ops-state
Maintain .agent state files. Use at session start, after meaningful steps, and before concluding: read/update constitution/memory/focus/issues/baseline consistently.
Didn't find tool you were looking for?