evm-cortex: Instructions file for Codex

AGENTS.md

evm-cortex AGENTS.md is an instructions file for Codex, OpenCode from ccashwell/evm-cortex. It costs 1,434 tokens per session, scanned C, original, MIT.

Instructions that turn a coding assistant into a team for Ethereum protocol work, including Solidity development, security review, DeFi integration, testing, and deployment. Ethereum is a blockchain platform, and Solidity is its main smart-contract language.

In plain words
What is it for?
Design protocols, write and optimize Solidity contracts, inspect storage and upgrade compatibility, audit security, integrate DeFi systems, and deploy contracts across networks.
Why use it?
They organize specialized responsibilities so a large smart-contract project can be designed, implemented, checked for security, and deployed with the relevant tools.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions CLAUDE.md; mentions Claude Code; mentions Codex.

This is ccashwell/evm-cortex's own configuration. It tells Codex and OpenCode how to work on evm-cortex itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything evm-cortex configures →

Reuse

Borrowing it

Nothing to install: this file belongs to ccashwell/evm-cortex. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ccashwell/evm-cortex/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/ccashwell/evm-cortex

Made for: Codex, OpenCode.

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Per session 1,434 This file is loaded in full into every session.
When invoked 1,434 The same file — it is already loaded in full.
Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01434 $0.01434
Opus 5.5 $0.00574 $0.00574
Sonnet 5.5 $0.00287 $0.00287
Haiku 4.5 $0.00143 $0.00143

Measured 1mo ago against content hash 82e1c2ccae62, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

evm-cortex AGENTS.md scanned grade C with 2 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

- **Foundry**: `curl -L https://foundry.paradigm.xyz | bash && foundryup`

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **Foundry**: `curl -L https://foundry.paradigm.xyz | bash && foundryup`
AGENTS.md · 141 lines

How it starts

The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.

EVM Cortex

Ethereum Protocol Engineering Squad

This file is for Codex CLI (OpenAI). If you're using Claude Code, see CLAUDE.md or just run ./install.sh.

What is this?

EVM Cortex turns your AI coding assistant into a specialized Ethereum protocol engineering team. Agents cover Solidity development, security auditing, DeFi integration, testing, and deployment -- everything needed to build, audit, and ship smart contracts.

Setup (Codex CLI)

./install-codex.sh

Prerequisites

  • Foundry: curl -L https://foundry.paradigm.xyz | bash && foundryup
  • Slither: pip install slither-analyzer
  • Aderyn (optional): cargo install aderyn

Agent Squads

Core Protocol Development

Agent Role
solidity-architect Protocol design, upgradeability, system architecture
solidity-engineer Implementation, best practices, NatSpec
gas-optimizer Gas profiling, optimization, assembly
contract-deployer Forge scripts, multi-chain deploy, verification
storage-layout-analyst Storage slots, packing, proxy compatibility
protocol-designer Mechanism design, game theory, incentives

Security Squad

Agent Role
audit-orchestrator Multi-phase audit pipeline (Light/Core/Thorough)
depth-state-trace State variable mutation tracing
depth-token-flow Token accounting, rounding, decimals
depth-edge-case Boundary conditions, empty state, extremes
depth-external External calls, reentrancy, callbacks
security-verifier PoC construction and verification
invariant-analyst Protocol invariant identification
access-control-reviewer Permission analysis, privilege escalation
oracle-analyst Price feed safety, manipulation resistance
mev-analyst Front-running, sandwich, MEV analysis

Testing Squad

Agent Role
foundry-tester Unit, fuzz, fork tests with Foundry
invariant-tester Stateful invariant testing
formal-verifier Certora, Halmos, symbolic execution
fuzzer Medusa, Echidna stateful fuzzing
poc-writer Exploit PoC development

Read the full file on GitHub · 141 lines

Changes

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.

  1. 1mo ago First seen · 141 lines · 1,434 tokens per session scan C 82e1c2ccae62

Subscribe to this mod's changes

evm-cortex AGENTS.md is an instructions file published in the GitHub repository ccashwell/evm-cortex (132 stars, last pushed 4d ago), licensed MIT. It adds 1,434 tokens to every session, about $0.0057 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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