Borrowing it
Nothing to install: this file belongs to farcasterxyz/collectible-casts. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/farcasterxyz/collectible-casts/main/CLAUDE.mdgit clone --depth 1 https://github.com/farcasterxyz/collectible-castsWrote 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/instructions/farcasterxyz/collectible-casts/claude-md)<a href="https://agentmods.dev/instructions/farcasterxyz/collectible-casts/claude-md"><img src="https://agentmods.dev/badge/instructions/farcasterxyz/collectible-casts/claude-md/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/instructions/farcasterxyz/collectible-casts/claude-md"><img src="https://agentmods.dev/badge/instructions/farcasterxyz/collectible-casts/claude-md.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 | $0.03579 | $0.03579 |
| Opus 5 | $0.01790 | $0.01790 |
| Sonnet 5 | $0.00716 | $0.00716 |
| Haiku 4.5 | $0.00358 | $0.00358 |
Grade A, and why
collectible-casts CLAUDE.md 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 9d 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 — 445 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project Overview
This is a Foundry-based Ethereum smart contract development project. Foundry is a Rust-based toolkit that provides a complete development environment for Solidity smart contracts.
- Foundry Documentation: https://getfoundry.sh/
Project Documentation
- SPEC.md - Complete specification for the Collectible Casts system, including architecture, goals, and detailed contract requirements
- PLAN.md - High-level implementation plan outlining development phases and testing strategy
- TASKS.md - Detailed task breakdown with specific implementation steps and test scenarios
Essential Commands
Building and Testing
forge build # Compile all contracts
forge build --sizes # Compile and show contract sizes
forge test # Run all tests
forge test -vvv # Run tests with maximum verbosity (useful for debugging)
forge test --match-test testName # Run specific test
forge test --match-contract ContractName # Run tests for specific contract
forge test --gas-report # Run tests with gas usage report
# Fuzz testing profiles
forge test # Default: 2048 fuzz runs
FOUNDRY_PROFILE=ci forge test # CI: 10,000 fuzz runs
FOUNDRY_PROFILE=deep forge test # Deep: 50,000 fuzz runs
forge test --fuzz-runs 100000 --fuzz-seed 0x123 # Custom deterministic deep fuzzing
Code Quality
forge fmt # Format all Solidity files (120 char line length)
forge fmt --check # Check formatting without modifying files
forge snapshot # Generate gas usage snapshots
forge snapshot --check # Compare gas usage against .gas-snapshot
forge coverage # Generate test coverage report (minimum 94%)
python3 script/check-coverage.py # Verify 100% coverage for production contracts
Local Development
anvil # Start local Ethereum node for testing
anvil --fork-url <RPC_URL> # Fork mainnet for testing
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.
- 9d ago First seen · 445 lines · 3,579 tokens per session scan A 99a75fdf1123
collectible-casts CLAUDE.md is an instructions file published in the GitHub repository farcasterxyz/collectible-casts (23 stars, last pushed 1y ago), licensed MIT. It adds 3,579 tokens to every session, about $0.0179 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.
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