Borrowing it
Nothing to install: this file belongs to evmts/tevm. 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/evmts/tevm/main/CLAUDE.mdgit clone --depth 1 https://github.com/evmts/tevmWrote 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/evmts/tevm/claude-md)<a href="https://agentmods.dev/instructions/evmts/tevm/claude-md"><img src="https://agentmods.dev/badge/instructions/evmts/tevm/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/evmts/tevm/claude-md"><img src="https://agentmods.dev/badge/instructions/evmts/tevm/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 | $0.00686 | $0.00686 |
| Opus 5.5 | $0.00274 | $0.00274 |
| Sonnet 5.5 | $0.00137 | $0.00137 |
| Haiku 4.5 | $0.00069 | $0.00069 |
Grade A, and why
tevm 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 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 — 32 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TEVM implementation context
Read AGENTS.md for the enforceable repository contract and CONTRIBUTING.md for toolchain and factory commands.
Native architecture
TEVM embeds ZEVM's Zig NodeRuntime through its C ABI and a Node-API addon. The maintained native sources are the sibling repositories ../zevm, ../voltaire, and ../guillotine-mini. Voltaire supplies primitives, cryptography and state; Guillotine Mini executes bytecode. ZEVM owns the node, transaction admission, mining, chain, fork backend and JSON-RPC dispatcher.
packages/node serializes calls into a native handle and exposes request, raw rpc, ready, close, and a Node event emitter. It does not implement Ethereum state or transaction execution. Block events include native interval mining. Each engine owns independent state; callers must close handles.
packages/memory-client builds a viem client and transport over the engine. Its convenience helpers only convert ABI values and request native RPC methods. packages/server delivers native RPC over HTTP, WebSocket and IPC. Connection-scoped subscriptions use native filters.
The old JavaScript VM, state-manager, transaction, trie, txpool, receipt, procedure and decorator packages have been retired. Do not recreate these abstractions, install a registry fallback engine, or restore EthereumJS. ZEVM's bindings contain JavaScript and C, not TypeScript wrappers.
Browsers connect to a native node through JSON-RPC. A browser execution adapter is not implemented. Solidity compiler plugins, ABI contracts and TypeScript tooling remain host-side features.
Working on behavior
For execution, state, mining or RPC semantics, change the native implementation in the appropriate sibling repository. For host lifecycle, transport delivery or ABI convenience methods, change TEVM. Keep exact JSON-RPC quantity/data/null/error encoding covered by real native integration tests.
Native RPC calls are synchronous. Tests that fork an HTTP upstream must run that service in another process, so the same JavaScript event loop is not blocked while serving its own request. Keep a deterministic local fixture; do not rely on private RPC endpoints.
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 Changed · -446 lines · -4,665 tokens per session 30e567d1a02c
- 1mo ago First seen · 478 lines · 5,351 tokens per session scan A 85600904b668
tevm CLAUDE.md is an instructions file published in the GitHub repository evmts/tevm (449 stars, last pushed 1mo ago), licensed MIT. It adds 686 tokens to every session, about $0.0027 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 2026-08-31.
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