Borrowing it
Nothing to install: this file belongs to safe-agentic-world/nomos. 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/safe-agentic-world/nomos/main/CLAUDE.mdgit clone --depth 1 https://github.com/safe-agentic-world/nomosWrote 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/safe-agentic-world/nomos/claude-md)<a href="https://agentmods.dev/instructions/safe-agentic-world/nomos/claude-md"><img src="https://agentmods.dev/badge/instructions/safe-agentic-world/nomos/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/safe-agentic-world/nomos/claude-md"><img src="https://agentmods.dev/badge/instructions/safe-agentic-world/nomos/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 | $0.02252 | $0.02252 |
| Opus 5.5 | $0.00901 | $0.00901 |
| Sonnet 5.5 | $0.00450 | $0.00450 |
| Haiku 4.5 | $0.00225 | $0.00225 |
Grade A, and why
nomos 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 — 94 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.
Commands
Go 1.25+. Use Makefile targets or go directly.
- Build CLI:
go build ./cmd/nomos(ormake build) - Release build with version metadata:
make release-build(sets ldflags intointernal/version) - Full test suite:
go test ./... - Race suite (release gate):
go test -race ./... - Static checks:
go vet ./...(aliased asmake lint) - Format:
gofmt -w .(aliased asmake fmt) - Single package:
go test ./internal/policy - Single test:
go test ./internal/policy -run TestName - Focused MCP compat:
go test ./internal/mcp - Fast iteration set:
go test ./cmd/nomos ./internal/policy ./internal/service ./internal/gateway ./internal/mcp ./internal/agenthook - Hook adapters:
go test ./internal/agenthook ./cmd/nomos - Corpus golden:
go test ./internal/agenthook -run Corpus; after an intended decision change, regenerate with-update-corpusand review the diff oftestdata/realworld/expected.json - Profile hashes:
go run scripts/pin_profile_hashes.go(ormake pin-profile-hashes) after editingprofiles/*.yaml - Docs links:
python3 scripts/check_docs.py
Smoke checks using the built binary (run after make build / go build):
nomos doctor -c ./examples/quickstart/config.quickstart.json --format jsonnomos policy test --action ./examples/quickstart/actions/allow-readme.json --bundle ./examples/policies/safe.yamlnomos policy test --action ./examples/quickstart/actions/deny-env.json --bundle ./examples/policies/safe.yamlnomos policy explain ...for deny/approval diagnostics
CLI flag precedence is flag > env > fail. Relevant env vars: NOMOS_CONFIG, NOMOS_POLICY_BUNDLE, NOMOS_LOG_LEVEL. --config/-c and --policy-bundle/-p are resolved to absolute paths at parse time.
Architecture
Nomos is an execution firewall for AI agents: an agent-agnostic control plane that sits at the execution boundary and returns ALLOW / DENY / REQUIRE_APPROVAL on normalized actions. The same pipeline backs both the MCP server and HTTP gateway surfaces — understanding that pipeline is the big picture.
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 · +13 lines · +547 tokens per session 135bfaaf5649
- 1mo ago First seen · 81 lines · 1,705 tokens per session scan A 9e7c0a233a4b
nomos CLAUDE.md is an instructions file published in the GitHub repository safe-agentic-world/nomos (19 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 2,252 tokens to every session, about $0.0090 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 2026-08-30.
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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
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Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.