fomo-kernel CLAUDE.md

Repository instructions for maintaining a CLAUDE.md file, which gives Claude Code project-specific guidance and points to shared instructions.

In plain words
What is it for?
Deciding where repository instructions belong, keeping the Claude Code adapter short, following the project’s maintenance guide, and working with its test hooks.
Why use it?
They help keep Claude-only guidance separate from rules meant for all coding assistants, while enforcing the project’s editing and test boundaries.

Instructions file

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/atomchung/fomo-kernel/claude-md
Clone the repo
git clone --depth 1 https://github.com/atomchung/fomo-kernel
Per session 399 This file is loaded in full into every session.
When invoked 399 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.00399 $0.00399
Opus 5 $0.00199 $0.00199
Sonnet 5 $0.00080 $0.00080
Haiku 4.5 $0.00040 $0.00040

Measured 2d ago against content hash 4908633c6c56, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fomo-kernel 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 2d 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.

CLAUDE.md · 38 lines

What it actually says

CLAUDE.md — Claude Code adapter

@AGENTS.md

The line above imports the shared always-on instruction floor. AGENTS.md is the same floor Codex and other clients read natively, and it carries the route selection, the non-negotiable boundaries, and the instruction-authority policy this file is subordinate to. The detailed host-neutral contract for changing this repository — development discipline, tests, the privacy boundary, commit and PR conventions, and the mirrored-surfaces map — is docs/maintainer-guide.md. Read it before editing repository code; it is not auto-loaded, deliberately.

Edit boundary for this file

A change here must name the Claude-only mechanism it supports. Shared product, architecture, test, privacy, issue, PR, or runtime guidance belongs in the shared authority.

This file is a host adapter, so the authority policy in AGENTS.md applies to it: it may change tool mechanics only. Keep it short — tests/test_doc_language.py fails the suite if it outgrows its line budget or if a shared section heading comes back into it.

Claude Code hooks

Committed hooks in .claude/ enforce the test gate. Hook if: filters have been observed to be unreliable in the supported Claude Code setup. Every hook script must inspect tool_input.command from stdin and exit immediately for unrelated commands. Follow the self-filtering pattern in pre_commit_test_gate.sh.

That gate is the mechanical half of a shared rule and it exists only here. Since #492 it covers repository integrity (tests/test_repo_hygiene.py), not the whole registry: behaviour is gated by the blocking product-contract CI job before merge. The rule itself is stated in AGENTS.md for every client precisely because no other client enforces it.

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. 2d ago First seen · 38 lines · 399 tokens per session scan A 4908633c6c56

Subscribe to this mod's changes

fomo-kernel CLAUDE.md is an instructions file published in the GitHub repository atomchung/fomo-kernel (9 stars, last pushed 3d ago), licensed MIT. It adds 399 tokens to every session, about $0.0020 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 2026-08-31.

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