What is fe2o3 CLAUDE.md?

Project instructions for fe₂o₃, a Rust terminal-software suite whose applications are kept in separate repositories and share libraries.

Use them when navigating the suite, choosing the correct application or shared library, and following its development rules.

They explain the repository layout and identify archived components that should not be changed.

How isene/fe2o3 configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to isene/fe2o3. 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/isene/fe2o3/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/isene/fe2o3

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/isene/fe2o3/claude-md/github.svg)](https://agentmods.dev/instructions/isene/fe2o3/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/isene/fe2o3/claude-md"><img src="https://agentmods.dev/badge/instructions/isene/fe2o3/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/isene/fe2o3/claude-md"><img src="https://agentmods.dev/badge/instructions/isene/fe2o3/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 4,672 This file is loaded in full into every session.

When invoked 4,672 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.04672	$0.04672
Opus 5.5	$0.01869	$0.01869
Sonnet 5.5	$0.00934	$0.00934
Haiku 4.5	$0.00467	$0.00467

Measured 3d ago against content hash b3877ac6994f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fe2o3 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 3d 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 · 245 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

3d ago Changed · +1 lines · +44 tokens per session b3877ac6994f
4d ago Changed · +2 tokens per session 337d0e1d22c7
5d ago Changed · +2 lines · +85 tokens per session 2b90c4705622
6d ago Changed · +1 lines · +40 tokens per session e3f71959e17b
10d ago Changed · +8 lines · +194 tokens per session 13472ac3341a
12d ago Changed · -1 tokens per session 332c6c64571c
27d ago Changed · +35 tokens per session c9f835dbe6a0
28d ago Changed e8e6138a0e32
1mo ago Changed · +9 lines · +146 tokens per session 0012c6b71742
1mo ago First seen · 224 lines · 4,127 tokens per session scan A 8be44dca6952

Subscribe to this mod's changes

fe2o3 CLAUDE.md is an instructions file published in the GitHub repository isene/fe2o3 (46 stars, last pushed 3d ago), with no licence file. It adds 4,672 tokens to every session, about $0.0187 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.

Languages Rust

fe2o3 CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fe2o3 CLAUDE.mdisene/fe2o3	Instructions file	46	3d ago	none	A	4,672	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

fe2o3: Instructions file for Claude Code