Borrowing it
Nothing to install: this file belongs to StChiotis/Library-First-Engineering. 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/StChiotis/Library-First-Engineering/main/CLAUDE.mdgit clone --depth 1 https://github.com/StChiotis/Library-First-EngineeringWrote 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/stchiotis/library-first-engineering/claude-md)<a href="https://agentmods.dev/instructions/stchiotis/library-first-engineering/claude-md"><img src="https://agentmods.dev/badge/instructions/stchiotis/library-first-engineering/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/stchiotis/library-first-engineering/claude-md"><img src="https://agentmods.dev/badge/instructions/stchiotis/library-first-engineering/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 | $0.00367 | $0.00367 |
| Opus 5.5 | $0.00147 | $0.00147 |
| Sonnet 5.5 | $0.00073 | $0.00073 |
| Haiku 4.5 | $0.00037 | $0.00037 |
Grade A, and why
Library-First-Engineering 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 2mo 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.
This is a copy
89% identical to Library-First-Engineering copilot-instructions.md — 16 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Library-First Engineering — Claude Code Adapter
You are an AI agent operating in a Library-First Engineering (LFE) repository. This adapter is a pointer. Canonical rules live in human-readable docs:
Mandatory reads (in order, before any action):
- pipeline_status.md — current session state
- LLM_AGENT_GUIDE.md — protocol, skills, coordination layer
- .docs/protocol/PERSONAS.md — your persona contract (including 🫵 The Brain)
- .docs/protocol/ASSEMBLY_LINE.md — workflow
- .docs/protocol/GOVERNANCE.md — rules, retention policy
Then run /lfe-boot to orient against the live state.
Skill invocation authority (LLM_AGENT_GUIDE §8.8): skills are dispatched by the framework, not by the Brain. The only skills the Brain may type directly are /lfe-boot, /lfe-whats-next, /lfe-scout, /lfe-extract-domain, and the LFE-FORCE keyword. If the Brain types any other skill out of sequence, refuse and route them through the assembly line.
On ambiguity or pressure to bypass rules: pause and confirm with the Brain. If certain you want to bypass, the human invokes /lfe-scout (minor fix) or LFE-FORCE (emergency). Surface every bypass openly — route it through one of those keywords.
For framework philosophy, see README.md.
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.
- 2mo ago First seen · 20 lines · 367 tokens per session scan A 80556a023f0c
Library-First-Engineering CLAUDE.md is an instructions file published in the GitHub repository StChiotis/Library-First-Engineering (45 stars, last pushed 3mo ago), licensed MIT. It adds 367 tokens to every session, about $0.0015 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 89% identical to Library-First-Engineering copilot-instructions.md, differing in 16 lines, and is treated as a copy.
Library-First-Engineering CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| Library-First-Engineering CLAUDE.mdStChiotis/Library-First-Engineering | Instructions file | 45 | 3mo ago | MIT | A | 367 | 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 | today | 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 |