Borrowing it
Nothing to install: this file belongs to Archstone-Romania/archstone. 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/Archstone-Romania/archstone/main/CLAUDE.mdgit clone --depth 1 https://github.com/Archstone-Romania/archstoneWrote 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/archstone-romania/archstone/claude-md)<a href="https://agentmods.dev/instructions/archstone-romania/archstone/claude-md"><img src="https://agentmods.dev/badge/instructions/archstone-romania/archstone/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/archstone-romania/archstone/claude-md"><img src="https://agentmods.dev/badge/instructions/archstone-romania/archstone/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 | $0.01385 | $0.01385 |
| Opus 5.5 | $0.00554 | $0.00554 |
| Sonnet 5.5 | $0.00277 | $0.00277 |
| Haiku 4.5 | $0.00138 | $0.00138 |
Grade A, and why
archstone 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 22d 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 — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Guidance for Claude Code and other coding agents working in this repository.
What this is
Archstone — a compiler for AI capabilities. A business describes what it can do once, in CDL (the Capability Definition Language); the compiler lowers that to a target-agnostic IR, and emitters generate what an agent needs. MCP today, other protocols as they arrive.
It is not an MCP server. It generates one, and that distinction is the product: change the protocol and you regenerate rather than rewrite.
Where development happens
This repository is the home of the core — CDL, the compiler, the IR, emitters, runtime, CLI, embedded SDK and provider adapters. Issues, pull requests, CI and releases belong here, and so does every core change — there is no other tree it has to be made in first.
Planning material — product strategy, commercial artifacts, pricing, research — lives in a private repository and always will. What reaches this one is the work and the technical argument for it, never the commercial reasoning behind choosing it.
The hosted commercial product will live in its own separate repository and depend on
@archstone/* from npm. The core must never depend on it. That direction is permanent and is
the mechanical form of the open-core commitment in
docs/adr/0005-open-core-boundary-artifact-guarantee.md.
Branches
Every change goes through a branch and a pull request, including a one-line edit. Name the branch for what the task is, with one of exactly three prefixes:
| Prefix | For |
|---|---|
feature/ |
new capability, new docs, a decision record, a refactor — anything additive or structural |
bug/ |
a defect in shipped behaviour, fixed on the normal review cadence |
hotfix/ |
a defect fixed out of cadence, because something is broken for users now |
bug/ and hotfix/ are separated by urgency, not severity: the same defect is a bug/ when it
can wait for review and a hotfix/ when it cannot.
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.
- 22d ago Changed · -7 lines · -126 tokens per session b403d2f24a0f
- 27d ago Changed · +8 lines · +125 tokens per session 453f0c1f66b7
- 1mo ago Changed · +71 tokens per session 02e19bf3ec29
- 1mo ago First seen · 106 lines · 1,315 tokens per session scan A 1d49b8db2435
archstone CLAUDE.md is an instructions file published in the GitHub repository Archstone-Romania/archstone (6 stars, last pushed 21d ago), licensed Apache-2.0. It adds 1,385 tokens to every session, about $0.0055 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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