Borrowing it
Nothing to install: this file belongs to albertomarturelo/sii. 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/albertomarturelo/sii/main/CLAUDE.mdgit clone --depth 1 https://github.com/albertomarturelo/siiWrote 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/albertomarturelo/sii/claude-md)<a href="https://agentmods.dev/instructions/albertomarturelo/sii/claude-md"><img src="https://agentmods.dev/badge/instructions/albertomarturelo/sii/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/albertomarturelo/sii/claude-md"><img src="https://agentmods.dev/badge/instructions/albertomarturelo/sii/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 | $0.01014 | $0.01014 |
| Opus 5.5 | $0.00406 | $0.00406 |
| Sonnet 5.5 | $0.00203 | $0.00203 |
| Haiku 4.5 | $0.00101 | $0.00101 |
Grade A, and why
sii 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 yesterday.
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.
Copies of this mod
1 near-identical copy found in the catalogue:
- sii CLAUDE.md — 97% identical, 19 lines differ
How it starts
The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Project: sii — TypeScript core + CLI + MCP for SII Chile
What This Project Does
A TypeScript monorepo that automates routine interactions with Chile's tax
authority (SII — Servicio de Impuestos Internos) for a single user acting on
their own RUT, plus the empresas that user is authorized to represent. One
shared domain core (@albertomarturelo/sii-core) backs two surfaces: a human CLI and an
MCP server. The MCP server (stdio) is the integration point for both
Claude Code and Claude Desktop; the CLI serves the terminal and is also
what Claude Code can drive via Bash. The core holds every legal and operational
guardrail, so those rails apply regardless of which surface is in front.
This is a ground-up TypeScript rewrite of the proven Python sii-cli; the
hard-won SII wire knowledge and guardrails are PORTED, the code is not.
Architecture
@docs/ARCHITECTURE.md
Tech Stack
@docs/STACK.md
Conventions
@docs/CONVENTIONS.md
Roadmap
@docs/ROADMAP.md
Key Decisions
@docs/decisions/_index.md
Build & Run
- Install:
pnpm install - Build all packages:
pnpm build(tsc -b) - Typecheck:
pnpm typecheck - Test:
pnpm test(vitest) - Lint / format:
pnpm lint/pnpm format - One package:
pnpm --filter @albertomarturelo/sii-core <script>
Critical Rules
- Never hard-code a SII hostname. Read from
@albertomarturelo/sii-coreconfig. Prod is the only target; there is no env switch (ported from sii-py ADR-016). (ADR-004) - Surfaces call
@albertomarturelo/sii-coretasks only. The CLI and MCP NEVER reach past the task layer into the portal/DTE facades — that bypasses throttling, the audit log, and credential handling. (ADR-003) - External dependencies go through injectable seams. The SII portal driver, secret store, session store, audit sink, and clock are interfaces with Node default implementations, so unit tests substitute fakes and never touch the real SII / keyring / clock. The core is a Node library otherwise. (ADR-003)
- Secrets never touch disk in plaintext and never reach the LLM. The Clave
Tributaria is typed by the user into SII's real page (browser login,
cookies-only) or held in the OS keyring (CLI only). No password ever crosses
an MCP tool argument. Never commit
*.pfx,*.p12,.env, or anything under.sii/. (ADR-006) - No third-party SII libraries. Every selector, endpoint, and payload shape is derived from first-hand observation of the live SII surface and cited in a code comment. (ADR-004)
- Decisions get an ADR BEFORE implementation. About to add a dependency,
move a layer boundary, or pick between plausible patterns? Run
/new-decisionfirst. (ADR-001 / CFD) - Corrections become conventions. Fix the same pattern twice → write it into
docs/CONVENTIONS.mdin the same commit. - Identity is single-account + operate-centric. One live session at a time
(switch by logout→login); within it, a persona account's
operatepointer selects which RUT it acts as (self by default; an empresa it represents). Empresa accounts cannot represent anyone. (ADR-005) - Absolute rule — no AI attribution anywhere. Claude, GPT, Copilot, or any AI tool must NEVER appear as co-author, generator, or reference in commits, PR titles/bodies/comments, issues, branch names, code comments, docs, or any artifact that lands in git or on GitHub. Authorship is the human owner.
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.
- yesterday Changed · +1 lines · +15 tokens per session 790fe354a9a0
- 1mo ago Changed · -4 lines · -11 tokens per session 2e815149a5fb
- 1mo ago First seen · 91 lines · 1,010 tokens per session scan A 10dd12846c90
sii CLAUDE.md is an instructions file published in the GitHub repository albertomarturelo/sii (16 stars, last pushed yesterday), licensed MIT. It adds 1,014 tokens to every session, about $0.0041 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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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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AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
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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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AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.