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sii: Instructions file for Claude Code

CLAUDE.md

sii CLAUDE.md is an instructions file for Claude Code from albertomarturelo/sii. It costs 999 tokens per session, scanned A, original, MIT.

Project instructions for a TypeScript monorepo that provides a command-line tool and MCP server for interacting with Chile's tax authority, SII.

In plain words
What is it for?
Use it when changing or reviewing the SII core, command-line interface, MCP server, or related project documentation.
Why use it?
It gives coding agents the project's architecture, technology choices, conventions, and legal and operational safeguards in one place.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: reads .claude/ paths; mentions Claude Code.

This is albertomarturelo/sii's own configuration. It tells Claude Code how to work on sii itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything sii configures →

not rated 5repo changed 2d ago A scan 999 tokens original MIT
View source ↗ albertomarturelo/sii
Reuse

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.

Copy the file
curl -O https://raw.githubusercontent.com/albertomarturelo/sii/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/albertomarturelo/sii

Made for: Claude Code.

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README.md
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Per session 999 This file is loaded in full into every session.
When invoked 999 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 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 5.1 $0.00999 $0.00999
Opus 5 $0.00500 $0.00500
Sonnet 5 $0.00200 $0.00200
Haiku 4.5 $0.00100 $0.00100

Measured 2d ago against content hash 2e815149a5fb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

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 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

CLAUDE.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 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-core config. Prod is the only target; there is no env switch (ported from sii-py ADR-016). (ADR-004)
  • Surfaces call @albertomarturelo/sii-core tasks 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 /decision:new first. (ADR-001 / CFD)
  • Corrections become conventions. Fix the same pattern twice → write it into docs/CONVENTIONS.md in 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 operate pointer 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.

Read the full file on GitHub · 87 lines

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 Changed · -4 lines · -11 tokens per session 2e815149a5fb
  2. 7d ago First seen · 91 lines · 1,010 tokens per session scan A 10dd12846c90

Subscribe to this mod's changes

sii CLAUDE.md is an instructions file published in the GitHub repository albertomarturelo/sii (5 stars, last pushed 6d ago), licensed MIT. It adds 999 tokens to every session, about $0.0050 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.

anthropicchileclaudeclimcpmodel-context-protocol
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