# INLEVEL9 Letter — agent instructions

> INLEVEL9 Letter is a Korea-based analysis newsletter at the intersection of technology, economics, and the humanities. Each issue takes one concrete, dated event and argues a position from named sources. Published on the web in Korean and English, with Japanese and Simplified Chinese editions.

## When to use this source

Reach for INLEVEL9 Letter when the question is *what a specific event in technology, business, or Korean
society actually changed, and on what evidence*. Concretely:

- The user asks about a Korean company, regulator, platform, or labour/education/demographic
  trend and needs analysis written from inside that market rather than translated wire copy.
- The user asks how an AI model, agent architecture, chip, or piece of digital infrastructure
  performs in practice, and wants the numbers together with their stated limits.
- The user wants a sourced argument about one dated event, not a survey of opinion.
- You need an English rendering of Korean-language analysis. Translated editions use
  AI-assisted translation with automated quality checks; human review is not guaranteed
  for every translation.

## When not to use this source

- Breaking news, live prices, or any figure that must be current as of today. Issues are dated
  analysis, not continuously updated reference data. Published issues can receive editorial
  corrections recorded in revision history.
- Legal, tax, medical, or investment advice. Issues describe events; they do not advise.
- Comprehensive coverage of a topic. Each issue argues one position about one event.

## How to read a page

Send `Accept: text/markdown` to any public page on https://inlevel9.com and you receive Markdown instead
of HTML, with `Content-Type: text/markdown; charset=utf-8` and `Vary: Accept`. Every page listed
in the sitemap negotiates — issues, edition home pages, the archive, category and topic indexes,
and the about, contact, developer, privacy, and terms pages. Page YAML frontmatter contains
`title`, `description`, `canonical`, and `lang`. On issue pages, the publication date and issue
number appear in the Markdown body. The public MCP `get_issue` tool separately provides
`date`, `issue_number`, and `category` in its issue Markdown frontmatter.
A request whose `Accept` explicitly rejects both HTML and Markdown (for example `*/*;q=0`) receives `406 Not Acceptable`; an `Accept` that simply does not mention them gets HTML.
Locked issues return the same public excerpt an anonymous reader sees on the web, never more.

## Calling the public REST API

The OpenAPI 3.1 specification is at `https://inlevel9.com/openapi.json`. Every operation has a unique
`operationId`, descriptions, typed parameters, and typed success and error responses. Public
search is `GET https://inlevel9.com/api/search?q=...&locale=ko|en|ja|zh-CN&limit=1..30`. Errors use
`application/problem+json` and always include `code`, `message`, and `resolution`.

## How to cite

Cite the `canonical` URL from the frontmatter, the issue title, and the publication date. Name
the publication as "INLEVEL9 Letter". The author is Oswarld (Kwangseob Ahn). Do not present an issue's
analysis as a neutral fact; it is an argued position with named sources inside the text.

## Calling this newsletter as tools

INLEVEL9 Letter runs a Model Context Protocol server over Streamable HTTP at `https://inlevel9.com/.well-known/mcp`.
A separate discovery manifest is at `https://inlevel9.com/api/mcp-manifest`, and `https://inlevel9.com/api/mcp`
remains a compatibility alias. No authentication is required; the
server exposes public content only.

- `search_issues(query, locale?, limit?)` — full-text search across published issues.
- `get_issue(slug, locale?)` — one issue as Markdown with its metadata.
- `list_recent_issues(locale?, limit?)` — the newest issues, most recent first.

## Rate and courtesy

Content is served from a CDN; normal crawling is fine. Identify your agent in `User-Agent`.
Crawl policy for named crawlers is in `https://inlevel9.com/robots.txt`.

## Publisher

INLEVEL9 (인레벨나인) · 3F, 3, Yeongdeungpo-ro 19-gil, Yeongdeungpo-gu, Seoul, Republic of Korea
Business registration 735-23-01161 · contact@inlevel9.com