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K2 Study Decks & Algorithm

com.k2kanji/studyk2kanji.comstreamable-httpv1.1.0Scanned

Study decks for 8 languages plus the K2 spaced-repetition engine, runnable on your items.

7 tools: 1 change things and 6 only read.

Tools: 0 delete, 0 irreversible, 1 write, 6 read.
  • Reads private data · 0
  • Reads text others write · 0
  • Can send data out · 0
  • 1 finding

Anlyon alternative

1 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

7 tools

Changes things 1Claude Code: ask
  • simulate_k2_sessionRun the real K2 engine over your own items.1 finding

    Why it is in this group

    • The description's first verb is "run": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "simulate_k2_session" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true}; The description's first verb is "run": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Run the real K2 engine over your own items. Give it a list of terms (any strings — your flashcards, cube cases, anything), a study mode, and a sequence of answers, and it returns the p-value trajectory per answer, which items are now mastered, when the pool expanded, and the probability distribution over what K2 would serve next. Use this to drive your own drilling with K2 as the scheduler instead of reimplementing it.

    Annotations the server declares

    • readOnlyHint: true
Only reads 6Show 6 read-only tools
  • explain_k2_algorithmThe K2 spaced-repetition engine, described.No findings

    Why it is in this group

    • The name "explain_k2_algorithm" says "explain": a word for reading.
    Description, as the server wrote it
    The K2 spaced-repetition engine, described. K2 stores no review dates: each item holds a probability p that halves on a correct answer and doubles on a wrong one, and items are drawn by Monte Carlo rejection sampling, so the pool self-organizes around current weaknesses and expands when it cools. Returns the update rule (including the deliberate hinted-answer exception), the selection and pool-expansion mechanics, the live tuning constants, and notes for porting it. Read this before simulate_k2_session.

    Annotations the server declares

    • readOnlyHint: true
  • get_cube_algorithmsRubik's cube last-layer algorithm sets used by the K2 cube trainer: full OLL (57 cases), full PLL (21), the two-look beginner subsets, and full ZBLL.No findings

    Why it is in this group

    • The name "get_cube_algorithms" says "get": a word for reading.
    Description, as the server wrote it
    Rubik's cube last-layer algorithm sets used by the K2 cube trainer: full OLL (57 cases), full PLL (21), the two-look beginner subsets, and full ZBLL. Each case returns its primary algorithm plus alternates, with sources and finger-trick notes where recorded. Every algorithm in these sets is verified against a cube simulator by the repo's audit script (app/cube/scripts/audit-algorithms.mjs), run before data changes land. Filter by `case_id` or `group`; omit both for the set's structure and levels.

    Annotations the server declares

    • readOnlyHint: true
  • get_entryOne deck entry in full, matched on the exact term (the kanji, hanzi, jamo, or word itself).No findings

    Why it is in this group

    • The name "get_entry" says "get": a word for reading.
    Description, as the server wrote it
    One deck entry in full, matched on the exact term (the kanji, hanzi, jamo, or word itself). Case-insensitive. Returns every field the deck carries, including the deck-specific extras: stroke counts and JLPT level for kanji, component kanji for compounds, declension and English derivatives for Latin, IPA and pronunciation audio for French.

    Annotations the server declares

    • readOnlyHint: true
  • get_site_infoWhat K2 is, which apps it runs, what this server does and does not expose, and every machine-readable surface.No findings

    Why it is in this group

    • The name "get_site_info" says "get": a word for reading.
    Description, as the server wrote it
    What K2 is, which apps it runs, what this server does and does not expose, and every machine-readable surface. Also returns the full capability map — every tool, prompt, and resource — so a client with a stale or tools-only roster can still see the whole surface.

    Annotations the server declares

    • readOnlyHint: true
  • list_decksThe catalog of K2 study decks: eight curated datasets spanning Japanese kanji and vocabulary, HSK Chinese, Korean Hangul, Spanish, French, classical Latin and medical Latin.No findings

    Why it is in this group

    • The name "list_decks" says "list": a word for reading.
    Description, as the server wrote it
    The catalog of K2 study decks: eight curated datasets spanning Japanese kanji and vocabulary, HSK Chinese, Korean Hangul, Spanish, French, classical Latin and medical Latin. Returns each deck id (the value other tools take), what it teaches, how many entries it has, and what its fields mean. Call this before search_deck.

    Annotations the server declares

    • readOnlyHint: true
  • search_deckSearch one deck.No findings

    Why it is in this group

    • The name "search_deck" says "search": a word for reading.
    Description, as the server wrote it
    Search one deck. `query` substring-matches the term, its reading/pronunciation, its English meanings, and its category, so "bone" finds entries glossed as bone and "ㄱ" finds that jamo. Narrow with `category` (exact, from list_decks) or `difficulty` (1-5; for the kanji deck this is the school grade). Paginated via `offset`.

    Annotations the server declares

    • readOnlyHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnsimulate_k2_session

    The server marks "simulate_k2_session" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true}; The description's first verb is "run": a word for a change.

    What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http study https://k2kanji.com/api/mcp
claude mcp add --transport http study https://k2kanji.com/api/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__study__list_decks",
      "mcp__study__search_deck",
      "mcp__study__get_entry",
      "mcp__study__get_cube_algorithms",
      "mcp__study__explain_k2_algorithm",
      "mcp__study__get_site_info"
    ],
    "ask": [
      "mcp__study__simulate_k2_session"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as study. Review it before you use it.

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/com.k2kanji/study/verify?hash=95b09ca3f8ec4711f2f1c0c2fe6ad4746741b6156c07571894b20532f84ceef5" | jq -e '.changed == false'

Pinned hash 95b09ca3f8ec, from Oct 23, 2026, 12:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.k2kanji/study/changes.xml

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Source: MCP Registry. Synced Oct 23, 2026, 12:17 UTC.