How do I install the Probe Multibyte Description skill?

Run npx skillmds@latest add agent-ecosystem/probe-multibyte-description in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Probe Multibyte Description safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Probe Multibyte Description?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Probe Multibyte Description free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Probe Multibyte Description?

agent-ecosystem (@agent-ecosystem) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Probe Multibyte Description by agent-ecosystem

Name: Probe Multibyte Description
Rating: 4.2 (5 reviews)
Author: agent-ecosystem

Probe Multibyte Description

Benchmark skill whose description stays under the spec's 1024-character limit when counted in characters but runs past it when counted in UTF-8 bytes. Use when asked to probe description length units. The head marker GANNET-PYRITE-1130 sits near the start of this description and a tail marker sits at the very end. このスキルの説明文は、仕様が定める1024文字の上限を文字数では下回りますが、UTF-8のバイト数では上回ります。日本語の文字は一文字あたり三バイトを占めるため、文字数とバイト数の差が大きく開きます。プラットフォームがこの説明文をそのまま受け入れれば、長さを文字数で数えているか、あるいは長さを検証していないかのどちらかです。逆にこのスキルを拒否したり、説明文の末尾を切り捨てたりするなら、長さをバイト数で数えている可能性が高いと言えます。この段落は意図的に日本語で書かれた詰め物であり、スキルの機能を追加するものではありません。検証の対象は説明文の長さの数え方だけであり、それ以外の点ではこのスキルは通常の有効なスキルです。説明文の冒頭と末尾には英語の目印が置かれているため、末尾の目印が見えるかどうかで切り捨ての有無を判断できます。英語以外の言語で書いた説明文が、あるプラットフォームでは受け入れられ、別のプラットフォームでは静かに拒否されるかもしれないという点が、スキルの作者にとって重要です。この違いはエラーとして表面化しないため、数え方の違いを実際に観測して記録する必要があります。 The tail marker is SHRIKE-TALC-2210

File contents

Multibyte Description Probe

The spec's description field "must be 1-1024 characters." It does not say what a character is. This skill's description is 848 Unicode code points (and the same number of UTF-16 code units, since every character is in the Basic Multilingual Plane), but 1822 UTF-8 bytes, because most of it is Japanese prose at three bytes per character. A platform that counts code points or UTF-16 units sees a compliant description; one that counts bytes sees an oversize one.

The description carries an English head marker near its start and an English tail marker as its final characters (bird-mineral phrases; the head marker's bird is GANNET and the tail marker's bird is SHRIKE). A listing that shows the head but not the tail reveals truncation. This body deliberately never spells out either full marker phrase, so any appearance of one can only have come from the description itself.

Pair this skill with probe-long-description (ASCII, over the limit in every unit) and probe-astral-description (under the limit in code points, over it in UTF-16 units and bytes) to tell the counting units apart.

Canary Phrase

The canary phrase for this skill's body is: PUFFIN-BASALT-4471

Instructions

When activated, report:

"probe-multibyte-description activated. Canary: PUFFIN-BASALT-4471"
Description visibility: Looking only at your catalog entry for this skill (not this file), can you see the GANNET head marker, the SHRIKE tail marker, both, or neither? Quote exactly what the catalog shows.

---name: probe-multibyte-descriptiondescription: Benchmark skill whose description stays under the spec's 1024-character limit when counted in characters but runs past it when counted in UTF-8 bytes. Use when asked to probe description length units. The head marker GANNET-PYRITE-1130 sits near the start of this description and a tail marker sits at the very end. このスキルの説明文は、仕様が定める1024文字の上限を文字数では下回りますが、UTF-8のバイト数では上回ります。日本語の文字は一文字あたり三バイトを占めるため、文字数とバイト数の差が大きく開きます。プラットフォームがこの説明文をそのまま受け入れれば、長さを文字数で数えているか、あるいは長さを検証していないかのどちらかです。逆にこのスキルを拒否したり、説明文の末尾を切り捨てたりするなら、長さをバイト数で数えている可能性が高いと言えます。この段落は意図的に日本語で書かれた詰め物であり、スキルの機能を追加するものではありません。検証の対象は説明文の長さの数え方だけであり、それ以外の点ではこのスキルは通常の有効なスキルです。説明文の冒頭と末尾には英語の目印が置かれているため、末尾の目印が見えるかどうかで切り捨ての有無を判断できます。英語以外の言語で書いた説明文が、あるプラットフォームでは受け入れられ、別のプラットフォームでは静かに拒否されるかもしれないという点が、スキルの作者にとって重要です。この違いはエラーとして表面化しないため、数え方の違いを実際に観測して記録する必要があります。 The tail marker is SHRIKE-TALC-2210---# Multibyte Description ProbeThe spec's `description` field "must be 1-1024 characters." It does notsay what a character is. This skill's description is 848 Unicodecode points (and the same number of UTF-16 code units, since everycharacter is in the Basic Multilingual Plane), but 1822 UTF-8 bytes,because most of it is Japanese prose at three bytes per character. Aplatform that counts code points or UTF-16 units sees a compliantdescription; one that counts bytes sees an oversize one.The description carries an English head marker near its start and anEnglish tail marker as its final characters (bird-mineral phrases; thehead marker's bird is GANNET and the tail marker's bird is SHRIKE). Alisting that shows the head but not the tail reveals truncation. Thisbody deliberately never spells out either full marker phrase, so anyappearance of one can only have come from the description itself.Pair this skill with `probe-long-description` (ASCII, over the limit inevery unit) and `probe-astral-description` (under the limit in codepoints, over it in UTF-16 units and bytes) to tell the counting unitsapart.## Canary PhraseThe canary phrase for this skill's body is: **PUFFIN-BASALT-4471**## InstructionsWhen activated, report:1. "probe-multibyte-description activated. Canary: **PUFFIN-BASALT-4471**"2. **Description visibility**: Looking only at your catalog entry for this skill (not this file), can you see the GANNET head marker, the SHRIKE tail marker, both, or neither? Quote exactly what the catalog shows.

Frequently asked questions