How do I install the Probe Astral Description skill?

Run npx skillmds@latest add agent-ecosystem/probe-astral-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 Astral 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 Astral 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 Astral Description free to use?

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

Who published Probe Astral Description?

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

Probe Astral Description by agent-ecosystem

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

Probe Astral Description

Benchmark skill whose description stays under the spec's 1024-character limit when counted in Unicode code points but runs past it when counted in UTF-16 code units or UTF-8 bytes. Use when asked to probe description length units. The head marker MAGPIE-OBSIDIAN-1240 sits near the start and a tail marker sits at the very end; between them is deliberate emoji padding. 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱 🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱 🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱 🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏

File contents

Astral 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 869 Unicode code points, but 1319 UTF-16 code units and 2219 UTF-8 bytes, because most of it is emoji from the supplementary planes: each one is a single code point, two UTF-16 units, and four bytes. A platform that counts code points sees a compliant description; one that counts UTF-16 units (JavaScript's .length) or bytes sees an oversize one.

The description carries an ASCII head marker near its start and an ASCII tail marker as its final characters (bird-mineral phrases; the head marker's bird is MAGPIE and the tail marker's bird is LINNET). 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-multibyte-description (under the limit in code points and UTF-16 units, over it in bytes) to tell the counting units apart.

Canary Phrase

The canary phrase for this skill's body is: ORIOLE-GRANITE-5583

Instructions

When activated, report:

"probe-astral-description activated. Canary: ORIOLE-GRANITE-5583"
Description visibility: Looking only at your catalog entry for this skill (not this file), can you see the MAGPIE head marker, the LINNET tail marker, both, or neither? Quote exactly what the catalog shows.

---name: probe-astral-descriptiondescription: Benchmark skill whose description stays under the spec's 1024-character limit when counted in Unicode code points but runs past it when counted in UTF-16 code units or UTF-8 bytes. Use when asked to probe description length units. The head marker MAGPIE-OBSIDIAN-1240 sits near the start and a tail marker sits at the very end; between them is deliberate emoji padding. 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱 🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱 🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱 🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏---# Astral Description ProbeThe spec's `description` field "must be 1-1024 characters." It does notsay what a character is. This skill's description is 869 Unicodecode points, but 1319 UTF-16 code units and 2219 UTF-8 bytes,because most of it is emoji from the supplementary planes: each one is asingle code point, two UTF-16 units, and four bytes. A platform thatcounts code points sees a compliant description; one that counts UTF-16units (JavaScript's `.length`) or bytes sees an oversize one.The description carries an ASCII head marker near its start and anASCII tail marker as its final characters (bird-mineral phrases; thehead marker's bird is MAGPIE and the tail marker's bird is LINNET). 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-multibyte-description` (under the limit in codepoints and UTF-16 units, over it in bytes) to tell the counting unitsapart.## Canary PhraseThe canary phrase for this skill's body is: **ORIOLE-GRANITE-5583**## InstructionsWhen activated, report:1. "probe-astral-description activated. Canary: **ORIOLE-GRANITE-5583**"2. **Description visibility**: Looking only at your catalog entry for this skill (not this file), can you see the MAGPIE head marker, the LINNET tail marker, both, or neither? Quote exactly what the catalog shows.

Frequently asked questions