probe-astral-description SKILL.md skillA
probe-astral-description from agent-ecosystem/agent-skill-implementation is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add agent-ecosystem/agent-skill-implementation/probe-astral-description@git:20260920.afab326Pins git:20260920.afab326 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- agent-ecosystem/agent-skill-implementation
- Path
benchmark-skills/probe-astral-description/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260920.afab326, committed Sep 20, 2026
- Size
- 3,836 bytes
- Repository stars
- 6
- License
- CC-BY-4.0
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. 🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱🔎🧮📚🪶🧵🪵🔬🧩🗺🪙🐦🪨🧪📏🔤🧭🌐📐📦🧱…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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 …
Read the whole file at its exact version.
How to install
mdr add agent-ecosystem/agent-skill-implementation/probe-astral-description@sha256:e3e0f20edbf052c3The line at the top of this page pins the label git:20260920.afab326, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ozkyfiaeiuo76mgo)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 20, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3836 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
agent-ecosystem/agent-skill-implementation · 6 stars · license CC-BY-4.0 · pushed 2026-09-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ozkyfiaeiuo76mgo GET https://markdownregistry.com/api/v1/resolve?ref=agent-ecosystem/agent-skill-implementation/probe-astral-description GET https://markdownregistry.com/api/v1/blob/e3e0f20edbf052c326b6dc08b4abc09a9fb89916c64b08c6701d04793d6cb277
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.