lythoskill-arena SKILL.md skillA
lythoskill-arena from lythos-labs/lythoskill is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add lythos-labs/lythoskill/lythoskill-arena@git:20261019.d2225a9Pins git:20261019.d2225a9 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lythos-labs/lythoskill
- Path
packages/lythoskill-arena/skill/SKILL.md- Versions recorded
- 7
- Latest version
- git:20261019.d2225a9, committed Oct 19, 2026
- First version recorded
- May 17, 2026
- Size
- 16,457 bytes
- Repository stars
- 3
- License
- MIT
Test play for skills and deck configurations. DEFAULT: agent reads config, spawns parallel subagents via native Agent tool, judges outputs. Single-deck test AND multi-deck A/B comparison both run agent-orchestrated (no CLI). Cross-player comparison (kimi vs codex) is the ONLY case that needs the CLI runner. Always restores parent deck. No install, no working-set pollution, no deck overwrite. Subagent-friendly: resumes interrupted runs from saved state. CRITICAL: experiments run in `/tmp`…
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
# Skill Arena
> Test play for skills and deck configurations. Not "which is best" — "which is best for what."
> **Invocation.** `arena <cmd>` below is shorthand for
> `bunx @lythos/skill-arena@{{PACKAGE_VERSION}} <cmd>` (no install), or
> `lythoskill-arena <cmd>` if installed globally. The bare `arena` name is NOT
> a registered bin — it is an in-repo alias convention in the lythoskill
> monorepo. `deck <cmd>` likewise → `bunx @lythos/skill-deck@{{PACKAGE_VERSION}} <cmd>`.
> Want the shorthand? `alias arena='bunx @lythos/skill-arena@latest'` — optional.
## Decision Tree (READ FIRST)
```
User says: "test/compare/arena/benchmark/A vs B"
│
├── Cross-PLAYER? (kimi vs codex vs claude)
│ OR user explicitly says useAgent/specific player
│ OR platform doesn't support Agent tool subagents
│ → CLI runner REQUIRED (useAgent → Bun.spawn)
│ → bunx @lythos/skill-arena vs --config arena.toml
│ → Each side spawns its player CLI process
│
└── Same player, different DECKS? (DEFAULT)
→ Agent-orchestrated — NO CLI
→ YOU spawn subagents via Agent tool
→ CLI prepare-workdir + CLI archive + parallel dispatch
…Read the whole file at its exact version.
How to install
mdr add lythos-labs/lythoskill/lythoskill-arena@sha256:102038178ada39f8The line at the top of this page pins the label git:20261019.d2225a9, 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_bsrkjqcbstncnoup)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 7 versions of this file, between May 17, 2026 and Oct 19, 2026, about one every 26 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261019.d2225a9 latest | 2026-10-19 | d2225a9 | 16,457 B | A | view · diff |
| git:20261019.e94b298 | 2026-10-19 | e94b298 | 16,373 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-09-10 | 2a6d4e5 | 16,000 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-05-28 | 7f02285 | 14,473 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-05-28 | 9287680 | 14,488 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-05-18 | 8387ca0 | 14,406 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-05-17 | 50e5071 | 14,275 B | A | view |
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 (16457 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
lythos-labs/lythoskill · 3 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_bsrkjqcbstncnoup GET https://markdownregistry.com/api/v1/resolve?ref=lythos-labs/lythoskill/lythoskill-arena GET https://markdownregistry.com/api/v1/blob/102038178ada39f8e518883539607ac730b98844baba5d7c040444401f1c0dd7
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.
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