unknown-field

A skill whose configuration includes a field not recognized by the standard format. Its text does not explain a specific task.

In plain words
What is it for?
It is for testing skill validation when the frontmatter contains an unknown field.
Why use it?
It helps check how the system handles skills with extra configuration fields.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/rokoss21/iosm-cli/unknown-field
Any agent
npx skills add rokoss21/iosm-cli --skill unknown-field
Clone the repo
git clone --depth 1 https://github.com/rokoss21/iosm-cli

Made for: Claude Code, Codex.

Per session 12 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 42 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00012 $0.00042
Opus 5 $0.00006 $0.00021
Sonnet 5 $0.00002 $0.00008
Haiku 4.5 $0.00001 $0.00004

Measured yesterday against content hash df6e1ecfff7a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

unknown-field scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to unknown-field — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

test/fixtures/skills/unknown-field/SKILL.md · 11 lines

What it actually says

Unknown Field

This skill has non-standard frontmatter fields.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 11 lines · 12 tokens per session scan A df6e1ecfff7a

Subscribe to this mod's changes

unknown-field is a skill published in the GitHub repository rokoss21/iosm-cli (146 stars, last pushed 4mo ago), licensed MIT. It adds 12 tokens to every session and 42 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to unknown-field, differing in 0 lines, and is treated as a copy.

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