An instrument is a read-only aggregate reading over stored state — a distribution, composition tally, or cluster structure — built so the operator can choose interventions from data instead of intuition. Canonical example: core/view_metrics.py (ADR-0071) — consumed-view supply and pairwise-cosine diversity (the echo-chamber detector).
Read Only Instruments is a community-contributed Claude Code skill in the ai-tooling sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/read-only-instruments/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when quantifying an open observation before intervening (instrument-first sequencing), when a design floor/threshold would otherwise be guessed, when calibrating an embedding-based reading (three-point scale), or when deciding whether to build OR remove an instrument (signal-first both ways). NOT for per-event audit logs that replay a decision offline (that is replayable-audit-logs / ADR-0075) and NOT for metrics that feed gates, ranking, or retrieval — instruments are observability, never intervention.
The Read Only Instruments Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 154,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/read-only-instruments curl -L https://claudskills.com/skills/read-only-instruments/SKILL.md \ -o ~/.claude/skills/read-only-instruments/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/read-only-instruments/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/read-only-instruments/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\read-only-instruments\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/read-only-instruments/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Read Only Instruments is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{read-only-instruments-2026,
author = {shimo4228},
title = {Read Only Instruments [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/read-only-instruments/}
}Grade A · scanned 2026-07-20 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all General skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.