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Agent skill

Reviewing Samplers

by iopsystems in iopsystems/rezolus

A skill your agent uses when reviewing a Rezolus sampler change before merge — a new sampler, a change to an existing sampler's probes/refresh/metrics, or core changes that affect samplers; or…

Custom licenceAuto-check passed

Install Reviewing Samplers

skills CLI
$ npx skills add iopsystems/rezolus --skill reviewing-samplers -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install iopsystems/rezolus reviewing-samplers --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/iopsystems/rezolus.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/reviewing-samplers .claude/skills/reviewing-samplers && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
reviewing-samplers
GitHub stars
275
Token cost
~1.6k tokens
SKILL.md length
797 words
Files
1
Skills in repo
11
Repo updated
First seen
Licence
Custom licence

At a glance

A skill your agent uses when reviewing a Rezolus sampler change before merge — a new sampler, a change to an existing sampler's probes/refresh/metrics, or core changes that affect samplers; or…

  • Works in 8 steps: Run the operational checklist in… → Measure the overhead (Principle 16) —… → Cadence (Principle 17). Does refresh()… → …
  • Reviewing a Rezolus sampler change before merge — a new sampler
  • SKILL.md covers Overview, When to use, The review and Measurement recipe, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Reviewing Samplers is an agent skill from iopsystems/rezolus. Use when reviewing a Rezolus sampler change before merge — a new sampler, a change to an existing sampler's probes/refresh/metrics, or core changes that affect samplers; or whenever a sampler's overhead, cadence, or data source is in question.

Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: High-resolution, low-overhead systems and service telemetry.

When your agent uses it

  • Reviewing a Rezolus sampler change before merge — a new sampler
  • A change to an existing samplers probes/refresh/metrics
  • Core changes that affect samplers
  • Whenever a samplers overhead

Example prompts

  • “/reviewing-samplers”

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

  1. Run the operational checklist in docs/principles.md ("Reviewing or writing a sampler — operational checklist") literally — one yes/no or…
  2. Measure the overhead (Principle 16) — the load-bearing step. Produce the per-refresh µs number on real hardware at fleet-representative…
  3. Cadence (Principle 17). Does refresh() read a non-mmap, cost-bearing source (sysfs device command, ioctl, SMI/library call, page-table…
  4. Data-source justification (Principle 15). A per-refresh sysfs/procfs parse must be a genuine exception (no BPF/perf hook) and commented as…
  5. Robust to absence. No device / no permission → the sampler emits zero series and never errors the agent. Linux-only samplers compile a…
  6. Displayed ("you record it, you display it"). Every new metric has a viewer card: a section or card in crates/dashboard/src/dashboard/…
  7. Series context (principles checklist). REQUIRED section in the report, one line per metric family, each with three parts
  8. Verdict. GO / NO-GO stated with the measured numbers and the specific failing checklist items — never adjectives. The number lands in the…

What it can do on your machine

Read from SKILL.md and the folder at commit f8c4e3d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are toml and bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Reviewing Samplers loads about 1.6k tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 797 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~66
When it runs · the whole SKILL.md, loaded when a task matches
~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 797 words (~1,552 tokens).

“Measure, don't assert. A sampler's overhead is a number you produce on real hardware — not an adjective you reason to. docs/principles.md is the spec (15 principles + an operational checklist); this skill is the pass that runs it, with…”

— opening of SKILL.md by iopsystems, Custom licence
name
reviewing-samplers

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/reviewing-samplers of iopsystems/rezolus.

Open the folder on GitHubat commit f8c4e3d

Compare with similar skills

Reviewing Samplers next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Reviewing Samplers compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Reviewing Samplers this skilliopsystems/rezolus275—~1.6kAutomated safety check: PassCustom licence
Mergeremotion-dev/remotion63k—~508Automated safety check: PassCustom licence
Mergewithastro/astro63k—~153Automated safety check: PassCustom licence
Merge Upsymfony/symfony31k—~4kAutomated safety check: PassMIT
Mergealirezarezvani/claude-skills28k—~587Automated safety check: PassMIT
Merging PRsPostHog/posthog40k—~4.1kAutomated safety check: PassCustom licence

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  • Release

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Questions about Reviewing Samplers

What does Reviewing Samplers do?

A skill your agent uses when reviewing a Rezolus sampler change before merge — a new sampler, a change to an existing sampler's probes/refresh/metrics, or core changes that affect samplers; or…. Reviewing Samplers is an agent skill from iopsystems/rezolus. Use when reviewing a Rezolus sampler change before merge — a new sampler, a change to an existing sampler's probes/refresh/metrics, or core changes that affect samplers; or whenever a sampler's overhead, cadence, or data source is in question.

When should I use Reviewing Samplers?

Reviewing Samplers fits situations like: reviewing a Rezolus sampler change before merge — a new sampler; A change to an existing samplers probes/refresh/metrics; core changes that affect samplers; whenever a samplers overhead.

How do I install Reviewing Samplers in Claude Code?

Run `npx skills add iopsystems/rezolus --skill reviewing-samplers -a claude-code`. Or copy the skill folder (.claude/skills/reviewing-samplers in iopsystems/rezolus) into .claude/skills/reviewing-samplers in your project. Claude Code loads it when a task matches its description.

How do I install Reviewing Samplers in Codex?

Run `npx skills add iopsystems/rezolus --skill reviewing-samplers -a codex`. Or copy the skill folder (.claude/skills/reviewing-samplers in iopsystems/rezolus) into .agents/skills/reviewing-samplers in your project. Codex loads it when a task matches its description.

Can I use Reviewing Samplers in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add iopsystems/rezolus --skill reviewing-samplers -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/reviewing-samplers, .gemini/skills/reviewing-samplers, .github/skills/reviewing-samplers and .opencode/skills/reviewing-samplers in your project.

What does Reviewing Samplers need to run?

SKILL.md names no scripts, command-line tools or credentials: Reviewing Samplers is instructions for the agent only.

Does Reviewing Samplers access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Reviewing Samplers safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Reviewing Samplers use?

Reviewing Samplers has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Reviewing Samplers use?

About 1.6k tokens (SKILL.md is roughly 6.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Reviewing Samplers?

Skills that share tags, products or a category with Reviewing Samplers: Merge (remotion-dev/remotion, 63k stars), Merge (withastro/astro, 63k stars), Merge Up (symfony/symfony, 31k stars) and Merge (alirezarezvani/claude-skills, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Reviewing Samplers?

iopsystems (a GitHub organization) maintains it in iopsystems/rezolus, which has 275 GitHub stars. The repository holds 11 skills in this directory. The repository was last updated on October 10, 2026.

Source: iopsystems/rezolus on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.