rstack-skill-evaluator: Design & UI for AI Agents | OpenAgentSkill

Overview

Benchmark and iteratively improve agent skills with Codex CLI or Claude Code by generating eval cases, comparing skill-guided vs baseline runs, grading outcomes, and recording actionable reports under skills-test/{skill-name}.

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Rstack Skill Evaluator

A repo-specific compatibility layer on top of skill-creator. Reuse its Test / Improve / Benchmark concepts, JSON schemas, grading guidance, and eval viewer, but select the executor for the current environment.

Select the executor

When the user requests Codex or codex is the available CLI, read references/codex-cli.md and follow it. Its instructions override Claude-specific commands and subagent mechanics in skill-creator.
Otherwise, follow skill-creator directly.

Do not invoke skill-creator/scripts/run_eval.py, run_loop.py, or improve_description.py in Codex mode. Those scripts shell out to claude -p and test Claude-specific skill discovery. Provider-neutral utilities such as quick_validate.py, aggregate_benchmark.py, and eval-viewer/generate_review.py can be reused after validating the installed dependency version.

Targeting a skill

If the user hasn't named a target, ask. Skills live under skills/ (production) and .agents/skills/ (internal-only).

Before editing an existing skill, snapshot it so the next iteration can compare the candidate against the previous version. Keep the snapshot and all raw run data outside tracked artifact paths.

Minimum eval rules

Use these rules for a basic eval unless the user requests a larger benchmark:

Define at least two realistic cases: one representative workflow and one boundary, failure, or constraint case. Prefer a third case when the skill has multiple distinct modes.
Give each case 2-5 outcome-focused assertions that can be verified from files, command results, or other durable evidence. Do not reward an agent merely for saying it succeeded.
Run every case as a matched pair on fresh, identical fixture copies: with_skill and without_skill. When improving an existing skill, also compare the candidate against the snapshotted previous version when that is the more useful baseline.
Keep the task prompt and runtime controls identical across configurations. The only intended difference is access to the target skill. Do not expose assertions, expected grader decisions, or another run's outputs to the executor.
Use a fresh session for every run. Pin and record the CLI version, model, sandbox, approval, network, and relevant config. Never reuse a mutated working copy.
Grade both configurations with the same checks. Prefer deterministic scripts for objective assertions; use an independent grader only for semantic checks, and require concrete evidence for every pass.
Treat CLI crashes, timeouts, missing fixtures, and auth failures as harness failures, not skill failures. Fix or clearly report the harness problem before drawing skill conclusions.
One run per configuration is a smoke eval. Use at least three repetitions before making claims about reliability, variance, token cost, or wall-time improvements.

An eval is useful when it can reveal a decision: keep the candidate, revise a general instruction or bundled resource, strengthen a weak assertion, or repair the harness. Do not fit the skill narrowly to exact fixture names or expected strings.

Artifact layout

For skill <name>, two paths are always tracked in git:

+--------------------------------------+----------------------------------+
|  Tracked path                        |  Purpose                         |
+--------------------------------------+----------------------------------+
|  skills-test/<name>/evals/evals.json |  eval definitions                |
|  skills-test/<name>/report.md        |  human-readable run summary      |
+--------------------------------------+----------------------------------+

Keep workspaces, raw run outputs, and fixtures outside version control by default, either under ignored skills-test/<name>/ paths, an OS scratch directory, or a durable artifact store. Record a stable pointer in report.md when one exists; otherwise state that the supporting artifacts are local-only or unavailable.

Do not commit fixtures or generated eval artifacts merely to accompany a report. Never commit dependency trees, build outputs, credentials, full event streams, or generated viewers.

`report.md`

Write a committed Markdown summary of the latest run. At minimum include:

setup: date, executor, CLI version, model, skill version or commit ref, run count, and relevant runtime controls;
aggregate pass rate and, when actually captured, token and wall-time results for with_skill vs its baseline;
a per-eval breakdown with failed assertions and evidence;
findings separated into skill gaps, eval gaps, and harness failures;
an iteration decision: the general change to make, the evidence supporting it, and which evals must be rerun;
pointers to raw artifacts when available, or an explicit retention limitation.

Never invent missing model, token, or timing data. Mark it as not recorded. After changing the target skill, rerun the affected cases plus at least one unaffected or held-out case, then replace report.md with the latest evidenced result and keep prior raw iterations available for comparison.

View source ↗

File metadata

name: rstack-skill-evaluator
description: Benchmark and iteratively improve agent skills with Codex CLI or Claude Code by generating eval cases, comparing skill-guided vs baseline runs, grading outcomes, and recording actionable reports under skills-test/{skill-name}.
metadata:
  dependencies: ['skill-creator']
  internal: true

View original text

---
name: rstack-skill-evaluator
description: Benchmark and iteratively improve agent skills with Codex CLI or Claude Code by generating eval cases, comparing skill-guided vs baseline runs, grading outcomes, and recording actionable reports under skills-test/{skill-name}.
metadata:
dependencies: ['skill-creator']
internal: true
---

# Rstack Skill Evaluator

A repo-specific compatibility layer on top of `skill-creator`. Reuse its Test / Improve / Benchmark concepts, JSON schemas, grading guidance, and eval viewer, but select the executor for the current environment.

## Select the executor

- When the user requests Codex or `codex` is the available CLI, read [references/codex-cli.md](references/codex-cli.md) and follow it. Its instructions override Claude-specific commands and subagent mechanics in `skill-creator`.
- Otherwise, follow `skill-creator` directly.

Do not invoke `skill-creator/scripts/run_eval.py`, `run_loop.py`, or `improve_description.py` in Codex mode. Those scripts shell out to `claude -p` and test Claude-specific skill discovery. Provider-neutral utilities such as `quick_validate.py`, `aggregate_benchmark.py`, and `eval-viewer/generate_review.py` can be reused after validating the installed dependency version.

## Targeting a skill

If the user hasn't named a target, ask. Skills live under `skills/` (production) and `.agents/skills/` (internal-only).

Before editing an existing skill, snapshot it so the next iteration can compare the candidate against the previous version. Keep the snapshot and all raw run data outside tracked artifact paths.

## Minimum eval rules

Use these rules for a basic eval unless the user requests a larger benchmark:

1. Define at least two realistic cases: one representative workflow and one boundary, failure, or constraint case. Prefer a third case when the skill has multiple distinct modes.
2. Give each case 2-5 outcome-focused assertions that can be verified from files, command results, or other durable evidence. Do not reward an agent merely for saying it succeeded.
3. Run every case as a matched pair on fresh, identical fixture copies: `with_skill` and `without_skill`. When improving an existing skill, also compare the candidate against the snapshotted previous version when that is the more useful baseline.
4. Keep the task prompt and runtime controls identical across configurations. The only intended difference is access to the target skill. Do not expose assertions, expected grader decisions, or another run's outputs to the executor.
5. Use a fresh session for every run. Pin and record the CLI version, model, sandbox, approval, network, and relevant config. Never reuse a mutated working copy.
6. Grade both configurations with the same checks. Prefer deterministic scripts for objective assertions; use an independent grader only for semantic checks, and require concrete evidence for every pass.
7. Treat CLI crashes, timeouts, missing fixtures, and auth failures as harness failures, not skill failures. Fix or clearly report the harness problem before drawing skill conclusions.
8. One run per configuration is a smoke eval. Use at least three repetitions before making claims about reliability, variance, token cost, or wall-time improvements.

## Artifact layout

For skill `<name>`, two paths are always tracked in git:

Keep workspaces, raw run outputs, and fixtures outside version control by default, either under ignored `skills-test/<name>/` paths, an OS scratch directory, or a durable artifact store. Record a stable pointer in `report.md` when one exists; otherwise state that the supporting artifacts are local-only or unavailable.

Do not commit fixtures or generated eval artifacts merely to accompany a report. Never commit dependency trees, build outputs, credentials, full event streams, or generated viewers.

## `report.md`

Write a committed Markdown summary of the latest run. At minimum include:

- setup: date, executor, CLI version, model, skill version or commit ref, run count, and relevant runtime controls;
- aggregate pass rate and, when actually captured, token and wall-time results for `with_skill` vs its baseline;
- a per-eval breakdown with failed assertions and evidence;
- findings separated into **skill gaps**, **eval gaps**, and **harness failures**;
- an iteration decision: the general change to make, the evidence supporting it, and which evals must be rerun;
- pointers to raw artifacts when available, or an explicit retention limitation.

Never invent missing model, token, or timing data. Mark it as not recorded. After changing the target skill, rerun the affected cases plus at least one unaffected or held-out case, then replace `report.md` with the latest evidenced result and keep prior raw iterations available for comparison.

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
The skill is a compatibility layer and depends on the external 'skill-creator' skill; if that dependency is missing, the instructions are incomplete.
The SKILL.md excerpt is truncated, so some sections (e.g., full report.md requirements) are not visible, but the provided content is coherent.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 93 GitHub stars
Stars/forks activity: 93 stars, 4 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.

Start with one small task

1Read the source. Confirm the input, expected output, dependencies and permissions.

Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: rstackjs/agent-skills
License: MIT
Version: 1.0.0
Last GitHub push: Sep 4, 2026
Registry updated: Sep 7, 2026
Instruction path: .agents/skills/rstack-skill-evaluator/SKILL.md @ 9032c74a72ad

Version reported in registry metadata; check source releases before relying on it.

Quality

66/100

Promising

Trust

56/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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}

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Source: rstackjs/agent-skills
Indexed by: OpenAgentSkill community index

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Show the canonical listing, current trust and audit signals, and real Agent-Proven evidence where developers evaluate the repository.

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[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/rstackjs-rstack-skill-evaluator?metric=trust&label=Trust)](https://www.openagentskill.com/skills/rstackjs-rstack-skill-evaluator?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/rstackjs-rstack-skill-evaluator?metric=audit&label=Audit)](https://www.openagentskill.com/skills/rstackjs-rstack-skill-evaluator/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/rstackjs-rstack-skill-evaluator?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/rstackjs-rstack-skill-evaluator?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

Preview badge Open audit Creator kit

Community signal

Share whether this skill looks useful for your agent workflow. Aggregated feedback improves rankings over time.