oxy-evals

oxy-evals is a skill for Claude Code, Codex from oxy-hq/oxygen. It costs 193 tokens per session (4,758 once invoked), scanned A, original, Apache-2.0.

A skill for writing, running, and diagnosing evaluation tests for Oxy agents. Each test gives an agent a prompt and checks its answer against an expected answer using an AI judge.

In plain words
What is it for?
Use it to create `.test.yml` cases, run them against `.agentic.yml` agents, inspect failures, and repair the agent or report a flawed test.
Why use it?
It helps reveal incorrect agent responses and guides repairs without weakening tests to hide failures.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: positional $N argument.

Good fit Use it to create .test.yml cases, run them against .agentic.yml agents, inspect failures, and repair the agent or report a flawed test.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/oxy-hq/oxygen/oxy-evals
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.

Any agent
npx skills add oxy-hq/oxygen --skill oxy-evals
Clone the repo
git clone --depth 1 https://github.com/oxy-hq/oxygen

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for oxy-evals

README.md
[![agentmods](https://agentmods.dev/badge/skills/oxy-hq/oxygen/oxy-evals/github.svg)](https://agentmods.dev/skills/oxy-hq/oxygen/oxy-evals)
Your own site
<a href="https://agentmods.dev/skills/oxy-hq/oxygen/oxy-evals"><img src="https://agentmods.dev/badge/skills/oxy-hq/oxygen/oxy-evals/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for oxy-evals

Your own site · 80×15
<a href="https://agentmods.dev/skills/oxy-hq/oxygen/oxy-evals"><img src="https://agentmods.dev/badge/skills/oxy-hq/oxygen/oxy-evals.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 193 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,758 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 5.1 $0.00193 $0.04758
Opus 5.5 $0.00077 $0.01903
Sonnet 5.5 $0.00039 $0.00952
Haiku 4.5 $0.00019 $0.00476

Measured yesterday against content hash 384bb5983558, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

oxy-evals 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

Copies of this mod

1 near-identical copy found in the catalogue:

  • oxy-evals — 100% identical, 0 lines differ
sdk/cli/skills/oxy-evals/SKILL.md · 363 lines

How it starts

The opening of the file, as written. The whole thing — 363 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Oxy evals: draft, run, diagnose, repair

An Oxy eval is a .test.yml file: a list of prompts, each with the answer a correct agent gives. oxy test runs the target agent on every prompt several times and asks an LLM judge whether each answer carries the expected facts.

Drafting the tests and repairing the agent are one loop:

  1. Draft cases and their expected answers from evidence.
  2. Run them and read the results.
  3. Diagnose each failure and repair the agent until it passes reliably.

The hard rule: the expected answer is the specification. Never weaken a test to make it pass. Don't loosen expected to match what the agent said, delete or skip a failing case, or rewrite a prompt to dodge the failure. If a test itself is wrong (a bad expected value, an ambiguous prompt), say so, show the evidence, and let the user decide. That's a different change from a repair, and you don't make it silently.

Reference docs (field tables, CI usage): https://www.oxygen-hq.com/docs/guide/build/test-evaluate/testing

What can be tested

  • Only .agentic.yml agents. oxy test rejects any other target, including classic .agent.yml agents (that runtime was removed). Inline tests: blocks inside agent or automation files are gone too. A .test.yml file is the only entry point.
  • Only the final answer text is judged. The judge sees the question, expected, and the agent's answer. It doesn't see the SQL, the tool calls, or the rows.
  • tool: on a case is accepted but not enforced. It has no effect on pass/fail. Don't rely on it to assert that the agent used a particular path.

The .test.yml format

name: Sales performance          # optional display name
target: agents/sales.agentic.yml # path from the project root; see "target" below

settings:
  runs: 3                        # times each case runs (default 3)
  concurrency: 5                 # agent runs in flight at once (default 5)
  judge_model: judge             # a model `name:` from config.yml (default: first model there)

cases:
  - name: total-revenue-2025     # optional, but always add it: it makes --case usable
    prompt: What was total revenue across all stores in 2025?
    expected: Total revenue across all stores in 2025 was approximately $6.7 billion.
    tags: [revenue, critical]

Read the full file on GitHub · 363 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 363 lines · 193 tokens per session scan A 384bb5983558

Subscribe to this mod's changes

oxy-evals is a skill published in the GitHub repository oxy-hq/oxygen (203 stars, last pushed yesterday), licensed Apache-2.0. It adds 193 tokens to every session and 4,758 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-16.

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