orval

orval is a skill for Claude Code, Codex from pproenca/dot-skills. It costs 75 tokens per session (1,238 once invoked), scanned A, original, MIT.

A guide to Orval, a tool that generates TypeScript API clients and data-fetching hooks from an OpenAPI specification, which is a machine-readable description of an API.

In plain words
What is it for?
It is for configuring generated clients, React Query, SWR, or Vue Query hooks, custom request handlers, type checks, and MSW test mocks.
Why use it?
It helps keep frontend API code, types, authentication handling, and test mocks aligned with the documented backend API.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions AGENTS.md.

Good fit It is for configuring generated clients, React Query, SWR, or Vue Query hooks, custom request handlers, type checks, and MSW test mocks.

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Install with agentmods
npx agentmods add skills/pproenca/dot-skills/orval
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 pproenca/dot-skills --skill orval
Clone the repo
git clone --depth 1 https://github.com/pproenca/dot-skills

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 orval

README.md
[![agentmods](https://agentmods.dev/badge/skills/pproenca/dot-skills/orval/github.svg)](https://agentmods.dev/skills/pproenca/dot-skills/orval)
Your own site
<a href="https://agentmods.dev/skills/pproenca/dot-skills/orval"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/orval/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 orval

Your own site · 80×15
<a href="https://agentmods.dev/skills/pproenca/dot-skills/orval"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/orval.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,238 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 72
    Skill allows unbounded resource consumption (API calls, storage, compute). Without rate limits or quotas, a compromised or misbehaving agent can cause denial-of-service or cost overruns.
    Fix: Set explicit rate limits, timeouts, and resource quotas for API calls, file operations, and compute. Implement circuit breakers for runaway loops.
How audits are shown
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 $0.00075 $0.01238
Opus 5 $0.00037 $0.00619
Sonnet 5 $0.00015 $0.00248
Haiku 4.5 $0.00007 $0.00124

Measured 6d ago against content hash f0296e6c5e19, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

orval 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 6d ago.

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.

skills/.experimental/orval/SKILL.md · 117 lines

How it starts

The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Orval OpenAPI Best Practices

Comprehensive guide for generating type-safe TypeScript clients from OpenAPI specifications using Orval. Contains 42 rules across 8 categories, prioritized by impact to guide automated configuration, client generation, and testing setup.

When to Apply

Reference these guidelines when:

  • Configuring Orval for a new project
  • Setting up OpenAPI-based TypeScript client generation
  • Integrating React Query, SWR, or Vue Query with generated hooks
  • Creating custom mutators for authentication and error handling
  • Generating MSW mocks for testing

Rule Categories by Priority

Priority Category Impact Prefix
1 OpenAPI Specification Quality CRITICAL spec-
2 Configuration Architecture CRITICAL orvalcfg-
3 Output Structure & Organization HIGH output-
4 Custom Client & Mutators HIGH mutator-
5 Query Library Integration MEDIUM-HIGH oquery-
6 Type Safety & Validation MEDIUM types-
7 Mock Generation & Testing MEDIUM mock-
8 Advanced Patterns LOW adv-

Quick Reference

1. OpenAPI Specification Quality (CRITICAL)

  • spec-operationid-unique - Use unique and descriptive operationIds
  • spec-schemas-reusable - Define reusable schemas in components
  • spec-tags-organization - Organize operations with tags
  • spec-response-types - Define all response types explicitly
  • spec-required-fields - Mark required fields explicitly

2. Configuration Architecture (CRITICAL)

  • orvalcfg-mode-selection - Choose output mode based on API size
  • orvalcfg-client-selection - Select client based on framework requirements
  • orvalcfg-separate-schemas - Separate schemas into dedicated directory
  • orvalcfg-input-validation - Validate OpenAPI spec before generation
  • orvalcfg-baseurl-setup - Configure base URL properly
  • orvalcfg-prettier-format - Enable automatic code formatting

3. Output Structure & Organization (HIGH)

Read the full file on GitHub · 117 lines

Files

What ships with it

47 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. 6d ago First seen · 117 lines · 75 tokens per session scan A f0296e6c5e19

Subscribe to this mod's changes

orval is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 75 tokens to every session and 1,238 once invoked, about $0.0004 per session on Opus 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 2026-09-03.

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