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oastools: Instructions file for GitHub Copilot

.github/copilot-instructions.md

oastools copilot-instructions.md is an instructions file for GitHub Copilot from erraggy/oastools. It costs 4,046 tokens per session, scanned A, original, MIT.

Repository-specific instructions for GitHub Copilot, an AI coding assistant, when working on oastools, a Go tool for reading and changing OpenAPI files. They describe the project, coding rules, tests, and OpenAPI concepts.

In plain words
What is it for?
Use them when changing oastools code, setting up its development tools, checking OpenAPI-related work, or writing tests and benchmarks.
Why use it?
They give Copilot the project context and boundaries it needs to suggest compatible code and avoid known mistakes.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is erraggy/oastools's own configuration. It tells GitHub Copilot how to work on oastools itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything oastools configures →

not rated 6repo 9d ago A scan 4,046 tokens original MIT
View source ↗ erraggy/oastools erraggy.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to erraggy/oastools. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/erraggy/oastools/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/erraggy/oastools

Made for: GitHub Copilot.

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.

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README.md
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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.

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<a href="https://agentmods.dev/instructions/erraggy/oastools/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/erraggy/oastools/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 4,046 This file is loaded in full into every session.
When invoked 4,046 The same file — it is already loaded in full.
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 $0.04046 $0.04046
Opus 5.5 $0.01618 $0.01618
Sonnet 5.5 $0.00809 $0.00809
Haiku 4.5 $0.00405 $0.00405

Measured 1mo ago against content hash 65aa34c8cee7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

oastools copilot-instructions.md 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 1mo 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.

.github/copilot-instructions.md · 442 lines

How it starts

The opening of the file, as written. The whole thing — 442 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot Instructions for oastools

This file provides guidance to GitHub Copilot when working with code in this repository.

How to Use This File

GitHub Copilot uses these instructions to:

  • Understand the project structure, conventions, and best practices
  • Make informed decisions when generating or modifying code
  • Follow the same standards that human developers follow
  • Avoid common pitfalls specific to this codebase

Read through all sections before making changes. Pay special attention to:

  • Development Environment Setup - Install golangci-lint v2 before running make check
  • Acceptance Criteria - Know when a task is truly complete
  • Boundaries and Exclusions - Files and directories you should never modify
  • Testing Requirements - All exported functionality must have comprehensive tests
  • Benchmark Test Requirements - Use Go 1.24+ for b.Loop() pattern

Project Overview

oastools is a Go-based command-line tool for working with OpenAPI Specification (OAS) files. The primary goals are:

  • Validating OpenAPI specification files
  • Parsing and analyzing OAS documents
  • Joining multiple OpenAPI specification documents
  • Converting between OAS versions
  • Comparing OAS documents and detecting breaking changes

Specification References

This tool supports the following OpenAPI Specification versions:

All OAS versions utilize the JSON Schema Specification Draft 2020-12: https://www.ietf.org/archive/id/draft-bhutton-json-schema-01.html

Key OpenAPI Specification Concepts

OAS Version Evolution

OAS 2.0 (Swagger) → OAS 3.0:

  • Servers: host, basePath, and schemes → unified servers array with URL templates
  • Components: definitions, parameters, responses, securityDefinitions → components.*
  • Request Bodies: consumes + body parameter → requestBody.content with media types
  • Response Bodies: produces + schema → responses.*.content with media types
  • Security: securityDefinitions → components.securitySchemes with flows restructuring
  • New Features: Links, callbacks, and more flexible parameter serialization

Read the full file on GitHub · 442 lines

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. 1mo ago First seen · 442 lines · 4,046 tokens per session scan A 65aa34c8cee7

Subscribe to this mod's changes

oastools copilot-instructions.md is an instructions file published in the GitHub repository erraggy/oastools (6 stars, last pushed 9d ago), licensed MIT. It adds 4,046 tokens to every session, about $0.0162 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 2026-08-31.

Backend and APIsGoLanguagesgoopenapiopenapi-specificationopenapi3openapi31swagger
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