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SwiftUIBackports: Instructions file for Codex

AGENTS.md

SwiftUIBackports AGENTS.md is an instructions file for Codex, OpenCode from shaps80/SwiftUIBackports. It costs 653 tokens per session, scanned A, original, MIT.

A concise development guide for SwiftUIBackports, a Swift package that provides newer Apple SwiftUI features on older operating systems. SwiftUI is Apple’s framework for building app interfaces.

In plain words
What is it for?
Use it when adding or updating a SwiftUI backport, checking API signatures and availability, or verifying package changes against the project’s reference files.
Why use it?
It sets the checks and compatibility rules needed to make backported APIs behave and look like Apple’s native APIs.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is shaps80/SwiftUIBackports's own configuration. It tells Codex and OpenCode how to work on SwiftUIBackports 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 SwiftUIBackports configures →

not rated 1.1krepo +1 4mo ago A scan 653 tokens original MIT
View source ↗ shaps80/SwiftUIBackports
About the project

SwiftUIBackports is a Swift package that recreates selected newer SwiftUI APIs for older versions of Apple’s operating systems, using familiar names and behavior where practical. Swift developers use it to adopt newer interface patterns while keeping applications compatible with earlier iOS, macOS, tvOS, and watchOS releases. The catalogue entries include agents, instructions, and a discovery skill that help coding agents locate and use the available backports.

shaps80/SwiftUIBackports · 1,100 stars · on GitHub

Reuse

Borrowing it

Nothing to install: this file belongs to shaps80/SwiftUIBackports. 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/shaps80/SwiftUIBackports/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/shaps80/SwiftUIBackports

Made for: Codex, OpenCode.

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Per session 653 This file is loaded in full into every session.
When invoked 653 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 $0.00653 $0.00653
Opus 5.5 $0.00261 $0.00261
Sonnet 5.5 $0.00131 $0.00131
Haiku 4.5 $0.00065 $0.00065

Measured 2mo ago against content hash bf69a83c5ae7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

SwiftUIBackports AGENTS.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 2mo 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.

AGENTS.md · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

When talking to the user, sacrifice grammar for concision.

First Reads

Before code work, read CONTEXT.md. It defines project terms, API-shape expectations, availability rules, and release policy. If an ADR exists under docs/adr/ for the area you touch, read it too.

When implementing a SwiftUI API backport, check refs/swiftui-*.ref and refs/swiftuicore-*.ref for Xcode SwiftUI/SwiftUICore module interface references. Use the newest versioned refs to confirm native signatures, overload sets, generics, availability, and hidden helper types before shaping public API.

If the available SwiftUI max version is newer than the newest ref version in refs/, tell the user the ref files may need updating before relying on them.

Project Rules

  • This is a SwiftPM library, not an app.
  • Main target is SwiftUIBackports.
  • Preserve Apple SwiftUI API parity for backports: names, overloads, behavior, docs, and availability should match native APIs where practical.
  • Use the refs to discover official API introduction versions. Backport APIs should be deprecated on each platform at the version where the native API was introduced for that platform. Example: if presentationBackgroundInteraction is officially introduced on iOS 16.3, the iOS deprecation for the backport should be 16.3.
  • When a full SwiftUI type is backported, usually put native-availability deprecation on the backported type itself, not every initializer, method, or extension on that type. Add member-level deprecations only when needed, such as a member whose native API was introduced in a different version. This does not apply to modifiers, environment values, or other non-type API backports.
  • Prefer .backport modifiers for view/transition APIs and Backport<Any> for pure namespace types.
  • Keep UIKit/AppKit bridge details internal/private unless public API parity demands exposure.
  • Use @available and #if os(...) deliberately. Minimum floors are iOS 13, tvOS 13, watchOS 6, macOS 10.15.
  • Do not move deprecated APIs casually. Deprecation shims are source-compatibility promises.
  • PRs need exactly one release label: release:major or release:minor.

Read the full file on GitHub · 45 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. 2mo ago First seen · 45 lines · 653 tokens per session scan A bf69a83c5ae7

Subscribe to this mod's changes

SwiftUIBackports AGENTS.md is an instructions file published in the GitHub repository shaps80/SwiftUIBackports (1,100 stars, last pushed 4mo ago), licensed MIT. It adds 653 tokens to every session, about $0.0026 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 2026-08-30.

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SwiftUIBackports AGENTS.md compared with instructions from other repositories

SwiftUIBackports AGENTS.md next to 6 instructions from other repositories
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