A save-and-load service for games that uses the same code on desktop and in web browsers. It stores named text values asynchronously and supports an in-memory backend for tests.

Use it for saved games, high scores, and settings, including browser storage through `localStorage` and desktop storage in a user folder.

It avoids writing separate storage code for each platform. It also makes game-data tests possible without changing real player saves.

persistence — Skill for Claude Code and Codex by vchelaru/FlatRedBall2

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 vchelaru/FlatRedBall2 --skill persistence

Clone the repo

git clone --depth 1 https://github.com/vchelaru/FlatRedBall2

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/vchelaru/flatredball2/persistence/github.svg)](https://agentmods.dev/skills/vchelaru/flatredball2/persistence)

Your own site

<a href="https://agentmods.dev/skills/vchelaru/flatredball2/persistence"><img src="https://agentmods.dev/badge/skills/vchelaru/flatredball2/persistence/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/vchelaru/flatredball2/persistence"><img src="https://agentmods.dev/badge/skills/vchelaru/flatredball2/persistence.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 252 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.

Model	Per session	Once invoked
Fable 5.1	$0.00044	$0.00252
Opus 5.5	$0.00018	$0.00101
Sonnet 5.5	$0.00009	$0.00050
Haiku 4.5	$0.00004	$0.00025

Measured 4d ago against content hash 8a741dff8e5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

persistence 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 4d 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.

frb-skills/persistence/SKILL.md · 14 lines

What it actually says

Persistence

Engine.Storage (GameStorage in src/IO) is the save/load API: async, string-keyed, same code on desktop and web, so no System.IO.File or #if. The XML docs on GameStorage and IStorageBackend list the calls.

Set EngineInitSettings.StorageName. If it is unset, the first storage call throws on every platform.
OpenWriteAsync stores nothing until CommitAsync. Disposing without committing discards the write.
Desktop writes files under a per-user folder (StorageRootDirectory overrides it). Web uses localStorage: a write past its size limit throws StorageException, and Engine.Storage.IsPersistent is false if the browser blocks it.
Tests: a bare FlatRedBallService uses InMemoryStorageBackend. Assign Engine.Storage.Backend after Initialize to swap it.

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.

4d ago First seen · 14 lines · 44 tokens per session scan A 8a741dff8e5b

Subscribe to this mod's changes

persistence is a skill published in the GitHub repository vchelaru/FlatRedBall2 (15 stars, last pushed yesterday), licensed MIT. It adds 44 tokens to every session and 252 once invoked, about $0.0002 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 2026-10-17.

Game development

playtest-report

Structured playtest report template, or turn existing playtest notes into structured feedback.

Donchitos/Claude-Code-Game-Studios · 20 tokens

godot-signals-groups

Build event-driven, decoupled Godot 4.7 gameplay with signals and node groups: declare and emit custom signals, connect with Callables (incl. bind/one-shot), and broadcast to many nodes via groups and callgroup. Use when wiring node communication in a Godot project, replacing tight references with signals…

gamedev-skills/awesome-gamedev-agent-skills · 95 tokens

motion

Reconstruct a skeleton from calibrated mesh projections and sequential VLM joint annotations, then fit joints and skin weights. Generate motion from joint-position trajectories, rhythm and contact constraints through IK; refine bone orientation against the action, then export, retarget and validate on the target mesh.

OpenDCAI/GameFactory-3A · 0 tokens

persistence