What is shareplay-developer?

A development skill for adding SharePlay group experiences to visionOS 27 applications. SharePlay lets people take part in the same supported activity, while GroupActivities provides the Apple framework for defining and coordinating it.

Use it to define GroupActivities, build activation flows and SharePlay interface elements, manage GroupSession lifecycles, exchange messages and journals, create ShareLinks, and coordinate spatial experiences.

It helps developers handle the many parts of a shared experience, including starting an activity, joining sessions, exchanging messages, and keeping late joiners in sync.

shareplay-developer — Skill for Codex by tomkrikorian/visionOSAgents

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 tomkrikorian/visionOSAgents --skill shareplay-developer

Clone the repo

git clone --depth 1 https://github.com/tomkrikorian/visionOSAgents

Made for: 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/tomkrikorian/visionosagents/shareplay-developer/github.svg)](https://agentmods.dev/skills/tomkrikorian/visionosagents/shareplay-developer)

Your own site

<a href="https://agentmods.dev/skills/tomkrikorian/visionosagents/shareplay-developer"><img src="https://agentmods.dev/badge/skills/tomkrikorian/visionosagents/shareplay-developer/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/tomkrikorian/visionosagents/shareplay-developer"><img src="https://agentmods.dev/badge/skills/tomkrikorian/visionosagents/shareplay-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 674 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	$0.00050	$0.00674
Opus 5.5	$0.00020	$0.00270
Sonnet 5.5	$0.00010	$0.00135
Haiku 4.5	$0.00005	$0.00067

Measured 2mo ago against content hash ccbc9b586984, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

shareplay-developer 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.

skills/shareplay-developer/SKILL.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SharePlay Developer

Quick Start

Decide whether this experience is launch-only co-location or shared state sync.
Add the Group Activities capability and required entitlement before building SharePlay UI.
Define one GroupActivity per experience and keep the payload minimal and Codable.
Load the right reference only after you know the workflow.
For spatial personas or immersive spaces, load spatial-coordination.md before joining.

Load References When

Reference	When to Use
`activation-ui.md`	When wiring the SharePlay entry point or start button flow.
`activity-definition.md`	When defining the `GroupActivity` payload, metadata, or transfer representation.
`group-session-lifecycle.md`	When joining, leaving, observing, or presenting a `GroupSession`.
`messaging-journal.md`	When using `GroupSessionMessenger`, `GroupSessionJournal`, or late-joiner sync.
`shareplay-spatial-api.md`	When checking the official GroupActivities APIs for activation, association, session ownership, and spatial coordination.
`spatial-coordination.md`	When configuring `SystemCoordinator`, spatial templates, or group immersive-space behavior.
`visionos-immersive-space.md`	When implementing launch-only SharePlay for a visionOS immersive space.
`groupactivities-patterns.md`	When you need broader GroupActivities patterns or sample-backed examples.

Workflow

Define the activity and choose the activation surface.
Observe and configure the session before joining.
Add messaging or journal synchronization only if shared state is required.
Configure spatial coordination when the experience shares an immersive space.
Summarize the session lifecycle, sync model, and launch surface clearly.

Read the full file on GitHub · 65 lines

Files

What ships with it

12 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.

2mo ago First seen · 65 lines · 50 tokens per session scan A ccbc9b586984

Subscribe to this mod's changes

shareplay-developer is a skill published in the GitHub repository tomkrikorian/visionOSAgents (66 stars, last pushed 4mo ago), licensed MIT. It adds 50 tokens to every session and 674 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 2026-08-30.

Mobile

shareplay-developer next to 6 skills from other repositories
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shareplay-developertomkrikorian/visionOSAgents	Skill	66	4mo ago	MIT	A	50	Codex
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