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ios-simulator-boot-health SKILL.md skillA

ios-simulator-boot-health from the-artificer-of-ciphers-llc/skills-from-the-artificer is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add the-artificer-of-ciphers-llc/skills-from-the-artificer/ios-simulator-boot-health@git:20261108.bad6531

Pins git:20261108.bad6531 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: the-artificer-of-ciphers-llc/skills-from-the-artificer
Path: ios-simulator-boot-health/SKILL.md
Versions recorded: 1
Latest version: git:20261108.bad6531, committed Nov 8, 2026
Size: 3,635 bytes
Repository stars: 6
License: MIT

Diagnose and handle iOS simulator boot failures on the shared Mac when running scripts/test-ios.sh - "PosterBoard status -5", exit 77 (no healthy simulator), settle-gate REJECT, a shard that ran no tests. Use before re-running, erasing or shutting down any simulator, and when judging whether a test run actually passed.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# iOS simulator boot health (shared Mac)

This Mac is shared with other sessions. Only two simulators are ours: **iPhone 17** (`85330DFD-25C3-402F-A529-36CA09154BC1`) and **iPhone 18 Pro Max** (`5CEF7C7B-7E33-40F7-B5D8-4736CD14222F`). iPhone 18 Pro and iPhone 17e belong to another session; iPhone Air is avoided. Rotate between ours per run (memory `rotate-ios-simulators`).

## What the failure is

`PosterBoard status -5` in `<results>-diag/settle.txt` is the wrapper reading `launchctl list` column 2 for `com.apple.PosterBoard` inside the simulator (`scripts/lib/ios-diag.sh`, `coincert_diag_settle_sample`). Negative status = killed by that signal; -5 = SIGTRAP. It is a real crash, not an over-strict check: macOS wrote `PosterBoard-*.ips` for it (6 reports 10-25..10-26, 5 in `+[NSURL(PosterFoundation) pf_posterPathInstanceURLForVersionsURL:version:]`, an assert while ingesting a poster version at first boot). No jetsam, memory or disk signal. Cause is unconfirmed (stale poster store is likely, unverified). Full evidence: `references/posterboard-research.md`.

## Run it this way

```
COINCERT_SIM_PINNED_ERASE=1 COINCERT_SIM_UDID=<ours> COINCERT_SIM_NAME=<name> \
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add the-artificer-of-ciphers-llc/skills-from-the-artificer/ios-simulator-boot-health@sha256:a0671ec62913c7b6

The line at the top of this page pins the label git:20261108.bad6531, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_tqjlcuxtxxwxwuij.svg)](https://markdownregistry.com/a/art_tqjlcuxtxxwxwuij)

0 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Nov 8, 2026.

version	committed	commit	size	audit
git:20261108.bad6531 latest	2026-11-08	bad6531	3,635 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (3635 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

the-artificer-of-ciphers-llc/skills-from-the-artificer · 6 stars · license MIT · pushed 2026-11-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_tqjlcuxtxxwxwuij
GET https://markdownregistry.com/api/v1/resolve?ref=the-artificer-of-ciphers-llc/skills-from-the-artificer/ios-simulator-boot-health
GET https://markdownregistry.com/api/v1/blob/a0671ec62913c7b69614267e3dfbe691276c1f8498e830736552a9ba84f3070f

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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