Home / breferrari / xcrew · GitHub

reference SKILL.md skillA

reference from breferrari/xcrew is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add breferrari/xcrew/reference@git:20261102.a0d42be

Pins git:20261102.a0d42be in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
breferrari/xcrew
Path
skills/reference/SKILL.md
Versions recorded
9
Latest version
git:20261102.a0d42be, committed Nov 2, 2026
First version recorded
Oct 28, 2026
Size
6,784 bytes
Repository stars
4
License
MIT

Reference for the Xcode MCP, MobileBuildMCP and Sosumi setup xcrew installs. Load before configuring either server, and when an Xcode MCP call fails ("not approved", "produced malformed response", "File not found in project structure", a timeout), a MobileBuildMCP tool is missing, LLDB refuses `expr`, or SourceKit reports `No such module`.

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

# xcrew reference

The routing table reaches each session at start. This file holds what each server needs to work and what to do when it doesn't. `xcrew doctor` checks what xcrew can't run without, its installation and the toolchain, and prints the fix for anything wrong.

## MobileBuildMCP

- Formerly XcodeBuildMCP: version 2.7.1 renamed the binary, the `MOBILEBUILDMCP_*` environment variables and the config folder, with no fallback to the old ones.
- Config: `.mobilebuildmcp/config.yaml`, read from the project root at server start. `xcrew setup` (or `/xcrew:setup`) writes it and marks it with `.mobilebuildmcp/.xcrew-managed`; a later setup rewrites a marked config and leaves an unmarked one alone. Delete the marker to keep hand edits.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add breferrari/xcrew/reference@sha256:3883962e188e3d2a

The line at the top of this page pins the label git:20261102.a0d42be, 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 badge

[![mdr](https://markdownregistry.com/badge/art_blc4yqaqfhloylzm.svg)](https://markdownregistry.com/a/art_blc4yqaqfhloylzm)

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

Versions

The registry has recorded 9 versions of this file, between Oct 28, 2026 and Nov 2, 2026, more than one a day.

versioncommittedcommitsizeaudit
git:20261102.a0d42be latest2026-11-02 a0d42be 6,784 BA view · diff
git:20261102.74e925e2026-11-02 74e925e 6,752 BA view · diff
git:20261102.40481a02026-11-02 40481a0 6,696 BA view · diff
git:20261030.527f1912026-10-30 527f191 6,794 BA view · diff
git:20261030.a900a6a2026-10-30 a900a6a 6,651 BA view · diff
git:20261029.ad3c3222026-10-29 ad3c322 6,217 BA view · diff
git:20261029.58bd4d42026-10-29 58bd4d4 6,104 BA view · diff
git:20261028.df36c192026-10-28 df36c19 6,019 BA view · diff
git:20261028.de25acf2026-10-28 de25acf 6,467 BA 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 (6784 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

breferrari/xcrew · 4 stars · license MIT · pushed 2026-11-04 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_blc4yqaqfhloylzm
GET https://markdownregistry.com/api/v1/resolve?ref=breferrari/xcrew/reference
GET https://markdownregistry.com/api/v1/blob/3883962e188e3d2adbac3fc7ad47c085d11724235ef6d4b6fd1c16b73a169275

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.

More from breferrari/xcrew

CLAUDE.md CLAUDE.md file
breferrari/xcrew · CLAUDE.md
git:20261030.249e6ee · audit A · 4 stars
setup SKILL.md skill
breferrari/xcrew · skills/setup/SKILL.md · Set up xcrew for this iOS project — write MobileBuildMCP's config with the right workspace, schemes and simulators…
git:20261103.786b5e9 · audit A · 4 stars

Every file in breferrari/xcrew

Other files named reference

reference SKILL.md skill
bluestep-systems/bluestep-ai · plugins/bluestep-one/skills/reference/SKILL.md · On-demand reference for building BlueStep One custom components — the type files and a component repo's setup, the…
git:20261105.de929a8 · audit A · 3 stars

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