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Agent skill

Updating Xcode Ddis

by doronz88 in doronz88/DeveloperDiskImage

A skill your agent uses when asked to "update ddis" / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode, to bump or pin LATESTDDIBUILDID in…

No licenceAuto-check passedMobile

Install Updating Xcode Ddis

skills CLI
$ npx skills add doronz88/DeveloperDiskImage --skill updating-xcode-ddis -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install doronz88/DeveloperDiskImage updating-xcode-ddis --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/doronz88/DeveloperDiskImage.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/updating-xcode-ddis .claude/skills/updating-xcode-ddis && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
updating-xcode-ddis
GitHub stars
170
Token cost
~1k tokens
SKILL.md length
505 words
Files
2
Skills in repo
1
Repo updated
First seen
Licence
None found

At a glance

A skill your agent uses when asked to "update ddis" / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode, to bump or pin LATESTDDIBUILDID in…

  • Works in 10 steps: Sync, read-only. git fetch --prune… → Model-list diff (required) → Prior attempts: gh pr list --state all… → …
  • Asked to update ddis / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode
  • SKILL.md covers Steps and Common mistakes
  • Runs Python scripts from its folder; calls git, gh and python3

What it does

Updating Xcode Ddis is an agent skill from doronz88/DeveloperDiskImage. Use when asked to "update ddis" / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode, to bump or pin LATESTDDIBUILDID in pymobiledevice3, when pymobiledevice3 warns "Downloaded personalized image has unexpected ProductBuildVersion", or when asked whether a new Xcode DDI adds supported device models.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `ddi_model_diff.py`).

It sits in Mobile, covering iOS development. It works with Xcode, Python, iOS and Git. The repository describes itself as: Home for both DeveloperDiskImage files (iOS < 17.0) and Personalized files (iOS = 17.0).

When your agent uses it

  • Asked to update ddis / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode
  • Pin LATESTDDIBUILDID in pymobiledevice3
  • Pymobiledevice3 warns Downloaded personalized image has unexpected ProductBuildVersion
  • Asked whether a new Xcode DDI adds supported device models

Example prompts

  • “update ddis”
  • “Downloaded personalized image has unexpected ProductBuildVersion”
  • “/updating-xcode-ddis”

Requirements

  • Python 3

Workflow steps

10 steps, taken from the first numbered list in SKILL.md.

  1. Sync, read-only. git fetch --prune origin in both repos. Local main may be months stale; every baseline below is origin/main.
  2. Model-list diff (required)
  3. Prior attempts: gh pr list --state all --search '' in both repos.
  4. Tell the user, verbatim from the diff output: old → new build, added/removed SupportedProductTypes, added/removed boards — also when it is…
  5. Branch from origin/main: git checkout -b bugfix/image- origin/main --no-track. Name taken by an earlier attempt → git log origin/main.. to…
  6. Refresh payloads with the repo's script — never copy files by hand
  7. DDI PR: git add PersonalizedImages; git commit -m 'maintenance: Update DDIs to ' (single quotes — the title contains backticks); push; gh…
  8. Pin PR in pymobiledevice3: branch feature/latest-ddi- from origin/master; set LATEST_DDI_BUILD_ID in…
  9. Merge order: DDI PR first. pymobiledevice3 downloads from the DDI repo's main (DEFAULT_REF in developer_disk_image/repo.py), so a pin…
  10. Declined or closed: gh pr close both, delete the remote branches, check out main/master, and list the leftover local branches for the user.

What it can do on your machine

Read from SKILL.md and the folder at commit 6eae353. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships script files (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • git
    • gh
    • python3
    • uv

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use git, gh and uv, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Updating Xcode Ddis loads about 1k tokens when it runs. Until then it costs about 94 tokens; SKILL.md has 505 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~94
When it runs · the whole SKILL.md, loaded when a task matches
~1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 505 words (~1,035 tokens).

“Two repos move together: this one publishes the payloads, pymobiledevice3 (checkout assumed at ~/dev/pymobiledevice3) pins the build id it expects. Report the model-list diff to the user before creating a branch or writing anything — it decides whether the update…”

— opening of SKILL.md by doronz88
name
updating-xcode-ddis

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in .claude/skills/updating-xcode-ddis of doronz88/DeveloperDiskImage.

  • SKILL.md
  • ddi_model_diff.py

Open the folder on GitHubat commit 6eae353

Compare with similar skills

Updating Xcode Ddis next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Updating Xcode Ddis compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Updating Xcode Ddis this skilldoronz88/DeveloperDiskImage170—~1kAutomated safety check: PassNone
iOS Simulator Skillconorluddy/ios-simulator-skill1.3k—~5.7kAutomated safety check: PassMIT
Anishelf Releasesamuelhe52/AniShelf141—~2kAutomated safety check: PassApache-2.0
Xcstrings ManagerEslzzyl/Pixiv-SwiftUI111—~482Automated safety check: PassAGPL-3.0
Wjs Auditing Projectjianshuo/claude-skills131—~2.5kAutomated safety check: PassMIT
Orca iOS Simulator Controlstablyai/orca88k1 repos~584Automated safety check: PassApache-2.0

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Works with

Categories

Questions about Updating Xcode Ddis

What does Updating Xcode Ddis do?

A skill your agent uses when asked to "update ddis" / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode, to bump or pin LATESTDDIBUILDID in…. Updating Xcode Ddis is an agent skill from doronz88/DeveloperDiskImage. Use when asked to "update ddis" / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode, to bump or pin LATESTDDIBUILDID in pymobiledevice3, when pymobiledevice3 warns "Downloaded personalized image has unexpected ProductBuildVersion", or when asked whether a new Xcode DDI adds supported device models.

When should I use Updating Xcode Ddis?

Updating Xcode Ddis fits situations like: asked to update ddis / refresh the DeveloperDiskImage repository (doronz88/DeveloperDiskImage) from a newly installed Xcode; pin LATESTDDIBUILDID in pymobiledevice3; pymobiledevice3 warns Downloaded personalized image has unexpected ProductBuildVersion; asked whether a new Xcode DDI adds supported device models.

How do I install Updating Xcode Ddis in Claude Code?

Run `npx skills add doronz88/DeveloperDiskImage --skill updating-xcode-ddis -a claude-code`. Or copy the skill folder (.claude/skills/updating-xcode-ddis in doronz88/DeveloperDiskImage) into .claude/skills/updating-xcode-ddis in your project. Claude Code loads it when a task matches its description.

How do I install Updating Xcode Ddis in Codex?

Run `npx skills add doronz88/DeveloperDiskImage --skill updating-xcode-ddis -a codex`. Or copy the skill folder (.claude/skills/updating-xcode-ddis in doronz88/DeveloperDiskImage) into .agents/skills/updating-xcode-ddis in your project. Codex loads it when a task matches its description.

Can I use Updating Xcode Ddis in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add doronz88/DeveloperDiskImage --skill updating-xcode-ddis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/updating-xcode-ddis, .gemini/skills/updating-xcode-ddis, .github/skills/updating-xcode-ddis and .opencode/skills/updating-xcode-ddis in your project.

What does Updating Xcode Ddis need to run?

Going by SKILL.md and its folder, Updating Xcode Ddis needs Python for the scripts in its folder and the command-line tools its instructions call (git, gh, python3 and uv). Our summary lists: Python 3.

Does Updating Xcode Ddis access the network?

SKILL.md contains no URLs. Its commands use git, gh and uv, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Updating Xcode Ddis safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Updating Xcode Ddis use?

No licence was found for Updating Xcode Ddis or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Updating Xcode Ddis use?

About 1k tokens (SKILL.md is roughly 4.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Updating Xcode Ddis?

Skills that share tags, products or a category with Updating Xcode Ddis: iOS Simulator Skill (conorluddy/ios-simulator-skill, 1.3k stars), Anishelf Release (samuelhe52/AniShelf, 141 stars), Xcstrings Manager (Eslzzyl/Pixiv-SwiftUI, 111 stars) and Wjs Auditing Project (jianshuo/claude-skills, 131 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Updating Xcode Ddis?

doronz88 (a GitHub user) maintains it in doronz88/DeveloperDiskImage, which has 170 GitHub stars. The repository was last updated on September 30, 2026.

Source: doronz88/DeveloperDiskImage on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.