Recipe Compare Sheet Tabs
googleworkspace/cli
Read data from two tabs in a Google Sheet to compare and identify differences.
Compare A vs B, weigh pros and cons of A, B, C, ..., or explain the nuance between sentences — a quick answer from what the model already knows
MITAuto-check passed
Install Difference
$ npx skills add vinta/hal-9000 --skill difference -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install vinta/hal-9000 difference --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/vinta/hal-9000.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/difference .claude/skills/difference && rm -rf skills-srcUse ~/.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/
Install the "difference" agent skill from https://github.com/vinta/hal-9000/tree/main/skills/difference into .claude/skills/difference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "difference", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/vinta/hal-9000/tree/main/skills/differenceType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add vinta/hal-9000 --skill difference -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install vinta/hal-9000 difference --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vinta/hal-9000.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/difference .agents/skills/difference && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "difference" agent skill from https://github.com/vinta/hal-9000/tree/main/skills/difference into .agents/skills/difference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "difference", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vinta/hal-9000 --skill difference -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install vinta/hal-9000 difference --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vinta/hal-9000.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/difference .cursor/skills/difference && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "difference" agent skill from https://github.com/vinta/hal-9000/tree/main/skills/difference into .cursor/skills/difference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "difference", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/vinta/hal-9000.git --path skills/difference--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add vinta/hal-9000 --skill difference -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install vinta/hal-9000 difference --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vinta/hal-9000.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/difference .gemini/skills/difference && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "difference" agent skill from https://github.com/vinta/hal-9000/tree/main/skills/difference into .gemini/skills/difference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "difference", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install vinta/hal-9000 differenceInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add vinta/hal-9000 --skill difference -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/vinta/hal-9000.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/difference .github/skills/difference && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "difference" agent skill from https://github.com/vinta/hal-9000/tree/main/skills/difference into .github/skills/difference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "difference", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vinta/hal-9000 --skill difference -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install vinta/hal-9000 difference --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vinta/hal-9000.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/difference .opencode/skills/difference && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "difference" agent skill from https://github.com/vinta/hal-9000/tree/main/skills/difference into .opencode/skills/difference/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "difference", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
difference- GitHub stars
- 138
- Token cost
- ~367 tokens
- SKILL.md length
- 192 words
- Files
- 2
- Skills in repo
- 15
- Repo updated
- First seen
- Licence
- MIT
At a glance
Compare A vs B, weigh pros and cons of A, B, C, ..., or explain the nuance between sentences — a quick answer from what the model already knows
- SKILL.md covers Lookups and Answer
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Difference is an agent skill from vinta/hal-9000. Compare A vs B, weigh pros and cons of A, B, C, ..., or explain the nuance between sentences — a quick answer from what the model already knows
Its SKILL.md is about 370 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
The repository describes itself as: Opinionated AI coding agent and dev environment automation for macOS. The licence is MIT.
Example prompts
- “/difference”
Requirements
- Pre-approved tools (allowed-tools): WebSearch
What it can do on your machine
Read from SKILL.md and the folder at commit 0a2005a. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
WebSearch
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
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
Difference loads about 367 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 192 words of instructions outside code blocks.
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 vinta/hal-9000 at commit 0a2005a, republished under its MIT licence (© vinta). 192 words, ~367 tokens.
Download SKILL.mdSave it as
.claude/skills/difference/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- difference
- description
- Compare A vs B, weigh pros and cons of A, B, C, ..., or explain the nuance between sentences — a quick answer from what the model already knows
- allowed-tools
- WebSearch
- argument-hint
- [A vs B | A, B, C, ... | sentences]
- disable-model-invocation
- true
- effort
- low
Difference
The user wants a fast answer, not research. Invoking this skill is their explicit opt-out of any standing rule to check docs or search before answering: answer from what you already know.
Compare what the arguments name. With no arguments, compare the items just discussed; ask only when nothing comparable is there.
Lookups
Run one web search (WebSearch in Claude Code, web_search in Codex) only for an item you cannot identify at all, such as a tool released after your training or an unknown term, then answer. Being unsure of an item's latest version does not count. Use no subagents.
Answer
Keep it as short as the question allows, and let the items decide the shape. Spend the words on where they actually differ, not on what they share.
- Alternatives someone picks between (tools, approaches, patterns): give each one's pros and cons.
- Sentences: how each lands differently — tone, implication, what a reader infers.
- An answer that hinges on a version, price, or "latest" fact: add one line saying it is as of your training data.
The last line of the answer is still comparison: no verdict, no offer to dig deeper.
© vinta, MIT. 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 1 other file in skills/difference of vinta/hal-9000.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit 0a2005a
Compare with similar skills
Difference 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Difference this skillvinta/hal-9000 | 138 | — | ~367 | Automated safety check: Pass | MIT | |
| Recipe Compare Sheet Tabsgoogleworkspace/cli | 31k | — | ~182 | Automated safety check: Pass | Apache-2.0 | |
| Geo Comparesickn33/agentic-awesome-skills | 47k | 1 repos | ~2.7k | Automated safety check: Notes | MIT | |
| Comparetaishi-i/awesome-japanese-nlp-resources | 1k | — | ~4.1k | Automated safety check: Notes | CC0-1.0 | |
| Nemoclaw Maintainer PR ComparatorNVIDIA/NemoClaw | 23k | — | ~1.8k | Automated safety check: Pass | Apache-2.0 | |
| Experiment Detail Comparatoraipoch/medical-research-skills | 2k | — | ~3.3k | Automated safety check: Notes | MIT |
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Questions about Difference
What does Difference do?
Compare A vs B, weigh pros and cons of A, B, C, ..., or explain the nuance between sentences — a quick answer from what the model already knows. Difference is an agent skill from vinta/hal-9000.
How do I install Difference in Claude Code?
Run `npx skills add vinta/hal-9000 --skill difference -a claude-code`. Or copy the skill folder (skills/difference in vinta/hal-9000) into .claude/skills/difference in your project. Claude Code loads it when a task matches its description.
How do I install Difference in Codex?
Run `npx skills add vinta/hal-9000 --skill difference -a codex`. Or copy the skill folder (skills/difference in vinta/hal-9000) into .agents/skills/difference in your project. Codex loads it when a task matches its description.
Can I use Difference 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 vinta/hal-9000 --skill difference -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/difference, .gemini/skills/difference, .github/skills/difference and .opencode/skills/difference in your project.
What does Difference need to run?
SKILL.md names no scripts, command-line tools or credentials: Difference is instructions for the agent only. Its frontmatter pre-approves these tools: WebSearch.
Does Difference 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 Difference 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 Difference use?
Difference is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Difference use?
About 367 tokens (SKILL.md is roughly 1.5k 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 Difference?
Skills that share tags, products or a category with Difference: Recipe Compare Sheet Tabs (googleworkspace/cli, 31k stars), Geo Compare (sickn33/agentic-awesome-skills, 47k stars), Compare (taishi-i/awesome-japanese-nlp-resources, 1k stars) and Nemoclaw Maintainer PR Comparator (NVIDIA/NemoClaw, 23k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Difference?
vinta (a GitHub user) maintains it in vinta/hal-9000, which has 138 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on October 5, 2026.
Source: vinta/hal-9000 on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.