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Agent skill

Check Upstream Changes

by onevcat in onevcat/Prowl

Check upstream (supabitapp/supacode) for new changes since the last reviewed baseline.

Custom licenceAuto-check passedFrontend & Design

Install Check Upstream Changes

skills CLI
$ npx skills add onevcat/Prowl --skill check-upstream-changes -a claude-code

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

GitHub CLI
$ gh skill install onevcat/Prowl check-upstream-changes --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/onevcat/Prowl.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/check-upstream-changes .claude/skills/check-upstream-changes && 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
check-upstream-changes
GitHub stars
638
Token cost
~435 tokens
SKILL.md length
162 words
Files
1
Skills in repo
10
Repo updated
First seen
Licence
Custom licence

At a glance

Check upstream (supabitapp/supacode) for new changes since the last reviewed baseline.

  • Works in 7 steps: Read… → Fetch the upstream remote → List all commits on upstream/main that… → …
  • Frontend & Design work in your project
  • Calls git

What it does

Check Upstream Changes is an agent skill from onevcat/Prowl. Check upstream (supabitapp/supacode) for new changes since the last reviewed baseline.

Its SKILL.md is about 440 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design. The repository describes itself as: native macOS codings agent orchestrator.

When your agent uses it

  • Frontend & Design work in your project

Example prompts

  • “/check-upstream-changes”

Workflow steps

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

  1. Read docs-ai/017-upstream-sync-process/upstream-ledger.md and extract the Upstream Baseline commit hash and date.
  2. Fetch the upstream remote
  3. List all commits on upstream/main that are newer than the baseline commit
  4. For each new commit (or group of related commits), produce a one-line summary including
  5. Categorize commits into
  6. Present the briefing in this format
  7. Do NOT modify any files or run sync. This command is read-only reconnaissance.

What it can do on your machine

Read from SKILL.md and the folder at commit 386b8d0. 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

    Shell commands in SKILL.md call:

    • git

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

  • Network

    No URLs in SKILL.md. Its commands use git, 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

Check Upstream Changes loads about 435 tokens when it runs. Until then it costs about 27 tokens; SKILL.md has 162 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~27
When it runs · the whole SKILL.md, loaded when a task matches
~435

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 162 words (~435 tokens).

“Check upstream (supabitapp/supacode) for new changes since the last reviewed baseline.”

— opening of SKILL.md by onevcat, Custom licence
name
check-upstream-changes

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/check-upstream-changes of onevcat/Prowl.

Open the folder on GitHubat commit 386b8d0

Compare with similar skills

Check Upstream Changes 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.

Check Upstream Changes compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Check Upstream Changes this skillonevcat/Prowl638—~435Automated safety check: PassCustom licence
Web Artifacts Builderanthropics/skills180k41 repos~769Automated safety check: PassApache-2.0
React Doctormakeplane/plane61k12 repos~657Automated safety check: PassAGPL-3.0
Impeccablebestofjs/bestofjs3.1k27 repos~2.6kAutomated safety check: PassMIT
Figma Design System Builderwarpdotdev/warp65k2 repos~4.4kAutomated safety check: PassAGPL-3.0
Web Interface Guidelines Reviewervercel-labs/openreview1.7k98 repos~308Automated safety check: PassNone

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  • Prowl Performance Benchmark Runner

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Categories

Questions about Check Upstream Changes

What does Check Upstream Changes do?

Check upstream (supabitapp/supacode) for new changes since the last reviewed baseline. Check Upstream Changes is an agent skill from onevcat/Prowl. Check upstream (supabitapp/supacode) for new changes since the last reviewed baseline.

When should I use Check Upstream Changes?

Check Upstream Changes fits situations like: frontend & Design work in your project.

How do I install Check Upstream Changes in Claude Code?

Run `npx skills add onevcat/Prowl --skill check-upstream-changes -a claude-code`. Or copy the skill folder (.claude/skills/check-upstream-changes in onevcat/Prowl) into .claude/skills/check-upstream-changes in your project. Claude Code loads it when a task matches its description.

How do I install Check Upstream Changes in Codex?

Run `npx skills add onevcat/Prowl --skill check-upstream-changes -a codex`. Or copy the skill folder (.claude/skills/check-upstream-changes in onevcat/Prowl) into .agents/skills/check-upstream-changes in your project. Codex loads it when a task matches its description.

Can I use Check Upstream Changes 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 onevcat/Prowl --skill check-upstream-changes -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/check-upstream-changes, .gemini/skills/check-upstream-changes, .github/skills/check-upstream-changes and .opencode/skills/check-upstream-changes in your project.

What does Check Upstream Changes need to run?

Going by SKILL.md and its folder, Check Upstream Changes needs the command-line tools its instructions call (git).

Does Check Upstream Changes access the network?

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

Is Check Upstream Changes 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 Check Upstream Changes use?

Check Upstream Changes has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Check Upstream Changes use?

About 435 tokens (SKILL.md is roughly 1.7k 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 Check Upstream Changes?

Skills that share tags, products or a category with Check Upstream Changes: Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 61k stars), Impeccable (bestofjs/bestofjs, 3.1k stars) and Figma Design System Builder (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Check Upstream Changes?

onevcat (a GitHub user) maintains it in onevcat/Prowl, which has 638 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on October 6, 2026.

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