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Agent skill

Sc Skill

by jazzyalex in jazzyalex/agent-sessions

Capture deterministic macOS screenshots for testing, docs, release notes, and marketing assets.

MITAuto-check passedDevelopment

Install Sc Skill

skills CLI
$ npx skills add jazzyalex/agent-sessions --skill sc-skill -a claude-code

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

GitHub CLI
$ gh skill install jazzyalex/agent-sessions sc-skill --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/jazzyalex/agent-sessions.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sc-skill .claude/skills/sc-skill && 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
sc-skill
GitHub stars
894
Token cost
~884 tokens
SKILL.md length
320 words
Files
8 (incl. scripts, references)
Skills in repo
8
Repo updated
First seen
Licence
MIT

At a glance

Capture deterministic macOS screenshots for testing, docs, release notes, and marketing assets.

  • Works in 3 steps: Normalize window size and position → Capture one screenshot (auto-select tool) → Run a manifest batch
  • Asked to automate app screenshots
  • SKILL.md covers Overview, Quick Start, Workflow and Guardrails, plus 1 more section
  • Runs Shell scripts from its folder

What it does

Sc Skill is an agent skill from jazzyalex/agent-sessions. Capture deterministic macOS screenshots for testing, docs, release notes, and marketing assets. Use when asked to automate app screenshots, batch-generate screenshot sets, standardize window sizing/composition, or choose between Peekaboo and native macOS screenshot tooling.

Its SKILL.md is about 880 tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including scripts and reference files (for example `agents/openai.yaml`, `references/tool-matrix.md` and `references/workflow-checklist.md`).

It sits in Development, covering Changelog and release notes. It works with macOS. The repository describes itself as: Local-first macOS app to browse, search, analyze, and resume supported AI coding-agent session history across Codex, Claude Code, OpenCode, Cursor Agent, Antigravity, Hermes… The licence is MIT.

When your agent uses it

  • Asked to automate app screenshots
  • Batch-generate screenshot sets
  • Standardize window sizing/composition
  • Choose between Peekaboo and native macOS screenshot tooling

Example prompts

  • “/sc-skill”

Requirements

  • A Bash shell

Workflow steps

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

  1. Normalize window size and position
  2. Capture one screenshot (auto-select tool)
  3. Run a manifest batch

What it can do on your machine

Read from SKILL.md and the folder at commit b789596. 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 3 files in scripts/ (Shell), which the agent can run.

    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

Sc Skill loads about 884 tokens when it runs, and up to ~2k if it reads all its reference files. Until then it costs about 71 tokens; SKILL.md has 320 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~71
When it runs · the whole SKILL.md, loaded when a task matches
~884
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2k

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); the scripts in this folder are not scanned.

SKILL.md

The full file from jazzyalex/agent-sessions at commit b789596, republished under its MIT licence (© jazzyalex). 320 words, ~884 tokens.

Download SKILL.mdSave it as .claude/skills/sc-skill/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.
name
sc-skill
description
Capture deterministic macOS screenshots for testing, docs, release notes, and marketing assets. Use when asked to automate app screenshots, batch-generate screenshot sets, standardize window sizing/composition, or choose between Peekaboo and native macOS screenshot tooling.

SC Skill

Overview

Use this skill to produce repeatable screenshots for two modes:

  • testing: stable evidence screenshots for QA/regression workflows.
  • marketing: polished, consistently framed screenshots for docs/site/release assets.

This skill is macOS-first and uses Peekaboo as primary automation with native screencapture fallback.

Quick Start

  1. Normalize window size and position:
bash
skills/sc-skill/scripts/sc_window_preset.sh --app "AgentSessions" --preset marketing
  1. Capture one screenshot (auto-select tool):
bash
skills/sc-skill/scripts/sc_capture.sh \
  --app "AgentSessions" \
  --mode marketing \
  --delay 0.25 \
  --max-edge auto \
  --window-preset auto \
  --output artifacts/screenshots/agent-sessions-main.png
  1. Run a manifest batch:
bash
skills/sc-skill/scripts/sc_capture_suite.sh \
  --manifest skills/sc-skill/references/examples/agent-sessions.tsv \
  --outdir artifacts/screenshots

Workflow

  1. Choose mode:
  • testing: prioritize determinism and speed.
  • marketing: prioritize composition consistency.
  1. Choose tool:
  • Start with --tool auto (defaults to Peekaboo when available and permitted).
  • Use --tool native when you need zero external dependency and simple window-region capture.
  1. Enforce layout before capture:
  • Always run sc_window_preset.sh first.
  • Use consistent presets across runs to reduce visual drift.
  1. Capture and archive:
  • Save to artifacts/screenshots/....
  • Sidecar metadata (.json) is opt-in via --metadata; default runs keep artifacts cleaner.
  • Default output uses mode-based max edge (--max-edge auto): testing=1800, marketing=2560, optimized/compressed for sharing/upload.
  • AgentSessions windows are normalized to a realistic working preset before capture (mode-based testing/marketing) to avoid distorted/compressed UI composition.
  • Single capture closes the target app window by default (--no-close-window to keep it open).
  • Suite runs close captured app windows after all requested screenshots by default (--no-close-after-suite to keep them open).
  • For AgentSessions, transcript readiness retry includes a built-in selection nudge (key down + 0.5s pause) to force transcript loading before capture.
  • Default transcript readiness remains fast-fail if loading still does not occur after nudge attempts.
  • If transcript readiness times out, capture fails fast by default; pass --allow-blank-transcript only when blank transcript output is acceptable.

Guardrails

  • Never run captures from XCTest-driven launches when validating user-visible UI behavior; use a normal app launch.
  • Keep screenshot naming stable and descriptive (screen-purpose-state.png).
  • Avoid manual resize/drag between shots; use presets.
  • For multi-shot runs, use the suite manifest instead of ad-hoc commands.

Resources

  • scripts/sc_window_preset.sh: deterministic window sizing/placement.
  • scripts/sc_capture.sh: single-shot capture with Peekaboo/native fallback.
  • scripts/sc_capture_suite.sh: manifest-driven batch capture.
  • references/tool-matrix.md: tooling decision matrix and tradeoffs.
  • references/workflow-checklist.md: repeatable QA/marketing checklist.

© jazzyalex, 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 7 other files (scripts, references) in skills/sc-skill of jazzyalex/agent-sessions.

  • SKILL.md
  • agents/openai.yaml
  • references/examples/agent-sessions.tsv
  • references/tool-matrix.md
  • references/workflow-checklist.md
  • scripts/sc_capture.sh
  • scripts/sc_capture_suite.sh
  • scripts/sc_window_preset.sh

Open the folder on GitHubat commit b789596

Compare with similar skills

Sc Skill 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.

Sc Skill compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Sc Skill this skilljazzyalex/agent-sessions894—~884Automated safety check: PassMIT
Mole CLI Release Flowtw93/Mole70k—~2.6kAutomated safety check: PassGPL-3.0
Releaseeugene1g/agent-safehouse2.1k—~3.5kAutomated safety check: PassApache-2.0
Pulse Releasequnqin24/Pulse517—~1.3kAutomated safety check: PassApache-2.0
Releaseddalcu/mlx-serve1.8k—~1.8kAutomated safety check: PassCustom licence
Megaphone ReleaseKuberwastaken/megaphone170—~1.3kAutomated safety check: PassMIT

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More from jazzyalex/agent-sessions

All 8 skills in this repo

  • Add Agent Support

    jazzyalex/agent-sessions

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  • Deploy

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  • Deploy Agent Sessions

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  • Release Notes

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  • Agent Support Matrix

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  • Agent Session Format Check

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Works with

Categories

Questions about Sc Skill

What does Sc Skill do?

Capture deterministic macOS screenshots for testing, docs, release notes, and marketing assets. Sc Skill is an agent skill from jazzyalex/agent-sessions. Capture deterministic macOS screenshots for testing, docs, release notes, and marketing assets.

When should I use Sc Skill?

Sc Skill fits situations like: asked to automate app screenshots; batch-generate screenshot sets; standardize window sizing/composition; choose between Peekaboo and native macOS screenshot tooling.

How do I install Sc Skill in Claude Code?

Run `npx skills add jazzyalex/agent-sessions --skill sc-skill -a claude-code`. Or copy the skill folder (skills/sc-skill in jazzyalex/agent-sessions) into .claude/skills/sc-skill in your project. Claude Code loads it when a task matches its description.

How do I install Sc Skill in Codex?

Run `npx skills add jazzyalex/agent-sessions --skill sc-skill -a codex`. Or copy the skill folder (skills/sc-skill in jazzyalex/agent-sessions) into .agents/skills/sc-skill in your project. Codex loads it when a task matches its description.

Can I use Sc Skill 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 jazzyalex/agent-sessions --skill sc-skill -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sc-skill, .gemini/skills/sc-skill, .github/skills/sc-skill and .opencode/skills/sc-skill in your project.

What does Sc Skill need to run?

Going by SKILL.md and its folder, Sc Skill needs a shell for the scripts in its folder. Our summary lists: A Bash shell.

Does Sc Skill 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 Sc Skill 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Sc Skill use?

Sc Skill 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 Sc Skill use?

About 884 tokens (SKILL.md is roughly 3.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.1k tokens, read only when the agent opens those files.

What are the alternatives to Sc Skill?

Skills that share tags, products or a category with Sc Skill: Mole CLI Release Flow (tw93/Mole, 70k stars), Release (eugene1g/agent-safehouse, 2.1k stars), Pulse Release (qunqin24/Pulse, 517 stars) and Release (ddalcu/mlx-serve, 1.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sc Skill?

jazzyalex (a GitHub user) maintains it in jazzyalex/agent-sessions, which has 894 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on October 9, 2026.

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