Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add tercumantanumut/selene --skill screenshotgit clone --depth 1 https://github.com/tercumantanumut/seleneWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/tercumantanumut/selene/screenshot)<a href="https://agentmods.dev/skills/tercumantanumut/selene/screenshot"><img src="https://agentmods.dev/badge/skills/tercumantanumut/selene/screenshot/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/tercumantanumut/selene/screenshot"><img src="https://agentmods.dev/badge/skills/tercumantanumut/selene/screenshot.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00045 | $0.01966 |
| Opus 5 | $0.00023 | $0.00983 |
| Sonnet 5 | $0.00009 | $0.00393 |
| Haiku 4.5 | $0.00005 | $0.00197 |
Grade A, and why
screenshot scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
98% identical to screenshot — 50 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 268 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Screenshot Capture
Follow these save-location rules every time:
- If the user specifies a path, save there.
- If the user asks for a screenshot without a path, save to the OS default screenshot location.
- If Codex needs a screenshot for its own inspection, save to the temp directory.
Tool priority
- Prefer tool-specific screenshot capabilities when available (for example: a Figma MCP/skill for Figma files, or Playwright/agent-browser tools for browsers and Electron apps).
- Use this skill when explicitly asked, for whole-system desktop captures, or when a tool-specific capture cannot get what you need.
- Otherwise, treat this skill as the default for desktop apps without a better-integrated capture tool.
macOS permission preflight (reduce repeated prompts)
On macOS, run the preflight helper once before window/app capture. It checks Screen Recording permission, explains why it is needed, and requests it in one place.
The helpers route Swift's module cache to $TMPDIR/codex-swift-module-cache
to avoid extra sandbox module-cache prompts.
bash ${SELENE_SKILL_ROOT}/scripts/ensure_macos_permissions.sh
To avoid multiple sandbox approval prompts, combine preflight + capture in one command when possible:
bash ${SELENE_SKILL_ROOT}/scripts/ensure_macos_permissions.sh && \
python3 ${SELENE_SKILL_ROOT}/scripts/take_screenshot.py --app "Codex"
For Codex inspection runs, keep the output in temp:
bash ${SELENE_SKILL_ROOT}/scripts/ensure_macos_permissions.sh && \
python3 ${SELENE_SKILL_ROOT}/scripts/take_screenshot.py --app "<App>" --mode temp
Use the bundled scripts to avoid re-deriving OS-specific commands.
macOS and Linux (Python helper)
Run the helper from the repo root:
python3 ${SELENE_SKILL_ROOT}/scripts/take_screenshot.py
Common patterns:
- Default location (user asked for "a screenshot"):
python3 ${SELENE_SKILL_ROOT}/scripts/take_screenshot.py
- Temp location (Codex visual check):
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 268 lines · 45 tokens per session scan A ad6f21849620
screenshot is a skill published in the GitHub repository tercumantanumut/selene (168 stars, last pushed 1mo ago), licensed MIT. It adds 45 tokens to every session and 1,966 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to screenshot, differing in 50 lines, and is treated as a copy.
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