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 fanfan-de/anybox --skill google-calendar-free-up-timegit clone --depth 1 https://github.com/fanfan-de/anyboxWrote 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/fanfan-de/anybox/google-calendar-free-up-time)<a href="https://agentmods.dev/skills/fanfan-de/anybox/google-calendar-free-up-time"><img src="https://agentmods.dev/badge/skills/fanfan-de/anybox/google-calendar-free-up-time/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/fanfan-de/anybox/google-calendar-free-up-time"><img src="https://agentmods.dev/badge/skills/fanfan-de/anybox/google-calendar-free-up-time.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00057 | $0.00528 |
| Opus 5 | $0.00028 | $0.00264 |
| Sonnet 5 | $0.00011 | $0.00106 |
| Haiku 4.5 | $0.00006 | $0.00053 |
Grade A, and why
google-calendar-free-up-time 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Google Calendar Free Up Time
Use this skill when the goal is to create time, not just inspect time.
Relevant Actions
- Use
search_eventsto map the day's current fragmentation and identify movable candidates. - Use
read_eventorread_event_all_fieldswhen one candidate meeting needs a closer look before proposing a move. - Use
create_eventwhen the user explicitly wants a temporary hold or focus block once the target slot is grounded. - Use
update_eventonly after the proposal is clear and setupdate_scopetothis_instance,entire_series, orthis_and_followingonce the correct scope of change is grounded.
Workflow
- Start by identifying the target: today, tomorrow, this afternoon, a specific day, or a broader window. If the user already gave a concrete window or duration, work inside it before asking follow-up questions.
- Optimize for contiguous free blocks, not raw free-minute totals.
- Identify which meetings are likely fixed and which are more movable before proposing changes.
- If the user explicitly wants a temporary hold or focus block rather than a reschedule plan, choose the best qualifying free slot and create the hold once the slot is clear.
- Look for the smallest edit set that creates a meaningful uninterrupted block.
- Prefer solutions that reduce fragmentation across the rest of the day, not just one local gap.
- If no clean block exists, show the best partial win and what tradeoff it requires.
Prioritization Heuristics
- Protect hard anchors such as external meetings, major reviews, commute buffers, or lunch if it is already a stable part of the day.
- Move lower-cost meetings first, such as optional events, transparent holds, lightweight internal syncs, or self-created placeholders.
- Favor one or two coherent shifts over a chain of many tiny moves.
- Prefer creating one useful block over scattering a few small openings.
Output Conventions
- Show the before-and-after effect of the proposal.
- Name the block of time created and the minimum meetings that would need to move.
- When creating a hold, state the exact slot and whether the hold is transparent or busy.
- If suggesting multiple options, keep them short and explain the tradeoff for each.
What ships with it
3 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.
- 9d ago First seen · 40 lines · 57 tokens per session scan A 2408991103e9
google-calendar-free-up-time is a skill published in the GitHub repository fanfan-de/anybox (57 stars, last pushed 1mo ago), licensed MIT. It adds 57 tokens to every session and 528 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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