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 synthesisengineering/synthesis-skills --skill synthesis-absence-coordinationgit clone --depth 1 https://github.com/synthesisengineering/synthesis-skillsWrote 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/synthesisengineering/synthesis-skills/synthesis-absence-coordination)<a href="https://agentmods.dev/skills/synthesisengineering/synthesis-skills/synthesis-absence-coordination"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-absence-coordination/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/synthesisengineering/synthesis-skills/synthesis-absence-coordination"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-absence-coordination.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 | $0.00165 | $0.03963 |
| Opus 5 | $0.00082 | $0.01982 |
| Sonnet 5 | $0.00033 | $0.00793 |
| Haiku 4.5 | $0.00016 | $0.00396 |
Grade A, and why
synthesis-absence-coordination 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.
How it starts
The opening of the file, as written. The whole thing — 354 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Absence Coordination
Version 1.0.0 (2026-08-12)
An absence is a handoff, not an announcement
Most "out of office" tooling answers one question: is this person away? That is the least useful question anyone has.
The questions people actually have are: who decides in their place, what can wait, and can I reach them if it truly cannot. An absence notice that omits those does not remove a blocker — it relocates it, from your calendar into someone else's inbox, where it sits until you get back and discover a week of stalled decisions.
This skill treats an absence as a handoff with a scheduled reversal. Every protocol below follows from that.
It also treats an absence as a relationship event. Who hears first, who hears what, and who never hears at all are not implementation details. They are the whole thing.
Configuration contract
All specifics — names, addresses, tiers, channels, lead times, group IDs — live in a private config the skill reads at load time:
~/.synthesis/absence-coordination/config.yaml
The skill is generic and publishable; the config is neither. Full schema:
references/config-schema.md. Starting point:
example-config.yaml. Per-tier draft skeletons:
references/message-templates.md. Fifteen-minute
adoption path: references/quickstart.md. Validate with:
python3 validate_config.py ~/.synthesis/absence-coordination/config.yaml
If the config is missing, STOP and say so. Announcing an absence without knowing the tier order is not a partial success; it is the specific failure this skill exists to prevent. Never hardcode a name, address, or channel that belongs in config.
Shared config. Where synthesis-chief-of-staff is installed, this skill reads its
preferences file for calendar accounts, assistant relationships, and travel-disclosure
rules rather than duplicating them. One fact, one home. If both files define the same
fact, the chief-of-staff config wins and this skill's copy is a bug.
What ships with it
7 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 · 354 lines · 165 tokens per session scan A 95cd881b5230
synthesis-absence-coordination is a skill published in the GitHub repository synthesisengineering/synthesis-skills (19 stars, last pushed today), licensed Apache-2.0. It adds 165 tokens to every session and 3,963 once invoked, about $0.0008 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 2026-08-30.
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