Borrowing it
Nothing to install: this file belongs to BariBariGood/manzanas. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/BariBariGood/manzanas/main/.agents/skills/park-thaw-semantics/SKILL.mdgit clone --depth 1 https://github.com/BariBariGood/manzanasWrote 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/baribarigood/manzanas/park-thaw-semantics)<a href="https://agentmods.dev/skills/baribarigood/manzanas/park-thaw-semantics"><img src="https://agentmods.dev/badge/skills/baribarigood/manzanas/park-thaw-semantics/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/baribarigood/manzanas/park-thaw-semantics"><img src="https://agentmods.dev/badge/skills/baribarigood/manzanas/park-thaw-semantics.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 | $0.00070 | $0.00681 |
| Opus 5 | $0.00035 | $0.00341 |
| Sonnet 5 | $0.00014 | $0.00136 |
| Haiku 4.5 | $0.00007 | $0.00068 |
Grade A, and why
park-thaw-semantics 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 11d 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 — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Park/thaw semantics
The warm pool (internal/warm) keeps pool sims booted+slimmed but PARKED:
the whole process tree from launchd_sim down is SIGSTOPped, so an idle warm
sim costs ~0 CPU. On lease grant the tree is SIGCONTed (thawed) using the PID
list cached at park time (~25ms Apple Silicon / ~225ms Intel). On
release+reset the sim is erased, re-booted, and parked again.
Hard invariants — violating these wedges the host
- ALWAYS thaw before shutdown.
xcrun simctl shutdownon a parked sim wedges for ~34s. The daemon does this for you; neversimctl shutdowna pool sim by hand. - Never route actions at a parked sim. While parked, AXe fails and
simctl spawnhangs. The daemon thaws on lease grant — acquire a lease instead of poking the sim directly. - Never SIGKILL a parked tree. If a parked sim looks stuck, restart via
the daemon (it thaws everything on shutdown —
ThawAll— so trees are never left stopped behind a dead daemon). - Double STOP / double CONT are harmless; Park/Thaw are idempotent.
How to recognize a parked sim
xcrun simctl list devicesshows itBootedbut it responds to nothing.ps -axww -o pid,ppid,state,command | grep <UDID>shows stateT(stopped) on the tree.
If you find a stopped tree and the daemon is NOT running (crashed without
cleanup): kill -CONT each PID of the tree, then simctl shutdown. Only do
this when you have verified no daemon owns the sim.
Related machinery (same package)
- Footprint watchdog: sweeps pool sims (default every 1m); a sim whose
tree phys_footprint exceeds
--pool-footprint-cap-mb(default 3 GiB) is recycled (erase→boot→park). Footprint is measured with/usr/bin/footprint(kernel phys_footprint) — summing ps RSS overcounts ~8x on sim trees. - Orphan reaper: kills leftover
launchd_simtrees the daemon itself parked earlier (ownership ledger keyed by PID+command, never a recycled PID). It does not touch trees it never owned. - Quarantine: if a post-lease reset fails or hangs (>10 min bound), the
target is quarantined rather than handed out dirty. Clear with
POST /v0/targets/{udid}/clear-quarantineafter fixing the cause.
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.
- 11d ago First seen · 49 lines · 70 tokens per session scan A 676be73d4545
park-thaw-semantics is a skill published in the GitHub repository BariBariGood/manzanas (20 stars, last pushed 9d ago), licensed Apache-2.0. It adds 70 tokens to every session and 681 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 2026-08-30.
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