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 Bbeierle12/Skill-MCP-Claude --skill decay-upkeepgit clone --depth 1 https://github.com/Bbeierle12/Skill-MCP-ClaudeWrote 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/bbeierle12/skill-mcp-claude/decay-upkeep)<a href="https://agentmods.dev/skills/bbeierle12/skill-mcp-claude/decay-upkeep"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/decay-upkeep/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/bbeierle12/skill-mcp-claude/decay-upkeep"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/decay-upkeep.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 | $0.00050 | $0.00486 |
| Opus 5 | $0.00025 | $0.00243 |
| Sonnet 5 | $0.00010 | $0.00097 |
| Haiku 4.5 | $0.00005 | $0.00049 |
Grade A, and why
decay-upkeep 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 10d 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.
What it actually says
Decay & Upkeep
Timer-based building decay and resource-based upkeep for survival games.
Quick Start
import { DecayManager } from './scripts/decay-manager.js';
import { UpkeepSystem } from './scripts/upkeep-system.js';
import { ToolCupboard } from './scripts/tool-cupboard.js';
// Decay without protection
const decay = new DecayManager({
mode: 'rust',
decayMultiplier: 1.0
});
decay.addPiece(piece);
decay.tick(deltaTime); // Called every frame/tick
// Tool Cupboard protection
const tc = new ToolCupboard({
radius: 30,
upkeepCost: { wood: 100, stone: 50 }
});
tc.setPosition(position);
tc.depositResources({ wood: 500, stone: 250 });
// Protected pieces won't decay while upkeep is paid
Reference
See references/decay-upkeep-advanced.md for:
- Decay rate formulas by material
- Tool Cupboard mechanics (Rust pattern)
- Upkeep scaling with base size
- Server performance benefits
- Anti-raid delay mechanics
Scripts
scripts/decay-manager.js- Tick-based decay, material rates, damage statesscripts/upkeep-system.js- Resource drain, calculation, UI datascripts/tool-cupboard.js- Protection radius, authorization, resource storagescripts/cleanup-scheduler.js- Server-side cleanup of abandoned structures
Decay Modes
- Rust: Linear decay over 8-24 hours (material dependent), prevented by Tool Cupboard
- ARK: Slower decay (days to weeks), tribe-based protection
- Minecraft: No decay (creative/survival), optional via mods
Design Philosophy
Decay serves dual purposes in survival games: gameplay balance (prevents infinite hoarding) and server performance (removes abandoned bases). The Tool Cupboard pattern elegantly ties both together—players must actively maintain bases, and inactive players' structures automatically clean up.
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.
- 10d ago First seen · 60 lines · 50 tokens per session scan A 8e94abaab3df
decay-upkeep is a skill published in the GitHub repository Bbeierle12/Skill-MCP-Claude (8 stars, last pushed yesterday), licensed MIT. It adds 50 tokens to every session and 486 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 2026-08-31.
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