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 structural-physicsgit 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/structural-physics)<a href="https://agentmods.dev/skills/bbeierle12/skill-mcp-claude/structural-physics"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/structural-physics/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/structural-physics"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/structural-physics.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 | $0.00052 | $0.00394 |
| Opus 5 | $0.00026 | $0.00197 |
| Sonnet 5 | $0.00010 | $0.00079 |
| Haiku 4.5 | $0.00005 | $0.00039 |
Grade A, and why
structural-physics 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.
What it actually says
Structural Physics
Stability validation and damage systems for building mechanics.
Quick Start
import { HeuristicValidator } from './scripts/heuristic-validator.js';
import { DamageSystem } from './scripts/damage-propagation.js';
// Rust/Valheim style stability
const validator = new HeuristicValidator({ mode: 'heuristic' });
validator.addPiece(piece);
const result = validator.validatePlacement(newPiece);
// result: { valid: true, stability: 0.85, supports: [...] }
// Damage and collapse
const damage = new DamageSystem(validator);
damage.applyDamage(piece, 50, 'physical');
damage.applyExplosiveDamage(position, 100, 10); // radius damage
Reference
See references/structural-physics-advanced.md for:
- Physics mode comparison (arcade vs heuristic vs realistic)
- Material properties and decay rates
- Damage state thresholds
- Cascade mechanics
Scripts
scripts/heuristic-validator.js- Fast validation (Fortnite/Rust/Valheim modes)scripts/stability-optimizer.js- Caching and batch updates for large structuresscripts/damage-propagation.js- Damage states, fire spread, cascading collapsescripts/physics-engine-lite.js- Optional realistic stress/strain simulation
Physics Modes
- Arcade (Fortnite): Connectivity only, instant collapse, best for combat
- Heuristic (Rust/Valheim): Stability %, predictable rules, best for survival
- Realistic: Full stress/strain, computationally expensive, best for engineering sims
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.
- 9d ago First seen · 48 lines · 52 tokens per session scan A 6df7403d369d
structural-physics is a skill published in the GitHub repository Bbeierle12/Skill-MCP-Claude (8 stars, last pushed yesterday), licensed MIT. It adds 52 tokens to every session and 394 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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