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 building-routergit 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/building-router)<a href="https://agentmods.dev/skills/bbeierle12/skill-mcp-claude/building-router"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/building-router/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/building-router"><img src="https://agentmods.dev/badge/skills/bbeierle12/skill-mcp-claude/building-router.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 | $0.00069 | $0.00977 |
| Opus 5.5 | $0.00028 | $0.00391 |
| Sonnet 5.5 | $0.00014 | $0.00195 |
| Haiku 4.5 | $0.00007 | $0.00098 |
Grade A, and why
building-router 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 1mo 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 — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Building Mechanics Router
Routes to 9 specialized skills based on game requirements.
Routing Protocol
- Classify — Single/multiplayer + scale + core features
- Match — Apply signal matching rules below
- Combine — Most games need 3-5 skills together
- Load — Read matched SKILL.md files before implementation
Quick Route
Tier 1: Core Mechanics
| Need | Skill | Signals |
|---|---|---|
| Spatial queries, collision | performance-at-scale |
slow, lag, optimize, spatial, collision, thousands |
| Stability, damage, collapse | structural-physics |
stability, collapse, support, damage, Fortnite, Rust, Valheim |
| Network sync, prediction | multiplayer-building |
network, multiplayer, sync, server, latency, authoritative |
Tier 2: Enhanced Features
| Need | Skill | Signals |
|---|---|---|
| Slopes, foundations, anchoring | terrain-integration |
slope, terrain, foundation, ground, pillar, heightmap |
| Timer decay, Tool Cupboard | decay-upkeep |
decay, upkeep, maintenance, tool cupboard, abandoned |
| Blueprints, undo/redo, preview | builder-ux |
blueprint, prefab, undo, redo, ghost, preview, selection |
Tier 3: Platform & Reference
| Need | Skill | Signals |
|---|---|---|
| Touch, VR, accessibility | platform-building |
mobile, touch, VR, hand tracking, colorblind |
| Design analysis, trade-offs | case-studies-reference |
how does Fortnite/Rust do, compare games, trade-offs |
Signal Priority
When multiple signals present:
- Multiplayer explicit →
multiplayer-buildingrequired - Scale indicator → >1000 pieces triggers
performance-at-scale - Persistence → Long-running servers trigger
decay-upkeep - Platform constraint → Mobile/VR triggers
platform-building - Default →
structural-physicsalways relevant for building games
Common Combinations
Full Survival (Rust-style, 6 skills)
performance-at-scale → spatial indexing
structural-physics → stability + damage
multiplayer-building → networking
terrain-integration → foundations on slopes
decay-upkeep → Tool Cupboard + upkeep
builder-ux → blueprints + undo
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.
- 1mo ago First seen · 111 lines · 69 tokens per session scan A d1cf4d824fed
building-router is a skill published in the GitHub repository Bbeierle12/Skill-MCP-Claude (9 stars, last pushed yesterday), licensed MIT. It adds 69 tokens to every session and 977 once invoked, about $0.0003 per session on Opus 5.5. 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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