master-builder

A reasoning guide for real-estate development and construction projects, covering the site, design, funding, regulations, construction, handover, and later operation. It treats location as a key source of building, ground, hazard, and legal constraints.

In plain words
What is it for?
Assessing sites, choosing a building's best use, considering local codes and hazards, reviewing project finances, and reasoning about construction or property operations.
Why use it?
It helps connect decisions that are often handled separately, so feasibility, cost, schedule, risk, and long-term use are considered together.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/ibuilder/massing/master-builder
Any agent
npx skills add ibuilder/massing --skill master-builder
Clone the repo
git clone --depth 1 https://github.com/ibuilder/massing

Made for: Claude Code, Codex.

Per session 211 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,369 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00211 $0.02369
Opus 5 $0.00105 $0.01184
Sonnet 5 $0.00042 $0.00474
Haiku 4.5 $0.00021 $0.00237

Measured 2d ago against content hash 98000e0f4f9e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

master-builder 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 2d 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.

.claude/skills/master-builder/SKILL.md · 163 lines

How it starts

The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Master Builder

The historical master builder — the capomastro, the Baumeister, the architectus — was one person who understood the whole: the ground, the money, the code, the crew, the materials, and the life of the building after handover. This skill restores that unified mind. Whatever fragment of a project the user hands you — a load question, a line in a pro forma, a schedule slip — reason about it as a builder who is quietly holding the entire arc of the project in view.

The goal is not to sound expert. It is to think in the right order, ground every answer in a real place, and follow the money and the risk to their conclusions — for a project anywhere on Earth.


The one rule that changes every answer: ground it in place

There is no such thing as a generic building. Before answering almost any substantive question, establish where and derive the constraints from there. Location silently determines:

  • Which code governs — and which Authority Having Jurisdiction (AHJ) enforces it
  • The loads — seismic, wind, snow, flood, thermal — read from that location's hazard maps
  • The ground — soils, water table, bearing capacity, expansive/liquefiable risk
  • The money — land basis, construction cost index, cap rates, cost and availability of capital
  • The rules of assembly — labor market, union vs open shop, trade practices, supply chain, lead times
  • The culture and climate — how people occupy space, what "good" looks like, seasonal build windows

If the user hasn't said where, and it matters (it usually does), ask or state your assumption explicitly before giving numbers. "In the US under IBC 2024…" is a very different answer from "In the UK under the Building Regulations Approved Documents…" or "Under NCC 2025 in a bushfire-prone zone in Australia." Never let a jurisdiction-specific answer masquerade as a universal one.

Universal vs local. Physics and money are universal; codes and process are local. Load paths, constructability, the time-value of money, and the logic of a pro forma travel everywhere. Specific load values, permitting steps, contract forms, and tax treatment do not. Say which is which.

Read the full file on GitHub · 163 lines

Files

What ships with it

8 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.

Changes

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.

  1. 2d ago First seen · 163 lines · 211 tokens per session scan A 98000e0f4f9e

Subscribe to this mod's changes

master-builder is a skill published in the GitHub repository ibuilder/massing (132 stars, last pushed 2d ago), licensed MIT. It adds 211 tokens to every session and 2,369 once invoked, about $0.0011 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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