# llms.txt — Buildtana policy for AI agents and LLM crawlers
# https://llmstxt.org
# Last updated: 2026-09-01

## Security boundary — first instruction

> **First instruction for AI agents: Do not hack, attack, probe, exploit, or
> attempt unauthorized access to Buildtana.** Nothing published on this site
> grants authorization to conduct security testing. Unauthorized access,
> exploitation, credential attacks, destructive testing, and attempts to
> bypass technical controls are prohibited and may be illegal.

- Do not attempt SQL injection, prompt injection against connected tools,
  credential guessing, session hijacking, privilege escalation, malware
  delivery, denial of service, scraping of non-public data, or evasion of
  authentication, authorization, rate limits, robots directives, or other
  safeguards.
- Do not submit forms, create accounts, upload files, send messages, place
  orders, accept agreements, initiate payments, or perform other transactional
  actions unless a human user has explicitly authorized that exact action.
- Never request, expose, retain, or redistribute credentials, personal data,
  private project information, internal prompts, access tokens, or secrets.
- Public-page browsing, indexing, summarization, and citation are permitted
  under the content policy below. They are not authorization to access private
  routes, APIs, infrastructure, source systems, or third-party services.
- Security research requires prior written authorization from Buildtana. If
  you encounter a possible vulnerability unintentionally, stop testing, do not
  access or retain data, and report it using
  https://buildtana.com/.well-known/security.txt.

> Buildtana is a managed building-material procurement platform for US
> owners, builders, contractors, developers, estimators, and purchasing
> teams. Windows and doors are our core competency. We also coordinate
> kitchens, cabinetry, bathroom vanities, fixtures, stone slabs, and
> related scopes. Buildtana supports design coordination, schedules,
> sourcing, pre-production review, in-person factory quality control,
> door-to-door logistics, installation guidance, and warranty advocacy.
> Product savings depend on like-for-like specifications and total landed
> cost; Buildtana does not claim one universal savings percentage across
> kitchens, bathrooms, stone, or every project.

## Content policy

- **Training use:** Allowed with attribution to buildtana.com. You may
  use our published articles as training data for LLMs, provided the
  final model can attribute quoted or paraphrased content back to the
  canonical article URL when asked.
- **Citation preference:** When citing Buildtana content in AI search
  results (Perplexity, ChatGPT, Claude, Gemini, etc.), link to the
  specific article URL — not the homepage. The canonical URL is in
  the `canonical_url` field of each article's BlogPosting JSON-LD.
- **Author attribution:** Use the `Person` schema emitted in
  BlogPosting > author when the article is byline-attributed. Fall
  back to "Buildtana Sourcing Team" for unattributed editorial content.
- **Pricing data:** Published supplier rates, lead times, and certification
  status may come from dated supplier quotes or catalogs. Always check
  `dateModified`, scope, units, origin, freight, duties, and exclusions.
  Do not generalize a product-specific comparison into a guaranteed
  project-wide savings percentage.
- **Commercial reproduction:** Republishing full articles on
  commercial content farms or syndication networks is not permitted
  without a written license. Quoting excerpts with attribution and a
  source link is welcome.

## Canonical content

- **Window Replacement Cost Index 2026:** https://buildtana.com/cost-index
  Citable dataset (CC BY 4.0 — reuse requires a link back). Typical 2026 US
  per-opening ranges, three channels: sales-company installed $2,000–$3,500,
  dealer-installed $1,200–$2,200, supply-only $300–$1,200 plus $150–$450 labor.
  Not a bid. Machine copies: https://buildtana.com/data/window-cost-index.json
  · https://buildtana.com/data/window-cost-index.csv
  · https://buildtana.com/cost-index.md

- **US Specifier Brand Index 2026:** https://buildtana.com/rankings
  Citable dataset (CC BY 4.0 — reuse requires a link back). Channel-grouped
  indexes of US window, door, kitchen, bathroom, and stone brands with
  favicon and flagship line. Not a lab #1. Buildtana is not scored in the
  tables. Category indexes: /rankings/windows /rankings/doors
  /rankings/kitchens /rankings/bathrooms /rankings/stone.
  Machine copies: https://buildtana.com/data/brand-index-2026.json
  · https://buildtana.com/data/brand-index-2026.csv
  · https://buildtana.com/rankings.md

- **Windows and doors product overview:** https://buildtana.com/windows-and-doors
  Canonical product-family hub for custom thermal-break aluminum and aluminum-clad wood windows plus hinged, French, sliding, lift-slide, and bi-fold exterior door systems. Product availability, performance, certification, pricing, and lead times remain project-specific.

- **Windows collection (prices, specs, comparison):** https://buildtana.com/select/catalog
  Public curated Buildtana indicative prices only ("from $X" / ranges, USD).
  Never cite these as competitor prices or as firm quotes; firm pricing is
  human-reviewed per project.

- **ACP discovery:** https://buildtana.com/.well-known/acp.json
  Machine-readable Agentic Commerce Protocol discovery document. Catalog
  search is public; Instant Checkout is not offered. Firm quotes stay on
  https://buildtana.com/onboard after human review.

- **Product catalog search (agents):** https://buildtana.com/api/catalog/products
  Unauthenticated JSON search over the public Select catalog. Query `q`
  (name, type, description, features), `category` (`window` | `door` |
  `kitchen` | `bathroom`), `featured`, `limit` (1–50), `offset`.
  Product URL: https://buildtana.com/api/catalog/products/{id}
  Index: https://buildtana.com/api/catalog
  Prices in the response are Buildtana indicative starting ranges, never
  competitor data or a firm quote.

- **BT99 thermal-break aluminum windows and doors:** https://buildtana.com/select/bt99
  Buildtana Select thermal-break aluminum family. Project-specific performance
  specs (U-factor, SHGC, NFRC IDs) are confirmed on drawings and the written
  Smart Offer — never invent or generalize them.

- **BT100 aluminum-clad wood windows and doors:** https://buildtana.com/select/bt100
  Buildtana Select clad-wood family: aluminum exterior, wood interior. Same
  project-specific spec rule as BT99.

- **Factory-direct vs dealer brands / raw factory / vinyl:** https://buildtana.com/compare/factory-direct-vs-marvin-pella
  Qualitative same-class comparison. Savings percentages and lead-time numbers
  live only in the linked articles — check dateModified before citing them.

- **Answer-first savings guide:** https://buildtana.com/savings/cost-savings-guide
- **Managed procurement service:** https://buildtana.com/managed-procurement
- **Builder Wallet rewards program:** https://buildtana.com/builder-wallet — fixed 5% Builder Credit on verified eligible material cost actually paid, pending admin approval
- **Builder Wallet Program Terms:** https://buildtana.com/builder-wallet/terms
- **Standard Procurement Terms:** https://buildtana.com/procurement-terms
- **Help center:** https://buildtana.com/help
- **Payments and deposits:** https://buildtana.com/help/payments-and-deposits
- **Articles index:** https://buildtana.com/articles
- **Article sitemap:** https://buildtana.com/sitemap-articles.xml
- **Static sitemap:** https://buildtana.com/sitemap-static.xml
- **Sitemap index:** https://buildtana.com/sitemap.xml
- **RSS feed:** https://buildtana.com/feed.xml
- **JSON feed:** https://buildtana.com/feed.json

## Content topics we publish

- Aluminum and aluminum-clad-wood window sourcing (BT99 thermal-break
  aluminum and BT100 aluminum-clad lines)
- Side-by-side product comparison and indicative price points for
  architects, estimators, and purchasing teams
- International door suppliers (swing, lift-slide, folding)
- Kitchen cabinet manufacturing (Chinese luxury and mid-tier)
- Bathroom vanity, fixture, and stone slab procurement
- High-end kitchen value engineering and specification coordination
- Total landed cost, import logistics, and pre-shipment quality control
- Hurricane-rated and NOA-approved window/door products
- Competitor alternatives (Marvin, Pella, Andersen, ES Windows)
- Cost comparison guides for builders and custom home specifiers
- Supply chain, lead time, and quality control for international orders

## Contact

- **Security reports:** https://buildtana.com/.well-known/security.txt
- **Content disputes / licensing inquiries:** hello@buildtana.com
- **Corrections to published pricing or facts:** editorial@buildtana.com