Primary

Primary (Primary Kids, Inc.) is a direct-to-consumer children's apparel brand selling simple, slogan-free, mix-and-match clothing "in all colors, for all kids" — babies through age 14, plus adult sizes, swimwear, school uniforms and licensed Sesame Street collaborations. The company operates a Shopify-hosted online store at primary.com and is a portfolio company of Homebrew. Primary has no first-party developer API, but its storefront is agent-accessible: it serves a live hosted Shopify Storefront MCP server (catalog search, product lookup, cart, checkout, policy/FAQ lookup) and exposes Shopify's Customer Account API (OAuth2/OIDC) for customer-scoped operations, along with a published llms.txt agent-instructions document.

Primary is profiled on the APIs.io network. Tagged areas include Company, Consumer, Retail, E-Commerce, and Apparel.

Primary’s developer surface includes engineering blog, authentication, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

12.6/100 emerging ▬ flat Agent 13/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs 1 MCP Servers

Company Consumer Retail E-Commerce Apparel Children Shopify Agents

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 12.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 5.0 / 9

Regulatory Posture 4.0 / 15

Agent readiness — 13/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 14.3 — up to +17.1 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/primary/apis.yml: open an issue on github.com/api-evangelist/primary to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Fashion & Apparel (apparel, footwear, textiles)	regulated	42.8 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (platform)

Universal Commerce Protocol (UCP)

measured — observed by APIs.io (shopify)

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Primary Shopify Storefront MCP

Remote MCP server at www.primary.com over HTTP; 5 tools listed.

MCP SERVER

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Primary Authentication

oauth2/openIdConnect · 1 scheme

SECURITY

Primary Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Primary Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Company 3

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

Website

Website

Source (apis.yml)

aid: primary
name: Primary
description: 'Primary (Primary Kids, Inc.) is a direct-to-consumer children''s apparel brand selling simple, slogan-free,
  mix-and-match clothing "in all colors, for all kids" — babies through age 14, plus adult sizes, swimwear, school uniforms
  and licensed Sesame Street collaborations. The company operates a Shopify-hosted online store at primary.com and is a portfolio
  company of Homebrew. Primary has no first-party developer API, but its storefront is agent-accessible: it serves a live
  hosted Shopify Storefront MCP server (catalog search, product lookup, cart, checkout, policy/FAQ lookup) and exposes Shopify''s
  Customer Account API (OAuth2/OIDC) for customer-scoped operations, along with a published llms.txt agent-instructions document.'
url: https://raw.githubusercontent.com/api-evangelist/primary/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- homebrew
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Consumer
- Retail
- E-Commerce
- Apparel
- Children
- Shopify
- Agents
tags_raw:
- Company
- Consumer
- Retail
- Ecommerce
- Apparel
- Children
- Shopify
- Agent
image: https://www.primary.com/favicon.ico
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.primary.com/blogs/using-our-words
  type: Blog
- url: https://www.primary.com/blogs/using-our-words.atom
  type: BlogRSS
- type: Website
  url: https://www.primary.com
- type: MCPServer
  name: Primary Shopify Storefront MCP
  url: mcp/primary-mcp.yml
- type: LLMsTxt
  url: llms/primary-llms.txt
- type: WellKnown
  url: well-known/primary-well-known.yml
- type: Authentication
  url: authentication/primary-authentication.yml
- type: OAuthScopes
  url: scopes/primary-scopes.yml
- type: Conformance
  url: conformance/primary-conformance.yml
- type: DomainSecurity
  url: security/primary-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 9
  pass: local-v1

Primary API — frequently asked questions

How do I authenticate with the Primary API?

Primary documents its authentication (oauth2/openIdConnect · 1 scheme). The details are profiled on APIs.io as Primary Authentication.

Does Primary have an MCP server?

Yes. APIs.io lists 1 MCP server for Primary: Remote MCP server at www.primary.com over HTTP; 5 tools listed.

Is the Primary API ready for AI agents?

Primary has a Kin Score of 12.6 out of 100 (emerging) and an Agent Readiness score of 12.9 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

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