# Klaviyo — API Agent Score

> Score: 67/100 (Grade: C) | Domain: klaviyo.com | Rubric: 1.0.0 | Checked: July 24, 2026

Klaviyo scored 67/100 (C), classified "partially-ready".

[View full report](https://www.postman.com/ai/ai-ready-apis/company/klaviyo)
[All organizations](https://www.postman.com/ai/ai-ready-apis/llms.txt)

## Summary

- Overall: 67/100 (C)
- Classification: partially-ready

## Category Scores

- API Design: 100/100 (A+)
- Developer Experience: 79/100 (B)
- Agent Discovery: 61/100 (C)
- Agent Understanding: 74/100 (B)
- Agent Usability: 43/100 (F)

## Check Results

### API Design

- [pass] Machine-readable, versioned contract — Versioning declared (info.version="2026-07-15") and media-type-versioning detected. Investigated: spec 100%, docs 100%.
- [pass] Schema coverage & depth — 3/3 (100%) public params are fully typed (no any/**kwargs). Analyzer confirms all methods have a derivable input schema. Investigated: sdk 100%, spec 33%.
- [pass] Auth declared & discoverable — Authentication required (global or on every operation). Investigated: spec 100%, docs 100%.
- [pass] Security & governance hygiene — No credential-shaped strings detected in spec. Investigated: spec 100%, wellknown 0%.
- [pass] Example coverage — Code samples present on 1/5 pages across 1 language(s); broader multi-language coverage missing. Investigated: docs 100%, sdk 100%, spec 0%.

### Developer Experience

- [pass] Self-service developer portal — Self-service signup at https://www.klaviyo.com/sign-up; free tier / sandbox documented. Investigated: docs 100%.
- [pass] Code samples in docs — Code samples present on 1/5 pages across 1 language(s); broader multi-language coverage missing. Investigated: docs 100%.
- [pass] Description completeness — 98% of operations + parameters have substantive descriptions. Investigated: spec 100%, sdk 100%.
- [pass] Changelog published — Newest official SDK activity 0 day(s) ago. Investigated: sdk 100%, spec 0%, docs 0%.
- [fail] Quickstart present — No quickstart/getting-started page found at the conventional paths. Investigated: docs 0%.

### Agent Discovery

- [pass] Registry & SDK presence — Indexed on Context7 (websites/developers_klaviyo_en, 8780 snippets). Investigated: docs 100%, sdk 100%, cli 100%, mcp 0%, wellknown 0%.
- [warn] Docs reachable, not hard auth-gated — 1 JavaScript redirect(s) detected across 1 pages. Investigated: docs 50%.
- [warn] Crawlable / AEO — No sitemap discoverable via robots.txt or /sitemap.xml on the docs host. Investigated: wellknown 50%.
- [fail] llms.txt present, valid & comprehensive — No llms.txt found at any candidate location (https://developers.klaviyo.com/en/llms.txt, https://developers.klaviyo.com/llms.txt, https://developers.klaviyo.com/docs/llms.txt). Investigated: docs 0%, sdk 0%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — Single base error "KlaviyoAPIException" with 6 subclasses. Investigated: sdk 100%, spec 0%, docs 0%.
- [pass] Operation purpose clarity — 97% of operations have a clear summary + operationId an agent can select on. Investigated: spec 100%.
- [warn] Agent-navigable, token-efficient docs — No pages support .md URLs (0/1 tested). Investigated: docs 64%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 2 surfaces (spec, docs) is 5% (threshold 35% for full credit).
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.
- [fail] Docs structured data — Neither JSON-LD nor OpenGraph/meta tags detected across 3 assessed pages (3 JS-rendered). Investigated: docs 0%.

### Agent Usability

- [warn] Sandbox separation — No test-mode flag or sandbox environment is exposed. Investigated: sdk 50%, spec 0%, docs 0%.
- [fail] Idempotency documented — 0% of mutating operations document idempotency. Investigated: spec 0%, docs 0%, sdk 0%.
- [fail] Rate-limit signaling — No rate-limit response headers documented. Investigated: spec 0%, docs 0%.
- [fail] Runnable collection with test scripts — No public Postman workspace discovered for the org. Investigated: platform 0%.
- [skip] Pagination documented & consistent — No surface produced evidence for this capability in this run.

## Executive Summary

Klaviyo's API program shows meaningful strengths in documentation parseability and crawlability, but two areas are holding back partner and agent success: agents cannot reliably discover or operate against the API without manual intervention, and partners lack the runnable, reliability-anchored context needed to build production-grade integrations quickly. The highest-priority work is making the API surface machine-discoverable and operationally trustworthy — closing these gaps will let partners and their agents move from evaluation to live integration without friction or guesswork.