# Gusto — API Agent Score

> Score: 75/100 (Grade: B) | Domain: gusto.com | Rubric: 1.0.0 | Checked: July 24, 2026

Gusto scored 75/100 (B), classified "partially-ready".

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

## Summary

- Overall: 75/100 (B)
- Classification: partially-ready

## Category Scores

- API Design: 100/100 (A+)
- Developer Experience: 52/100 (D)
- Agent Discovery: 69/100 (C)
- Agent Understanding: 80/100 (A)
- Agent Usability: 74/100 (B)

## Check Results

### API Design

- [pass] Machine-readable, versioned contract — Versioning declared (info.version="2026-06-15") and header-versioning detected. Investigated: spec 100%, docs 100%.
- [pass] Schema coverage & depth — 8/8 (100%) public params are fully typed (no any/**kwargs). Analyzer confirms all methods have a derivable input schema. Investigated: sdk 100%, spec 67%.
- [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 — 51% example coverage (target 80%+). Investigated: spec 100%, sdk 50%.

### Developer Experience

- [pass] Description completeness — 98% of operations + parameters have substantive descriptions. Investigated: spec 100%, sdk 88%.
- [pass] Changelog published — Newest official SDK activity 0 day(s) ago. Investigated: sdk 100%, spec 0%, docs 0%.
- [fail] Self-service developer portal — No signup page detected across conventional paths (/signup, /sign-up, /register, /get-started, /console/signup, /dashboard/signup, /try, /try-free, /free, /free-trial, /start, /start-free). Investigated: docs 0%.
- [fail] Quickstart present — No quickstart/getting-started page found at the conventional paths. Investigated: docs 0%.
- [skip] Code samples in docs — No surface produced evidence for this capability in this run.

### Agent Discovery

- [pass] Registry & SDK presence — Indexed on Context7 (websites/gusto_app-integrations_reference, 2 snippets). Investigated: docs 100%, cli 100%, sdk 50%.
- [warn] Docs reachable, not hard auth-gated — 50 JavaScript redirect(s) detected across 50 sampled pages. Investigated: docs 50%.
- [warn] llms.txt present, valid & comprehensive — Could not test any pages; 50 failed to fetch. Investigated: docs 43%, sdk 0%.
- [warn] Crawlable / AEO — No sitemap discoverable via robots.txt or /sitemap.xml on the docs host. Investigated: wellknown 50%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — 5 distinct 4xx/5xx response codes documented. Investigated: docs 100%, spec 50%, sdk 50%.
- [pass] Operation purpose clarity — 100% of operations have a clear summary + operationId an agent can select on. Investigated: spec 100%.
- [warn] Agent-navigable, token-efficient docs — No sampled pages support .md URLs (0/50 tested). Investigated: docs 69%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 2 surfaces (spec, sdk) is 12% (threshold 35% for full credit).
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.
- [skip] Docs structured data — No surface produced evidence for this capability in this run.

### Agent Usability

- [pass] Idempotency documented — Built-in retry machinery is present (grep-derived). Investigated: sdk 100%, spec 0%, docs 0%.
- [pass] Pagination documented & consistent — Pagination params detected on 65 list endpoint(s). Investigated: spec 100%, docs 100%.
- [pass] Sandbox separation — Sandbox environments are exposed (sandbox). Investigated: sdk 100%, spec 0%, docs 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%.

## Executive Summary

Gusto's API program shows strong fundamentals in description quality, discoverability, and doc parseability — but partners face two critical blockers: there is no self-service portal or quickstart to get them to a first successful call without human intervention, and AI agents lack the structured context files and runnable examples they need to integrate reliably. Prioritize building a self-service onboarding experience first, then close the agent-readiness gaps (instructions file, runnable collection, and rate-limit signaling) to make the program viable for the AI-assisted integrations partners increasingly expect.