# Nylas — API Agent Score

> Score: 88/100 (Grade: A) | Domain: nylas.com | Rubric: 1.0.0 | Checked: July 24, 2026

Nylas scored 88/100 (A), classified "ai-ready".

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

## Summary

- Overall: 88/100 (A)
- Classification: ai-ready

## Category Scores

- API Design: 94/100 (A+)
- Developer Experience: 79/100 (B)
- Agent Discovery: 89/100 (A)
- Agent Understanding: 79/100 (B)
- Agent Usability: 96/100 (A+)

## Check Results

### API Design

- [pass] Schema coverage & depth — 386/386 (100%) public params are fully typed (no any/**kwargs). Analyzer confirms all methods have a derivable input schema. Investigated: sdk 100%, spec 79%.
- [pass] Auth declared & discoverable — Authentication required (global or on every operation). Investigated: docs 100%, spec 50%, wellknown 0%.
- [warn] Machine-readable, versioned contract — info.version="1.0.0" set but no versioning scheme (URL / header / media type) detected. Investigated: spec 75%, docs 50%.
- [pass] Security & governance hygiene — No credential-shaped strings detected in spec. Investigated: spec 100%, wellknown 0%.
- [pass] Example coverage — 100% example coverage across params + responses. Investigated: spec 100%, docs 100%, sdk 100%.

### Developer Experience

- [pass] Self-service developer portal — Signup page at https://www.nylas.com/wp-content/uploads/free-trial.png (CSR-rendered — body classifier inconclusive); free tier / sandbox documented in pricing/docs. Investigated: docs 100%.
- [pass] Code samples in docs — Code samples in 5 language(s) across docs (top: shell, python, javascript); 10/20 pages have ≥ 2 languages on the same page. Investigated: docs 100%.
- [pass] Description completeness — 41% description completeness. Investigated: spec 100%, sdk 92%.
- [pass] Changelog published — Newest official SDK activity 2 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] Docs reachable, not hard auth-gated — All 50 sampled pages are publicly accessible. Investigated: docs 100%.
- [pass] Registry & SDK presence — Indexed on Context7 (websites/developer_nylas, 16569 snippets). Investigated: docs 100%, sdk 100%, cli 100%, mcp 0%, wellknown 0%.
- [warn] llms.txt present, valid & comprehensive — No llms.txt directive found in HTML of any of 50 sampled pages. Investigated: docs 69%, sdk 0%.
- [warn] Crawlable / AEO — Sitemap present (1 entries) but carries no lastmod values. Investigated: wellknown 75%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — No 4xx/5xx response codes (or default error response) documented anywhere in the spec. Investigated: docs 100%, spec 50%, sdk 0%.
- [warn] Operation purpose clarity — 80% of operations are agent-inferable (target 90%+). Investigated: spec 88%.
- [warn] Agent-navigable, token-efficient docs — 1 of 50 pages have substantive content differences between markdown and HTML (avg 4% missing). Investigated: docs 75%.
- [pass] Docs structured data — JSON-LD Article markup on 18/18 assessed pages (100%) with dateModified present. Investigated: docs 100%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 3 surfaces (spec, docs, sdk) is 4% (threshold 35% for full credit).
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.

### Agent Usability

- [pass] Idempotency documented — idempotency documented in the docs site at https://developer.nylas.com/docs/v3/email/idempotent-send/. Investigated: spec 100%, docs 100%, sdk 100%.
- [pass] Rate-limit signaling — rate-limit behavior documented in the docs site at https://developer.nylas.com/docs/cookbook/use-cases/build/hosted-vs-custom-oauth/. Investigated: spec 100%, docs 100%.
- [pass] Pagination documented & consistent — Pagination params detected on 20 list endpoint(s). Investigated: docs 100%, spec 88%.
- [pass] Sandbox separation — Sandbox environments are exposed (sandbox). Investigated: sdk 100%, spec 0%, docs 0%.
- [warn] Runnable collection with test scripts — No test scripts found in the workspace's collections. Investigated: platform 50%.

## Executive Summary

Nylas has a strong API design and usability foundation, but two gaps are holding back partner and agent adoption. The most urgent priority is agent context: without a structured instructions file, AI agents coding against the Nylas API lack the guidance they need to integrate correctly and efficiently. Close behind is onboarding friction — partners are missing a quickstart path that gets them to a first successful call without support. Fixing these two areas will materially improve how fast partners and their agents go from discovery to working integration.