# Nylas CLI

> Probe-verified (tier 2 of 3). Last checked 2026-08-23. 5 of 5 capability checks passed.

- host: cli.nylas.com
- url: https://cli.nylas.com/
- category: email calendar contacts cli
- type: tool
- language: en

## Probe-verified · tier 2 of 3

Probed live on 2026-08-23 against rubric v1. 5 of 5 checks passed.

- PASS — Markdown negotiation
- PASS — Markdown twin at a predictable URL
- PASS — llms.txt
- PASS — API catalog
- PASS — MCP server answers

## Unverified actions

Read from the page's own content, with the wording each was drawn from. Inference is kept separate from tested facts; an agent completing the action is tier 3.

- **register** — "Install the CLI" → `https://cli.nylas.com/#install`
- **register** — "brew install nylas/nylas-cli/nylas"
- **register** — "Log in with nylas auth config" → `https://cli.nylas.com/guides/getting-started#set-up-with-api-key`

## Summary

Nylas CLI is a free, open-source command-line tool for managing email, calendars, contacts, and AI agent inboxes across multiple providers.

## Context

297 sites in this index share the type "tool"; 110 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known-Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark