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Nylas API for coding agents

View Agent Bench results API docs

Nylas is useful when an agent needs a unified mailbox API, but the authorization grant must be in place before autonomous work begins. Its Agent Bench task failed on that boundary, not on basic API discovery.

#6of 7
Email API agent readiness

Current CLI and MCP support are strong, but the Agent Bench live-mailbox task failed because the required provider grant was unavailable.

Last checked Aug 17, 2026 4 primary sources Tested by All Them APIs
Agent Bench evidence

Discovery 86; task evaluation 21.

All Them APIs measured one Claude Code task. Discovery and task performance are reported separately.

All Them APIs · Email task

Claude Code task result

D40/100
Verification failed

The agent could not create a real mailbox without an authenticated provider grant. It generated 13 files and demo-mode output, but did not complete the live workflow.

Discovery
86
Evaluation
21
Time
12m 4s
Tool calls
63
Errors
15
Cost
$0.93
This task score and the category setup ranking come from separate Agent Bench protocols.
View Agent Bench results
Agent verdict

Can a coding agent use Nylas? Only after mailbox authorization.

Nylas is discoverable and well packaged, but a coding agent cannot complete a live mailbox task without a real provider grant. The Agent Bench run produced demo output instead of the requested live result.

Strong discovery; authorization is the hard boundary
Review fit, workflows, and caveats

Good fit

  • Products connecting customer mailboxes
  • Cross-provider email and calendar workflows
  • Teams that can complete OAuth authorization before agent execution

Check before shipping

  • Live tasks require a real provider grant
  • The Agent Bench task did not complete
  • The failed run generated extensive demo code

Common workflows

  • Read and send mailbox email
  • Sync messages and threads
  • Connect calendar and scheduling
  • Work across multiple email providers
Recommended setupOfficial CLI and MCP after mailbox grant
Nylas CLIbrew install nylas/nylas-cli/nylas

Run nylas init, then connect a mailbox before asking the agent to perform live work.

MCP clientsnylas mcp

Starts the MCP server after the CLI and mailbox grant are configured.

Node.js / TypeScriptnpm install nylas

Use the official SDK when mailbox work belongs inside the application.

Open official setup documentation
Reference

API limits and source records

Base URL, authentication, pricing, SDKs, rate limits, and checked documentation.

API basics
Base URL
https://api.us.nylas.com/v3
Authentication
Bearer API key and OAuth 2.0 provider grant
Free tier
Sandbox and current plan limits are listed in the Nylas dashboard
Credit card
Not required
Rate limit
Endpoint and provider dependent
Testing
A real mailbox workflow requires a valid provider grant; demo output is not a substitute
4 official SDKs
Node.jsPythonRubyJava / Kotlin
4 checked sources
AuthenticationOAuth grants · hosted auth · provider scopesEmail quickstartbase URL · grant ID · SDKsSend emailsend workflowOfficial CLI and MCPCLI · MCP server · agent guides · mailbox setup
Pricing, status, and alternatives
PricingStatusChangelogGitHubAgentMailResendPostmark

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