# Nylas Codex API Evaluation

**Category:** Email
**Score:** 69 (C)

This is the agent-readable Devtool Arena evaluation page for Nylas on Codex API.

## Summary

| Metric | Value |
|--------|-------|
| Status | completed |
| Overall score | 69 |
| Grade | C |
| Eval score | 63 |
| Discovery score | 86 |
| Cost | $1.01 |
| Runtime | 3m 4s |
| Tool calls | 48 |
| Errors | 2 |
| Tokens used | 659086 |
| Success | Yes |

## Agent-Readiness Checklist

| Signal | Evidence |
|--------|----------|
| Context7 | Not found |
| llms.txt | https://developer.nylas.com/llms.txt |
| MCP server | https://github.com/nylas/cli |
| Typed SDK | https://github.com/nylas/nylas-nodejs |
| OpenAPI | https://developer.nylas.com/openapi.json |
| Agent skills | https://github.com/nylas/skills |
| CLI | https://github.com/nylas/cli |

## Evaluation Prompt

````text

# Task
Using https://developer.nylas.com/docs/v3/email/, complete the following task:

Using Nylas, build me a script that:

1. Create a new email inbox
2. Send an email from that inbox to "support@lightsage.com" with subject "Hello from Lightsage Leaderboard" and body "This is a ***** email sent via Nylas."
3. List all messages in the inbox
4. Print the inbox details, sent message status, and message list as JSON 

## Execution
After creating the script, run it to verify it works:
```bash
cd /home/daytona/app && python <your_script>.py
```

The script should print output to stdout. If there are errors, debug and fix them until it runs successfully.

````

## Grader Results

| Check | Passed | Weight | Score | Details |
|-------|--------|--------|-------|---------|
| Cost | No | 0 | 0 | $1.01 (≥$1.00, too expensive) |
| Time | No | 0 | 0 | 184s (3–5min, slow) |
| Efficiency | No | 0 | 0 | 48 tool calls (>25, inefficient) |
| Found Docs | Yes | 0 | — | Touched docs at developer.nylas.com: yes (35 matching tool calls) |
| Zero Errors | No | 0 | — | Tool outputs with errors/tracebacks: 2 |
| Syntax Valid | Yes | 0 | — | Code compiles/parses correctly |
| Created Files | Yes | 0 | — | Generated files: 1 (need ≥1) |
| Full Execution | Yes | 0 | — | Method: full_execution, Exit: 0 |

## Run Artifacts

| Artifact | Value |
|----------|-------|
| Conversation turns | 53 |
| Tool call traces | 48 |
| Generated files | 1 |
| Exit code | 0 |
| Completed at | 2026-09-30T04:30:58.392234+00:00 |

### Generated Files

- /home/daytona/app/inbox_manager.py

## Related Pages

- [Codex API leaderboard](/leaderboard/codex/api)
- [Compare Codex API companies](/leaderboard/codex/api/compare)
- [Agent Landscape](/leaderboard/discoverability)

Canonical URL: https://devtoolarena.com/codex/api/nylas