Manus AI vs Claude Code for Email Automation

Two agents, same CLI

Manus is an AI agent platform that runs tasks in a sandboxed environment. Claude Code is Anthropic's CLI-based coding agent that runs locally on your machine.

Both can send emails, read inboxes, search threads, create calendar events, and check availability using the Nylas CLI. The underlying commands are identical — nylas email send, nylas email list, nylas calendar events create, and so on. What differs is the integration method:

• Manus uses Skills — a SKILL.md file that teaches the agent which CLI commands to run and when
• Claude Code uses MCP — the Model Context Protocol, where nylas mcp serve exposes CLI tools as a standardized server

Setup comparison

Manus requires uploading a Skill folder. Claude Code requires adding an MCP server config.

Manus: upload a Skill

Create a folder with a SKILL.md file and a setup script, then upload it to Manus:

# SKILL.md frontmatter
---
name: nylas-email
description: >
  Read, send, and search email using the Nylas CLI.
  Activate when the user asks about email, inbox, or calendar.
metadata:
  author: nylas
  version: "1.0"
---

## Setup
Run `bash scripts/setup.sh` to install the Nylas CLI.

## Commands
- `nylas email list --limit 10 --json` — list recent messages
- `nylas email send --to user@example.com --subject "Hello" --body "Hi" --yes`
- `nylas calendar list --json` — list upcoming events

Claude Code: add MCP config

Run the install command or add the server config manually:

nylas mcp install --assistant claude-code

Or add the server config manually to .mcp.json:

{
  "mcpServers": {
    "nylas": {
      "command": "nylas",
      "args": ["mcp", "serve"]
    }
  }
}

Feature comparison

When to use Manus

• Background tasks — Manus can run multi-step workflows in the background without keeping a terminal open
• Non-technical users — no local CLI install needed, everything runs in the Manus sandbox
• Sandboxed execution — commands run in an isolated VM, not on your machine
• No local setup — Manus installs the CLI in its own environment automatically

When to use Claude Code

• Developers — Claude Code is designed for coding workflows where email/calendar is one piece of a larger task
• Local execution — commands run on your machine with your credentials, no data leaves your environment
• MCP ecosystem — combine Nylas with other MCP servers (databases, APIs, file systems) in one agent session
• Code-heavy workflows — write scripts that use CLI output, pipe data between tools, automate complex sequences

Manus Skill example

After uploading the Skill, activate it with the / slash command in Manus:

# In Manus chat
/nylas-email

# Then prompt naturally:
"Summarize my last 5 emails and draft a reply to the one from Alice"

Manus reads the SKILL.md, runs the setup script if needed, then executes the appropriate nylas email commands in its sandbox.

Claude Code MCP example

After installing the MCP server, Claude Code discovers Nylas tools automatically:

# In Claude Code terminal
claude

# Then prompt naturally:
"Read my inbox, find emails from Alice, and draft a reply summarizing the thread"

Claude Code calls the Nylas MCP tools directly — no manual CLI commands needed. The MCP server translates tool calls into nylas email and nylas calendar commands behind the scenes.

Next steps

• Set up the Manus Skill — full walkthrough with SKILL.md, scripts, and troubleshooting
• Set up Claude Code MCP — install the MCP server for Claude Code, Cursor, or VS Code
• Command reference — browse all Nylas CLI commands available to both agents