Inbox Zero
Search Gmail and Outlook, save drafts, manage email rules, and view email stats.
Runs in the cloud
Agentsim MCP
Overview
Description from the maker (original English)
Control plane for agent auth walls. Connector 0 handles SMS OTP with US test numbers.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi3 of 4 passedChecked from public information; code not scanned yet
- UsageiVery new★ 1
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Chat & email
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 3 of 4 passed
- Runs on the maker’s server: what you ask it goes through their server.
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://mcp.agentsim.dev/mcpRun this in your terminal
claude mcp add --transport http agentsim https://mcp.agentsim.dev/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"agentsim": {
"url": "https://mcp.agentsim.dev/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"agentsim": {
"type": "http",
"url": "https://mcp.agentsim.dev/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://mcp.agentsim.dev/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
Which apps can use it
Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.
Connect over the internet in
ClaudeChatGPTGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast
Related guides
What it can do
The server asks you to sign in before it lists its tools.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 11, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain agentsim.dev (the registry checks domain ownership)
- ✓ Pass
Still maintained
Code last changed 42 days ago
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- ✓ Pass
Endpoint responds
Responded in 279 ms (HTTP 401)
- ! Caution
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Chat & emaili
- More stars than 77% of the other 1934 servers in this category
- Published to the registry more recently than 38% of the other 1934 servers in this category
- Basic checks equal to or better than 50% of the other 1934 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Agentsim MCP safe?
It passed 3 of 4 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed 42 days ago, and the latest version (0.33.3) reached the registry 42 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Inbox Zero, Agent-Native Mail, Agent-Native Dispatch
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Agent-Native Mail
Agent-Native Superhuman - email client with keyboard shortcuts and AI triage
Runs in the cloud
Agent-Native Dispatch
Central Slack/Telegram router with jobs, memory, approvals, and A2A delegation
Runs in the cloud
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
agentsim-mcp
Availability: Live SMS is self-serve for owned public HTTPS services after exact-origin verification and an allow policy. Hobby includes 10 live US SMS sessions per UTC month, with one active live session per account and no card required. Builder is $99/month and includes 50 live US SMS sessions. Checkout shows tax and renewal terms before payment, and existing agreements keep their terms. Check current access and channel support before using live examples.
MCP server that exposes AgentSIM challenge tools to AI coding assistants: Codex CLI, Claude Code, Cursor, Windsurf, and any other MCP-compatible host. Primary tools: open_challenge, wait_for_verdict. Aliases: provision_number, wait_for_otp.
Setup
For Codex CLI, follow Connect Codex. It covers key handling, the SMS wait timeout, and browser access. Then use the complete phone sign-in prompt.
Claude Code
claude mcp add agentsim -e AGENTSIM_API_KEY=asm_live_xxx -- uvx agentsim-mcpClaude Desktop
Add to ~/Library/Application Support/Claude/claude_desktop_config.json:
{"mcpServers": { "agentsim": { "command": "uvx", "args": ["agentsim-mcp"], "env": { "AGENTSIM_API_KEY": "asm_live_xxx" } } } }
Cursor / Windsurf
Add agentsim-mcp as a stdio MCP server with AGENTSIM_API_KEY in the environment config.
Remote (no install)
Connect directly to the hosted MCP server without installing anything locally:
{"mcpServers": { "agentsim": { "type": "streamable-http", "url": "https://mcp.agentsim.dev/mcp", "headers": { "x-api-key": "asm_live_..." } } } }
The hosted endpoint uses stateless HTTP and does not issue mcp-session-id headers. The session_id returned by AgentSIM tools identifies a challenge and remains valid across tool calls.
Tools
Control-Plane Nouns (Recommended)
| Tool | Description | |||
|---|---|---|---|---|
identify_agent | Add a stable agent ID to the console without opening a challenge, sending SMS, or using allowance | |||
open_challenge | Open an authentication challenge session for a required owned service_url; accepts channel (sms_otp \ | email_otp \ | magic_link \ | webauthn_required), returns session ID + identifier |
wait_for_verdict | Long-poll for the challenge verdict — returns structured outcome including otp_code, magic_link, or webauthn_required; policy denial fails on open | |||
get_messages | Read SMS metadata and parsed codes; reading codes consumes them | |||
release_number | Release a session early (allocation returned to pool) | |||
list_numbers | List all active sessions for this account |
Legacy Aliases (Backward Compatibility)
| Tool | Maps to | Description |
|---|---|---|
provision_number | open_challenge(channel=sms_otp) | Provision a temporary programmable US number for SMS OTP — kept for backward compatibility |
wait_for_otp | wait_for_verdict | Legacy wait with automatic extension after timeout by default; number may be unchanged |
Auth
For stdio, set AGENTSIM_API_KEY in the process environment. For hosted HTTP, every request must send its own x-api-key; the server validates and forwards that caller-scoped key. Get a key at console.agentsim.dev.
Supported Countries
US