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Control plane for agent auth walls. Connector 0 handles SMS OTP with US test numbers.
About
Control plane for agent auth walls. Connector 0 handles SMS OTP with US test numbers.
Remote endpoints: streamable-http: https://mcp.agentsim.dev/mcp
Security Report
Valid MCP server (0 strong, 4 medium validity signals). 6 known CVEs in dependencies (1 critical, 3 high severity) Imported from the Official MCP Registry.
Endpoint verified · Requires authentication · 7 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Connect
Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"dev-agentsim-mcp": {
"url": "https://mcp.agentsim.dev/mcp"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
agentsim-mcp
Availability: The free Hobby plan includes 10 live US SMS sessions per month for apps you own, with one active live session per account and no card required. Sample demos do not use the allowance. The new paid live offer is not open yet; existing agreements remain unchanged. 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-mcp
Claude 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 |
|---|---|
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
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