Server data from the Official MCP Registry
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
AgentSIM MCP server is well-designed with proper authentication via API key, appropriate permission scoping, and clean code structure. The server requires AGENTSIM_API_KEY for all operations, validates input schemas rigorously, and makes authenticated HTTP calls to a backend service. Minor code quality observations exist (broad exception handling, missing validation of legacy tool parameters), but these do not materially impact security. Permissions align well with the server's purpose as an authentication challenge provisioning tool. Supply chain analysis found 6 known vulnerabilities in dependencies (1 critical, 3 high severity).
8 files analyzed · 10 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 Install & Connect
Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
Documentation
View on GitHubFrom the project's GitHub README.
agentsim-mcp
MCP server that exposes AgentSIM challenge tools to AI coding assistants: Claude Code, Cursor, Windsurf, and any other MCP-compatible host. Primary tools: open_challenge, wait_for_verdict. Aliases: provision_number, wait_for_otp.
Setup
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 — accepts channel (sms_otp | email_otp | magic_link | webauthn_required), returns session ID + identifier (phone number or email address) |
wait_for_verdict | Long-poll for the challenge verdict — returns structured outcome including otp_code, magic_link, webauthn_required, or policy_denied |
get_messages | List raw SMS messages received on a session |
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 | Long-poll until an OTP arrives — kept for backward compatibility |
Auth
Set AGENTSIM_API_KEY in your environment. Get your key at console.agentsim.dev.
Supported Countries
US (more coming soon)
Reviews
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