Spend limits for AI agents that pay with x402: every paywall is policy-checked before a cent moves.
Connect Runs on your machine
claude mcp add rein -e REIN_AGENT_FILE=<REIN_AGENT_FILE> -e REIN_ENGINE_URL=<REIN_ENGINE_URL> -e REIN_AGENT_ID=<REIN_AGENT_ID> -e REIN_ENGINE_API_KEY=<REIN_ENGINE_API_KEY> -e REIN_PAYER_PRIVATE_KEY=<REIN_PAYER_PRIVATE_KEY> -e REIN_NETWORK_PROFILE=<REIN_NETWORK_PROFILE> -- npx -y @reinconsole/[email protected]{
"mcpServers": {
"rein": {
"command": "npx",
"args": [
"-y",
"@reinconsole/[email protected]"
],
"env": {
"REIN_AGENT_FILE": "<REIN_AGENT_FILE>",
"REIN_ENGINE_URL": "<REIN_ENGINE_URL>",
"REIN_AGENT_ID": "<REIN_AGENT_ID>",
"REIN_ENGINE_API_KEY": "<REIN_ENGINE_API_KEY>",
"REIN_PAYER_PRIVATE_KEY": "<REIN_PAYER_PRIVATE_KEY>",
"REIN_NETWORK_PROFILE": "<REIN_NETWORK_PROFILE>"
}
}
}
}{
"mcpServers": {
"rein": {
"command": "npx",
"args": [
"-y",
"@reinconsole/[email protected]"
],
"env": {
"REIN_AGENT_FILE": "<REIN_AGENT_FILE>",
"REIN_ENGINE_URL": "<REIN_ENGINE_URL>",
"REIN_AGENT_ID": "<REIN_AGENT_ID>",
"REIN_ENGINE_API_KEY": "<REIN_ENGINE_API_KEY>",
"REIN_PAYER_PRIVATE_KEY": "<REIN_PAYER_PRIVATE_KEY>",
"REIN_NETWORK_PROFILE": "<REIN_NETWORK_PROFILE>"
}
}
}
}{
"servers": {
"rein": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@reinconsole/[email protected]"
],
"env": {
"REIN_AGENT_FILE": "<REIN_AGENT_FILE>",
"REIN_ENGINE_URL": "<REIN_ENGINE_URL>",
"REIN_AGENT_ID": "<REIN_AGENT_ID>",
"REIN_ENGINE_API_KEY": "<REIN_ENGINE_API_KEY>",
"REIN_PAYER_PRIVATE_KEY": "<REIN_PAYER_PRIVATE_KEY>",
"REIN_NETWORK_PROFILE": "<REIN_NETWORK_PROFILE>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
REIN_AGENT_FILEOptional | Path to the rein-agent.json written by `npx @reinconsole/init` (engine URL, agent id, API key, wallet). |
REIN_ENGINE_URLOptional | Policy engine base URL. Required unless REIN_AGENT_FILE is set. |
REIN_AGENT_IDOptional | The one agent this server speaks for. Required unless REIN_AGENT_FILE is set. |
REIN_ENGINE_API_KEYOptional, secret | Bearer key for the engine, ideally an evaluate key narrowed to this agent. |
REIN_PAYER_PRIVATE_KEYOptional, secret | Agent wallet key. Omit for advisory mode: policy is checked, nothing is paid. |
REIN_NETWORK_PROFILEOptional | testnet (default) or mainnet: which network's 402s this server will pay. |
Details
| Package | @reinconsole/[email protected] (NPM, stdio) |
| First published | 18 Oct 2026 |
| Last updated | 18 Oct 2026 |
| Registry name | io.github.bugiiiii11/rein |
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