market.arb.live · Rekko MCP: Risk & Policy

WHAT IT DOES

What market.arb.live does on Rekko MCP

AI agents invoke market.arb.live to trigger actions in Rekko MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why market.arb.live needs a policy

This tool executes a computational scan operation across live financial markets. While it does not directly move money (Financial category), it actively triggers an operation whose outcome and side-effects depend on runtime conditions and the AI agent's use of the results. An agent could use arbitrage signals to execute trades immediately, making this an Execute-tier risk.

From the tool's definition Tool description states 'Run a fresh cross-platform arbitrage scan' - the verb 'Run' indicates execution of an operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

market.arb.live Rate-limited

market.arb.live stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "market.arb.live": {
      "limits": [
        {
          "counter": "market.arb.live_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Rekko MCP, so you can run agents against it safely.

FAQ

Questions about market.arb.live

What does the market.arb.live tool do? +

Run a fresh cross-platform arbitrage scan (may take 10-30 seconds). It is categorised as a Execute tool in the Rekko MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on market.arb.live? +

Register the Rekko MCP server in PolicyLayer and add a rule for market.arb.live: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Rekko MCP. Nothing to install.

What risk level is market.arb.live? +

market.arb.live is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit market.arb.live? +

Yes. Add a rate_limit block to the market.arb.live rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block market.arb.live completely? +

Set action: deny in the PolicyLayer policy for market.arb.live. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides market.arb.live? +

market.arb.live is provided by the Rekko MCP server (rekko-ai/rekko-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.