postAd

THE RISK

Medium Risk

Why postAd needs a policy

This tool creates a new P2P advertisement on a cryptocurrency exchange. While creation is typically Write-category, the high severity reflects that: (1) it occurs in a financial system (Bybit exchange), (2) advertisements can commit the user to trade obligations and affect market positioning, and (3) an AI agent posting unsolicited or incorrect ads could cause reputational damage or lock up assets.

From the tool's definition Tool name 'postAd' and description 'Create a new P2P advertisement' indicate creation of a new data record. The tool performs an irreversible or difficult-to-reverse action in a financial context (peer-to-peer trading on Bybit cryptocurrency exchange).

Documented attack patterns abuse exactly the kind of access postAd gives an agent:

POLICY

How to control postAd

PolicyLayer is an MCP gateway — it sits between your AI agents and Bybit MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for postAd:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "postAd": {
      "limits": [
        {
          "counter": "postad_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

postAd stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Bybit MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about postAd

What does the postAd tool do? +

Create a new P2P advertisement. It is categorised as a Write tool in the Bybit MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on postAd? +

Register the Bybit MCP Server MCP server in PolicyLayer and add a rule for postAd: 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 Bybit MCP Server. Nothing to install.

What risk level is postAd? +

postAd is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit postAd? +

Yes. Add a rate_limit block to the postAd 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 postAd completely? +

Set action: deny in the PolicyLayer policy for postAd. 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 postAd? +

postAd is provided by the Bybit MCP Server MCP server (bybit-exchange/trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bybit MCP Server tool call.

Start from Bybit MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →