watchers.stock-price · MCP: Risk & Policy

WHAT IT DOES

What watchers.stock-price does on Mcp

AI agents use watchers.stock-price to create or update resources in Mcp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp environment.

WHY IT NEEDS A POLICY

Why watchers.stock-price needs a policy

An AI agent can call watchers.stock-price faster than any human can review — one bad instruction and it creates or modifies resources in Mcp by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

watchers.stock-price Rate-limited

watchers.stock-price 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "watchers.stock-price": {
      "limits": [
        {
          "counter": "watchers.stock-price_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about watchers.stock-price

What does the watchers.stock-price tool do? +

WATCHER: get a signed callback when a US stock crosses a price you set. Arm once, pay once (no account, no API key) — we poll the quote during US market hours and POST your custom payload to callbackUrl the moment the condition is met. conditionType: \. It is categorised as a Write tool in the Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on watchers.stock-price? +

Register the MCP server in PolicyLayer and add a rule for watchers.stock-price: 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 Mcp. Nothing to install.

What risk level is watchers.stock-price? +

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

Can I rate-limit watchers.stock-price? +

Yes. Add a rate_limit block to the watchers.stock-price 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 watchers.stock-price completely? +

Set action: deny in the PolicyLayer policy for watchers.stock-price. 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 watchers.stock-price? +

watchers.stock-price is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.