add_stock_holding · Corpus MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_stock_holding does on Corpus MCP Server

AI agents use add_stock_holding to create or update resources in Corpus MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Corpus MCP Server environment.

WHY IT NEEDS A POLICY

Why add_stock_holding needs a policy

This tool creates new records in a financial portfolio tracking system. While it modifies financial data, it is reversible (not destructive) and does not move actual money or create financial obligations—it records holdings in a portfolio tracker application.

From the tool's definition Tool name 'add_stock_holding' and description 'Add a new stock holding' indicate data creation/modification. The server context describes managing financial portfolios, tracking holdings, and logging transactions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_stock_holding Rate-limited

add_stock_holding 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": {
    "add_stock_holding": {
      "limits": [
        {
          "counter": "add_stock_holding_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 Corpus MCP Server, so you can run agents against it safely.

FAQ

Questions about add_stock_holding

What does the add_stock_holding tool do? +

Add a new stock holding. It is categorised as a Write tool in the Corpus 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 add_stock_holding? +

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

What risk level is add_stock_holding? +

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

Can I rate-limit add_stock_holding? +

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

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

add_stock_holding is provided by the Corpus MCP Server MCP server (mathankarthik18/corpus-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.