update_portfolio · Sablier MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_portfolio does on Sablier MCP Server

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

WHY IT NEEDS A POLICY

Why update_portfolio needs a policy

This tool creates or modifies portfolio data (Write category) rather than executing transactions (Financial), deleting records (Destructive), or merely reading data (Read). Medium severity reflects that portfolio modifications could cause analytical errors or misleading insights, but the lack of details about whether it commits actual financial obligations prevents a higher classification.

From the tool's definition Tool name 'update_portfolio' with empty description indicates it modifies portfolio data. The server context mentions 'analyze portfolios' and financial instruments, confirming this operates on financial data structures.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_portfolio Rate-limited

update_portfolio 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": {
    "update_portfolio": {
      "limits": [
        {
          "counter": "update_portfolio_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 Sablier MCP Server, so you can run agents against it safely.

FAQ

Questions about update_portfolio

What does the update_portfolio tool do? +

update_portfolio. It is categorised as a Write tool in the Sablier 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 update_portfolio? +

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

What risk level is update_portfolio? +

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

Can I rate-limit update_portfolio? +

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

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

update_portfolio is provided by the Sablier MCP Server MCP server (sablier-ai/sablier-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.