set_agent_uri · Basis MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_agent_uri does on Basis MCP Server

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

WHY IT NEEDS A POLICY

Why set_agent_uri needs a policy

This tool modifies agent configuration (the URI endpoint), which is a reversible write operation. It does not execute arbitrary code, delete data irreversibly, or move funds. The severity is medium because a malicious agent URI could redirect subsequent operations to an attacker-controlled endpoint, creating downstream risks, though the tool itself only performs configuration update.

From the tool's definition Tool name 'set_agent_uri' and description 'Update your agent' indicate modification of agent configuration data. The verb 'Update' and the nature of setting a URI confirm data mutation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_agent_uri Rate-limited

set_agent_uri 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": {
    "set_agent_uri": {
      "limits": [
        {
          "counter": "set_agent_uri_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 Basis MCP Server, so you can run agents against it safely.

FAQ

Questions about set_agent_uri

What does the set_agent_uri tool do? +

Update your agent. It is categorised as a Write tool in the Basis 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 set_agent_uri? +

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

What risk level is set_agent_uri? +

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

Can I rate-limit set_agent_uri? +

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

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

set_agent_uri is provided by the Basis MCP Server MCP server (launch-on-basis/mcp-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.