add_extra_fields_to_item · RSpace MCP Server MCP

WHAT IT DOES

What add_extra_fields_to_item does on RSpace MCP Server

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

WHY IT NEEDS A POLICY

Why add_extra_fields_to_item needs a policy

The verb 'add' combined with the action of extending an item with new fields indicates a reversible data modification operation (Write category). Severity is medium because modifying item metadata in a research management system could affect data integrity or downstream processes, but is not destructive or financial.

From the tool's definition Tool name 'add_extra_fields_to_item' indicates modification of an item's properties by adding fields. Description is empty, so classification relies on the name and context of sibling tools which perform create/modify operations on RSpace research data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_extra_fields_to_item Rate-limited

add_extra_fields_to_item 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_extra_fields_to_item": {
      "limits": [
        {
          "counter": "add_extra_fields_to_item_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 RSpace MCP Server, so you can run agents against it safely.

FAQ

Questions about add_extra_fields_to_item

What does the add_extra_fields_to_item tool do? +

add_extra_fields_to_item. It is categorised as a Write tool in the RSpace 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_extra_fields_to_item? +

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

What risk level is add_extra_fields_to_item? +

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

Can I rate-limit add_extra_fields_to_item? +

Yes. Add a rate_limit block to the add_extra_fields_to_item 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_extra_fields_to_item completely? +

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

add_extra_fields_to_item is provided by the RSpace MCP Server MCP server (rspace-os/rspace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.