update_price

Manually update the price on a saved item. Records old and new price for comparison. This is a manual correction, not automatic price tracking.

SERVERGrabblist SOURCEhttps://mcp.grabbitapp.com/api/mcp

Medium RISK CLASS

Category Write

Parameters 42 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/com-grabbitapp-grabblist/update-price.md

WHAT IT DOES

What update_price does on Grabblist

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

Parameter	Type	Required	Description
`id`	string	Yes	The item ID
`price`	number	Yes	New current price
`reason`	string	—	Why this change was made (shown to user in change history)
`source`	string	—	Price update source

Parameters from the server's own tool schema.

RISK

Why update_price is rated Medium

An AI agent can call update_price faster than any human can review: one bad instruction and it creates or modifies resources in Grabblist by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_price safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Grabblist, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For update_price, this is the rule to start with:

update_price Rate-limited

update_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": {
    "update_price": {
      "limits": [
        {
          "counter": "update_price_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Grabblist, apply this rule, and every update_price call is checked against it from then on.

FAQ

Questions about update_price

What does the update_price tool do? +

Manually update the price on a saved item. Records old and new price for comparison. This is a manual correction, not automatic price tracking. It is categorised as a Write tool in the Grabblist MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does update_price accept? +

update_price accepts 4 parameters: id, price, reason, source. Required: id, price. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on update_price? +

Register the Grabblist MCP server in PolicyLayer and add a rule for update_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 Grabblist. Nothing to install.

What risk level is update_price? +

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

Can I rate-limit update_price? +

Yes. Add a rate_limit block to the update_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 update_price completely? +

Set action: deny in the PolicyLayer policy for update_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 update_price? +

update_price is provided by the Grabblist MCP server (https://mcp.grabbitapp.com/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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