update_book_status · Personal Library MCP Server MCP

WHAT IT DOES

What update_book_status does on Personal Library MCP Server

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

WHY IT NEEDS A POLICY

Why update_book_status needs a policy

update_book_status modifies book metadata (owned/read status) in the SQLite database, but the changes are reversible—a user can update the status again to correct any mistake. This is a typical Write operation. It is not Destructive (no permanent deletion), not Execute (no code/shell execution), not Financial, and not Read (it changes data, not just retrieves it).

From the tool's definition Tool description states it 'Updates the owned and/or read status of a book by ISBN,' which modifies existing data (status fields) reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_book_status Rate-limited

update_book_status 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_book_status": {
      "limits": [
        {
          "counter": "update_book_status_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 Personal Library MCP Server, so you can run agents against it safely.

FAQ

Questions about update_book_status

What does the update_book_status tool do? +

Updates the owned and/or read status of a book by ISBN. It is categorised as a Write tool in the Personal Library 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_book_status? +

Register the Personal Library MCP Server MCP server in PolicyLayer and add a rule for update_book_status: 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 Personal Library MCP Server. Nothing to install.

What risk level is update_book_status? +

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

Can I rate-limit update_book_status? +

Yes. Add a rate_limit block to the update_book_status 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_book_status completely? +

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

update_book_status is provided by the Personal Library MCP Server MCP server (srgsanky/mcp-demo). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.