check_calibre_web

Check Calibre-Web ebook library server health via GET /. 200 or redirect to /login = healthy. Default port 8083.

SERVERMcp Nettools SOURCEaaronckj/mcp-nettools

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aaronckj-mcp-nettools/check-calibre-web.md

WHAT IT DOES

What check_calibre_web does on Mcp Nettools

AI agents call check_calibre_web to retrieve information from Mcp Nettools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why check_calibre_web is rated Low

This is a simple health check that retrieves the status of a Calibre-Web server by making a read-only GET request to the root endpoint. It only observes and reports the server's state without modifying data, executing commands, or causing side effects. The blast radius is minimal—a misconfigured check might falsely report health status, but cannot damage systems or access sensitive data.

From the tool's definition Tool performs a GET request to check server health status (200 response or redirect to /login indicates healthy state). No data modification, deletion, or command execution occurs.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs check_calibre_web safely

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

check_calibre_web Allowed

check_calibre_web is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "check_calibre_web": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about check_calibre_web

What does the check_calibre_web tool do? +

Check Calibre-Web ebook library server health via GET /. 200 or redirect to /login = healthy. Default port 8083. It is categorised as a Read tool in the Mcp Nettools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_calibre_web? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for check_calibre_web: 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 Mcp Nettools. Nothing to install.

What risk level is check_calibre_web? +

check_calibre_web is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit check_calibre_web? +

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

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

check_calibre_web is provided by the Mcp Nettools MCP server (aaronckj/mcp-nettools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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