read_content

Fetch specific content from a book using epub:// URL. Dynamically converts EPUB/PDF to text if needed.

SERVERCalibre SOURCE2b3pro/calibre-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade B, identity unverified Pull the record →

This record as markdown: /tools/2b3pro-calibre-mcp/read-content.md

WHAT IT DOES

What read_content does on Calibre

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

RISK

Why read_content is rated Low

This tool retrieves and extracts content from ebook files for reading purposes. The conversion to text is a presentation mechanism to enable reading, not a side effect that modifies the underlying library or data. No write, delete, execute, or financial operations are performed. The action is read-only with no persistent changes to the ebook library or metadata.

From the tool's definition Tool name 'read_content' and description 'Fetch specific content from a book' with 'Dynamically converts EPUB/PDF to text' indicates retrieval without modification. No language suggesting creation, deletion, or execution of code.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs read_content safely

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

read_content Allowed

read_content 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": {
    "read_content": {}
  }
}

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

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

FAQ

Questions about read_content

What does the read_content tool do? +

Fetch specific content from a book using epub:// URL. Dynamically converts EPUB/PDF to text if needed. It is categorised as a Read tool in the Calibre MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on read_content? +

Register the Calibre MCP server in PolicyLayer and add a rule for read_content: 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 Calibre. Nothing to install.

What risk level is read_content? +

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

Can I rate-limit read_content? +

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

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

read_content is provided by the Calibre MCP server (2b3pro/calibre-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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