publish_reader_bundle · Pdf Card MCP: Risk & Policy

WHAT IT DOES

What publish_reader_bundle does on Pdf Card

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

WHY IT NEEDS A POLICY

Why publish_reader_bundle needs a policy

The 'publish' action most likely creates or distributes a bundle (Write category), potentially with side effects like uploading to a server or creating persistent outputs. Without a description, confidence is reduced and severity is assessed as medium since the blast radius depends on where/how widely the bundle is published and whether it's reversible.

From the tool's definition Tool name 'publish_reader_bundle' combined with server context of card-based HTML readers suggests creating or deploying bundled reader output.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

publish_reader_bundle Rate-limited

publish_reader_bundle 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": {
    "publish_reader_bundle": {
      "limits": [
        {
          "counter": "publish_reader_bundle_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Pdf Card, so you can run agents against it safely.

FAQ

Questions about publish_reader_bundle

What does the publish_reader_bundle tool do? +

publish_reader_bundle. It is categorised as a Write tool in the Pdf Card MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on publish_reader_bundle? +

Register the Pdf Card MCP server in PolicyLayer and add a rule for publish_reader_bundle: 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 Pdf Card. Nothing to install.

What risk level is publish_reader_bundle? +

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

Can I rate-limit publish_reader_bundle? +

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

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

publish_reader_bundle is provided by the Pdf Card MCP server (velyan/pdf-card-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.