read_multiple_files

THE RISK

Low Risk

Why read_multiple_files needs a policy

This tool retrieves file contents without side effects. It performs no creation, modification, deletion, or code execution. The efficiency benefit and batch capability do not change its fundamental nature as a read-only query operation.

From the tool's definition Tool name is 'read_multiple_files' and description states it 'Read multiple files simultaneously' and 'Returns each file'. The verb 'read' and the function of returning file contents with no modification capability indicate a retrieval operation.

Documented attack patterns abuse exactly the kind of access read_multiple_files gives an agent:

POLICY

How to control read_multiple_files

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude TypeScript MCP Servers, and nothing reaches the server without passing your rules. This is the rule we recommend for read_multiple_files:

policy.json

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

read_multiple_files is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Claude TypeScript MCP Servers — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about read_multiple_files

What does the read_multiple_files tool do? +

Read multiple files simultaneously. More efficient than reading one by one. Returns each file. It is categorised as a Read tool in the Claude TypeScript MCP Servers MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on read_multiple_files? +

Register the Claude TypeScript MCP Servers MCP server in PolicyLayer and add a rule for read_multiple_files: 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 Claude TypeScript MCP Servers. Nothing to install.

What risk level is read_multiple_files? +

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

Can I rate-limit read_multiple_files? +

Yes. Add a rate_limit block to the read_multiple_files 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_multiple_files completely? +

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

read_multiple_files is provided by the Claude TypeScript MCP Servers MCP server (ukkz/claude-ts-mcps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude TypeScript MCP Servers tool call.

Start from Claude TypeScript MCP Servers, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →