stream_read

A read tool on the AWS MCP server.

SERVERAWS SOURCE@awslabs/mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/aws/stream-read.md

WHAT IT DOES

What stream_read does on AWS

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

RISK

Why stream_read is rated Low

The name 'stream_read' strongly suggests a retrieval operation with no side effects. However, confidence is moderate (0.7) rather than high because the description is empty, and without it, the exact scope and blast radius cannot be fully determined. The context of AWS tools and siblings like 'audit_' functions suggests this is likely a benign read operation.

From the tool's definition Tool name 'stream_read' indicates a read operation on a stream or data source. No destructive, write, or execute keywords present.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs stream_read safely

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

stream_read Allowed

stream_read 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": {
    "stream_read": {}
  }
}

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

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

FAQ

Questions about stream_read

What does the stream_read tool do? +

stream_read is a read tool on the AWS MCP server. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on stream_read? +

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

What risk level is stream_read? +

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

Can I rate-limit stream_read? +

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

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

stream_read is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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