list_stream_objects

SERVERMcp SOURCEhttps://datastream.googleapis.com/mcp

Low RISK CLASS

Category Read

Parameters 31 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/com-googleapis-datastream-mcp/list-stream-objects.md

WHAT IT DOES

What list_stream_objects does on Mcp

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

Parameter	Type	Required	Description
`parent`	string	Yes	Required. The parent stream that owns the collection of objects.
`pageSize`	integer	—	Optional. Maximum number of objects to return. Default is 50. The maximum value is 1000; values above 1000 will be coerced to 1000.
`pageToken`	string	—	Optional. Page token received from a previous `ListStreamObjectsRequest` call. Provide this to retrieve the subsequent page. When paginating, all other paramete

Parameters from the server's own tool schema.

RISK

Why list_stream_objects is rated Low

The tool performs a query operation that retrieves metadata about stream objects without side effects. It does not create, modify, delete, execute code, or trigger external operations. The parent parameter requirement indicates read-only resource navigation. This is a standard data retrieval function with minimal blast radius if misused.

From the tool's definition Tool description states it 'Lists stream objects in a given stream' and 'Not all the details of the stream objects are returned.' This is a listing/retrieval operation with no modification or execution of external operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_stream_objects safely

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

list_stream_objects Allowed

list_stream_objects 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": {
    "list_stream_objects": {}
  }
}

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

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

FAQ

Questions about list_stream_objects

What does the list_stream_objects tool do? +

Lists stream objects in a given stream. * Parent parameter is in the form 'projects/{project name}/locations/{location}/streams/{stream name}', for example: 'projects/my-project/locations/us-central1/streams/my-stream'. * Not all the details of the stream objects are returned. * To get the full details of a specific stream object, use the 'get_stream_object' tool. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.

What parameters does list_stream_objects accept? +

list_stream_objects accepts 3 parameters: parent, pageSize, pageToken. Required: parent. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on list_stream_objects? +

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

What risk level is list_stream_objects? +

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

Can I rate-limit list_stream_objects? +

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

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

list_stream_objects is provided by the MCP server (https://datastream.googleapis.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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