# list_stream_objects

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.

Agent View of the PolicyLayer registry record for `list_stream_objects`. HTML page: https://policylayer.com/tools/com-googleapis-datastream-mcp/list-stream-objects

## Facts

- Tool: `list_stream_objects`
- Server: Mcp (`https://datastream.googleapis.com/mcp`) — https://policylayer.com/tools/com-googleapis-datastream-mcp.md
- Homepage: https://github.com/https://datastream.googleapis.com/mcp
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 3 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `parent` | string | yes | Required. The parent stream that owns the collection of objects. |
| `pageSize` | integer | no | 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 | no | 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.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "list_stream_objects",
    "arguments": {
      "parent": "<parent>"
    }
  }
}
```

## 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 own 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."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Mcp:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_stream_objects": {}
  }
}
```

## Other tools on Mcp (9)

- `delete_stream` — Destructive — https://policylayer.com/tools/com-googleapis-datastream-mcp/delete-stream.md
- `run_stream` — Execute — https://policylayer.com/tools/com-googleapis-datastream-mcp/run-stream.md
- `get_operation` — Read — https://policylayer.com/tools/com-googleapis-datastream-mcp/get-operation.md
- `get_stream` — Read — https://policylayer.com/tools/com-googleapis-datastream-mcp/get-stream.md
- `get_stream_object` — Read — https://policylayer.com/tools/com-googleapis-datastream-mcp/get-stream-object.md
- `list_connection_profiles` — Read — https://policylayer.com/tools/com-googleapis-datastream-mcp/list-connection-profiles.md
- `list_static_ips` — Read — https://policylayer.com/tools/com-googleapis-datastream-mcp/list-static-ips.md
- `list_streams` — Read — https://policylayer.com/tools/com-googleapis-datastream-mcp/list-streams.md
- `lookup_stream_object` — Read — https://policylayer.com/tools/com-googleapis-datastream-mcp/lookup-stream-object.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=com-googleapis-datastream-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/com-googleapis-datastream-mcp