gcp_pubsub_list_topics

List all Pub/Sub topics in the project

SERVERGCP MCP Server SOURCEahmedselimmansor-ctrl/gcp_mcp_server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/ahmedselimmansor-ctrl-gcp-mcp-server/gcp-pubsub-list-topics.md

WHAT IT DOES

What gcp_pubsub_list_topics does on GCP MCP Server

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

RISK

Why gcp_pubsub_list_topics is rated Low

This tool queries and returns information about existing Pub/Sub topics. It does not create, modify, delete, or execute any operations; it only reads and enumerates resources. The blast radius of misuse is minimal — an attacker gains visibility into topic names but cannot alter infrastructure or access message contents without additional privileges.

From the tool's definition Tool name includes 'list' and description states 'List all Pub/Sub topics in the project' — a pure retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gcp_pubsub_list_topics safely

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

gcp_pubsub_list_topics Allowed

gcp_pubsub_list_topics 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": {
    "gcp_pubsub_list_topics": {}
  }
}

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

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

FAQ

Questions about gcp_pubsub_list_topics

What does the gcp_pubsub_list_topics tool do? +

List all Pub/Sub topics in the project. It is categorised as a Read tool in the GCP MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on gcp_pubsub_list_topics? +

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

What risk level is gcp_pubsub_list_topics? +

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

Can I rate-limit gcp_pubsub_list_topics? +

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

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

gcp_pubsub_list_topics is provided by the GCP MCP Server MCP server (ahmedselimmansor-ctrl/gcp_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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