gcp_pubsub_pull_messages

Pull messages from a Pub/Sub subscription

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-pull-messages.md

WHAT IT DOES

What gcp_pubsub_pull_messages does on GCP MCP Server

AI agents call gcp_pubsub_pull_messages 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_pull_messages is rated Low

Pulling messages from a Pub/Sub subscription is a read-only operation that retrieves data without side effects. While pulled messages may be acknowledged/removed from the subscription by subsequent operations, the pull operation itself only queries and fetches data.

From the tool's definition Tool name 'pull_messages' and description 'Pull messages from a Pub/Sub subscription' indicate retrieval of existing data from a queue without modification, creation, deletion, or execution of external operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gcp_pubsub_pull_messages 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_pull_messages, this is the rule to start with:

gcp_pubsub_pull_messages Allowed

gcp_pubsub_pull_messages 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_pull_messages": {}
  }
}

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_pull_messages call is checked against it from then on.

FAQ

Questions about gcp_pubsub_pull_messages

What does the gcp_pubsub_pull_messages tool do? +

Pull messages from a Pub/Sub subscription. 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_pull_messages? +

Register the GCP MCP Server MCP server in PolicyLayer and add a rule for gcp_pubsub_pull_messages: 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_pull_messages? +

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

Can I rate-limit gcp_pubsub_pull_messages? +

Yes. Add a rate_limit block to the gcp_pubsub_pull_messages 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_pull_messages completely? +

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

gcp_pubsub_pull_messages 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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