gcp_pubsub_publish_message

Publish a message to a Pub/Sub topic

SERVERGCP MCP Server SOURCEahmedselimmansor-ctrl/gcp_mcp_server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What gcp_pubsub_publish_message does on GCP MCP Server

AI agents use gcp_pubsub_publish_message to create or update resources in GCP MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GCP MCP Server environment.

RISK

Why gcp_pubsub_publish_message is rated Medium

Publishing a message to Pub/Sub creates a new message object that persists in the topic until consumed or expired. This is a write operation (data creation) with reversible effects—messages can be acknowledged and removed. It is not destructive (messages are not permanently deleted), not financial, and not arbitrary code execution.

From the tool's definition Tool name 'publish_message' and description 'Publish a message to a Pub/Sub topic' indicate creation/insertion of data into a message queue system.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gcp_pubsub_publish_message 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_publish_message, this is the rule to start with:

gcp_pubsub_publish_message Rate-limited

gcp_pubsub_publish_message stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gcp_pubsub_publish_message": {
      "limits": [
        {
          "counter": "gcp_pubsub_publish_message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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_publish_message call is checked against it from then on.

FAQ

Questions about gcp_pubsub_publish_message

What does the gcp_pubsub_publish_message tool do? +

Publish a message to a Pub/Sub topic. It is categorised as a Write tool in the GCP MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gcp_pubsub_publish_message? +

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

gcp_pubsub_publish_message is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit gcp_pubsub_publish_message? +

Yes. Add a rate_limit block to the gcp_pubsub_publish_message 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_publish_message completely? +

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

gcp_pubsub_publish_message 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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