pubsub.publish

PUBSUB: publish a message to a topic YOU own, fanning out a...

SERVERMcp SOURCE@2sio/mcp

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/io-github-2s-io-mcp/pubsub.publish.md

WHAT IT DOES

What pubsub.publish does on Mcp

AI agents call pubsub.publish 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.

RISK

Why pubsub.publish is rated Low

Even though pubsub.publish only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pubsub.publish 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 pubsub.publish, this is the rule to start with:

pubsub.publish Allowed

pubsub.publish 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": {
    "pubsub.publish": {}
  }
}

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 pubsub.publish call is checked against it from then on.

FAQ

Questions about pubsub.publish

What does the pubsub.publish tool do? +

PUBSUB: publish a message to a topic YOU own, fanning out a. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on pubsub.publish? +

Register the MCP server in PolicyLayer and add a rule for pubsub.publish: 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 pubsub.publish? +

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

Can I rate-limit pubsub.publish? +

Yes. Add a rate_limit block to the pubsub.publish 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 pubsub.publish completely? +

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

pubsub.publish is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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