Get recent topics in a stream.
AI agents call get_stream_topics to retrieve information from Zulip without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves topic information from a Zulip stream. It is a read-only operation that does not create, modify, delete, or execute any actions. The blast radius of misuse is minimal—an agent could only obtain information about stream topics, which are typically not sensitive in the context of Zulip's collaborative messaging platform.
From the tool's definition Tool name 'get_stream_topics' and description 'Get recent topics in a stream' indicate a data retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_stream_topics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Zulip, and nothing reaches the server without passing your rules. This is the rule we recommend for get_stream_topics:
{
"version": "1",
"default": "deny",
"tools": {
"get_stream_topics": {}
}
}get_stream_topics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get recent topics in a stream. It is categorised as a Read tool in the Zulip MCP Server, which means it retrieves data without modifying state.
Register the Zulip MCP server in PolicyLayer and add a rule for get_stream_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 Zulip. Nothing to install.
get_stream_topics is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_stream_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.
Set action: deny in the PolicyLayer policy for get_stream_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.
get_stream_topics is provided by the Zulip MCP server (windborne/zulipmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Zulip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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27 Zulip tools catalogued and risk-classified — across an index of 43,000+ MCP servers.