AI agents call topicsList to retrieve information from Telegram MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates forum topics within a Telegram supergroup. It performs a read-only query operation that returns information without modifying, deleting, or executing any actions. No data is created, modified, deleted, or irreversibly changed. The blast radius of misuse is minimal—an agent could retrieve unwanted topic listings but cannot affect system state or cause harm through this tool alone.
From the tool's definition Tool name 'topicsList' and description 'Lists forum topics for a supergroup' indicate a query/retrieval operation with no side effects. The verb 'Lists' confirms data retrieval.
Documented attack patterns abuse exactly the kind of access topicsList gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Telegram MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for topicsList:
{
"version": "1",
"default": "deny",
"tools": {
"topicsList": {}
}
}topicsList is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists forum topics for a supergroup. It is categorised as a Read tool in the Telegram MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Telegram MCP Server MCP server in PolicyLayer and add a rule for topicsList: 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 Telegram MCP Server. Nothing to install.
topicsList 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 topicsList 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 topicsList. 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.
topicsList is provided by the Telegram MCP Server MCP server (kfastov/tgcli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Telegram MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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38 Telegram MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.