AI agents call listTaggedChannels 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 queries and returns information about tagged channels without creating, modifying, or deleting any data. It is a simple listing/retrieval operation analogous to a search or filter on existing channel metadata. The low severity reflects minimal risk even if misused by an AI agent, as it only exposes channel metadata the agent likely already has access to within a Telegram context.
From the tool's definition Tool name 'listTaggedChannels' and description 'List channels that carry a specific tag' indicate data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access listTaggedChannels 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 listTaggedChannels:
{
"version": "1",
"default": "deny",
"tools": {
"listTaggedChannels": {}
}
}listTaggedChannels is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List channels that carry a specific tag. 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 listTaggedChannels: 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.
listTaggedChannels 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 listTaggedChannels 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 listTaggedChannels. 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.
listTaggedChannels 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.