Get messages from a channel with pagination.
AI agents call get_channel_messages to retrieve information from Open WebUI 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/queries existing message data from a channel with pagination support. It performs no mutations, deletions, or external operations. The action is passive data access with no blast radius if misused—an agent could only read messages they have access to, consistent with the server's respect for 'native permission and authentication systems.' Low severity appropriate for read-only operations.
From the tool's definition Tool name 'get_channel_messages' and description 'Get messages from a channel with pagination' indicate data retrieval without modification or side effects.
Documented attack patterns abuse exactly the kind of access get_channel_messages gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Open WebUI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_channel_messages:
{
"version": "1",
"default": "deny",
"tools": {
"get_channel_messages": {}
}
}get_channel_messages is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get messages from a channel with pagination. It is categorised as a Read tool in the Open WebUI MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Open WebUI MCP Server MCP server in PolicyLayer and add a rule for get_channel_messages: 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 Open WebUI MCP Server. Nothing to install.
get_channel_messages 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_channel_messages 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_channel_messages. 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_channel_messages is provided by the Open WebUI MCP Server MCP server (troylar/open-webui-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Open WebUI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
82 Open WebUI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.