AI agents call discord_fetch_webhook_message to retrieve information from Discord without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves webhook message metadata and content without side effects. It is a simple read operation that queries existing data. No data is written, deleted, or modified. While webhook access could theoretically enable reading sensitive messages in certain Discord configurations, the blast radius for misuse is limited to information disclosure, warranting a 'low' severity classification.
From the tool's definition Tool name contains 'fetch', description states 'Fetch a single message' which retrieves data without modification. Retrieved fields are: id, content, embed count, timestamp—all informational. No creation, modification, deletion, or execution involved.
Attacks that exploit this kind of access
Fetch a single message sent through a webhook (id, content, embed count, timestamp), using the webhook. It is categorised as a Read tool in the Discord MCP Server, which means it retrieves data without modifying state.
Register the Discord MCP server in PolicyLayer and add a rule for discord_fetch_webhook_message: 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 Discord. Nothing to install.
discord_fetch_webhook_message 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 discord_fetch_webhook_message 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 discord_fetch_webhook_message. 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.
discord_fetch_webhook_message is provided by the Discord MCP server (@pasympa/discord-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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