AI agents use discord_send_file to create or update resources in Discord Mcp Agent — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Discord Mcp Agent environment.
This tool creates a new message artifact (file upload) in Discord, which is a reversible write operation. It does not execute code, delete data, move money, or perform destructive actions. The severity is medium because misuse could involve sending unauthorized, sensitive, or malicious files to users, but the effects are bounded to Discord communication and the user can delete the message or block the agent.
From the tool's definition Tool description: 'Send a file to the user via Discord.' The action of sending/uploading a file constitutes data creation or modification in the Discord channel/DM context.
Documented attack patterns abuse exactly the kind of access discord_send_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Discord Mcp Agent, and nothing reaches the server without passing your rules. This is the rule we recommend for discord_send_file:
{
"version": "1",
"default": "deny",
"tools": {
"discord_send_file": {
"limits": [
{
"counter": "discord_send_file_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}discord_send_file stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Send a file to the user via Discord. It is categorised as a Write tool in the Discord Mcp Agent MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Discord Mcp Agent MCP server in PolicyLayer and add a rule for discord_send_file: 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 Mcp Agent. Nothing to install.
discord_send_file is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the discord_send_file 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_send_file. 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_send_file is provided by the Discord Mcp Agent MCP server (zebbern/discord-mcp-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Discord Mcp Agent, 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.
5 Discord Mcp Agent tools catalogued and risk-classified — across an index of 43,000+ MCP servers.