read_message_attachment

SERVERGuildControl MCP SOURCEguildctl

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/app-lasers-guildcontrol-discord/read-message-attachment.md

WHAT IT DOES

What read_message_attachment does on GuildControl MCP

AI agents call read_message_attachment to retrieve information from GuildControl MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why read_message_attachment is rated Low

Tool retrieves message attachments with no side effects, comprehensive safety controls, and no data modification or deletion.

From the tool's definition Read one exact attachment from one exact message; refetches current Discord evidence; persists nothing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs read_message_attachment safely

PolicyLayer is an MCP gateway: it sits between your AI agents and GuildControl MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For read_message_attachment, this is the rule to start with:

read_message_attachment Allowed

read_message_attachment is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "read_message_attachment": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect GuildControl MCP, apply this rule, and every read_message_attachment call is checked against it from then on.

FAQ

Questions about read_message_attachment

What does the read_message_attachment tool do? +

Read one exact attachment from one exact message in a permitted guild channel or thread as a native MCP image or audio block, with an embedded octet-stream fallback and an equivalent private resource link. The connector refetches current Discord evidence, validates the signed CDN route, refuses redirects and credentials, enforces the configured MCP response budget while streaming, verifies supported media signatures, persists nothing, omits delivery URLs and raw payloads from metadata, and wipes transient bytes after encoding. It is categorised as a Read tool in the GuildControl MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on read_message_attachment? +

Register the GuildControl MCP server in PolicyLayer and add a rule for read_message_attachment: 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 GuildControl MCP. Nothing to install.

What risk level is read_message_attachment? +

read_message_attachment is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit read_message_attachment? +

Yes. Add a rate_limit block to the read_message_attachment 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.

How do I block read_message_attachment completely? +

Set action: deny in the PolicyLayer policy for read_message_attachment. 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.

What MCP server provides read_message_attachment? +

read_message_attachment is provided by the GuildControl MCP server (guildctl). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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