files_edit · Slack MCP: Risk & Policy

WHAT IT DOES

What files_edit does on Slack

AI agents use files_edit to create or update resources in Slack — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Slack environment.

WHY IT NEEDS A POLICY

Why files_edit needs a policy

This tool modifies file content in Slack, which is a reversible change (Write category). Severity is high because files in Slack are often used for important documentation, code, or sensitive information; unauthorized editing could corrupt data or enable unauthorized information modification. The 'legacy undocumented' note increases risk by suggesting the tool may not have modern security safeguards.

From the tool's definition Tool name 'files_edit' and description 'Edit a file' indicate modification of existing data. Described as 'legacy undocumented', suggesting it may lack proper access controls or validation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

files_edit Rate-limited

files_edit 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "files_edit": {
      "limits": [
        {
          "counter": "files_edit_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Slack, so you can run agents against it safely.

FAQ

Questions about files_edit

What does the files_edit tool do? +

Edit a file (legacy undocumented). It is categorised as a Write tool in the Slack MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on files_edit? +

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

What risk level is files_edit? +

files_edit is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit files_edit? +

Yes. Add a rate_limit block to the files_edit 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 files_edit completely? +

Set action: deny in the PolicyLayer policy for files_edit. 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 files_edit? +

files_edit is provided by the Slack MCP server (karbassi/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.