slack_lists_download_start · Slack MCP: Risk & Policy

WHAT IT DOES

What slack_lists_download_start does on Slack

AI agents invoke slack_lists_download_start to trigger actions in Slack. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why slack_lists_download_start needs a policy

The tool initiates a download operation, which is an external process/action rather than a simple data retrieval. It starts an asynchronous operation with side effects. Confidence is moderate because the description is minimal and the exact mechanism is unclear, but 'start' implies triggering an operation rather than passively reading data.

From the tool's definition 'Start a list download' — triggers an external operation (initiating a download process)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

slack_lists_download_start Rate-limited

slack_lists_download_start stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "slack_lists_download_start": {
      "limits": [
        {
          "counter": "slack_lists_download_start_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 slack_lists_download_start

What does the slack_lists_download_start tool do? +

Start a list download. It is categorised as a Execute tool in the Slack MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on slack_lists_download_start? +

Register the Slack MCP server in PolicyLayer and add a rule for slack_lists_download_start: 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 slack_lists_download_start? +

slack_lists_download_start is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit slack_lists_download_start? +

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

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

slack_lists_download_start 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.