assistant_threads_set_title · Slack MCP: Risk & Policy

WHAT IT DOES

What assistant_threads_set_title does on Slack

AI agents use assistant_threads_set_title 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 assistant_threads_set_title needs a policy

This tool modifies thread metadata (title) in a reversible manner. While the change could affect how conversations are organized or understood by workspace members, the modification is non-destructive and can be easily changed back. Classified as Write rather than Execute because it directly modifies a specific field rather than running arbitrary code.

From the tool's definition Tool performs 'Set the title' action on an existing resource (AI assistant thread), which is a reversible modification operation. The description explicitly indicates modification of thread metadata without deletion or financial impact.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

assistant_threads_set_title Rate-limited

assistant_threads_set_title 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": {
    "assistant_threads_set_title": {
      "limits": [
        {
          "counter": "assistant_threads_set_title_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 assistant_threads_set_title

What does the assistant_threads_set_title tool do? +

Set the title for an AI assistant thread. 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 assistant_threads_set_title? +

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

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

Can I rate-limit assistant_threads_set_title? +

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

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

assistant_threads_set_title 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.