prior_for_turn · Sovereign Stack MCP: Risk & Policy

WHAT IT DOES

What prior_for_turn does on Sovereign Stack

AI agents invoke prior_for_turn to trigger actions in Sovereign Stack. 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 prior_for_turn needs a policy

prior_for_turn triggers real processes with real consequences. An agent gone sideways doesn't fire it once — it starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

prior_for_turn Rate-limited

prior_for_turn 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": {
    "prior_for_turn": {
      "limits": [
        {
          "counter": "prior_for_turn_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 Sovereign Stack, so you can run agents against it safely.

FAQ

Questions about prior_for_turn

What does the prior_for_turn tool do? +

Turn-start reflex. Call at the start of a turn (not session) to receive a compact priors. It is categorised as a Execute tool in the Sovereign Stack MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on prior_for_turn? +

Register the Sovereign Stack MCP server in PolicyLayer and add a rule for prior_for_turn: 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 Sovereign Stack. Nothing to install.

What risk level is prior_for_turn? +

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

Can I rate-limit prior_for_turn? +

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

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

prior_for_turn is provided by the Sovereign Stack MCP server (templetwo/sovereign-stack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.