// MCP TOOL REFERENCE

sint__show_hud

ServerSINT Protocol
CategoryExecute

WHAT IT DOES

What sint__show_hud does on SINT Protocol

AI agents invoke sint__show_hud to trigger actions in SINT Protocol. 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.

THE RISK

High Risk

Why sint__show_hud needs a policy

The tool triggers an external UI operation (rendering/refreshing a panel in the live operator interface), which is an action with a side effect beyond simple data retrieval. However, since it explicitly states it does not persist business data and only updates a display panel, the blast radius is minimal.

From the tool's definition 'Show or refresh one HUD panel in the operator interface' and 'updates the live interface but does not persist business data'

Documented attack patterns abuse exactly the kind of access sint__show_hud gives an agent:

POLICY

How to control sint__show_hud

PolicyLayer is an MCP gateway — it sits between your AI agents and SINT Protocol, and nothing reaches the server without passing your rules. This is the rule we recommend for sint__show_hud:

policy.json

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

sint__show_hud 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.

Create a free account and register SINT Protocol — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

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Go deeper

High-risk tools in SINT Protocol → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about sint__show_hud

What does the sint__show_hud tool do? +

Show or refresh one HUD panel in the operator interface. Use this to surface approvals, audit details, context, or memory on screen; this updates the live interface but does not persist business data. Returns a JSON confirmation describing which panel was updated and when. It is categorised as a Execute tool in the SINT Protocol MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on sint__show_hud? +

Register the SINT Protocol MCP server in PolicyLayer and add a rule for sint__show_hud: 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 SINT Protocol. Nothing to install.

What risk level is sint__show_hud? +

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

Can I rate-limit sint__show_hud? +

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

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

sint__show_hud is provided by the SINT Protocol MCP server (sint-ai/sint-protocol). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SINT Protocol tool call.

Start from SINT Protocol, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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21 SINT Protocol tools catalogued and risk-classified — across an index of 43,000+ MCP servers.