set_trust_score · Agent-Comm-Hub MCP: Risk & Policy

WHAT IT DOES

What set_trust_score does on Agent-Comm-Hub

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

WHY IT NEEDS A POLICY

Why set_trust_score needs a policy

This tool creates or modifies data reversibly by adjusting trust scores in the system. While the impact on collective memory ranking could influence agent behavior, the action itself is reversible (trust scores can be adjusted up or down).

From the tool's definition Tool description (translated): 'Adjust Agent trust score (incremental adjustment from -100 to +100). Trust score affects collective memory search ordering; high-trust agents' memories rank higher.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_trust_score Rate-limited

set_trust_score 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": {
    "set_trust_score": {
      "limits": [
        {
          "counter": "set_trust_score_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 Agent-Comm-Hub, so you can run agents against it safely.

FAQ

Questions about set_trust_score

What does the set_trust_score tool do? +

调整 Agent 信任分（-100 到 +100 的增量）。信任分影响 collective 记忆搜索排序，高信任 Agent 的记忆排名靠前。仅 admin 可调用。. It is categorised as a Write tool in the Agent-Comm-Hub MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_trust_score? +

Register the Agent-Comm-Hub MCP server in PolicyLayer and add a rule for set_trust_score: 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 Agent-Comm-Hub. Nothing to install.

What risk level is set_trust_score? +

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

Can I rate-limit set_trust_score? +

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

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

set_trust_score is provided by the Agent-Comm-Hub MCP server (liuboacean/agent-comm-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.