mt_skill_issue_vc · MolTrust MCP Server MCP: Risk & Policy

WHAT IT DOES

What mt_skill_issue_vc does on MolTrust MCP Server

AI agents use mt_skill_issue_vc to create or update resources in MolTrust MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MolTrust MCP Server environment.

WHY IT NEEDS A POLICY

Why mt_skill_issue_vc needs a policy

Issuing verifiable credentials is a Write operation—it creates and registers new cryptographic claims that modify trust state. While reversible (unlike Destructive), this has real-world consequences for agent reputation and access control.

From the tool's definition Tool name 'mt_skill_issue_vc' contains 'issue' paired with 'vc' (verifiable credential). Server context confirms it issues verifiable credentials (sibling tool 'moltguard_credential_issue' explicitly issues credentials).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mt_skill_issue_vc Rate-limited

mt_skill_issue_vc 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": {
    "mt_skill_issue_vc": {
      "limits": [
        {
          "counter": "mt_skill_issue_vc_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MolTrust MCP Server, so you can run agents against it safely.

FAQ

Questions about mt_skill_issue_vc

What does the mt_skill_issue_vc tool do? +

mt_skill_issue_vc. It is categorised as a Write tool in the MolTrust MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mt_skill_issue_vc? +

Register the MolTrust MCP Server MCP server in PolicyLayer and add a rule for mt_skill_issue_vc: 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 MolTrust MCP Server. Nothing to install.

What risk level is mt_skill_issue_vc? +

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

Can I rate-limit mt_skill_issue_vc? +

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

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

mt_skill_issue_vc is provided by the MolTrust MCP Server MCP server (pypi:moltrust-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.