signNostrEvent · Nostr Tools for AI Agents MCP

WHAT IT DOES

What signNostrEvent does on Nostr Tools for AI Agents

AI agents invoke signNostrEvent to trigger actions in Nostr Tools for AI Agents. 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 signNostrEvent needs a policy

Signing a Nostr event is an active cryptographic operation that authorizes and commits an event for publication on the Nostr network. While it doesn't directly publish (that would be a separate step), it executes the signing process using private key material, enabling subsequent broadcast.

From the tool's definition Sign any unsigned Nostr event

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

signNostrEvent Rate-limited

signNostrEvent 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": {
    "signNostrEvent": {
      "limits": [
        {
          "counter": "signnostrevent_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 Nostr Tools for AI Agents, so you can run agents against it safely.

FAQ

Questions about signNostrEvent

What does the signNostrEvent tool do? +

Sign any unsigned Nostr event. It is categorised as a Execute tool in the Nostr Tools for AI Agents MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on signNostrEvent? +

Register the Nostr Tools for AI Agents MCP server in PolicyLayer and add a rule for signNostrEvent: 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 Nostr Tools for AI Agents. Nothing to install.

What risk level is signNostrEvent? +

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

Can I rate-limit signNostrEvent? +

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

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

signNostrEvent is provided by the Nostr Tools for AI Agents MCP server (jorgenclaw/nostr-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.