x_federation_join

SERVERHamza Agent Hub 252 SOURCEhamzachallenge3-dev/hamza-agent-hub-252

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/hamza-agent-hub-252/x-federation-join.md

WHAT IT DOES

What x_federation_join does on Hamza Agent Hub 252

AI agents call x_federation_join to retrieve information from Hamza Agent Hub 252 without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why x_federation_join is rated Low

Even though x_federation_join only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs x_federation_join safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Hamza Agent Hub 252, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For x_federation_join, this is the rule to start with:

x_federation_join Allowed

x_federation_join is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "x_federation_join": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Hamza Agent Hub 252, apply this rule, and every x_federation_join call is checked against it from then on.

FAQ

Questions about x_federation_join

What does the x_federation_join tool do? +

Join the federation with YOUR OWN local key, without an invite when public registration is enabled. Reuses ~/.ruflo/nostr.key (0600), proves key ownership with NIP-98, and verifies membership with NIP-42. Use when a user wants to join as themselves. Publishing as the gateway is wrong for personal identity. Optional private invite codes remain supported; never share keys or codes in chat. It is categorised as a Read tool in the Hamza Agent Hub 252 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on x_federation_join? +

Register the Hamza Agent Hub 252 MCP server in PolicyLayer and add a rule for x_federation_join: 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 Hamza Agent Hub 252. Nothing to install.

What risk level is x_federation_join? +

x_federation_join is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit x_federation_join? +

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

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

x_federation_join is provided by the Hamza Agent Hub 252 MCP server (hamzachallenge3-dev/hamza-agent-hub-252). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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