Agent Arena Registry

io.github.smukh/agent-arenasmukhstreamable-httpv1.0.0Scanned 22 hours ago

On-chain ERC-8004 agent registry. Search, register, and check reputation across 16 chains.

3 tools: 1 change things and 2 only read.

Reads private data · 0
Reads text others write · 0
Can send data out · 0
1 finding

Tools listed without sign-in. Remote posture

Anlyon alternative

1 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

3 tools

Changes things 1Creates or changes something that can be changed back.Claude Code: ask

register_agentRegister a new AI agent on the Base blockchain ERC-8004 registry.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
Register a new AI agent on the Base blockchain ERC-8004 registry. Mints an on-chain identity NFT and indexes the agent for discovery. Requires $0.05 USDC payment via x402 on Base mainnet.

Only reads 2Looks things up and changes nothing.Show 2 read-only tools

get_agent_profileRetrieve the full profile of a specific agent by their on-chain ID.No findings
Why it is in this group
- The name "get_agent_profile" says "get": a word for reading.
Description, as the server wrote it
Retrieve the full profile of a specific agent by their on-chain ID. Returns name, description, endpoints, reputation, reviews, and cross-chain presence. Free endpoint.
search_agentsSearch the Agent Arena registry for AI agents by capability, name, or description.1 finding
Why it is in this group
- The name "search_agents" says "search": a word for reading.
Findings
- Info
  The input schema at properties.acta.description mentions "credential".
  Matched text
  inputSchema.properties.acta.description: "...y return agents with ACTA-ready private credential metadata"
  What this check looks for
Description, as the server wrote it
Search the Agent Arena registry for AI agents by capability, name, or description. Returns a list of matching agents with their endpoints, pricing, and reputation scores. Requires $0.005 USDC payment via x402 on Base mainnet.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Oct 22, 2026, 15:05 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 1
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 1 tool that changes things (1 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://agentarena.site/api/mcp: tools/list returned 3 tools to an anonymous client, including register_agent (write)
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

1 info

Infosearch_agents
The input schema at properties.acta.description mentions "credential".
Matched text
inputSchema.properties.acta.description: "...y return agents with ACTA-ready private credential metadata"
What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http agent-arena https://agentarena.site/api/mcp

claude mcp add --transport http agent-arena https://agentarena.site/api/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__agent-arena__search_agents",
      "mcp__agent-arena__get_agent_profile"
    ],
    "ask": [
      "mcp__agent-arena__register_agent"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as agent-arena. Review it before you use it.

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.github.smukh/agent-arena/verify?hash=70e27c8436244b23bf5e270484b08a8cae2d9b08d387148b2aca26175825df68" | jq -e '.changed == false'

Pinned hash 70e27c843624, from Oct 21, 2026, 19:27 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.smukh/agent-arena/changes.xml

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Badge

[![anlyon.dev](https://anlyon.dev/badge/io.github.smukh/agent-arena.svg)](https://anlyon.dev/servers/io.github.smukh/agent-arena)

Source: MCP Registry · repository. Synced Oct 21, 2026, 18:49 UTC.