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XGuard — Agent Execution Gateway MCP Server

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XGuard — Agent Execution Gateway is listed as active in the registry but did not answer our last check. It exposes 8 tools. Last commit 8 Oct 2026.

Scoped agent execution. Server-side credentials, policy, budgets and verifiable receipts.

Uptime history 52 days of history · worst day 0%
52 days agonow
0.0%
Uptime 24h
0 of 92 checks
8
Tools
read from the server
302 ms
Response time
average over 24h
0
Stars
last commit 8 Oct 2026

What changed 90

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 27 August 2026. No other catalogue keeps this.

21 Sep a tool description was rewritten xguard_discover
20 Sep 5 tools appeared xguard_preflight, xguard_quote, xguard_secretless_call and 2 more
20 Sep 3 tool descriptions were rewritten xguard_discover, xguard_execute, xguard_get_result
20 Sep a tool changed the parameters it asks for xguard_execute
20 Sep a tool changed version
16 Sep a tool changed the parameters it asks for xguard_execute
14 Sep a tool description was rewritten xguard_execute
10 Sep 19 tools disappeared xguard_action_rail, xguard.capabilities, xguard_discovery_search and 16 more
10 Sep 3 tools appeared xguard_discover, xguard_execute, xguard_get_result
8 Sep 4 tool descriptions were rewritten xguard_egress_fetch, xguard.preflight, xguard.pricing.quote and 1 more
and 51 more, back to 27 August 2026

What the code does

We read the source, 7 d ago · tools taken from the live server · rules ccca72095570

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Executes code built at runtime apps/relay/src/execution-first-test.js:143
    for (const script of document.querySelectorAll("script")) { assert.doesNotThrow(() => new Function(script.textContent)); assert.ok(script.getAttribute("nonce")); }
Long encoded blob in source apps/relay/src/rail-entry.js:10
const LOGO_PNG_BASE64 = "iVBORw0KGgoAAAANSUhEUgAAAZAAAAGQCAYAAACAvzbMAAAMe0lEQVR42u3dwU0kS7Cw0QaNhFjQPowXYwJGYAZbJCS2mIERmIAX+NAOMKvZ0IO6uyqzMiPinN2TnvT/tyorvgz6Xr2rm9u7rx0AXOjaIwBAQAAQEAAEBAABAQABAUBAABAQAAQEAAEBAAEBQEAAEBAABAQAAQEAAQFAQAAQEAAEBAABAQABAUBAABAQAAQEAAEBAAEBQEAAEBA…

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

run in your terminal
claude mcp add xguard-control-plane --transport http https://api.xguardgate.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "xguard-control-plane": {
      "url": "https://api.xguardgate.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.xguard-control-plane]
url = "https://api.xguardgate.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "xguard-control-plane": {
      "url": "https://api.xguardgate.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "xguard-control-plane": {
      "url": "https://api.xguardgate.com/mcp"
    }
  }
}

Available tools 8

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

xguard
xguard_discover
Find the paid API catalog and buying instructions, plus explicit provider operations and input schemas.
xguard_execute
Execute an explicit scoped provider operation, or a supported public-source outcome. intent:demo is free. Never infer a mutation from ambiguous text.
xguard_get_result
Recover a paid public outcome with its payment identifier and original signed quote without execution or another payment.
xguard_preflight
Inspect validation, scope and remaining capability budget without reserving, billing or executing. Execution rechecks everything.
xguard_quote
Inspect XGuard credit pricing for a capability, or obtain a signed x402 quote for a public outcome. Does not execute.
xguard_secretless_call
Call an allowed provider operation with a capability. Enforces scope, call/credit budget and billing before server-side credential injection. Writes require idempotency_key.
xguard_status
Read observed execution/MCP metrics and configuration; empty observations do not imply uptime.
xguard_verify_receipt
Verify a ProofRail proof and optionally its bound x402 receipt and result digest. Signature validity does not prove source truth.

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

xguard_action_rail
removed 10 Sep 2026
xguard.capabilities
removed 10 Sep 2026
xguard_discovery_search
removed 10 Sep 2026
xguard_egress_fetch
removed 10 Sep 2026
xguard_facilitator
removed 10 Sep 2026
xguard_health
removed 10 Sep 2026
xguard_inspect
removed 10 Sep 2026
xguard_integration
removed 10 Sep 2026
xguard.preflight
removed 10 Sep 2026
xguard.pricing.quote
removed 10 Sep 2026
xguard_proofrail
removed 10 Sep 2026
xguard_protocols
removed 10 Sep 2026
xguard_receipt
removed 10 Sep 2026
xguard_route
removed 10 Sep 2026
xguard_safety_test
removed 10 Sep 2026
xguard_secretless_egress
removed 10 Sep 2026
xguard_supported
removed 10 Sep 2026
xguard_verify_proof
removed 10 Sep 2026
xguard.web.fetch
removed 10 Sep 2026

Endpoints

URLTransportStateLatencyChecked
https://api.xguardgate.com/mcp streamable-http answering 302 ms 11 min ago

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XGuard — Agent Execution Gateway — questions

Answers built from our own checks of this server.

What can XGuard — Agent Execution Gateway do?
It exposes 8 tools, read directly from the server on our last check. Among them: xguard_discover, xguard_execute, xguard_get_result, xguard_preflight, xguard_quote, xguard_secretless_call and 2 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is XGuard — Agent Execution Gateway working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 92 checks got a reply (0.0%), average response time 302 ms. The bar chart above shows every period we have measured.
Did XGuard — Agent Execution Gateway ever remove tools?
Yes. xguard_action_rail, xguard.capabilities, xguard_discovery_search, xguard_egress_fetch and 15 more are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.
The registry lists XGuard — Agent Execution Gateway as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect XGuard — Agent Execution Gateway?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does XGuard — Agent Execution Gateway need an API key?
No. XGuard — Agent Execution Gateway completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 8 of them are readable on this page. This is what we observed, not what the docs claim.
Is XGuard — Agent Execution Gateway open source?
We cannot say either way: written in JavaScript, 0 stars on GitHub and 41 open issues, but we could not determine the licence, and without one the code is not open source by default.