# ARC-Relay

> DMARC-safe email forwarding for agents: aliases, DNS health checks, and MCP tools on your domains.

- name: com.arc-relay/mcp
- version: 1.2.0
- connection class: R1 (autonomous)
- trust: 80/100 flags: no-repository
- quality: 84/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.arc-relay%2Fmcp
- tools: https://api.protogrid.dev/v1/servers/com.arc-relay%2Fmcp/tools

**An agent can connect on its own if it already holds `ARC_RELAY_TOKEN`.** Remote endpoint behind a static API key or header. The registry never sees the value; the agent fills the placeholder.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "arc-relay": {
      "type": "http",
      "url": "https://arc-relay.com/mcp",
      "headers": {
        "Authorization": "Bearer ${ARC_RELAY_TOKEN}"
      }
    }
  }
}
```

Placeholders to fill: `${ARC_RELAY_TOKEN}`.

## Trust

- hygiene: 80
- liveness: 100
- freshness: 85
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% ~updated-53d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 84/100 (good)

### protocol: 100 (weight 25)

- pass `protocol.modern`: supports 2026-07-28 (server/discover)
- pass `protocol.stateless`: answers without a session
- pass `protocol.transport`: streamable HTTP
- pass `protocol.list_ttl`: tool list is cacheable (ttlMs 3600000)

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 6 of 6 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 548 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 25 (weight 15)

- warn `stability.changes`: 6 tool changes in 30 days
- fail `stability.rug_pull`: 1 tools kept their name but changed most of their description in 30 days; review before trusting them

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 6, about 548 tokens to load them all
- tool set hash: 273c1515ada2410e6aa0b61c1fe3dd1a
- tools last changed: 2026-10-04T07:06:34.415Z
- badge: [![protogrid quality](https://protogrid.dev/badge/com.arc-relay/mcp.svg)](https://protogrid.dev/servers/com.arc-relay/mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-04 `network_stats` changed (description, annotations) **meaning changed**
  - before: Get public relay network statistics — total nodes, active nodes, messages routed, delivery rate, DMARC pass rate.
  - after: Get public relay network statistics — total nodes, active nodes, messages routed, delivery rate, and the average DMARC rate nodes report about themselves (rates are null until there is traffic).
- 2026-10-04 `network_leaderboard` changed (annotations)
- 2026-10-04 `check_spf` changed (annotations)
- 2026-10-04 `check_health` changed (annotations)
- 2026-10-04 `check_email_health` changed (annotations)
- 2026-10-04 `check_dmarc` changed (annotations)

Full history: https://api.protogrid.dev/v1/servers/com.arc-relay%2Fmcp/changes

## Remotes

- https://arc-relay.com/mcp (streamable-http, auth api_key ${ARC_RELAY_TOKEN}, reachable true, uptime30d 1)

## Packages

_none_

## Tools (6)

- `check_dmarc`: Check a domain's DMARC, SPF, and MX records. Use this to diagnose email authentication issues.
- `check_email_health`: Get a 0-100 email health score for any domain. Checks DMARC, SPF, MX, and DKIM records and returns a letter grade (A+ to F) with actionable recommendations. Use this to audit any domain's email security posture.
- `check_health`: Check ARC-Relay service health and uptime.
- `check_spf`: Validate a domain's SPF record. Shows mechanisms, DNS lookup count, and warns if over the 10-lookup limit.
- `network_leaderboard`: View top relay nodes ranked by reputation score. Filter by region.
- `network_stats`: Get public relay network statistics — total nodes, active nodes, messages routed, delivery rate, and the average DMARC rate nodes report about themselves (rates are null until there is traffic).