# StealthStack ARD Discovery

> Search a public index of agents, MCP servers and skills found on the open web. Free, no auth.

- name: ai.stealthstack/discovery
- version: 0.2.0
- connection class: R0 (autonomous)
- trust: 82/100 flags: no-repository
- quality: 91/100 (strong)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/ai.stealthstack%2Fdiscovery
- tools: https://api.protogrid.dev/v1/servers/ai.stealthstack%2Fdiscovery/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "discovery": {
      "type": "http",
      "url": "https://stealthstack.ai/mcp?src=mcpregistry"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 99
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-98% +updated-23d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 91/100 (strong)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### 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`: 3 of 3 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 808 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: 3 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

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

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

- tools: 3, about 808 tokens to load them all
- tool set hash: 172c0c71815adcc69f53aa04742f33f5
- tools last changed: 2026-10-07T18:36:45.808Z
- badge: [![protogrid quality](https://protogrid.dev/badge/ai.stealthstack/discovery.svg)](https://protogrid.dev/servers/ai.stealthstack/discovery)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-07 `get_resource` changed (outputSchema)
- 2026-10-07 `list_resources` changed (description, inputSchema, outputSchema)
  - before: Browse the StealthStack ARD index — agentic resources (agents, MCP servers, skills, catalogs) discovered across the open web. Optionally filter by kind, domain, or trust. Returns a count, a kind breakdown, and the page of resources, each with its connect URL when the publisher provides one; otherwise the inline connection or pull details. Use search_resources for a specific need.
  - after: Browse the StealthStack ARD index — agentic resources (agents, MCP servers, skills, catalogs) discovered across the open web. Optionally filter by kind, domain, trust, or accepted payment protocol (paid=x402). Returns a count, a kind breakdown, and the page of resources, each with its connect URL when the publisher provides one; otherwise the inline connection or pull details. Use search_resources for a specific need.
- 2026-10-07 `search_resources` changed (description, inputSchema, outputSchema)
  - before: Search the StealthStack ARD index for agentic resources (agents, MCP servers, skills, catalogs) discovered across the open web. Free-text query over name/description/tags, ranked by the index's relevance score (best match first). Optionally filter by kind, domain, or trust. Each result includes the connect URL when the publisher provides one; otherwise the inline connection or pull details.
  - after: Search the StealthStack ARD index for agentic resources (agents, MCP servers, skills, catalogs) discovered across the open web. Free-text query over name/description/tags, ranked by the index's relevance score (best match first). Optionally filter by kind, domain, trust, or accepted payment protocol (paid=x402). Each result includes the connect URL when the publisher provides one; otherwise the inline connection or pull details.

Full history: https://api.protogrid.dev/v1/servers/ai.stealthstack%2Fdiscovery/changes

## Remotes

- https://stealthstack.ai/mcp?src=mcpregistry (streamable-http, auth none, reachable true, uptime30d 0.978022)

## Packages

_none_

## Tools (3)

- `get_resource`: Get the full record for one discovered ARD resource by its identifier (URN), as returned by search_resources / list_resources. Includes the connect URL when the publisher provides one; otherwise the inline connection or pull details. Also returns type, publisher, version, trust, source, description, tags, and example queries.
- `list_resources`: Browse the StealthStack ARD index — agentic resources (agents, MCP servers, skills, catalogs) discovered across the open web. Optionally filter by kind, domain, trust, or accepted payment protocol (paid=x402). Returns a count, a kind breakdown, and the page of resources, each with its connect URL when the publisher provides one; otherwise the inline connection or pull details. Use search_resources for a specific need.
- `search_resources`: Search the StealthStack ARD index for agentic resources (agents, MCP servers, skills, catalogs) discovered across the open web. Free-text query over name/description/tags, ranked by the index's relevance score (best match first). Optionally filter by kind, domain, trust, or accepted payment protocol (paid=x402). Each result includes the connect URL when the publisher provides one; otherwise the inline connection or pull details.