# MCP Auth Preflight

> Preflight MCP OAuth compatibility with structured evidence and remediation guidance.

- name: us.inversolabs/mcp-auth-preflight
- version: 0.1.19
- connection class: unknown (unknown)
- trust: 47/100 flags: no-repository
- quality: 84/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/us.inversolabs%2Fmcp-auth-preflight
- tools: https://api.protogrid.dev/v1/servers/us.inversolabs%2Fmcp-auth-preflight/tools

**Not classified yet.** The remote endpoints have not been probed successfully, or the listing has nothing to connect to.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "mcp-auth-preflight": {
      "type": "http",
      "url": "https://auth.inversolabs.us/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 0
- freshness: 85
- provenance: 45
- drivers: +dns-namespace -unreachable(2 failures) ~updated-55d-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 300000)

### 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: 71 (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
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: mcp_auth_compatibility_preflight (readOnlyHint, destructiveHint, idempotentHint, openWorldHint)
- pass `tools.token_cost`: about 181 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

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

- n/a `stability.changes`, `stability.rug_pull`: tool history recorded for 1 of the 7 days needed

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

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

- tools: 1, about 181 tokens to load them all
- tool set hash: b9675b27cd84caf42ca8e6b7ef98225d
- badge: [![protogrid quality](https://protogrid.dev/badge/us.inversolabs/mcp-auth-preflight.svg)](https://protogrid.dev/servers/us.inversolabs/mcp-auth-preflight)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://auth.inversolabs.us/mcp (streamable-http, auth none, reachable false, uptime30d 0.13333334)

## Packages

_none_

## Tools (1)

- `mcp_auth_compatibility_preflight`: Validate MCP protected-resource and OAuth authorization-server metadata; diagnose PKCE and client compatibility; and predict interoperability failures before connecting, without accepting credentials.