# Preflight (remote · preflight.allthepossibles.com)

Scans an MCP server for security gaps before your agent connects. Free tier, no signup.

- Trust score: 70/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-23

## Components

- remote · `preflight.allthepossibles.com`: 70/100 (this document), [markdown](https://verifymcp.io/servers/com-allthepossibles-preflight/preflight.md), [page](https://verifymcp.io/servers/com-allthepossibles-preflight/preflight)

## Channel facts

- Endpoint: `https://preflight.allthepossibles.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-23.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 72/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 602 tokens (~150/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 10/100
  - Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 97/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 90% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Preflight MCP server?

Preflight is a hosted endpoint at https://preflight.allthepossibles.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-allthepossibles-preflight 'https://preflight.allthepossibles.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-allthepossibles-preflight": {
      "url": "https://preflight.allthepossibles.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-allthepossibles-preflight": {
      "type": "http",
      "url": "https://preflight.allthepossibles.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-allthepossibles-preflight]
url = "https://preflight.allthepossibles.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-allthepossibles-preflight": {
      "type": "remote",
      "url": "https://preflight.allthepossibles.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-allthepossibles-preflight --url 'https://preflight.allthepossibles.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-allthepossibles-preflight:
    url: "https://preflight.allthepossibles.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-allthepossibles-preflight": {
      "Transport": "http",
      "Url": "https://preflight.allthepossibles.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-allthepossibles-preflight -t streamable-http -u 'https://preflight.allthepossibles.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-allthepossibles-preflight": {
      "type": "http",
      "url": "https://preflight.allthepossibles.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-22 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-21 (score 69, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-20 (score 69, +41)

- [security improvement] Authorization: unverified → partial
- [security improvement] HTTPS: unverified → pass
- [security improvement] Injection markers: unverified → pass
- [security] First check of Judged manipulation: pass
- [functional regression] MCP protocol: unverified → fail
- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 90
- [functional] First check of Schema quality: excellent
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: fail

### 2026-10-19 (score 28)

First indexed and scored.

## MCP tools (4)

### `scan_mcp_server` (~137 tokens)

Scan MCP server

Check an MCP server for real risk signals before trusting it: unauthenticated transport, capability overreach (filesystem/shell/credential access with no scoping), and known-bad signatures. Pass a live server URL, or a manifest of tool definitions if the server isn't reachable over HTTP. Semantic prompt-injection detection runs too if a Pro API key is sent as an Authorization: Bearer header, see /docs.

Input parameters:

- `serverName` (string)
- `tools` (array): Tool definitions to scan directly, if not probing a live URL
- `url` (string): Live MCP server endpoint (Streamable HTTP transport)

### `scan_content` (~106 tokens)

Scan content

Check a document or web page for hidden instructions before an agent reads, summarizes, or acts on it: invisible Unicode, obfuscated payloads, and (on Pro) a semantic pass for prompt-injection phrasing aimed at the model instead of the human reader. Pass either a URL to fetch, or raw text you already have.

Input parameters:

- `content` (string): Raw text to scan directly, if not fetching a URL
- `url` (string): A page to fetch and scan

### `scan_extension` (~213 tokens)

Scan extension

Check a VS Code extension or a Claude Skill before installing or trusting it. For a VS Code extension (which runs with full Node.js access and no permission model to scope): publisher domain-verification status weighed against install count, and known-bad-signature checks on its description. For a Claude Skill: hidden-instruction and obfuscated-payload detection on the SKILL.md body (the same engine scan_content uses), unscoped or credential-referencing tool grants in its allowed-tools/disallowed-tools frontmatter, inline shell execution baked into the file itself, and pattern matching on any bundled script files for credential-exfiltration signatures. Semantic prompt-injection detection on a skill's body runs too on Pro.

Input parameters:

- `marketplaceId` (string): VS Code Marketplace id, e.g. "nrwl.angular-console"
- `scriptContents` (object): Optional: bundled script file contents to check alongside a skill, filename -> content
- `skillContent` (string): A Claude Skill's SKILL.md content, pasted directly

### `check_output` (~146 tokens)

Check output

Check a structured output you're about to return or act on for degenerate-answer patterns a schema check can't see: invalid JSON, a placeholder value ('TBD', 'N/A', 'unknown') where a real answer should be, an array of byte-identical items (a common symptom of a loop that never advanced), or an expected field that's missing or empty. Schema validity and answer quality are different guarantees, call this before trusting your own output, not just after validating it parses.

Input parameters:

- `expectedFields` (array): Optional: top-level field names expected to be present and non-empty
- `output` (required): The output to check, a JSON string, or an already-parsed value

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-allthepossibles-preflight/preflight#diagnostics

## Score history

- 2026-10-23: 70
- 2026-10-22: 70
- 2026-10-21: 69
- 2026-10-20: 69
- 2026-10-19: 28

## Common questions

### What is the Preflight MCP server?

Preflight is an MCP server listed in the public MCP registry as com.allthepossibles/preflight. Scans an MCP server for security gaps before your agent connects. Free tier, no signup. This page covers its hosted endpoint (https://preflight.allthepossibles.com/mcp).

### Is the Preflight MCP server safe to use?

Preflight scores 70 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Preflight MCP server expose?

Preflight exposes 4 tools: scan_mcp_server, scan_content, scan_extension, check_output. Their descriptions and schemas cost roughly 602 tokens of context every time the server is loaded.

### Does the Preflight MCP server require authentication?

No. We connected to Preflight without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Preflight MCP server still maintained?

Preflight is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://preflight.allthepossibles.com/mcp
- Website: https://preflight.allthepossibles.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-allthepossibles-preflight/preflight.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-allthepossibles-preflight/preflight.json
- HTML version of this page: https://verifymcp.io/servers/com-allthepossibles-preflight/preflight