Preflight
REMOTE · PREFLIGHT.ALLTHEPOSSIBLES.COM
Scans an MCP server for security gaps before your agent connects. Free tier, no signup.
Available components
Last scanned (4 hours ago)
Scores higher than 60% of remote servers
Reachable. Last reached 23 Oct 2026.
Category Security
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. How we score → Why this is hard to score →
Endpoint Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability72
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management10
- Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage97
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 90% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 22 Oct 26 +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.
- 21 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 20 Oct 26 +41
- Authorization: unverified → partial ▲ security
- HTTPS: unverified → pass ▲ security
- Injection markers: unverified → pass ▲ security
- First check of Judged manipulation: pass security
- MCP protocol: unverified → fail ▼ functional
- 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 functional
- 19 Oct 26 28
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 23 Oct 2026 · Probed https://preflight.allthepossibles.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=allthepossibles.com | CN=WE1,O=Google Trust Services,C=US | 27 Aug 2026 | 25 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | 6a24403acd0ae660ee8404c531f0531 |
| SANs: allthepossibles.com, preflight.allthepossibles.com, *.preflight.allthepossibles.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of preflight.allthepossibles.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| allthepossibles.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://preflight.allthepossibles.com/mcp | Verified | 200 | |
| http (plaintext) | http://preflight.allthepossibles.com/mcp | HTTPS enforced | 301 | https://preflight.allthepossibles.com/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
check_output Check output ~146
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.
| Name | Type | Req | Description |
|---|---|---|---|
| expectedFields | array | – | Optional: top-level field names expected to be present and non-empty |
| output | – | yes | The output to check, a JSON string, or an already-parsed value |
No output schema declared.
No examples provided.
scan_content Scan content ~106
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.
| Name | Type | Req | Description |
|---|---|---|---|
| content | string | – | Raw text to scan directly, if not fetching a URL |
| url | string | – | A page to fetch and scan |
No output schema declared.
No examples provided.
scan_extension Scan extension ~213
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 |
No output schema declared.
No examples provided.
scan_mcp_server Scan MCP server ~137
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.
| Name | Type | Req | Description |
|---|---|---|---|
| serverName | string | – | – |
| tools | array | – | Tool definitions to scan directly, if not probing a live URL |
| url | string | – | Live MCP server endpoint (Streamable HTTP transport) |
No output schema declared.
No examples provided.
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.
remote · preflight.allthepossibles.com
claude mcp add --transport http com-allthepossibles-preflight 'https://preflight.allthepossibles.com/mcp'
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.