Postio — UK Address, Postcode, Email & Phone Validation
NPM · @POSTIO/MCP
Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.
Available components
Last scanned (16 hours ago)
Scores higher than 99% of npm servers
Category Maps and Location
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security98
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 30 of 94 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency97
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Cryptographically verified build provenance (signed, bound to postio-uk/postio-integrations). View diagnostics → Pass
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 12 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability82
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 509 tokens (~84/item across 6 items; 6 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
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.
- 3 Nov 26 +1
- Stability: 0.97 → pass security
- 2 Nov 26 −1
- Stability: pass → 0.97 functional
- 27 Oct 26 +1
- Stability: 0.97 → pass security
- 25 Oct 26 −1
- Stability: pass → 0.93 functional
- 24 Oct 26 +15
- Malware scan: unverified → pass ▲ security
- 23 Oct 26 −4
- Malware scan: pass → unverified ▼ security
- Provenance: fail → pass ▲ security
- The attested source repository moved: postio-uk/postio-integrations security
- Package version: 0.1.4 → 0.1.5 functional
- 19 Oct 26 0
- Stability: 0.97 → pass security
- 18 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
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 4 Nov 2026 · Analysed npm/@postio/mcp@0.1.5
Provenance Verified
A signed build attestation was found and verified, binding this exact artifact to the source repository it claims to come from.
| Result | Verified |
|---|---|
| Ecosystem | npm |
| Reason | Verified |
| Discovered via | Registry attestation endpoint |
| Source repo | postio-uk/postio-integrations |
| Certificate issuer | https://token.actions.githubusercontent.com |
| Certificate SAN | https://github.com/postio-uk/postio-integrations/.github/workflows/release-packages.yml@refs/heads/master |
| Rekor log index | 3416900911 |
| Predicate type | SLSA build provenance https://slsa.dev/provenance/v1 |
| Subject digest | sha512:a951c0f731306fc50f3309704af8cb4d5efc7f6d98cecf522631f3d76537326687fe05058796c9b29aebbe5e41aeb5bb4a89da5c4dad3be1e1d713f66 |
Background: How many MCP packages publish verified provenance →
Dependencies 94 packages
| Packages resolved | 94 |
|---|---|
| Stale | 30 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
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 →
postio_address_search ~118
Search UK addresses by free-form text — building, street, postcode, organisation, or any combination. Returns a list of suggestions, each with a UDPRN (Royal Mail's per-address ID). Pass a chosen UDPRN to `postio_udprn_lookup` to fetch the full record. Free / non-billable.
| Name | Type | Req | Description |
|---|---|---|---|
| max_results | integer | – | Max results to return. Default 10, max 50. |
| query | string | yes | Search string. Free-form: building, street, postcode, organisation. |
No output schema declared.
No examples provided.
postio_connect ~43
Free key/health probe. Returns 200 if the API key is active and the upstream search service is reachable. Useful as a smoke test or to warm the worker.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
postio_email_validate ~88
Validate an email address: syntax (RFC 5322), typo correction (gnail→gmail), classification (disposable, role, free provider), MX lookup, and live SMTP mailbox probe. Returns an aggregated `deliverability` verdict (deliverable / undeliverable / risky / unknown / invalid) plus every signal independently.
| Name | Type | Req | Description |
|---|---|---|---|
| string | yes | Email address to validate. |
No output schema declared.
No examples provided.
postio_phone_validate ~91
Parse a phone number with libphonenumber and run a live HLR (Home Location Register) lookup. Returns current carrier (post-porting), original carrier, ported flag, reachability, MCC/MNC. Pass numbers in E.164 (`+447700900123`) for unambiguous results.
| Name | Type | Req | Description |
|---|---|---|---|
| number | string | yes | Phone number — E.164, international, or national format. |
No output schema declared.
No examples provided.
postio_postcode_lookup ~91
Return every PAF delivery point at a UK postcode, ordered by building number. Whitespace and case are normalised. Billable on a hit; valid postcodes with no delivery points return an empty list and are not charged.
| Name | Type | Req | Description |
|---|---|---|---|
| max_results | integer | – | Max results. Default 100. |
| postcode | string | yes | UK postcode, e.g. 'W1G 8YW'. |
No output schema declared.
No examples provided.
postio_udprn_lookup ~78
Look up a single UK delivery point by its UDPRN (Royal Mail's stable per-address ID). Use this after `postio_address_search` to fetch the full record for a chosen suggestion. Billable on a hit; misses (404) are not charged.
| Name | Type | Req | Description |
|---|---|---|---|
| udprn | – | yes | Unique Delivery Point Reference Number. |
No output schema declared.
No examples provided.
How do I install the Postio — UK Address, Postcode, Email & Phone Validation MCP server?
Postio — UK Address, Postcode, Email & Phone Validation runs locally as an npm package, launched with npx -y @postio/mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · @postio/mcp
claude mcp add uk-co-postio-postcode-address-validation -- npx -y @postio/mcp
What is the Postio — UK Address, Postcode, Email & Phone Validation MCP server?
Postio — UK Address, Postcode, Email & Phone Validation is an MCP server listed in the public MCP registry as uk.co.postio/postcode-address-validation. Validate UK addresses, postcodes, emails and phone numbers, Royal Mail PAF, live SMTP and HLR. This page covers its npm package (@postio/mcp).
Is the Postio — UK Address, Postcode, Email & Phone Validation MCP server safe to use?
Postio — UK Address, Postcode, Email & Phone Validation scores 96 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 4 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. 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 Postio — UK Address, Postcode, Email & Phone Validation MCP server expose?
Postio — UK Address, Postcode, Email & Phone Validation exposes 6 tools: postio_address_search, postio_postcode_lookup, postio_udprn_lookup, postio_email_validate, postio_phone_validate, postio_connect. Their descriptions and schemas cost roughly 509 tokens of context every time the server is loaded.
Is the Postio — UK Address, Postcode, Email & Phone Validation MCP server still maintained?
Postio — UK Address, Postcode, Email & Phone Validation is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the Postio — UK Address, Postcode, Email & Phone Validation MCP server under?
Postio — UK Address, Postcode, Email & Phone Validation declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.