ReturnCheck
NPM · RETURNCHECK-MCP · 2 COMPONENTS
Can this product actually be returned? The merchant's exact clause, its URL and the date.
Available components
Last scanned (8 hours ago)
Scores higher than 65% of npm servers
Category E-commerce
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 Security100
- 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
- No production dependencies, so there is no dependency health to assess. View diagnostics → Pass
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 68 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability56
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 396 tokens (~396/item across 1 items; 1 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 Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage86
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 58% 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 1 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 2 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.
- 1 Nov 26 0
- Stability: 0.97 → pass security
- 31 Oct 26 0
- Stability: pass → 0.97 functional
- 25 Oct 26 0
- Stability: 0.97 → pass security
- 24 Oct 26 0
- Stability: pass → 0.97 functional
- 18 Oct 26 0
- Stability: 0.97 → pass security
- 17 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.
- 15 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.
- 13 Oct 26 +1
- Security disclosure: unverified → fail ▼ functional
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 5 Nov 2026 · Analysed npm/returncheck-mcp@0.1.1
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Dependencies 0 packages
| Packages resolved | 0 |
|---|---|
| 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 →
check_return ~316
Answer one question: can this specific product actually be returned? Give a product_url and buyer_country and you get a verified verdict — YES / YES_WITH_CONDITIONS / NO / UNKNOWN — with the exact policy clause quoted verbatim, the source URL, the return window and a confidence score. Coverage, measured not claimed: on 50 real US retailers (frozen list, 2026-08-28) the policy was reached for 17. The rest are stores that serve no policy text to anything but a real browser. Pass page_text yourself and those work too. Never invents: returns UNKNOWN instead of guessing, and UNKNOWN is free.
| Name | Type | Req | Description |
|---|---|---|---|
| buyer_country | string | yes | ISO 3166-1 alpha-2, e.g. 'US'. |
| delivery_date | string | – | YYYY-MM-DD (optional; preferred for the deadline). |
| item_condition | string | – | – |
| membership | string | – | Loyalty tier, if the buyer has one (e.g. 'Plus'). |
| merchant | string | – | – |
| page_html | string | – | Optional: raw HTML, if you already have it. |
| page_text | string | – | Optional: the page text, if you already have it. If omitted, this package fetches it locally. |
| product_url | string | yes | The product page URL (http/https). |
| purchase_channel | string | – | – |
| purchase_date | string | – | YYYY-MM-DD (optional). |
| reason | string | – | – |
| seller_name | string | – | – |
No output schema declared.
No examples provided.
How do I install the ReturnCheck MCP server?
ReturnCheck runs locally as an npm package, launched with npx -y returncheck-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 · returncheck-mcp
claude mcp add mangelmartinezfer-hue-returncheck -- npx -y returncheck-mcp
What is the ReturnCheck MCP server?
ReturnCheck is an MCP server listed in the public MCP registry as io.github.mangelmartinezfer-hue/returncheck. Can this product actually be returned? The merchant's exact clause, its URL and the date. This page covers its npm package (returncheck-mcp).
Is the ReturnCheck MCP server safe to use?
ReturnCheck scores 80 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. 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 ReturnCheck MCP server expose?
ReturnCheck exposes 1 tool: check_return. Their descriptions and schemas cost roughly 316 tokens of context every time the server is loaded.
Is the ReturnCheck MCP server still maintained?
ReturnCheck is still listed as active in the MCP registry. We last reached this channel on 5 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 ReturnCheck MCP server under?
ReturnCheck declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.