Merron
REMOTE · MERRON.APP
Inspect selected project excerpts and screen user-confirmed facts for bounded EU AI Act readiness.
Available components
Last scanned (11 hours ago)
Scores higher than 91% of remote servers
Reachable. Last reached 5 Nov 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 Security80
- 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
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- 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 Usability69
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 604 tokens (~151/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 Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage81
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 43% 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 5 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.
- 12 Oct 26 +1
- Stability: 0.97 → pass security
- 10 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 87 to 93. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.
- 8 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 77 to 87. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 5 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.
- 29 Sept 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Schema quality: 134 → 151 ▼ functional
- Server version: 0.1.1 → 0.2.0 functional
- New tool “merron_prepare_workspace” functional
- 28 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 19 Sept 26 0
- Tool “merron_get_questions” rewrote its description, which is the text the model reads security
- Schema quality: excellent → good functional
- “merron_screen_ai_act” reworded the description of “factsConfirmedByUser” cosmetic
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 · Probed https://merron.app/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.merron.app | CN=YR1,O=Let's Encrypt,C=US | 20 Oct 2026 | 18 Jan 2027 | RSA 2048 | SHA256-RSA | 65dbc7b27bedb08dfce057cfaddae7a5138 |
| SANs: *.merron.app, merron.app | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of merron.app. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| app. | present | 23684 | 8 | Verified |
| merron.app. | 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 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
| content-security-policy | default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self' https://checkout.stripe.com; script-src 'self' 'unsafe-inline' https://vercel.live; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https://vercel.live; font-src 'self' data:; connect-src 'self' https://vercel.live; frame-src https://vercel.live https://js.stripe.com https://hooks.stripe.com; worker-src 'self' blob:; upgrade-insecure-requests |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=(), payment=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://merron.app/mcp | Verified | 200 | |
| http (plaintext) | http://merron.app/mcp | HTTPS enforced | 308 | https://merron.app/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 →
merron_get_questions Get AI Act screening questions ~60
Get relevant business questions and explanations for a selected AI system. Pass only known user answers; omit unknown values or use null. Does not classify or assume unanswered questions mean No. No sign-in or private workspace access.
| Name | Type | Req | Description |
|---|---|---|---|
| facts | object | – | – |
No output schema declared.
No examples provided.
merron_prepare_workspace Prepare the system in a private Merron workspace ~161
Save this AI system to Merron so the user can build an evidence pack from it: the name, a description, the answers the user confirmed and the file/line findings from merron_scan_project. Returns a private single-use link, valid 7 days; the user signs in, the system opens prefilled and Merron guides them through connecting the code, confirming the answers and creating the pack. Ask the user first and tell them what will be saved. Never include code excerpts, secrets or personal data; findings carry only paths, line numbers and codes. Give the user the link exactly as returned.
| Name | Type | Req | Description |
|---|---|---|---|
| system | object | yes | – |
| userAgreed | boolean | yes | True only after the user agrees to save these details to Merron. |
No output schema declared.
No examples provided.
merron_scan_project Inspect selected project excerpts ~124
Find possible AI integrations, model calls, disclosure wording and sensitive-use wording in user-selected project excerpts. Returns file/line references and follow-up questions, not a legal classification. First explain that the excerpts will be sent to Merron and obtain the user's agreement. Never send secrets, personal customer records, whole repositories or files the user has not authorised. Does not fetch URLs, execute code, persist inputs or access private cases.
| Name | Type | Req | Description |
|---|---|---|---|
| files | array | yes | – |
| sharingConfirmed | boolean | yes | True only after the user agrees to send these selected excerpts to Merron. |
No output schema declared.
No examples provided.
merron_screen_ai_act Screen confirmed facts for the EU AI Act ~115
Run Merron's versioned, bounded AI Act rules on facts the user has explicitly confirmed. Returns a conditional screening result, unresolved routes, missing questions and official references. Never infer confirmation or legal compliance from source code or absence of signals. Unknown answers remain unknown. This computation does not check documents, use an AI model, save a report, access accounts or certify compliance.
| Name | Type | Req | Description |
|---|---|---|---|
| facts | object | yes | – |
| factsConfirmedByUser | boolean | yes | True only after the user confirms the supplied answers describe the actual system. |
No output schema declared.
No examples provided.
How do I install the Merron MCP server?
Merron is a hosted endpoint at https://merron.app/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 · merron.app
claude mcp add --transport http app-merron-ai-act-check 'https://merron.app/mcp'
What is the Merron MCP server?
Merron is an MCP server listed in the public MCP registry as app.merron/ai-act-check. Inspect selected project excerpts and screen user-confirmed facts for bounded EU AI Act readiness. This page covers its hosted endpoint (https://merron.app/mcp).
Is the Merron MCP server safe to use?
Merron scores 85 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 Merron MCP server expose?
Merron exposes 4 tools: merron_scan_project, merron_get_questions, merron_screen_ai_act, merron_prepare_workspace. Their descriptions and schemas cost roughly 460 tokens of context every time the server is loaded.
Does the Merron MCP server require authentication?
No. We connected to Merron without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Merron MCP server still maintained?
Merron 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.