Zeno
REMOTE · APP.ZENO-WORKS.CH
AI bookkeeper for Swiss small companies: books invoices, reconciles the bank, keeps VAT current.
Available components
Last scanned (3 hours ago)
Scores higher than 93% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Finance and Payments
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 Security100
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token. View diagnostics → Pass
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC is configured correctly; the domain's records validate against the full chain to the root. View diagnostics → Pass
- The authorisation server supports Client ID Metadata Documents, the current MCP client-registration mechanism. View diagnostics → Pass
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability50
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 12690 tokens (~248/item across 51 items; 51 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 Management80
- Stability observed for 24 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage67
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 51 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 52 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.
- 5 Nov 26 +1
- Tool “reverse_gl_journal_entry” rewrote its description, which is the text the model reads security
- Server version: 0.1.0+d75cd4d48 → 0.1.0+5e9a177e9 functional
- 4 Nov 26 0
- Server version: 0.1.0+c5de59c53 → 0.1.0+d75cd4d48 functional
- 3 Nov 26 +1
- The server rewrote its instructions, which are the text every model session reads security
- Tool “list_gl_open_items” rewrote its description, which is the text the model reads security
- Server version: 0.1.0+19329ee70 → 0.1.0+c5de59c53 functional
- “list_items” added an optional parameter “analysis_failed” cosmetic
- 2 Nov 26 0
- Server version: 0.1.0+c450ba873 → 0.1.0+19329ee70 functional
- 1 Nov 26 +1
- Server version: 0.1.0+c9492a675 → 0.1.0+c450ba873 functional
- 31 Oct 26 0
- Server version: 0.1.0+c0e34a083 → 0.1.0+c9492a675 functional
- 30 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.
- 29 Oct 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Server version: 0.1.0+55a85ad12 → 0.1.0+c0e34a083 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 · Probed https://app.zeno-works.ch/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_256_GCM_SHA384 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=app.zeno-works.ch | CN=YE1,O=Let's Encrypt,C=US | 6 Sept 2026 | 5 Dec 2026 | ECDSA 256 | ECDSA-SHA384 | 63d2e9bc07b824fbd8b8006a8fdcb8f019a |
| SANs: app.zeno-works.ch | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC secure
Validation of app.zeno-works.ch. — Secure
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ch. | present | 58745 | 13 | Verified |
| zeno-works.ch. | present | 1449, 1449 | 13, 13 | Verified |
| app.zeno-works.ch. | Verified address RRset verified with the apex keys |
Authentication Enforced and verified
The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.
| Result | Enforced and verified |
|---|---|
| Enforced | On tool calls |
| HTTP status | 200 |
WWW-Authenticate challenge Bearer resource_metadata="https://app.zeno-works.ch/.well-known/oauth-protected-resource"
Bearer resource_metadata="https://app.zeno-works.ch/.well-known/oauth-protected-resource"| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
Protected resource metadata
| Document | https://app.zeno-works.ch/.well-known/oauth-protected-resource |
|---|---|
| Retrieved | Yes |
| Resource | https://app.zeno-works.ch/mcp |
| Authorisation server | https://app.zeno-works.ch |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://app.zeno-works.ch/mcp | Verified | 200 | |
| http (plaintext) | http://app.zeno-works.ch/mcp | HTTPS enforced | 301 | https://app.zeno-works.ch/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 →
zeno_overview ~59
What Zeno does, in one page — the platform's capabilities and its limits. **Needs no credential.** Read this before telling a user that Zeno cannot do something; it covers VAT, payroll, reconciliation and the AI accountant.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
How do I install the Zeno MCP server?
Zeno is a hosted endpoint at https://app.zeno-works.ch/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 · app.zeno-works.ch
claude mcp add --transport http ch-zeno-works-zeno 'https://app.zeno-works.ch/mcp'
What is the Zeno MCP server?
Zeno is an MCP server listed in the public MCP registry as ch.zeno-works/zeno. AI bookkeeper for Swiss small companies: books invoices, reconciles the bank, keeps VAT current. This page covers its hosted endpoint (https://app.zeno-works.ch/mcp).
Is the Zeno MCP server safe to use?
Zeno scores 86 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 Zeno MCP server expose?
Zeno exposes 51 tools: find_operations, describe_operations, call_operation, request_api_key, start_signup, and 46 more. Their descriptions and schemas cost roughly 10,092 tokens of context every time the server is loaded.
Does the Zeno MCP server require authentication?
Yes. Zeno asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.
Is the Zeno MCP server still maintained?
Zeno 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.