# Cedulon (npm · @cedulon/mcp-server)

Policy-gated agent spend with signed receipts and rail-extract audit

- Trust score: 90/100 (high trust)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-21

## Components

- npm · `@cedulon/mcp-server`: 90/100 (this document), [markdown](https://verifymcp.io/servers/dogrucanemek-alt-cedulon/cedulon-mcp-server.md), [page](https://verifymcp.io/servers/dogrucanemek-alt-cedulon/cedulon-mcp-server)

## Channel facts

- Registry: `npm`
- Package: `@cedulon/mcp-server`
- Version: `0.13.1`
- Transport: `stdio`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-21.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 31 of 103 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to dogrucanemek-alt/cedulon).
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 9 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 61/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 854 tokens (~170/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 87/100
  - Stability observed for 26 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 88/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 65% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Cedulon MCP server?

Cedulon runs locally as an npm package, launched with npx -y @cedulon/mcp-server. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add dogrucanemek-alt-cedulon -- npx -y @cedulon/mcp-server
```

### Cursor

```json
{
  "mcpServers": {
    "dogrucanemek-alt-cedulon": {
      "command": "npx",
      "args": [
        "-y",
        "@cedulon/mcp-server"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "dogrucanemek-alt-cedulon": {
      "command": "npx",
      "args": [
        "-y",
        "@cedulon/mcp-server"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add dogrucanemek-alt-cedulon -- npx -y @cedulon/mcp-server
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "dogrucanemek-alt-cedulon": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@cedulon/mcp-server"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add dogrucanemek-alt-cedulon --command npx --arg -y --arg @cedulon/mcp-server
```

### Hermes

```yaml
mcp_servers:
  dogrucanemek-alt-cedulon:
    command: "npx"
    args: ["-y", "@cedulon/mcp-server"]
```

### Netclaw

```json
{
  "McpServers": {
    "dogrucanemek-alt-cedulon": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@cedulon/mcp-server"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add dogrucanemek-alt-cedulon -t stdio -c npx -a -y @cedulon/mcp-server
```

### Other

```json
{
  "mcpServers": {
    "dogrucanemek-alt-cedulon": {
      "command": "npx",
      "args": [
        "-y",
        "@cedulon/mcp-server"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-21 (score 90, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 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.

### 2026-09-19 (score 89, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 88, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 87, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-13 (score 86, +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.

### 2026-09-12 (score 85, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-09-11 (score 70, −14)

- [security regression] Malware scan: pass → unverified
- [functional] Package version: 0.13.0 → 0.13.1

### 2026-09-09 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (5)

### `cedulon_spend` (~87 tokens)

Policy-gated spend on the mock rail. Allow returns a signed COSE receipt JSON. Deny returns the fail-closed reason.

Input parameters:

- `amount` (string, required): Integer amount as a decimal string
- `currency` (string, required)
- `nonce` (string, required)
- `payee` (string, required)
- `tool` (string): Calling tool name recorded on the request

### `cedulon_audit` (~521 tokens)

Reconcile the in-process receipt chain and checkpoint against the rail extract: this server's own ledger, or a signed extract you present. Returns audit: balanced or findings, names the account, rail and window it was computed over (scope) when an extract declared one, and counts the class every receipt and row landed in (counts).

Input parameters:

- `extraSettlements` (array): Optional extra extract rows, used to inject a bypass settlement in tests
- `extract` (object): A signed rail extract you were presented with: { body: { accountId, railId, windowStartMs, windowEndMs, settlements: [{ ref, amount, currency, timestampMs }], clockSkewMs? }, signature, publicKeyPem…
- `issuerTrust` (object): Issuer key(s) you hold out of band: { publicKeyPem: string | string[] }. Without it the audit checks this server's records against this server's own key.
- `manifest` (object): A Trade Manifest you were presented with. Omit for a no-manifest deployment. Present without manifestTrust is unauthenticated-manifest.
- `manifestTrust` (object): Manifest publisher key(s) you hold out of band: { publicKeyPem: string | string[] }
- `payeeTrust` (object): Payee keys you hold out of band, keyed by payee: { "payee-1": publicKeyPem }
- `trust` (object): Rail key you hold out of band: { publicKeyPem, accountId?, railId?, windowStartMs?, windowEndMs? }
- `witnessTrust` (object): Transparency log key you hold out of band: { publicKeyPem: string | string[] }

### `cedulon_verify_receipt` (~173 tokens)

Verify a spend receipt COSE_Sign1 (and payee countersignature when present). Supply expectIssuerKeyPem to check it against a key you already hold; without one the receipt is only checked against the key it carries, which any key satisfies.

Input parameters:

- `coseHex` (string)
- `counterCoseHex` (string)
- `expectIssuerKeyPem` (string): Issuer key you hold out of band. Omit and the check is self-referential.
- `expectPayeeKeyPem` (string): Payee key you hold out of band, for the countersignature.
- `payeePublicKeyPem` (string)
- `publicKeyPem` (string)
- `receipt` (object): Full SignedReceipt object from cedulon_spend

### `cedulon_export_ledger` (~49 tokens)

Export receipts, checkpoint, and rail extract in the same JSON shape as npm run demo:export, with the findings, guarantee and counts of the audit over this server's own ledger.

### `cedulon_status` (~24 tokens)

Server version, policy summary, receipt count, and chain head hash.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/dogrucanemek-alt-cedulon/cedulon-mcp-server#diagnostics

## Score history

- 2026-09-21: 90
- 2026-09-20: 89
- 2026-09-19: 89
- 2026-09-18: 88
- 2026-09-17: 88
- 2026-09-16: 87
- 2026-09-15: 87
- 2026-09-14: 86
- 2026-09-13: 86
- 2026-09-12: 85
- 2026-09-11: 70
- 2026-09-10: 84
- 2026-09-09: 84
- 2026-09-08: 83
- 2026-09-07: 83
- 2026-09-06: 83
- 2026-09-05: 82
- 2026-09-04: 82
- 2026-09-03: 81
- 2026-09-02: 80
- 2026-09-01: 81
- 2026-08-31: 81
- 2026-08-30: 65
- 2026-08-29: 54
- 2026-08-28: 69
- 2026-08-27: 66
- 2026-08-26: 66

## Common questions

### What is the Cedulon MCP server?

Cedulon is an MCP server listed in the public MCP registry as io.github.dogrucanemek-alt/cedulon. Policy-gated agent spend with signed receipts and rail-extract audit. This page covers its npm package (@cedulon/mcp-server).

### Is the Cedulon MCP server safe to use?

Cedulon scores 90 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 21 September 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 Cedulon MCP server expose?

Cedulon exposes 5 tools: cedulon_spend, cedulon_audit, cedulon_verify_receipt, cedulon_export_ledger, cedulon_status. Their descriptions and schemas cost roughly 854 tokens of context every time the server is loaded.

### Is the Cedulon MCP server still maintained?

Cedulon is still listed as active in the MCP registry. We last reached this channel on 21 September 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 Cedulon MCP server under?

Cedulon declares the Apache-2.0 licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@cedulon/mcp-server
- Socket report: https://socket.dev/npm/package/@cedulon/mcp-server
- Repository: https://github.com/dogrucanemek-alt/cedulon
- Website: https://cedulon.com/
- Changelog RSS feed: https://verifymcp.io/servers/dogrucanemek-alt-cedulon/cedulon-mcp-server.xml
- Changelog JSON feed: https://verifymcp.io/servers/dogrucanemek-alt-cedulon/cedulon-mcp-server.json
- HTML version of this page: https://verifymcp.io/servers/dogrucanemek-alt-cedulon/cedulon-mcp-server