# Cejel (oci · ghcr.io/barglabs/cejel)

Offline deterministic engineering-trust certificates for repositories, with no telemetry.

- Trust score: 65/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-23

## Components

- oci · `ghcr.io/barglabs/cejel`: 65/100 (this document), [markdown](https://verifymcp.io/servers/barglabs-cejel/ghcr-io-barglabs-cejel.md), [page](https://verifymcp.io/servers/barglabs-cejel/ghcr-io-barglabs-cejel)

## Channel facts

- Registry: `oci`
- Package: `ghcr.io/barglabs/cejel`
- Version: `sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa`
- 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 2026-10-23.

- **Supply Chain Security**: 8/100
  - No malware scan is available for this kind of package: the supply-chain vendors we use do not cover it. This is a permanent gap in our coverage, not a finding about the package.
  - CVE check failed: a known high-severity CVE affects @modelcontextprotocol/sdk 1.29.0, a direct dependency. A fixed version is available.
  - Install-script risk not yet assessed.
  - Dependency health could not be checked: this image's dependency list comes from an SBOM its publisher attached. It names packages and versions but not whether each is deprecated, still maintained or linked to its source, so there is nothing we can fairly grade.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to BargLabs/cejel).
  - Clear OSI-approved license (AGPL-3.0).
  - Actively maintained (last published 0 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 84/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 268 tokens (~89/item across 3 items; 1 tools + 2 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 70/100
  - Stability observed for 21 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 2 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 Cejel MCP server?

Cejel runs locally as a container image, launched with docker run --rm -i ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa. Ready-made configuration for Claude, Cursor, VS Code, Codex and 3 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add barglabs-cejel -- docker run --rm -i ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa
```

### Cursor

```json
{
  "mcpServers": {
    "barglabs-cejel": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "barglabs-cejel": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add barglabs-cejel -- docker run --rm -i ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "barglabs-cejel": {
      "type": "local",
      "command": [
        "docker",
        "run",
        "--rm",
        "-i",
        "ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa"
      ],
      "enabled": true
    }
  }
}
```

### Hermes

```yaml
mcp_servers:
  barglabs-cejel:
    command: "docker"
    args: ["run", "--rm", "-i", "ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa"]
```

### Netclaw

```json
{
  "McpServers": {
    "barglabs-cejel": {
      "Transport": "stdio",
      "Command": "docker",
      "Arguments": [
        "run",
        "--rm",
        "-i",
        "ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa"
      ]
    }
  }
}
```

### Other

```json
{
  "mcpServers": {
    "barglabs-cejel": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "ghcr.io/barglabs/cejel@sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa"
      ]
    }
  }
}
```

## 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.

### 2026-10-23 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 64, 0)

- [security regression] Stability: 0.63 → unverified
- [security regression] Tool safety: pass → unverified
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Schema quality: 100 → unverified
- [functional] Package version: sha256:71022cd23502367c132622bdd92966825c751aa50fb9e6294fdd49928178ac88 → sha256:12372dededed8fbdbe6d1061e6792e3d83e51d0640899dfbc1f8189f8ea67daa

### 2026-10-21 (score 64, +1)

- [security regression] CVE-2026-111771 affects this package: high
- [security regression] CVE-2026-111768 affects this package: high
- [security regression] CVE-2026-111769 affects this package: high
- [security regression] CVE-2026-111767 affects this package: high

### 2026-10-19 (score 63, +1)

- [security regression] Stability: 0.53 → unverified
- [security regression] Tool safety: pass → unverified
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Schema quality: 100 → unverified
- [functional] Package version: sha256:9c34228f628181de3ee6d9bd6f6b97edcae7ae8a90ada8fc5f764fc3eb29ca21 → sha256:71022cd23502367c132622bdd92966825c751aa50fb9e6294fdd49928178ac88

### 2026-10-16 (score 62, +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.

### 2026-10-15 (score 61, 0)

- [security regression] Stability: 0.40 → unverified
- [security regression] Tool safety: pass → unverified
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Schema quality: 100 → unverified
- [functional] Package version: sha256:64af5535487aa9600835514c2d79b0c244cd9c1941f91a593367fd36cf87a1a8 → sha256:9c34228f628181de3ee6d9bd6f6b97edcae7ae8a90ada8fc5f764fc3eb29ca21
- [functional] Package version: sha256:64af5535487aa9600835514c2d79b0c244cd9c1941f91a593367fd36cf87a1a8 → sha256:41ecb138d0e6e73eb2e629d25d2e28d0eab54b19ed047a09cf2438cf675b3320

### 2026-10-14 (score 61, +39)

- [security improvement] Injection markers: unverified → pass
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] Schema quality: unverified → 100
- [functional improvement] Stability: unverified → 0.40
- [functional improvement] MCP protocol: unverified → pass
- [functional] Package version: sha256:e22864891b07fca25d0b6ea6ba70d6522427675e6171de9a42b95199f5e9cd44 → sha256:64af5535487aa9600835514c2d79b0c244cd9c1941f91a593367fd36cf87a1a8

### 2026-10-13 (score 22, 0)

- [functional] Package version: sha256:a633138b59ee1f3a191ca149484d528c1268fd300a98a76dd07169effa330f94 → sha256:64af5535487aa9600835514c2d79b0c244cd9c1941f91a593367fd36cf87a1a8

## MCP tools (1)

### `scan` (~227 tokens)

Scan repository trust

Score a repository's engineering-trust signals (tests, secrets, isolation, claim-vs-reality, CI discipline) with the @cejel/cejel trust-certificate scan — the exact same offline, deterministic scoring as running the @cejel/cejel CLI on the path. Returns the trust cert as JSON: overall + code/process sub-scores (0-4) for a scored repository, or null scores with an abstention reason when Cejel establishes structural source absence or zero measurable free-core criteria; plus the verdict and top findings. No network, no telemetry, no signup. After a scan, the full HTML certificate and SVG badge are readable as the resources cejel-cejel://last-scan/certificate.html and cejel-cejel://last-scan/badge.svg.

Input parameters:

- `format` (string): summary (default): compact cert digest — scores, verdict, top findings. json: the full structured report, identical to the CLI's report.json.
- `path` (string, required): Path to the repository to score (absolute, or relative to the server CWD)

## Diagnostics

Captured diagnostic sections: Provenance, Vulnerabilities. The full working is on the page: https://verifymcp.io/servers/barglabs-cejel/ghcr-io-barglabs-cejel#diagnostics

## Score history

- 2026-10-23: 65
- 2026-10-22: 64
- 2026-10-21: 64
- 2026-10-20: 63
- 2026-10-19: 63
- 2026-10-18: 62
- 2026-10-17: 62
- 2026-10-16: 62
- 2026-10-15: 61
- 2026-10-14: 61
- 2026-10-13: 22
- 2026-10-12: 22
- 2026-10-11: 22
- 2026-10-06: 54
- 2026-10-05: 54
- 2026-10-04: 54
- 2026-10-03: 53
- 2026-10-02: 53

## Common questions

### What is the Cejel MCP server?

Cejel is an MCP server listed in the public MCP registry as io.github.BargLabs/cejel. Offline deterministic engineering-trust certificates for repositories, with no telemetry. This page covers its container image (ghcr.io/barglabs/cejel).

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

Cejel scores 65 out of 100 on VerifyMCP. We recorded 13 known advisories against it as of 23 October 2026. 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 Cejel MCP server expose?

Cejel exposes 1 tool: scan. Their descriptions and schemas cost roughly 227 tokens of context every time the server is loaded.

### Is the Cejel MCP server still maintained?

Cejel is still listed as active in the MCP registry. We last reached this channel on 23 October 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 Cejel MCP server under?

Cejel declares the AGPL-3.0 licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- GitHub Container Registry: https://ghcr.io/barglabs/cejel
- Repository: https://github.com/BargLabs/cejel
- Website: https://cejel.dev/
- Changelog RSS feed: https://verifymcp.io/servers/barglabs-cejel/ghcr-io-barglabs-cejel.xml
- Changelog JSON feed: https://verifymcp.io/servers/barglabs-cejel/ghcr-io-barglabs-cejel.json
- HTML version of this page: https://verifymcp.io/servers/barglabs-cejel/ghcr-io-barglabs-cejel