# MainframeKit (npm · mainframekit-mcp)

Mainframe help, no mainframe needed: check JCL and DFSORT, explain abends, lay out copybooks.

- Trust score: 67/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `mainframekit-mcp`: 67/100 (this document), [markdown](https://verifymcp.io/servers/vidyutsaha1210-mainframekit/mainframekit-mcp.md), [page](https://verifymcp.io/servers/vidyutsaha1210-mainframekit/mainframekit-mcp)

## Channel facts

- Registry: `npm`
- Package: `mainframekit-mcp`
- Version: `0.1.3`
- 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 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 6/100
  - Repository check failed: no source repository is declared.
  - Provenance check failed: no build-provenance attestation is published.
  - Licence could not be checked: the licence is shipped as a file inside the package, not declared as a standard (SPDX) licence identifier, so we cannot tell whether it is OSI-approved.
  - Actively maintained (last published 3 days ago).
  - Security-disclosure policy not yet verified: we couldn't inspect the source repository.
- **Schema Quality & AI Usability**: 86/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 413 tokens (~103/item across 4 items; 4 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 20/100
  - Stability observed for 6 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 4 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 MainframeKit MCP server?

MainframeKit runs locally as an npm package, launched with npx -y mainframekit-mcp. 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 vidyutsaha1210-mainframekit -- npx -y mainframekit-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "vidyutsaha1210-mainframekit": {
      "command": "npx",
      "args": [
        "-y",
        "mainframekit-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "vidyutsaha1210-mainframekit": {
      "command": "npx",
      "args": [
        "-y",
        "mainframekit-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add vidyutsaha1210-mainframekit -- npx -y mainframekit-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "vidyutsaha1210-mainframekit": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "mainframekit-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add vidyutsaha1210-mainframekit --command npx --arg -y --arg mainframekit-mcp
```

### Hermes

```yaml
mcp_servers:
  vidyutsaha1210-mainframekit:
    command: "npx"
    args: ["-y", "mainframekit-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "vidyutsaha1210-mainframekit": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "mainframekit-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add vidyutsaha1210-mainframekit -t stdio -c npx -a -y mainframekit-mcp
```

### Other

```json
{
  "mcpServers": {
    "vidyutsaha1210-mainframekit": {
      "command": "npx",
      "args": [
        "-y",
        "mainframekit-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-11-03 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 66, +16)

- [security regression] Stability: 0.03 → unverified
- [security regression] Tool safety: pass → unverified
- [security improvement] Malware scan: unverified → pass
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Schema quality: 100 → unverified
- [functional] Package version: 0.1.2 → 0.1.3

### 2026-10-31 (score 50, 0)

- [security improvement] Malware scan: unverified → pass
- [functional improvement] Stability: unverified → 0.03
- [functional] Package version: 0.1.1 → 0.1.2

### 2026-10-30 (score 50)

First indexed and scored.

## MCP tools (4)

### `check_jcl` (~74 tokens)

Check JCL

Check z/OS JCL for common mistakes (columns, continuations, DISP, SPACE, DCB, names, PARM length) and explain every JOB, EXEC and DD statement in plain English. Use before submitting or suggesting JCL.

Input parameters:

- `jcl` (string, required): The JCL, one card per line

### `explain_dfsort` (~65 tokens)

Explain DFSORT statements

Explain DFSORT / ICETOOL-style control statements (SORT, MERGE, INCLUDE/OMIT COND, INREC/OUTREC BUILD, SUM) in plain English and flag problems.

Input parameters:

- `statements` (string, required): DFSORT control statements, as in SYSIN

### `lookup_code` (~119 tokens)

Look up a mainframe error code

Explain a z/OS abend (S0C7, SB37, U4038…), Db2 SQLCODE (-805, -911…), CICS abend or RESP code (ASRA, AEY9, NOTFND…) or IBM MQ reason code (2035, 2085…): meaning, causes, fixes, IBM sources and links.

Input parameters:

- `code` (string, required): The code, e.g. S0C7, 0C4, -805, SQL0805N, ASRA, 2035

### `copybook_layout` (~78 tokens)

COBOL copybook layout

Lay out a COBOL copybook: every field's start position (1-based), length and storage type (packed, binary, zoned, text), and the record length. Handles PIC, USAGE, OCCURS, REDEFINES.

Input parameters:

- `copybook` (string, required): The copybook source (01-level record and its fields)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/vidyutsaha1210-mainframekit/mainframekit-mcp#diagnostics

## Score history

- 2026-11-05: 67
- 2026-11-04: 67
- 2026-11-03: 67
- 2026-11-02: 66
- 2026-11-01: 66
- 2026-10-31: 50
- 2026-10-30: 50

## Common questions

### What is the MainframeKit MCP server?

MainframeKit is an MCP server listed in the public MCP registry as io.github.vidyutsaha1210/mainframekit. Mainframe help, no mainframe needed: check JCL and DFSORT, explain abends, lay out copybooks. This page covers its npm package (mainframekit-mcp).

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

MainframeKit scores 67 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 MainframeKit MCP server expose?

MainframeKit exposes 4 tools: check_jcl, explain_dfsort, lookup_code, copybook_layout. Their descriptions and schemas cost roughly 336 tokens of context every time the server is loaded.

### Is the MainframeKit MCP server still maintained?

MainframeKit 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.

## Links

- npm package: https://www.npmjs.com/package/mainframekit-mcp
- Socket report: https://socket.dev/npm/package/mainframekit-mcp
- Website: https://mainframekit.com/ai/
- Changelog RSS feed: https://verifymcp.io/servers/vidyutsaha1210-mainframekit/mainframekit-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/vidyutsaha1210-mainframekit/mainframekit-mcp.json
- HTML version of this page: https://verifymcp.io/servers/vidyutsaha1210-mainframekit/mainframekit-mcp