Home / andreibesleaga / gabbe · GitHub

legacy-modernization SKILL.md skillA

legacy-modernization from andreibesleaga/gabbe is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add andreibesleaga/gabbe/legacy-modernization@git:20261014.de0823c

Pins git:20261014.de0823c in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: andreibesleaga/gabbe
Path: plugins/gabbe-architecture/skills/legacy-modernization/SKILL.md
Versions recorded: 1
Latest version: git:20261014.de0823c, committed Oct 14, 2026
Size: 4,245 bytes
Repository stars: 23
License: a license file GitHub does not identify

Analyze, document, and modernize legacy systems (COBOL, Mainframe, Fortran). Use when: legacy code, cobol, mainframe, fortran, ibm z, jcl, db2, cics, modernization, rewrite, migration.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Legacy Modernization Skill

## Goal
To respect the critical nature of legacy systems while safely guiding them toward modernization. **Rule #1: Do no harm.**

## Capabilities

### 1. Code Analysis (The Archaeologist)
-   **Explain Logic**: Translate COBOL/Fortran business logic into plain English or Pseudocode.
-   **Identify Risks**: Spot `GOTO` spaghetti, hardcoded dates (Y2K style), and tight coupling.
-   **Data Mapping**: Map VSAM/Copybooks to JSON/SQL schemas.

### 2. Modernization Patterns
-   **API Wrapping (The Facade)**: Create a REST/gRPC wrapper around the legacy core.
-   **Strangler Fig**: Incrementally replace functions with microservices.
-   **Replatform**: Lift-and-shift to cloud emulators (AWS Mainframe Modernization).

### 3. Testing Legacy
-   **Characterization Tests**: "Lock down" current behavior before changing ANYTHING.
-   **Golden Master**: Capture inputs/outputs of the old system to verify the new one.

## Steps
1.  **Assume Importance**: If it's running, it's making money. Treat legacy code with reverence.
2.  **No Big Bang**: Never suggest a full rewrite from scratch unless the system is < 10k LOC.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add andreibesleaga/gabbe/legacy-modernization@sha256:5b260b91f0ed4c6e

The line at the top of this page pins the label git:20261014.de0823c, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_4ievu7lwt3dxq3n2.svg)](https://markdownregistry.com/a/art_4ievu7lwt3dxq3n2)

0 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Oct 14, 2026.

version	committed	commit	size	audit
git:20261014.de0823c latest	2026-10-14	de0823c	4,245 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4245 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

andreibesleaga/gabbe · 23 stars · license a license file GitHub does not identify · pushed 2026-11-02 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_4ievu7lwt3dxq3n2
GET https://markdownregistry.com/api/v1/resolve?ref=andreibesleaga/gabbe/legacy-modernization
GET https://markdownregistry.com/api/v1/blob/5b260b91f0ed4c6e94ccc2b80f2c335b705d9d09ed1f9353fbb450bb2db82019

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

More from andreibesleaga/gabbe

AGENTS.md AGENTS.md file

andreibesleaga/gabbe · AGENTS.md

git:20261029.5ebfbf5 · audit A · 23 stars

AGENTS.md@agents AGENTS.md file

andreibesleaga/gabbe · agents/AGENTS.md

git:20261029.ce4317a · audit A · 23 stars

llms.txt llms.txt file

andreibesleaga/gabbe · llms.txt

git:20261029.d5d23d8 · audit C · 23 stars

a2ui-protocols SKILL.md skill

andreibesleaga/gabbe · plugins/gabbe-ai/skills/a2ui-protocols/SKILL.md · Design and enforce Agent-to-UI communication protocols. Use when: design agent ui protocol, implement a2ui, build genui.