Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add DauQuangThanh/hanoi-rainbow --skill ibm-mainframegit clone --depth 1 https://github.com/DauQuangThanh/hanoi-rainbowWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dauquangthanh/hanoi-rainbow/ibm-mainframe)<a href="https://agentmods.dev/skills/dauquangthanh/hanoi-rainbow/ibm-mainframe"><img src="https://agentmods.dev/badge/skills/dauquangthanh/hanoi-rainbow/ibm-mainframe/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dauquangthanh/hanoi-rainbow/ibm-mainframe"><img src="https://agentmods.dev/badge/skills/dauquangthanh/hanoi-rainbow/ibm-mainframe.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00182 | $0.02374 |
| Opus 5 | $0.00091 | $0.01187 |
| Sonnet 5 | $0.00036 | $0.00475 |
| Haiku 4.5 | $0.00018 | $0.00237 |
Grade A, and why
ibm-mainframe scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 244 lines — stays where its author put it; the contents beside it link to each section on GitHub.
IBM Mainframe
Overview
Comprehensive guidance for IBM Mainframe (z/OS) administration, development, operations, and modernization. Covers system programming, application development, middleware configuration, database management, and migration strategies for mainframe environments.
Quick Start Guide
Choose your task and load the appropriate reference:
- z/OS System Administration → Load zos-administration.md for system operations, address spaces, JES2/JES3, TSO/ISPF commands, dataset management, and USS
- JCL Development & Batch Processing → Load jcl-batch-processing.md for JCL syntax, utilities (IEBGENER, SORT, IDCAMS), procedures, GDG management, and job scheduling
- COBOL Programming → Load cobol-programming.md for COBOL structure, file handling, DB2/CICS integration, compile/link procedures, and debugging
- Mainframe Modernization → Load mainframe-modernization.md for migration strategies, assessment, rehost/replatform/refactor approaches, and cloud integration
Core Mainframe Concepts
z/OS Operating System
- MVS (Multiple Virtual Storage): Core OS components
- JES2/JES3: Job Entry Subsystems for batch processing
- TSO/ISPF: Time Sharing Option / Interactive System Productivity Facility
- USS: Unix System Services (POSIX environment on z/OS)
- Address Spaces: Isolated execution environments (ASID)
Key Subsystems
- CICS: Customer Information Control System (transaction processing)
- IMS: Information Management System (hierarchical DB + transaction manager)
- DB2: Relational database management system
- MQ: Message queuing middleware
- WebSphere: Application server for Java applications
Data Management
- VSAM: Virtual Storage Access Method (indexed, sequential, relative record)
- Sequential Files: PS (Physical Sequential), PDS (Partitioned Data Set), PDSE
- GDG: Generation Data Group (versioned datasets)
- SMS: Storage Management Subsystem (automated data management)
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 244 lines · 182 tokens per session scan A 46a5cf9bc871
ibm-mainframe is a skill published in the GitHub repository DauQuangThanh/hanoi-rainbow (17 stars, last pushed 7mo ago), licensed MIT. It adds 182 tokens to every session and 2,374 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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