cobol-o-matic: Skill for Claude Code

.claude/skills/repo-standards/SKILL.md

repo-standards is a skill for Claude Code from dsheard/cobol-o-matic. It costs 38 tokens per session (907 once invoked), scanned A, original, MIT.

A set of repository instructions for understanding a COBOL reverse-engineering tool and its workspace layout. COBOL is a programming language commonly used in older business systems.

In plain words
What is it for?
It is for locating configuration, source COBOL files, generated Markdown, staged large files, prompts, templates, and core Python components.
Why use it?
It helps an agent distinguish the tool's source code from the separate workspaces where analysis happens and follow the repository's conventions.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions CLAUDE.md.

This is dsheard/cobol-o-matic's own configuration. It tells Claude Code how to work on cobol-o-matic itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cobol-o-matic configures →

Reuse

Borrowing it

Nothing to install: this file belongs to dsheard/cobol-o-matic. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/dsheard/cobol-o-matic/main/.claude/skills/repo-standards/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/dsheard/cobol-o-matic

Made for: Claude Code.

Wrote 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.

agentmods badge for repo-standards

README.md
[![agentmods](https://agentmods.dev/badge/skills/dsheard/cobol-o-matic/repo-standards/github.svg)](https://agentmods.dev/skills/dsheard/cobol-o-matic/repo-standards)
Your own site
<a href="https://agentmods.dev/skills/dsheard/cobol-o-matic/repo-standards"><img src="https://agentmods.dev/badge/skills/dsheard/cobol-o-matic/repo-standards/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.

agentmods 80×15 button for repo-standards

Your own site · 80×15
<a href="https://agentmods.dev/skills/dsheard/cobol-o-matic/repo-standards"><img src="https://agentmods.dev/badge/skills/dsheard/cobol-o-matic/repo-standards.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 907 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00038 $0.00907
Opus 5 $0.00019 $0.00453
Sonnet 5 $0.00008 $0.00181
Haiku 4.5 $0.00004 $0.00091

Measured 11d ago against content hash 129a30ef1345, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

repo-standards 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 11d 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.

.claude/skills/repo-standards/SKILL.md · 69 lines

How it starts

The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Standards

Tool / Workspace Separation

The tool (code, skills, templates) lives at the repository root. Analysis workspaces live in subdirectories or external paths.

cobol/                              # Tool (code lives here)
├── analyse.py       # Thin CLI entry point
├── orchestrator/                   # Core Python package (config, agents, runner, cli, models, state, parser, stager)
├── prompts/                        # Agent prompt builders (one per worker)
├── templates/                      # Output artifact templates (frontmatter + sections)
├── examples/                       # Reference configs for open-source COBOL apps
├── CLAUDE.md                       # Dev-focused (for IDE agent editing the tool)
└── README.md

workspace/                          # Analysis workspace (agents run here)
├── config.yaml                     # Config: source paths, output dir, settings
├── CLAUDE.md                       # Agent-focused (output conventions)
├── source/                         # COBOL input files
├── output/                         # Generated markdown artifacts
├── staging/                        # Chunked files for large programs
└── .cobol-re-state*.json           # Orchestrator state files (auto-managed)

The orchestrator sets cwd to the workspace directory when spawning agents. Domain knowledge and template content are embedded directly in prompts by the orchestrator -- agents do not need to read external reference files.

Source Directory Configuration

Source paths are lists of directories in config.yaml, relative to the workspace. The tool scans all listed directories for files matching configured extensions.

Type Required Extensions Purpose
programs Yes .cbl, .cob, .CBL, .COB COBOL program source files
copybooks Yes .cpy, .copy, .CPY, .COPY Copybook include files
jcl No .jcl, .JCL, .prc, .PRC JCL jobs and procedures
bms No .bms, .BMS CICS BMS screen map definitions
csd No .csd, .CSD CICS CSD resource definitions
sql No .sql, .SQL SQL/DDL definitions

Read the full file on GitHub · 69 lines

Changes

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.

  1. 11d ago First seen · 69 lines · 38 tokens per session scan A 129a30ef1345

Subscribe to this mod's changes

repo-standards is a skill published in the GitHub repository dsheard/cobol-o-matic (5 stars, last pushed 5mo ago), licensed MIT. It adds 38 tokens to every session and 907 once invoked, about $0.0002 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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