Add cross-tool positioning, Python helpers, tiers, and hygiene docs

Five improvements to position the library as a serious engineering project:

1. Cross-tool compatibility — new README "Works With" section honestly
   documenting where skills run (Claude Code natively; SKILL.md bodies
   port to other agents and chat LLMs as system prompts).

2. Python helper scripts (stdlib-only) for the three strongest skills:
   - sprint-planning: capacity_calculator.py (recommended commitment)
   - rice-prioritisation: rice_calculator.py (ranks, flags quick wins/moonshots)
   - cs-health-scorecard: health_score.py (weighted total + RAG)
   Each is wired into its SKILL.md and synced to the plugin copies.

3. Explicit skill tiering — TIERS.md + README section marking 46
   Production-Ready skills and calling out Experimental (external-dependency)
   ones; everything else is Stable.

4. Repository hygiene — new CHANGELOG.md (Keep a Changelog format) and
   SKILL-AUTHORING-STANDARD.md; refreshed SECURITY.md version table and
   helper-script disclosure; added .gitignore.

5. Related Projects — README section linking to alirezarezvani/claude-skills
   and the major awesome-claude-skills / awesome-claude-code lists.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016JWn5jRD5tcEFKrubjQ6Px
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@@ -18,12 +18,15 @@ A community-built library of Claude Skills for professionals across every field
## Contents
- [🚀 Quick Install](#-quick-install-2-minutes)
- [🔌 Works With — Cross-Tool Compatibility](#-works-with--cross-tool-compatibility)
- [🌐 Skill Playground — try any skill in your browser](#-skill-playground--try-any-skill-in-your-browser)
- [📦 Plugin Directory](#-plugin-directory)
- [🤖 Building Blocks for Agent Templates](#-building-blocks-for-agent-templates)
- [🏷️ Skill Tiers — start with the strongest](#-skill-tiers--start-with-the-strongest)
- [🗂️ All 167 Skills](#-all-167-skills)
- [📋 Changelog](#-changelog)
- [🤝 Contributing](#-contributing--add-your-skill)
- [🔗 Related Projects](#-related-projects)
---
@@ -74,6 +77,31 @@ ln -s ~/pm-claude-skills/skills/* ~/.claude/skills/
---
## 🔌 Works With — Cross-Tool Compatibility
These skills were built for Claude Code, but they aren't locked to it. Each `SKILL.md` is
two portable parts: a small **frontmatter** block (`name` + `description`) and a
**markdown body** that is just a well-structured set of instructions and output templates.
The body is plain English — so it works anywhere a capable model reads instructions.
| Platform | How it works | Auto-trigger? |
|---|---|---|
| **Claude Code** (CLI / desktop / web / IDE) | Native. Install via the plugin marketplace; Claude loads a skill automatically when your request matches its description. | ✅ Yes |
| **Claude.ai & Claude API** | Upload a skill, or paste the body in as a system prompt / project instruction. | ⚙️ Manual |
| **Other coding agents that read the `SKILL.md` format** (e.g. Codex, Gemini CLI, Cursor) | Point the agent at the skill folder, or paste the body. The frameworks are tool-agnostic; only the auto-discovery mechanism differs per tool. | ⚙️ Varies by tool |
| **General chat LLMs** (ChatGPT, Gemini, Copilot, etc.) | Copy the body of any `SKILL.md` into a custom instruction / system prompt / custom GPT. You keep the full framework and output format. | ❌ Paste per use |
**What's verified vs. what varies:** the skill **bodies** — the frameworks, rubrics, and
output templates that do the actual work — are model-agnostic and have been used across
Claude and other chat LLMs. What's **Claude Code-specific** is the convenience layer:
plugin install, automatic skill discovery from the `description`, and the helper-script
invocation flow. On other tools you copy the body in manually and lose only the
auto-triggering, not the substance.
> Prefer ChatGPT? There's also a [companion Custom GPT library](#-companion-repository--chatgpt-custom-gpts) built from the same frameworks.
---
## 🌐 Skill Playground — Try Any Skill in Your Browser
**▶ Live: [mohitagw15856.github.io/pm-claude-skills](https://mohitagw15856.github.io/pm-claude-skills/)**
@@ -225,6 +253,8 @@ More templates will follow. If you want to contribute one, see the [template con
## 📋 Changelog
The highlights are below. For the structured, [Keep a Changelog](https://keepachangelog.com/)-format history (including unreleased changes), see **[CHANGELOG.md](CHANGELOG.md)**.
<details>
<summary><strong>Release history — v6.0.0 → v14.0.0</strong> (click to expand)</summary>
@@ -398,6 +428,21 @@ This repo was built alongside a published article series. Read the full story:
---
## 🏷️ Skill Tiers — Start With the Strongest
A 170+ skill library doesn't have 170 equally-mature skills, and pretending otherwise
wastes your time. Skills are tiered honestly so you can start with the best work:
- 🟢 **Production-Ready (46)** — battle-tested, stable output, used in real work. Includes the three skills with computed Python helpers (sprint planning, RICE, customer health). **Start here.**
- 🔵 **Stable** — solid, reliable, well-structured; the default for most of the library.
- 🟡 **Experimental** — newer or dependent on an external tool/API/scrape (Gemini, Gmail, browser automation, social scraping). Useful, but more setup and more moving parts.
**👉 Full breakdown: [TIERS.md](TIERS.md)** — every Production-Ready and Experimental skill listed by name.
If you're new, install `pm-essentials` and try a couple of Production-Ready skills before going wide.
---
## 🗂️ All 167 Skills
The [Plugin Directory](#-plugin-directory) above summarises every bundle. Expand below for the full per-skill breakdown with folder paths.
@@ -773,6 +818,8 @@ description: "One sentence. Use when [trigger condition]. Produces [output descr
- Produces consistent, structured output
- Works without needing extensive setup or context
**Before you submit:** read the **[Skill Authoring Standard](SKILL-AUTHORING-STANDARD.md)** — it documents the exact section structure, frontmatter rules, and quality bar every skill in this library follows (including optional stdlib-only helper scripts).
**Skills wishlist** (most requested — up for grabs):
| Skill | Profession | Use Case |
@@ -859,6 +906,31 @@ Read the full breakdown: [Part 12 — I Built the Same Skills Library for ChatGP
---
## 🔗 Related Projects
Claude Skills is a fast-growing open ecosystem. If this library doesn't have what you
need, these community projects are worth a look — and if you maintain one of the lists
below, a reciprocal link is always welcome. 🙌
**Other skill libraries**
- **[alirezarezvani/claude-skills](https://github.com/alirezarezvani/claude-skills)** — a large engineering-leaning library (300+ skills, agents, and commands) with explicit multi-tool support across Claude Code, Codex, Gemini CLI, Cursor, and more.
**Curated "awesome" lists** (great for discovery)
- **[hesreallyhim/awesome-claude-code](https://github.com/hesreallyhim/awesome-claude-code)** — the broad list of skills, hooks, slash-commands, and plugins for Claude Code.
- **[travisvn/awesome-claude-skills](https://github.com/travisvn/awesome-claude-skills)** — curated Claude Skills, resources, and tools.
- **[karanb192/awesome-claude-skills](https://github.com/karanb192/awesome-claude-skills)** — verified skills for Claude Code, Claude.ai, and the API.
- **[ComposioHQ/awesome-claude-skills](https://github.com/ComposioHQ/awesome-claude-skills)** — skills and tools for customizing Claude workflows.
**From this author**
- **[professional-gpt-library](https://github.com/mohitagw15856/professional-gpt-library)** — the same frameworks rebuilt as ChatGPT Custom GPTs.
> Maintain a Claude Skills project and want to be listed here? [Open a PR](../../pulls) or an [issue](../../issues).
---
## 🛠️ Custom Skills for Your Team
The 155 skills in this library are built for general professional workflows. But the most powerful version of Claude Skills is one built specifically for *your* team — your templates, your terminology, your processes, your quality standards.