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 derricktang/pm-workflow-plugin --skill epic-breakdown-advisorgit clone --depth 1 https://github.com/derricktang/pm-workflow-pluginWrote 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/derricktang/pm-workflow-plugin/epic-breakdown-advisor)<a href="https://agentmods.dev/skills/derricktang/pm-workflow-plugin/epic-breakdown-advisor"><img src="https://agentmods.dev/badge/skills/derricktang/pm-workflow-plugin/epic-breakdown-advisor/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/derricktang/pm-workflow-plugin/epic-breakdown-advisor"><img src="https://agentmods.dev/badge/skills/derricktang/pm-workflow-plugin/epic-breakdown-advisor.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 | $0.00038 | $0.05443 |
| Opus 5.5 | $0.00015 | $0.02177 |
| Sonnet 5.5 | $0.00008 | $0.01089 |
| Haiku 4.5 | $0.00004 | $0.00544 |
Grade A, and why
epic-breakdown-advisor 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 1mo 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.
This is a copy
100% identical to epic-breakdown-advisor — 3 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 669 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Purpose
Guide product managers through breaking down epics into user stories using Richard Lawrence's complete Humanizing Work methodology—a systematic, flowchart-driven approach that applies 9 splitting patterns sequentially. Use this to identify which pattern applies, split while preserving user value, and evaluate splits based on what they reveal about low-value work you can eliminate. This ensures vertical slicing (end-to-end value) rather than horizontal slicing (technical layers).
This is not arbitrary slicing—it's a proven, methodical process that starts with validation, walks through patterns in order, and evaluates results strategically.
Key Concepts
Core Principles: Vertical Slices Preserve Value
A user story is "a description of a change in system behavior from the perspective of a user." Splitting must maintain vertical slices—work that touches multiple architectural layers and delivers observable user value—not horizontal slices addressing single components (e.g., "front-end story" + "back-end story").
The Three-Step Process
- Pre-Split Validation: Check if story satisfies INVEST criteria (except "Small")
- Apply Splitting Patterns: Work through 9 patterns sequentially until one fits
- Evaluate Splits: Choose the split that reveals low-value work or produces equal-sized stories
The 9 Splitting Patterns (In Order)
- Workflow Steps — Thin end-to-end slices, not step-by-step
- Operations (CRUD) — Create, Read, Update, Delete as separate stories
- Business Rule Variations — Different rules = different stories
- Data Variations — Different data types/structures
- Data Entry Methods — Simple UI first, fancy UI later
- Major Effort — "Implement one + add remaining"
- Simple/Complex — Core simplest version first, variations later
- Defer Performance — "Make it work" before "make it fast"
- Break Out a Spike — Time-box investigation when uncertainty blocks splitting
Meta-Pattern (Applies Across All Patterns)
- Identify the core complexity
- List all variations
- Reduce variations to one complete slice
- Make other variations separate stories
What ships with it
2 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.
- 1mo ago First seen · 669 lines · 38 tokens per session scan A bfe717bfb231
epic-breakdown-advisor is a skill published in the GitHub repository derricktang/pm-workflow-plugin (2 stars, last pushed 3mo ago), licensed MIT. It adds 38 tokens to every session and 5,443 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to epic-breakdown-advisor, differing in 3 lines, and is treated as a copy.
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