# Decision Table Builder

> decision-table-builder

- Skill: `45ck/decision-table-builder` (Agent Skill)
- Install (CLI): `npx skillmds@latest add 45ck/decision-table-builder`
- Raw SKILL.md: https://api.skillmd.com/api/skills/45ck/decision-table-builder/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: 45ck (https://skillmd.com/u/45ck)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/45ck/decision-table-builder

---

# decision-table-builder

## Purpose
Translate combinational business logic into a structured decision table and derive lean but sufficient tests.

## Trigger this skill when
- You need disciplined test design rather than ad hoc case generation.
- You need to justify why a test set is sufficient.
- You want a reusable artifact that can feed automation later.

## Expected inputs
- business rules
- conditions
- actions or outcomes
- policy exceptions

## Deliverables
- decision table
- collapsed rule set
- test scenarios
- rule completeness notes

## Operating procedure
1. List the conditions and possible values that drive outcomes.
2. Enumerate or collapse rules into a clean decision table.
3. Mark impossible or forbidden combinations explicitly.
4. Derive a lean test set that covers each meaningful rule.

## Quality gates
- Be explicit about infeasible, unreachable, or assumption-heavy cases.
- Prefer lean, justified test sets over exhaustive-looking noise.
- Keep expected outcomes observable and tied back to rules or logic.
- Show why each test exists, not just the test data.

## Handoff targets
- pairwise-test-generator
- test-oracle-writer
- requirements-conflict-checker if present

## Output style
- Be explicit about uncertainty, infeasibility, and residual risk.
- Prefer compact, explainable artifacts over bloated lists.
- Tie tests back to rules, logic, or structure.
- Make expected outcomes observable.

## Failure modes to avoid
- Do not hide contradictory rules.
- Do not leave impossible combinations unmarked.
- Do not produce a giant table without pruning or explanation.

## Minimum output skeleton
```md
## Summary
## Findings
## Structured outputs
## Coverage / rationale
## Assumptions
## Open questions
## Recommended next skill
```