# Semantic Core Builder

> Build an evidence-labeled semantic core and crawlable site structure from keyword harvests, existing content, or user-provided search-demand data. Use before SEO/LLM site architecture, concept prototypes, paid traffic planning, IA, or public-site redesign decisions.

- Skill: `sergekostenchuk/semantic-core-builder` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add sergekostenchuk/semantic-core-builder`
- Raw SKILL.md: https://api.skillmd.com/api/skills/sergekostenchuk/semantic-core-builder/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Marketing & Growth
- Author: sergekostenchuk (https://skillmd.com/u/sergekostenchuk)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/sergekostenchuk/semantic-core-builder

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# Semantic Core Builder

This skill turns raw keyword/search inputs into a structured semantic core. It hands the result to `seo-llm-site-architect`, `concept-prototyper`, and later design/implementation skills.

## Operating Modes

- `build`: create `reports/semantic-core.json` and `docs/site-structure.md`.
- `merge`: merge existing-site keywords, user-provided terms, and harvested demand.
- `audit`: review a semantic core for missing provenance, duplicate clusters, or weak intent mapping.

## Required Workflow

1. Read [references/semantic-core-contract.md](references/semantic-core-contract.md).
2. Load `reports/keyword-harvest.json` or a user-provided equivalent.
3. Cluster keywords by intent and topic; label any LLM grouping as `Inference`.
4. Produce cluster records: intent, priority, canonical URL candidate, page type, evidence, and confidence.
5. Write machine-readable `reports/semantic-core.json` and human-readable `docs/site-structure.md`.
6. Hand off to `concept-prototyper` and `seo-llm-site-architect`.

## Safety And Evidence

- Do not invent search volume or SERP facts.
- If no real SERP/source evidence exists, label the output as `Manual` or `Inference`.
- Do not bury conflicts; record cannibalization, unclear intent, or missing evidence.

## Handoff Shape

```text
Input path:
Clusters:
High-priority URLs:
Conflicts:
Evidence gaps:
Output paths:
Next skills: concept-prototyper, seo-llm-site-architect
```

## Validation

```bash
python3 $CODEX_HOME/skills/.system/skill-creator/scripts/quick_validate.py $CODEX_HOME/skills/semantic-core-builder
python3 $CODEX_HOME/skills/senior-skill-architect/scripts/lint_production_skill.py $CODEX_HOME/skills/semantic-core-builder
```