# Existing Site Analyzer

> Analyze an existing website before improve, redesign, rebuild, or migration decisions. Use when a project has a current URL, local HTML/codebase, screenshots, sitemap, robots, analytics export, asset folder, or legacy site materials and needs a local-first audit with approval-gated crawling or authenticated access.

- **Type:** Skill
- **Install:** `agentstack add skill-sergekostenchuk-ui-ux-agent-skill-system-existing-site-analyzer`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [sergekostenchuk](https://agentstack.voostack.com/s/sergekostenchuk)
- **Installs:** 0
- **Category:** [Data & Analytics](https://agentstack.voostack.com/c/data-and-analytics)
- **Latest version:** 0.1.0
- **License:** Apache-2.0
- **Upstream author:** [sergekostenchuk](https://github.com/sergekostenchuk)
- **Source:** https://github.com/sergekostenchuk/ui-ux-agent-skill-system/tree/main/core/skills/existing-site-analyzer

## Install

```sh
agentstack add skill-sergekostenchuk-ui-ux-agent-skill-system-existing-site-analyzer
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Existing Site Analyzer

This skill creates the evidence base for existing-site work. It does not decide rebuild strategy by itself and does not mutate the live site.

## Operating Modes

- `local-inventory`: inspect local HTML, source files, assets, sitemap, robots, and reports.
- `public-url-review`: review public URLs or fetched HTML only after network/crawling approval.
- `screenshot-review`: analyze screenshots when URL or source is unavailable.
- `asset-inventory`: inventory images, videos, docs, icons, maps, and brand assets.
- `handoff`: produce evidence for `rebuild-or-improve-advisor` and `migration-planner`.

## Required Workflow

1. Read [references/existing-site-analysis-contract.md](references/existing-site-analysis-contract.md).
2. Confirm source type and privacy:
   - local files and user-provided public screenshots: allowed;
   - public URL crawling/fetching: approval required if not already requested;
   - authenticated/private pages, analytics, CRM, or CMS: explicit approval and data-handling note required.
3. Use [assets/existing-site-audit.template.md](assets/existing-site-audit.template.md) for the report.
4. Record evidence status for every source: `Ran`, `Skipped`, `Planned`, or `Manual`.
5. Capture:
   - page inventory;
   - content and IA;
   - SEO/LLM surface;
   - UX and conversion issues;
   - technical constraints;
   - asset inventory;
   - migration risks.
6. Hand off to `rebuild-or-improve-advisor`; involve `migration-planner` if URL structure, redirects, sitemap, robots, schema, or launch risk may change.

## Safety Rules

- Do not crawl private/authenticated pages without explicit approval.
- Do not store private analytics exports, cookies, tokens, private URLs, or `.env` values in reports.
- Do not claim Lighthouse, browser, crawler, or DOM evidence unless it was actually run.
- Do not change production content, redirects, robots, sitemap, DNS, CMS, or deployment settings.

## Handoff Shape

```text
Mode:
Sources:
Evidence status:
Major findings:
SEO/LLM risks:
UX risks:
Technical constraints:
Asset inventory:
Migration risk:
Next owner:
```

## Validation

When editing this skill, run:

```bash
python3 $CODEX_HOME/skills/.system/skill-creator/scripts/quick_validate.py $CODEX_HOME/skills/existing-site-analyzer
python3 $CODEX_HOME/skills/senior-skill-architect/scripts/lint_production_skill.py $CODEX_HOME/skills/existing-site-analyzer
python3 -m json.tool $CODEX_HOME/skills/existing-site-analyzer/evals/evals.json >/dev/null
```

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [sergekostenchuk](https://github.com/sergekostenchuk)
- **Source:** [sergekostenchuk/ui-ux-agent-skill-system](https://github.com/sergekostenchuk/ui-ux-agent-skill-system)
- **License:** Apache-2.0

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** yes
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-sergekostenchuk-ui-ux-agent-skill-system-existing-site-analyzer
- Seller: https://agentstack.voostack.com/s/sergekostenchuk
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.