# Crux

> Crux — cuecrux-crux. Use this tool when you need to securely retrieve and verify information with cryptographic receipts, or perform token-budgeted searches across a fact store. It solves problems related to data integrity, authenticity, and efficient querying, and provides inputs such as search queries and token budgets, with outputs including verified results and gap reports. Ideal for use cases requiring reliable and transparent data retrieval, such as auditing or fact-checking, in contexts like git version control systems.

Canonical page: https://skillsregistry.net/skills/cuecrux-crux  
JSON: https://api.skillsregistry.net/v1/skills/cuecrux-crux

## Description

Retrieval engine with cryptographic receipts. Token-budgeted search, fact store, gap reporting. Single binary, runs anywhere.

## Trust

- **Trust score (0–1):** 0.50
- **Verification tier:** unverified

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** container
- **Runtime environment:** vm
- **License:** Apache-2.0
- **Updated:** 2026-09-27

## Source

- **Source listing:** [GitHub](https://github.com/CueCrux/Crux)

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "cuecrux-crux"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/cuecrux-crux` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/cuecrux-crux/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt