# mcp-assert

> mcp-assert — blackwell-systems-mcp-assert. Use this tool when you need to ensure deterministic correctness testing for MCP servers, verifying that your tools return accurate results. It solves problems of unreliable testing by providing a robust assertion mechanism, eliminating the need for LLM-based judgment. This tool takes in test inputs and returns pass/fail outputs, ideal for use in development and validation contexts.

Canonical page: https://skillsregistry.net/skills/blackwell-systems-mcp-assert  
JSON: https://api.skillsregistry.net/v1/skills/blackwell-systems-mcp-assert

## Description

The testing standard for MCP servers. Lint (14 rules), test, and fuzz over real stdio/SSE/HTTP transport. 18 assertion types in YAML. Found 4,794 schema issues across 55 servers. Any language, no mocks, single binary.

## Trust

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

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** container
- **Runtime environment:** vm
- **Category:** other
- **Updated:** 2026-09-28

## Source

- **Source listing:** [GitHub](https://github.com/blackwell-systems/mcp-assert)

## 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": "blackwell-systems-mcp-assert"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/blackwell-systems-mcp-assert` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/blackwell-systems-mcp-assert/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