Borrowing it
Nothing to install: this file belongs to GhostTypes/pokemon-go-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/GhostTypes/pokemon-go-mcp/main/.claude/skills/mcp-test-harness/SKILL.mdgit clone --depth 1 https://github.com/GhostTypes/pokemon-go-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ghosttypes/pokemon-go-mcp/mcp-test-harness)<a href="https://agentmods.dev/skills/ghosttypes/pokemon-go-mcp/mcp-test-harness"><img src="https://agentmods.dev/badge/skills/ghosttypes/pokemon-go-mcp/mcp-test-harness/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ghosttypes/pokemon-go-mcp/mcp-test-harness"><img src="https://agentmods.dev/badge/skills/ghosttypes/pokemon-go-mcp/mcp-test-harness.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 77 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 80 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00094 | $0.01244 |
| Opus 5 | $0.00047 | $0.00622 |
| Sonnet 5 | $0.00019 | $0.00249 |
| Haiku 4.5 | $0.00009 | $0.00124 |
Grade A, and why
mcp-test-harness scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Test Harness
Build production-ready, fully automated integration test suites for MCP servers using STDIO transport. Tests run against live servers and validate real data.
Quick Start Decision
| Server Language | Testing Stack | Reference |
|---|---|---|
| Python (FastMCP) | pytest + pytest-asyncio + FastMCP Client | Python Guide |
| TypeScript/Node | Vitest + @modelcontextprotocol/sdk | TypeScript Guide |
| Any language | MCP Inspector CLI (bash/PowerShell) | Inspector CLI |
Core Philosophy
These are integration tests, not unit tests:
- Tests run against the actual MCP server (not mocks)
- Tests validate real data returned from tools
- Tests use STDIO transport (the standard for local MCP servers)
- Tests should pass before any deployment or version bump
Workflow
Step 1: Gather Requirements
Before writing tests, ask the user for:
- Server location: Path to the MCP server entry point
- Server language: Python (FastMCP) or TypeScript
- Tool inventory: List all tools the server exposes (or discover via Inspector)
- For each tool to test:
- Example valid inputs
- Expected output values or patterns to validate
- Edge cases and known error conditions
- External dependencies (APIs, databases, files)
- Environment requirements: API keys, config files, setup steps
Step 2: Choose Testing Approach
Python/FastMCP (Recommended for Python servers):
- In-memory testing via
Client(server)- no subprocess needed - Fastest, most reliable approach
- Full protocol compliance
- See references/python-fastmcp.md
TypeScript/Vitest (Recommended for TS servers):
- Subprocess-based via
StdioClientTransport - Native TypeScript, excellent DX
- See references/typescript-vitest.md
MCP Inspector CLI (Universal fallback):
- Works with any language
- Good for quick validation or CI pipelines
- See references/inspector-cli.md
What ships with it
10 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- assets/python/conftest.py 1.3 KB runs code
- assets/python/pyproject_snippet.toml 1.8 KB
- assets/python/test_mcp_template.py 4.7 KB runs code
- assets/typescript/mcp-server.test.ts 6.8 KB runs code
- assets/typescript/package_snippet.json 679 B
- assets/typescript/vitest.config.ts 1.1 KB runs code
- references/inspector-cli.md 10 KB
- references/python-fastmcp.md 9.9 KB
- references/test-patterns.md 8.8 KB
- references/typescript-vitest.md 14 KB
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 140 lines · 94 tokens per session scan A cd23e092c3f9
mcp-test-harness is a skill published in the GitHub repository GhostTypes/pokemon-go-mcp (7 stars, last pushed today), licensed MIT. It adds 94 tokens to every session and 1,244 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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