Borrowing it
Nothing to install: this file belongs to taurgis/sfcc-dev-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/taurgis/sfcc-dev-mcp/main/.github/instructions/mcp-yml-tests.instructions.mdgit clone --depth 1 https://github.com/taurgis/sfcc-dev-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/instructions/taurgis/sfcc-dev-mcp/mcp-yml-tests)<a href="https://agentmods.dev/instructions/taurgis/sfcc-dev-mcp/mcp-yml-tests"><img src="https://agentmods.dev/badge/instructions/taurgis/sfcc-dev-mcp/mcp-yml-tests/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/instructions/taurgis/sfcc-dev-mcp/mcp-yml-tests"><img src="https://agentmods.dev/badge/instructions/taurgis/sfcc-dev-mcp/mcp-yml-tests.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00212 | $0.00212 |
| Opus 5 | $0.00106 | $0.00106 |
| Sonnet 5 | $0.00042 | $0.00042 |
| Haiku 4.5 | $0.00021 | $0.00021 |
Grade A, and why
sfcc-dev-mcp mcp-yml-tests.instructions.md 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 9d 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.
What it actually says
MCP YAML Testing Instructions
For detailed guidance on writing YAML tests, use the mcp-yaml-testing skill located at .github/skills/mcp-yaml-testing/SKILL.md.
Quick Reference
Golden Rule: Always discover response formats first:
npx aegis query [tool_name] '[params]' --config ./aegis.config.docs-only.json
Test Execution:
npm run test:mcp:yaml # docs-only mode
npm run test:mcp:yaml:full # full mode with credentials
Common Patterns:
"match:contains:substring"- Contains text"match:regex:\\d+"- Regex (double-escape backslashes)"match:type:array"- Type validation"match:arrayElements:"with"match:partial:"- Flexible array validation
For complete pattern reference and troubleshooting, see the skill file.
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.
- 9d ago First seen · 27 lines · 212 tokens per session scan A b439fc588c08
sfcc-dev-mcp mcp-yml-tests.instructions.md is an instructions file published in the GitHub repository taurgis/sfcc-dev-mcp (28 stars, last pushed 2d ago), licensed MIT. It adds 212 tokens to every session, about $0.0011 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 2026-08-30.
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