Borrowing it
Nothing to install: this file belongs to DaveGold/mcp-metadata-demo. 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/DaveGold/mcp-metadata-demo/main/.agents/skills/mcp-compat-check/SKILL.mdgit clone --depth 1 https://github.com/DaveGold/mcp-metadata-demoWrote 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/davegold/mcp-metadata-demo/mcp-compat-check)<a href="https://agentmods.dev/skills/davegold/mcp-metadata-demo/mcp-compat-check"><img src="https://agentmods.dev/badge/skills/davegold/mcp-metadata-demo/mcp-compat-check/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/davegold/mcp-metadata-demo/mcp-compat-check"><img src="https://agentmods.dev/badge/skills/davegold/mcp-metadata-demo/mcp-compat-check.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 | $0.00141 | $0.00249 |
| Opus 5.5 | $0.00056 | $0.00100 |
| Sonnet 5.5 | $0.00028 | $0.00050 |
| Haiku 4.5 | $0.00014 | $0.00025 |
Grade A, and why
mcp-compat-check 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 1mo 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
Read and follow the canonical project skill at
.codex/skills/mcp-compat-check/SKILL.md.
It is a byte-identical copy of .claude/skills/mcp-compat-check/; src/skill-copies.test.ts
keeps the two in sync.
What ships with it
1 file 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.
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.
- 1mo ago Changed · -65 lines 848c50dce4bd
- 1mo ago First seen · 84 lines · 141 tokens per session scan A 3245f8f022a1
mcp-compat-check is a skill published in the GitHub repository DaveGold/mcp-metadata-demo (5 stars, last pushed 11d ago), licensed MIT. It adds 141 tokens to every session and 249 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-09-29.
mcp-compat-check compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-compat-checkDaveGold/mcp-metadata-demo | Skill | 5 | 11d ago | MIT | A | 141 | Claude Code, Codex |
| reviewing-pull-requestsd-oit/rust-2026-template | Skill | 15 | yesterday | MIT | A | 132 | Claude Code |
| architecture-diagramd-oit/rust-2026-template | Skill | 15 | yesterday | MIT | A | 67 | Claude Code, Codex |
| dora-reportd-oit/rust-2026-template | Skill | 15 | yesterday | MIT | A | 52 | Claude Code, Codex |
| atomic-commitd-oit/rust-2026-template | Skill | 15 | yesterday | MIT | A | 76 | Claude Code, Codex |
| privacy-firstd-oit/rust-2026-template | Skill | 15 | yesterday | MIT | A | 72 | Claude Code, Codex |
| task-decompositiond-oit/rust-2026-template | Skill | 15 | yesterday | MIT | A | 56 | Claude Code, Codex |