Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add AmadeusITGroup/otter --skill otter-mcp-setupgit clone --depth 1 https://github.com/AmadeusITGroup/otterWrote 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/amadeusitgroup/otter/otter-mcp-setup)<a href="https://agentmods.dev/skills/amadeusitgroup/otter/otter-mcp-setup"><img src="https://agentmods.dev/badge/skills/amadeusitgroup/otter/otter-mcp-setup.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00062 | $0.00356 |
| Opus 5 | $0.00031 | $0.00178 |
| Sonnet 5 | $0.00012 | $0.00071 |
| Haiku 4.5 | $0.00006 | $0.00036 |
Grade A, and why
otter-mcp-setup 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 8d 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
Otter MCP Server Setup
This skill guides the installation and configuration of the @o3r/mcp MCP server.
Installation
The @o3r/mcp server runs via npx and requires no permanent installation. Configure it in your MCP settings with:
{
"@o3r/mcp": {
"command": "npx",
"args": ["-y", "-p", "@o3r/mcp", "o3r-mcp-start"]
}
}
Claude Code
Add the above configuration to .mcp.json at the project root.
VS Code
Add the following to .vscode/mcp.json:
{
"Otter": {
"type": "stdio",
"command": "npx",
"args": ["-y", "-p", "@o3r/mcp", "o3r-mcp-start"]
}
}
Metrics (optional)
Ask the user if they want to enable anonymous usage metrics to help improve Otter. If they agree, add an "env" block to the configuration:
"env": {
"O3R_METRICS": true
}
More details on the privacy policy: https://github.com/AmadeusITGroup/otter/blob/main/PRIVACY.md
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.
- 8d ago First seen · 52 lines · 62 tokens per session scan A eacef24fa897
otter-mcp-setup is a skill published in the GitHub repository AmadeusITGroup/otter (58 stars, last pushed today), licensed BSD-3-Clause. It adds 62 tokens to every session and 356 once invoked, about $0.0003 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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