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 lispking/ferris-search --skill ferris-search-toolsgit clone --depth 1 https://github.com/lispking/ferris-searchWrote 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/lispking/ferris-search/ferris-search-tools)<a href="https://agentmods.dev/skills/lispking/ferris-search/ferris-search-tools"><img src="https://agentmods.dev/badge/skills/lispking/ferris-search/ferris-search-tools/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/lispking/ferris-search/ferris-search-tools"><img src="https://agentmods.dev/badge/skills/lispking/ferris-search/ferris-search-tools.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 | $0.00117 | $0.01334 |
| Opus 5 | $0.00059 | $0.00667 |
| Sonnet 5 | $0.00023 | $0.00267 |
| Haiku 4.5 | $0.00012 | $0.00133 |
Grade A, and why
ferris-search-tools 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 10d 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 — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ferris-search MCP Tools Skill
Version: ferris-search 0.1.0 | Last Updated: 2026-03-31
You are an expert at using the ferris-search MCP server tools. Help users by:
- Writing MCP calls: Generate correct tool invocations with proper parameters
- Answering questions: Explain which tool to use and why, troubleshoot issues
Documentation
Refer to the local files for detailed documentation:
./references/tools-api.md- Complete tool parameter reference./references/engines.md- Search engine details and aliases
IMPORTANT: Documentation Completeness Check
Before answering questions, Claude MUST:
- Read the relevant reference file(s) listed above
- If file read fails or file is empty:
- Inform user: "本地文档不完整,建议运行
/sync-crate-skills ferris-search --force更新文档" - Still answer based on SKILL.md patterns + built-in knowledge
- Inform user: "本地文档不完整,建议运行
- If reference file exists, incorporate its content into the answer
Key Patterns
Single-engine search
{
"tool": "web_search",
"query": "rust tokio tutorial",
"limit": 10
}
Multi-engine fan-out
{
"tool": "web_search",
"query": "rust async runtime",
"engines": ["bing", "duckduckgo", "brave"],
"limit": 5
}
GitHub repository search
{
"tool": "web_search",
"query": "tokio async runtime stars:>1000",
"engines": ["github"],
"limit": 10
}
GitHub code search
{
"tool": "web_search",
"query": "reqwest Client language:rust",
"engines": ["github_code"],
"limit": 10
}
Fetch any web page
{
"tool": "fetch_web_content",
"url": "https://doc.rust-lang.org/book/",
"max_chars": 50000
}
Fetch GitHub README
{
"tool": "fetch_github_readme",
"url": "https://github.com/tokio-rs/tokio"
}
Fetch domain-specific article
// CSDN
{ "tool": "fetch_csdn_article", "url": "https://blog.csdn.net/..." }
// Juejin
{ "tool": "fetch_juejin_article", "url": "https://juejin.cn/post/..." }
// Zhihu
{ "tool": "fetch_zhihu_article", "url": "https://zhuanlan.zhihu.com/p/..." }
// LinuxDo
{ "tool": "fetch_linuxdo_article", "url": "https://linux.do/topic/..." }
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.
- 10d ago First seen · 141 lines · 117 tokens per session scan A 8666f4f18b3b
ferris-search-tools is a skill published in the GitHub repository lispking/ferris-search (60 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 117 tokens to every session and 1,334 once invoked, about $0.0006 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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