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The Semantic Layer for AI Agents. Prunes noisy API data by 70%+ for token-efficient reasoning.
About
The Semantic Layer for AI Agents. Prunes noisy API data by 70%+ for token-efficient reasoning.
Security Report
Valid MCP server (2 strong, 4 medium validity signals). 7 known CVEs in dependencies (0 critical, 5 high severity) Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.
7 files analyzed · 8 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: BRAVE_SEARCH_API_KEY
Environment variable: SERPER_API_KEY
Environment variable: TAVILY_API_KEY
Environment variable: APILAYER_KEY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-shawn5cents-agentskin": {
"env": {
"APILAYER_KEY": "your-apilayer-key-here",
"SERPER_API_KEY": "your-serper-api-key-here",
"TAVILY_API_KEY": "your-tavily-api-key-here",
"BRAVE_SEARCH_API_KEY": "your-brave-search-api-key-here"
},
"args": [
"-y",
"agentskin-server"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
AgentSkin Suite
The complete token optimization stack for AI coding agents. Three complementary tools that eliminate the "Token Tax" across the full agent cycle — API responses, CLI output, and agent replies.
The Suite
| Component | What It Does | Savings | Creator |
|---|---|---|---|
| AgentSkin SSS | Semantic JSON pruning via MCP | 60–88% on rich APIs | Shawn Nichols Sr. |
| Tokenjuice CLI | Rule-driven terminal output compaction | Up to 99.97% on large outputs | Vincent Koc (MIT) |
| Caveman | Output compression via prompt engineering | 65% output reduction | Julius Brussee |
Quick Start
# 1. AgentSkin MCP server
npx -y agentskin@latest
# 2. Bash hook (transparent CLI optimization)
source .agents/hooks/bash-optimizer.sh
# 3. Caveman — already active via AGENTS.md
By the Numbers
| Metric | Value |
|---|---|
| GitHub API savings | 88.3% (1,544 → 180 tokens) |
ls -laR directory listing | 99.97% (3.19M → 897 chars) |
| Caveman output compression | 65% average |
| Caveman memory compression | 46% smaller |
| MCP tools | 7 across unified server |
| Combined test suite | 4,695 tests, 274 files — 100% passing |
| Pipeline throughput | 3,030 fixtures/sec (0.33ms avg) |
| Net session savings | 17.1% (zero overhead via bash hook) |
Tools
AgentSkin Suite MCP (7 tools, unified)
fetch_optimized_data · skin_reasoning · classify_url · strip_ansi · reduce · estimate_tokens · apply_json_semantic
Caveman Skills (6 skills)
caveman · caveman-commit · caveman-review · caveman-stats · caveman-compress · cavecrew
Documentation
| Doc | Description |
|---|---|
| OVERVIEW.md | Project overview and quick start |
| ARCHITECTURE.md | Technical architecture and data flow |
| STATUS.md | Phase completion and test coverage |
| BENCHMARK.md | Live API compression benchmarks |
| USAGE.md | Full usage guide — hook, caveman, MCP |
| THREE-LAYER-RULES.md | Rule config override semantics |
| AUTHORS.md | Credits and component details |
Security
- SSRF Protection: Blocks private IPv4/IPv6 ranges and cloud metadata services
- Rate Limiting: 60 req/min sliding window
- Input Validation: Zod schemas for all tool inputs
- Processing Timeout: 30-second limit
Credits
| Creator | Contribution |
|---|---|
| Shawn Nichols Sr. (Nichols Transco LLC) | AgentSkin SSS protocol, MCP server, Suite integration |
| Vincent Koc | Tokenjuice — MIT License |
| Julius Brussee | Caveman — github.com/JuliusBrussee/caveman |
Website
agentskin.dev — Protocol specification, examples, FAQ, and whitepaper.
© 2026 Nichols Transco LLC.
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