Borrowing it
Nothing to install: this file belongs to Hack23/European-Parliament-MCP-Server. 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/Hack23/European-Parliament-MCP-Server/main/.github/skills/c4-architecture-documentation/SKILL.mdgit clone --depth 1 https://github.com/Hack23/European-Parliament-MCP-ServerWrote 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/hack23/european-parliament-mcp-server/c4-architecture-documentation)<a href="https://agentmods.dev/skills/hack23/european-parliament-mcp-server/c4-architecture-documentation"><img src="https://agentmods.dev/badge/skills/hack23/european-parliament-mcp-server/c4-architecture-documentation/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/hack23/european-parliament-mcp-server/c4-architecture-documentation"><img src="https://agentmods.dev/badge/skills/hack23/european-parliament-mcp-server/c4-architecture-documentation.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00024 | $0.00707 |
| Opus 5.5 | $0.00010 | $0.00283 |
| Sonnet 5.5 | $0.00005 | $0.00141 |
| Haiku 4.5 | $0.00002 | $0.00071 |
Grade A, and why
c4-architecture-documentation 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.
How it starts
The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
C4 Architecture Documentation Skill
Purpose
Document MCP server architecture using C4 model for different abstraction levels with Mermaid diagrams.
When to Use
- ✅ Documenting system architecture (ARCHITECTURE.md)
- ✅ Security architecture documentation (SECURITY_ARCHITECTURE.md)
- ✅ Future architecture planning (FUTURE_ARCHITECTURE.md)
- ✅ Architecture decision records
- ✅ Onboarding new developers
Required Documentation Portfolio
Current State
| Document | Purpose |
|---|---|
| ARCHITECTURE.md | Complete C4 models (Context, Container, Component) |
| DATA_MODEL.md | Data structures, entities, relationships |
| FLOWCHART.md | Business process and data flows |
| STATEDIAGRAM.md | System state transitions and lifecycles |
| MINDMAP.md | System conceptual relationships |
| SWOT.md | Strategic analysis and positioning |
| SECURITY_ARCHITECTURE.md | Current security design and controls |
Future State
| Document | Purpose |
|---|---|
| FUTURE_ARCHITECTURE.md | Architectural evolution roadmap |
| FUTURE_DATA_MODEL.md | Enhanced data architecture plans |
| FUTURE_FLOWCHART.md | Improved process workflows |
| FUTURE_STATEDIAGRAM.md | Advanced state management |
| FUTURE_MINDMAP.md | Capability expansion plans |
| FUTURE_SWOT.md | Future strategic opportunities |
| FUTURE_SECURITY_ARCHITECTURE.md | Planned security improvements |
C4 Model Levels
Level 1: System Context
graph TB
User[AI Assistant/Developer] -->|MCP Protocol| Server[European Parliament MCP Server]
Server -->|REST API| EPAPI[European Parliament Open Data API]
Server -->|JSON-LD| EPData[EP Data Portal]
Level 2: Container Diagram
graph TB
Client[MCP Client] -->|stdio/SSE| MCPServer[MCP Server - Node.js/TypeScript]
MCPServer -->|HTTP/JSON| EPClient[EP API Client]
EPClient -->|REST| EPAPI[data.europarl.europa.eu]
MCPServer -->|Zod| Schemas[Validation Schemas]
Level 3: Component Diagram
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 First seen · 92 lines · 24 tokens per session scan A 0148ab213beb
c4-architecture-documentation is a skill published in the GitHub repository Hack23/European-Parliament-MCP-Server (29 stars, last pushed yesterday), licensed Apache-2.0. It adds 24 tokens to every session and 707 once invoked, about $0.0001 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 2026-08-30.
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