Borrowing it
Nothing to install: this file belongs to stephaneberle9/mcp-server-vegalite-viewer. 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/stephaneberle9/mcp-server-vegalite-viewer/main/CLAUDE.mdgit clone --depth 1 https://github.com/stephaneberle9/mcp-server-vegalite-viewerWrote 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/instructions/stephaneberle9/mcp-server-vegalite-viewer/claude-md)<a href="https://agentmods.dev/instructions/stephaneberle9/mcp-server-vegalite-viewer/claude-md"><img src="https://agentmods.dev/badge/instructions/stephaneberle9/mcp-server-vegalite-viewer/claude-md/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/instructions/stephaneberle9/mcp-server-vegalite-viewer/claude-md"><img src="https://agentmods.dev/badge/instructions/stephaneberle9/mcp-server-vegalite-viewer/claude-md.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 | $0.00460 | $0.00460 |
| Opus 5 | $0.00230 | $0.00230 |
| Sonnet 5 | $0.00092 | $0.00092 |
| Haiku 4.5 | $0.00046 | $0.00046 |
Grade A, and why
mcp-server-vegalite-viewer CLAUDE.md 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 9d 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
Claude Code Configuration
This file contains information for Claude Code about how to work with this project.
Project Overview
A data visualization MCP (Model Context Protocol) server using Vega-Lite and FastMCP. Visualizations are rendered directly in the chat using MCP Apps — no browser window required.
Development Setup
Initial Setup
python -m pip install build uv
uv venv
.venv\Scripts\activate
uv pip install -e .
Running the Server
mcp-server-vegalite-viewer
or
python -m mcp_server_vegalite_viewer
Testing Outside Project Environment
uvx --from "W:\GitLab\mcp-server-vegalite-viewer" mcp-server-vegalite-viewer
Add --reinstall flag when testing changes:
uvx --from "W:\GitLab\mcp-server-vegalite-viewer" --reinstall mcp-server-vegalite-viewer
Build Commands
React App (run after changing files in app/)
cd app && npm install && npm run build
The build output is committed to src/mcp_server_vegalite_viewer/resources/viewer_app.html.
Python Package Building
uv build
Type Checking
pyright
Key Files
src/mcp_server_vegalite_viewer/mcp_server.py- MCP server: tools, MCP App resourcesrc/mcp_server_vegalite_viewer/__main__.py- CLI entry pointsrc/mcp_server_vegalite_viewer/resources/viewer_app.html- Built MCP App (React + Vega-Embed, do not edit manually)app/- React + Vite source for the MCP Appapp/src/App.tsx- React component that renders Vega-Lite specs
Dependencies
- Python 3.12+
- fastmcp >= 3.0.0
Testing
pytest -v
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.
- 9d ago First seen · 84 lines · 460 tokens per session scan A 8e4a2e07b323
mcp-server-vegalite-viewer CLAUDE.md is an instructions file published in the GitHub repository stephaneberle9/mcp-server-vegalite-viewer (1 stars, last pushed 4mo ago), licensed MIT. It adds 460 tokens to every session, about $0.0023 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 2026-08-31.
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