What is FinvizMCP CLAUDE.md?

A repository instruction file for developing Psichico/FinvizMCP, a server that provides financial screening tools from Finviz. It documents setup, commands, testing, and code-quality checks.

Use it when setting up the project, running its server, testing changes, formatting code, checking types, or linting.

It gives the coding agent the project’s expected commands and working conventions, reducing guesswork when changing the repository.

How Psichico/FinvizMCP configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Psichico/FinvizMCP. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Psichico/FinvizMCP/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Psichico/FinvizMCP

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/psichico/finvizmcp/claude-md.svg)](https://agentmods.dev/instructions/psichico/finvizmcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/psichico/finvizmcp/claude-md"><img src="https://agentmods.dev/badge/instructions/psichico/finvizmcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,652 This file is loaded in full into every session.

When invoked 1,652 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 100% copy Near-identical to another mod in the catalogue.

Token cost

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	$0.01652	$0.01652
Opus 5	$0.00826	$0.00826
Sonnet 5	$0.00330	$0.00330
Haiku 4.5	$0.00165	$0.00165

Measured 7d ago against content hash 06f32ce7d583, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

FinvizMCP 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 7d 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.

Origin

This is a copy

100% identical to finviz-mcp-server CLAUDE.md — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 239 lines

How it starts

The opening of the file, as written. The whole thing — 239 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Development Commands

Environment Setup

# Create virtual environment with Python 3.11+
python3.11 -m venv venv
source venv/bin/activate  # On macOS/Linux
# or
venv\Scripts\activate     # On Windows

# Install dependencies in development mode
pip install -e .

Running the Server

# Start the MCP server (stdio mode)
finviz-mcp-server

# Alternative: Run directly with Python
python3 run_server.py

# Alternative: Run as module
python3 -m src.server

Testing

# Basic functionality test
python3 test_basic.py

# All features test
python3 test_all_features.py

# Live features test (requires API access)
python3 test_live_features.py

Code Quality

# Code formatting (if available)
black src/ --line-length 88

# Type checking (if mypy configured)
mypy src/

# Linting (if flake8 configured)
flake8 src/

Architecture Overview

Core Components

Server Architecture (src/server.py)

FastMCP-based MCP server with 20+ financial screening tools
Each tool is a decorated function that returns List[TextContent]
Comprehensive error handling and logging for all tools
Validates inputs using src/utils/validators.py

Client Architecture (src/finviz_client/)

base.py: Core HTTP client with rate limiting and retry logic
screener.py: Stock screening functionality with various filters
news.py: News retrieval and processing
sector_analysis.py: Sector and market performance analysis

Data Models (src/models.py)

StockData: Comprehensive stock information with 70+ fields
NewsData: News article information
SectorPerformance: Sector performance metrics
EarningsData: Earnings-specific data
UpcomingEarningsData: Pre-earnings analysis data
Field mappings for Finviz API integration

Utilities (src/utils/)

validators.py: Input validation for all parameters
formatters.py: Output formatting utilities

Read the full file on GitHub · 239 lines

Changes

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.

7d ago First seen · 239 lines · 1,652 tokens per session scan A 06f32ce7d583

Subscribe to this mod's changes

FinvizMCP CLAUDE.md is an instructions file published in the GitHub repository Psichico/FinvizMCP (0 stars, last pushed 2mo ago), licensed MIT. It adds 1,652 tokens to every session, about $0.0083 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to finviz-mcp-server CLAUDE.md, differing in 0 lines, and is treated as a copy.

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