Borrowing it
Nothing to install: this file belongs to carlwestman/borsdata-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/carlwestman/borsdata-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/carlwestman/borsdata-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/instructions/carlwestman/borsdata-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/carlwestman/borsdata-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/carlwestman/borsdata-mcp-server/claude-md.svg" alt="Measured on agentmods" 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 | $0.01376 | $0.01376 |
| Opus 5 | $0.00688 | $0.00688 |
| Sonnet 5 | $0.00275 | $0.00275 |
| Haiku 4.5 | $0.00138 | $0.00138 |
Grade A, and why
borsdata-mcp-server 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 6d 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 — 132 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.
Project Overview
MCP (Model Context Protocol) server that exposes the Borsdata financial data API as tools for Claude. Built with TypeScript using @modelcontextprotocol/sdk (McpServer + StdioServerTransport).
Build & Run
npm install # Install dependencies
npm run build # Compile TypeScript to dist/
npm run dev # Run with tsx (development)
npm start # Run compiled dist/index.js
npm test # Run tests (vitest)
npm run lint # Lint (eslint)
Requires BORSDATA_API_KEY environment variable.
Architecture
src/
index.ts # Server entry point — creates McpServer, registers tools + resources, connects stdio
api/
client.ts # BorsdataClient — typed HTTP wrapper for all Borsdata API endpoints
rate-limiter.ts # Sliding window rate limiter (100 calls / 10 seconds)
types.ts # TypeScript interfaces for all API response shapes
tools/ # One file per domain, each exports a register function
instruments.ts # search_instruments, search_global_instruments, list_instruments, list_global_instruments, get_instrument_descriptions
stock-prices.ts # get_stock_prices, get_stock_prices_batch, get_latest_prices, get_latest_prices_global, get_prices_by_date, get_prices_by_date_global
reports.ts # get_reports, get_all_reports, get_reports_batch
kpi-screener.ts # get_kpi, get_kpi_all, get_kpi_updated
kpi-history.ts # get_kpi_history, get_kpi_history_batch, get_kpi_summary
holdings.ts # get_insider_holdings, get_short_positions, get_buybacks (Pro+)
calendar.ts # get_report_calendar, get_dividend_calendar
meta.ts # list_branches, list_countries, list_markets, list_sectors
stock-splits.ts # get_stock_splits
resources/ # MCP Resources — knowledge base for Claude to look up opaque IDs
index.ts # Registers all resources
api-guide.ts # Static: API overview, workflows, parameter reference
kpi-metadata.ts # Dynamic (cached): KPI ID → name lookup table from API
report-metadata.ts # Dynamic (cached): report field name mappings from API
utils/
errors.ts # BorsdataError class + toolError() helper for structured error responses
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.
- 6d ago First seen · 132 lines · 1,376 tokens per session scan A d8723d796c69
borsdata-mcp-server CLAUDE.md is an instructions file published in the GitHub repository carlwestman/borsdata-mcp-server (0 stars, last pushed 5mo ago), licensed MIT. It adds 1,376 tokens to every session, about $0.0069 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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