Borrowing it
Nothing to install: this file belongs to Shaumik-Ashraf/mcp-fhir-patient-index. 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/Shaumik-Ashraf/mcp-fhir-patient-index/main/CLAUDE.mdgit clone --depth 1 https://github.com/Shaumik-Ashraf/mcp-fhir-patient-indexWrote 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/shaumik-ashraf/mcp-fhir-patient-index/claude-md)<a href="https://agentmods.dev/instructions/shaumik-ashraf/mcp-fhir-patient-index/claude-md"><img src="https://agentmods.dev/badge/instructions/shaumik-ashraf/mcp-fhir-patient-index/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/shaumik-ashraf/mcp-fhir-patient-index/claude-md"><img src="https://agentmods.dev/badge/instructions/shaumik-ashraf/mcp-fhir-patient-index/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 | $0.01105 | $0.01105 |
| Opus 5 | $0.00553 | $0.00553 |
| Sonnet 5 | $0.00221 | $0.00221 |
| Haiku 4.5 | $0.00111 | $0.00111 |
Grade A, and why
mcp-fhir-patient-index 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 12d 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 — 109 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 FHIR Patient Index is a Rails 8 application implementing a Master Patient Index (MPI) with:
- A FHIR R4 conformant REST API for patient data
- Model Context Protocol (MCP) server for LLM integration
- Web UI for patient CRUD and record linking/deduplication
- Patient identity matching and record linkage workflow
Tech stack: Ruby 3.3.7, Rails 8.0, SQLite3, Hotwire (Stimulus + Turbo), Bootstrap 5.3, ESBuild, Sass.
Commands
Setup
yarn install && bundle
rails db:migrate
rails assets:precompile
Development
# Start all services (web + JS/CSS watchers)
bin/dev # uses Procfile.dev
# Or individually:
rails server
yarn build --watch
yarn watch:css
Testing
bundle exec rspec # all tests
bundle exec rspec spec/models/ # models only
bundle exec rspec spec/path/to/file_spec.rb # single file
bundle exec rspec spec/path/to/file_spec.rb:42 # single example
Linting & Security
bundle exec rubocop # Ruby linter (Rails Omakase style)
bundle exec rubocop -a # auto-fix safe violations
./bin/brakeman # security scan
yarn herb:lint # ERB/view linting
yarn herb:format # format views
Frontend builds
yarn build # bundle JS
yarn build:css # compile Sass + autoprefixer
FHIR Conformance Testing (Inferno)
cd inferno-tests
bundle install
bundle exec inferno services start
bundle exec inferno start # https://localhost:4567
bundle exec inferno services stop
MCP Inspector
npx @modelcontextprotocol/inspector
# Connect to: http://localhost:3000/mcp/v20250618
Architecture
URL Namespaces
/fhir/r4/— FHIR R4 API (metadata, Patient read/search)/mcp/v20250618/— MCP HTTP streamable transport endpoint/patients/— Web UI patient CRUD/patient_joins/— Record linking workflow/settings/— Application settings
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.
- 12d ago First seen · 109 lines · 1,105 tokens per session scan A 16796c3a4e0a
mcp-fhir-patient-index CLAUDE.md is an instructions file published in the GitHub repository Shaumik-Ashraf/mcp-fhir-patient-index (3 stars, last pushed 3mo ago), licensed MIT. It adds 1,105 tokens to every session, about $0.0055 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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