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mcp-server-qrcode: Instructions file for Claude Code

CLAUDE.md

mcp-server-qrcode CLAUDE.md is an instructions file for Claude Code from jwalsh/mcp-server-qrcode. It costs 600 tokens per session, scanned A, original, MIT.

Development notes for an MCP server that creates QR codes. MCP is a standard way for coding tools to connect to external programs.

In plain words
What is it for?
Use it when setting up the project, running the QR-code server, building it, testing one file or case, linting, type-checking, formatting, or handling FreeBSD tool differences.
Why use it?
It gives contributors the commands and project rules needed to build, test, check, and run the server across Linux, macOS, and FreeBSD.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is jwalsh/mcp-server-qrcode's own configuration. It tells Claude Code how to work on mcp-server-qrcode itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mcp-server-qrcode configures →

not rated 5repo 3d ago A scan 600 tokens original MIT
View source ↗ jwalsh/mcp-server-qrcode
Reuse

Borrowing it

Nothing to install: this file belongs to jwalsh/mcp-server-qrcode. 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/jwalsh/mcp-server-qrcode/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/jwalsh/mcp-server-qrcode

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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<a href="https://agentmods.dev/instructions/jwalsh/mcp-server-qrcode/claude-md"><img src="https://agentmods.dev/badge/instructions/jwalsh/mcp-server-qrcode/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.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/jwalsh/mcp-server-qrcode/claude-md"><img src="https://agentmods.dev/badge/instructions/jwalsh/mcp-server-qrcode/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 600 This file is loaded in full into every session.
When invoked 600 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 original No closer match found 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00600 $0.00600
Opus 5.5 $0.00240 $0.00240
Sonnet 5.5 $0.00120 $0.00120
Haiku 4.5 $0.00060 $0.00060

Measured 2mo ago against content hash 21117e52c0dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-server-qrcode 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 2mo 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.

CLAUDE.md · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude's Development Notes for MCP QR Code Server

FreeBSD/BSD Compatibility

  • Make: Use gmake on FreeBSD/BSD systems (required - BSD make is incompatible)
  • Grep Issue: FreeBSD grep lacks some GNU features - may need to install GNU grep
  • The Makefile help target fails on FreeBSD due to grep incompatibility
  • If scripts fail, you may need to install GNU versions of utilities:
    • pkg install gnugrep for GNU grep (ggrep)
    • pkg install coreutils for GNU date (gdate) and other core utilities

Development Commands

  • Setup: gmake initialize then gmake setup (FreeBSD) or make initialize then make setup (Linux/macOS)
  • Development: gmake dev (FreeBSD) or make dev (Linux/macOS)
  • Run server: node build/main.js (works everywhere)
  • Build: npm run build (works everywhere)
  • Test all: npm test (works everywhere)
  • Test single file: node --experimental-vm-modules node_modules/jest/bin/jest.js src/__tests__/file.test.ts
  • Test single case: node --experimental-vm-modules node_modules/jest/bin/jest.js -t "test description"
  • Lint: npm run lint (works everywhere)
  • Type check: npm run typecheck
  • Format: npm run format
  • CI checks: npm run ci (prefer npm commands on FreeBSD)

Code Style Guidelines

  • TypeScript: Explicit return types required, minimize any usage
  • Formatting: 2 spaces, single quotes, semicolons, 120 chars max line length
  • Naming: camelCase for variables/functions, PascalCase for types/classes, UPPER_SNAKE_CASE for constants
  • Imports: Group by external → MCP SDK → project → Node.js std lib
  • Error handling: Use explicit error types and descriptive messages
  • Documentation: JSDoc for public APIs, inline comments for complex logic
  • Git commits: Use conventional commit format, ALWAYS add --no-gpg-sign flag

Server Entry Points

  • Production: build/main.js for MCP clients
  • Inspector: make inspector-dev
  • CLI: node build/cli.js for direct features

Documentation Strategy

  • Use org-mode ONLY (.org extension) for ALL documentation
  • Keep README.org high-level, DEVELOPERS.org for setup details
  • Use CONTRIBUTING.org for contribution guidelines

Read the full file on GitHub · 45 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.

  1. 2mo ago First seen · 45 lines · 600 tokens per session scan A 21117e52c0dc

Subscribe to this mod's changes

mcp-server-qrcode CLAUDE.md is an instructions file published in the GitHub repository jwalsh/mcp-server-qrcode (5 stars, last pushed 3d ago), licensed MIT. It adds 600 tokens to every session, about $0.0024 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 2026-08-31.

anthropicclaudemcpmcp-servernodejsqrcode
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