Overview
We have just published two companion developer guides covering security best practices for building with Anthropic’s Claude AI. Both guides are freely available on resource.7312.us and are written specifically for developers who are new to the Claude ecosystem — no prior AI security expertise required.
Each guide focuses on a distinct integration model with its own threat landscape, checklist, and practical code patterns. Together they cover the full spectrum: back-end API applications and the agentic terminal environment.
Guide 1 — Secure Development with Claude AI (API)
This guide is located at: https://resource.7312.us/guide/secure-claude-dev.html
INTENDED AUDIENCE
Developers integrating the Claude HTTP API into back-end applications — side projects, SaaS products, or production services. Assumes familiarity with REST APIs and server-side code but no prior experience with AI or large language model security.
WHAT IT COVERS
- Threat landscape — the four primary attack categories developers encounter (prompt injection, data leakage, exposed API keys, over-permissions)
- API key security — server-side architecture patterns and what never to do in client code
- Prompt injection defense — safe input delimiting, output validation, and a real-world incident walkthrough (the ‘Claudy Day’ attack chain, March 2026)
- Data minimization — principles for reducing PII and sensitive data sent to the model
- Least privilege & agentic safety — scoping tool permissions and requiring human confirmation for irreversible actions
- Cost protection — loop guards, max_tokens enforcement, and spending cap configuration
- Pre-ship tips — versioning system prompts, sanitizing external inputs, capping every loop
INTERACTIVE CHECKLIST
22 actionable items across 6 categories, each tagged Critical / Important / Good Practice. Progress is tracked live in the browser with a per-category progress bar — no account or installation required.
- API key security (4 items)
- Input validation & prompt injection (4 items)
- Data minimization & privacy (4 items)
- Least privilege & agentic safety (3 items)
- Operational & output safety (4 items)
- Cost & rate limit protection (3 items)
WHAT MAKES IT UNIQUE
Most API security resources are generic. This guide is written exclusively for the Claude API threat model, includes an annotated flow diagram showing the only safe architecture for API key handling, and features a documented real-world injection attack against claude.ai with developer take-aways. Syntax-highlighted code examples show the vulnerable pattern alongside the correct one side by side.
Guide 2 — Secure Development with Claude Code (CLI)
This guide is located at https://resource.7312.us/guide/secure-claude-code.html
INTENDED AUDIENCE
Developers using Claude Code — the agentic terminal tool — in day-to-day coding workflows, on shared developer machines, or in CI/CD pipelines. Suitable for engineers at any level who want to understand the specific risks of running an AI agent with direct access to their filesystem, shell, and external services.
WHAT IT COVERS
- Claude Code’s unique attack surface — why it requires a fundamentally different security mindset than a chat API
- File access control — using .claudeignore to block sensitive files (secrets, keys, internal configs) from ever entering the model’s context
- Permission configuration — locking down shell execution, web fetch, and file write permissions in settings.json
- MCP server security — auditing third-party MCP integrations, the npm supply-chain risk, and safe scoping of MCP tool permissions
- Indirect prompt injection — how malicious content in files, web pages, or API responses can hijack an agentic session
- CLAUDE.md as a security policy — using the project instructions file to enforce boundaries and document approved commands
INTERACTIVE CHECKLIST
20 actionable items across 5 categories, each tagged Critical / Important / Good Practice. Same live browser tracking as the API guide — check off items as you configure your environment.
- File access control (4 items)
- Permission configuration (4 items)
- MCP server security (4 items)
- Injection defense & review (4 items)
- CLAUDE.md & operational hygiene (4 items)
WHAT MAKES IT UNIQUE
Claude Code operates with the same filesystem and shell access as the developer running it — a threat model that no existing web API security guide addresses. This is the first developer-facing resource to document Claude Code’s permission model, .claudeignore syntax, and the indirect injection risk in agentic workflows end-to-end. It includes a real-world incident case study and CLAUDE.md template patterns that can be copied directly into any project.
THESE ARE FREE FROM ‘7312.US’
Both guides are live now at resource.7312.us. They share a consistent visual color-coded severity system (Critical in red, Important in amber, Good Practice in green) used identically across both checklists.
These FREE guides are plain HTML — they load fast, work offline once cached, and the checklists store no data externally. The checklists are also available below as PDF.
