Claude API Builder

Build, debug, and optimize Claude API and Anthropic SDK applications. Handles prompt caching, tool use, batch processing, thinking, compaction, and model migration between Claude versions.

Comprehensive skill for building LLM-powered applications with the Claude API. Covers the official Anthropic SDK across languages, prompt caching optimization, tool use patterns, batch processing, thinking/extended thinking, model migration, and all Claude features. Detects project language and provides language-specific guidance.

When to use

Use when building apps with the Claude API, Anthropic SDK, or migrating between Claude model versions.

Examples

Add prompt caching

Implement prompt caching for reduced latency and cost

Add prompt caching to my Claude API app to reduce costs

Migrate model version

Upgrade from Claude 4.5 to 4.6 with feature compatibility

Migrate my app from Claude 4.5 to Claude 4.6