claude-api

The claude-api skill provides comprehensive technical support for building resilient, high-performance applications using the Anthropic Claude Messages API. It is designed for software engineers and agent developers who need to implement reliable data extraction, function calling, and optimized token usage. The skill focuses on the latest SDK patterns (v0.71+) and addresses the critical transition from Claude 3.x to 4.x model architectures, ensuring your integration remains compatible and cost-efficient. By leveraging this skill, developers can effectively manage complex agentic workflows, troubleshoot latency issues caused by grammar compilation, and implement robust semantic validation layers on top of structured JSON outputs.

• Guaranteed JSON schema compliance using output_format for reliable data extraction and tool parameter validation.

• Advanced prompt caching strategies to achieve up to 90% cost savings on long-context requests.

• Streaming SSE implementation patterns with custom parsing logic to prevent common integration errors.

• Comprehensive model deprecation tracking, including the shift away from Claude 3.5/3.7 to Claude 4.5 Opus and Sonnet.

• Built-in error prevention for 16 documented issues, including MCP timeouts, rate_limit_error, and model-specific hallucinations.

• Practical guidance for pre-warming schemas to eliminate first-request latency spikes.

• Always use this skill when configuring Anthropic client instances, defining tool schemas, or debugging API response errors.

• Integrate semantic validation checks to ensure that while JSON structure is guaranteed, the content logic remains accurate.

• Utilize specific beta headers and model identifiers listed in the documentation for stable performance in production environments.

• Follow the provided patterns for handling thinking blocks and context management when building complex agent loops.

• When troubleshooting, verify your SDK version against the recommended v0.71.2 baseline to ensure access to the latest structured output features and deprecation handling.