claude-api

Guide Claude Messages API usage for structured JSON outputs and error prevention.

5|2|Updated Jan 24, 2026
One-click install
npx skills add https://github.com/s1366560/agi-demos --skill claude-api-s1366560
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: claude-api
Source: https://github.com/s1366560/agi-demos/tree/main/.memstack/skills/claude-api
Command: npx skills add https://github.com/s1366560/agi-demos --skill claude-api-s1366560

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers build robust applications using the Claude Messages API by providing detailed guidance on structured outputs, error prevention, prompt caching, streaming, and tool use, significantly reducing development time and API costs.

Core Features & Use Cases

  • Guaranteed JSON Outputs: Ensure Claude's responses strictly adhere to your defined JSON schema.
  • Error Prevention: Avoid 16 common API errors, including rate limiting, streaming issues, and model deprecations.
  • Cost Savings: Implement prompt caching for up to 90% cost reduction.
  • Use Case: When building a chatbot that needs to extract specific user information (like contact details or preferences) in a structured JSON format, this Skill ensures the output is always valid and prevents common API pitfalls.

Quick Start

Use the claude-api skill to extract contact information from the provided text using structured JSON output.

Frequently Asked Questions about claude-api

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I get guaranteed JSON schema validation from the Claude API?

To get guaranteed JSON schema validation from the Claude API, you must use the structured outputs feature. This ensures Claude's responses strictly adhere to your defined JSON schema, preventing parsing errors when extracting specific user information like contact details.

How does prompt caching reduce Claude API costs?

Prompt caching reduces Claude API costs by reusing previously processed context, achieving up to 90% cost reduction. This mechanism is highly effective for AI agent development where large system prompts or tool definitions remain constant across multiple requests.

What is the best way to prevent common Claude API errors?

The best way to prevent common Claude API errors is to follow proactive error handling guidelines. This approach helps avoid 16 documented API errors, including rate limiting, streaming issues, and model deprecations, ensuring robust application performance.

How do I stream Server-Sent Events with the Claude Messages API?

You can stream Server-Sent Events (SSE) with the Claude Messages API by implementing the specific streaming patterns provided in the guidance. This allows your application to process Claude's responses incrementally, improving user experience during long generations.

Does the Claude API work with structured outputs for chatbot information extraction?

Yes, the Claude API works effectively with structured outputs for chatbot information extraction. When building a chatbot to extract specific user preferences or contact details, this feature ensures the output is always valid JSON and prevents common API pitfalls.

What are the limitations of prompt caching in the Claude API?

Limitations of prompt caching in the Claude API include managing dependencies on context window sizes and specific caching breakpoints. While it provides cost savings, developers must carefully structure their prompts and handle potential cache invalidation to maintain robust AI agents.