{"version":"2.1.51","anchor":"built-in-claude-api-agent-sdk-skill-in-development","canonical_anchor":"built-in-claude-api-agent-sdk-skill-in-development","heading":"Built-in Claude API \/ Agent SDK Skill [In Development]","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.51\/e\/built-in-claude-api-agent-sdk-skill-in-development","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.51","markdown":"### Built-in Claude API \/ Agent SDK Skill [In Development]\n\n**What**\n\nA comprehensive built-in skill for helping users build LLM-powered applications with Claude, including code examples for Python, TypeScript, Java, Go, Ruby, C#, PHP, and cURL.\n\n**Status**\n\nAdded as part of the skills system, contains full documentation for:\n\n- All current Claude models (Opus 4.6, Sonnet 4.6, Haiku 4.5)\n- Adaptive thinking, effort parameter, compaction\n- Tool use, streaming, batches, files API\n- Agent SDK patterns\n- Language-specific SDK examples including a new C# SDK section\n\n**Evidence**\n\nLarge string literal beginning with `\"# Building LLM-Powered Applications with Claude\"` (search for `\"Building LLM-Powered Applications with Claude\"`)"}