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It ships the agent loop, built-in tools, subagents, hooks, sessions, and MCP support, and runs on Claude models only.",{"slug":39,"display_name":40,"description":41},{"category_id":14,"name":110,"slug":111},{"subcategory_id":113,"name":114,"slug":115},[245],{"category_id":14,"name":110,"slug":111,"is_primary":3,"display_order":7},[247],{"subcategory_id":113,"name":114,"slug":115,"category_id":14,"is_primary":3,"display_order":7},[249,252,255,259,263],{"tag_id":250,"name":65,"slug":66,"tag_type":251},1,"technology",{"tag_id":55,"name":253,"slug":254,"tag_type":251},"TypeScript","typescript",{"tag_id":256,"name":71,"slug":257,"tag_type":258},11,"open-source","feature",{"tag_id":260,"name":261,"slug":262,"tag_type":258},12,"Self-hostable","self-hostable",{"tag_id":264,"name":265,"slug":266,"tag_type":258},16,"AI-powered","ai-powered",{"learning_curve":268,"flexibility":269,"performance":270,"popularity":271,"portability":272},"A single query call with built-in tools gives a working agent in a few lines, and anyone who has used Claude Code already knows the concepts of subagents, hooks, and permissions.","Hooks, subagents, skills, custom MCP tools, and self-hosted sandboxes let teams shape almost any agent, but the harness is opinionated and the model choice is fixed to Claude.","It is the same harness Claude Code runs on, and Claude models lead agentic coding and tool-use evaluations, so agents built on it inherit strong long-horizon results.","About 8K stars on the Python repo plus a similar TypeScript package, and it is the documented way to build on Claude Code, with a large ecosystem of third-party apps built on top of it.","The SDK itself is open source and runs anywhere, but agents are tied to Claude models, reached through Anthropic or the cloud providers that resell them.","2026-10-01",{"vendor_id":83,"name":275,"slug":276,"website_url":277,"logo_url":278,"logo_bg":106},"Anthropic","anthropic","https:\u002F\u002Fwww.anthropic.com","https:\u002F\u002Fassets.tekyous.dev\u002Flogos\u002Fvendors\u002Fanthropic.svg","https:\u002F\u002Fplatform.claude.com\u002Fdocs\u002Fen\u002Fagent-sdk\u002Foverview","https:\u002F\u002Fgithub.com\u002Fanthropics\u002Fclaude-agent-sdk-python","The Claude Agent SDK packages the **agent harness behind Claude Code** as a library, so developers can build their own agents on the same loop, tools, and context management rather than writing them from scratch. It was released as the Claude Code SDK and renamed at its 1.0 release in September 2025, reflecting that teams use it for research, operations, support, and data agents as well as coding. It is available as a Python package and a TypeScript package.\n\nOut of the box an agent gets Claude Code's **built-in tools** for reading and editing files, running shell commands, searching, and fetching from the web, plus automatic context compaction for long sessions. On top of that sit the primitives teams use to shape behaviour: subagents for delegating work in isolated contexts, lifecycle hooks that run code before or after tool calls, permission modes, skills, slash commands, resumable sessions, and custom tools exposed as in-process MCP servers or connected from external MCP servers. 2026 releases added dynamic workflows that fan one task out to many parallel subagents, and self-hosted sandboxes with MCP tunnels for teams that need tool execution on their own infrastructure.\n\nUnlike provider-agnostic frameworks such as LangChain or the OpenAI Agents SDK, it is **Claude-only**. It authenticates with an Anthropic API key or through Amazon Bedrock, Google Vertex AI, or Microsoft Foundry, and it can also draw on a Claude subscription's usage limits. The SDK code is open source and free; the cost is the Claude usage it consumes. Anthropic's hosted Managed Agents offering covers teams that would rather not run the agent loop themselves.\n\nIt suits teams that want a **proven, batteries-included agent** with file and shell access and are happy to standardise on Claude. 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