Anthropic has acquired Stainless, the SDK and MCP platform powering every official Anthropic SDK, in a deal valued at over $300 million. Also used by OpenAI, Google, and Cloudflare, Stainless will shut down its hosted services while its team and technology join Anthropic. The deal marks Anthropic's fourth acquisition in six months, completing key layers of its agent stack strategy.
Cursor is pushing coding agents out of the editor and into infrastructure. Its new SDK exposes the same runtime and harness behind Cursor itself, targeting CI/CD jobs, cloud execution, and embedded agent workflows inside other products.
OpenAI’s updated Agents SDK adds a model-native harness and native sandbox execution so agents can inspect files, run commands, edit code, and continue across longer tasks. It launches generally available in Python with support for sandbox providers including Blaxel, Cloudflare, Daytona, E2B, Modal, Runloop, and Vercel.
GitHub put the Copilot SDK into public preview on April 2, 2026, exposing the same runtime behind Copilot cloud agent and Copilot CLI. The SDK ships across five languages with tool use, streaming, permissions, OpenTelemetry, and BYOK support.
GitHub has moved the Copilot SDK into public preview, exposing the same agent runtime used by Copilot cloud agent and Copilot CLI. Developers can embed tool invocation, streaming, file operations, and multi-turn sessions directly into their own applications.
GitHub said on April 3, 2026 that developers can now build with the GitHub Copilot SDK in public preview. GitHub’s changelog says the SDK exposes the same agent runtime behind Copilot cloud agent and Copilot CLI, with support for custom tools, streaming, permissions, and BYOK across five languages.