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Anthropic API Release Notes

3 items

Anthropic's own record of what changed in the API, dated entry by dated entry. Where a claim about a model, a limit, or an endpoint is settled.

platform.claude.com ↗

CLAUDEbrowsera toolset of its own
Agentsmedium signal

Claude gets a separate toolset for driving a browser

August 19 brought two changes to how Claude operates someone else's screen. The computer use tool moved to general availability as computer_toolset_20260801, with no beta header, actions grouped into a single turn, and zoom enabled from the start. Alongside it came browser_toolset_20260801, a separate set of 31 tools that works inside a browser you run yourself rather than across the whole desktop. The important difference is that this set reads the page accessibility tree and returns element references, so a click targets a reference such as ref_2 instead of a point in pixels — and that survives a layout shift.

Anthropicverified

CLAUDE CONSOLEPlaygroundWorkbench is gone
Toolsweak signal

Workbench becomes Playground, and the old tool is gone

Since August 18, Workbench in the Claude console is called Playground and has been rebuilt from the ground up. The new tool supports every Messages API parameter and ships with templates that show how code execution and web search work. For every run it displays the complete request exactly as the SDK sends it, along with the raw API response, which makes it a way to learn the API rather than only a place to try prompts. The old Workbench shut down on August 17, saved prompts and evaluations do not carry over, and the experimental prompt tools APIs for generating and improving prompts were withdrawn with it.

Anthropicverified

CLAUDE APIGAFiles, Agent Skills, Admin API
Agentsstrong signal

Files, Agent Skills, and the Admin API leave beta

On August 19, Anthropic moved a large part of the Claude platform from beta to general availability. The Files API no longer requires a beta header and gains file expiry through expires_in_seconds, pagination, and filtering by identifier, alongside a terabyte of storage per organization and a limit of 500 requests per minute. Agent Skills and the accompanying Skills API also became generally available, so skills now load through the Messages API without a single beta header. Managed Agents gain allow and block lists of domains for search and content fetching, and the session viewer in the console was redesigned with a timeline minimap and an Inspector panel. Anyone building an agent over client content gets three critical parts of the API that stop being a moving target.

Anthropicverified