Anthropic takes Files API, Admin API user management, and Agent Skills out of beta

Anthropic has simultaneously graduated three previously-beta pieces of the Claude Platform to general availability: the Files API, Admin API user-management endpoints for Claude Enterprise organizations, and Agent Skills with the Skills API.

What's new

According to the Claude Platform release notes for August 19, 2026, "the Files API is now generally available on the Claude API," removing the requirement for the files-api-2025-04-14 beta header on /v1/files endpoints and on Messages API requests that reference an uploaded file. GA brings concrete new limits and behavior: storage is capped at 1 TB per organization, the rate limit is set at 500 requests per minute, and file objects now report an expires_at field tied to a configurable expires_in_seconds value set at upload time. Listing files also gains page/next_page pagination and an ids[] filter.

Alongside Files, the release notes confirm the Admin API's user-management endpoints for Claude Enterprise organizations — covering members, invites, groups, and custom roles — are now GA, dropping the anthropic-beta: ce-user-management-2026-07-13 header requirement (existing requests that still send it continue to work unchanged).

A third graduation landed the same day: "Agent Skills and the Skills API (/v1/skills) are now generally available on the Claude API," removing the need for the skills-2025-10-02 beta header, including for Messages API requests that load Skills through the container parameter.

Anthropic also shipped smaller additions on the same date, including the ability to restrict a Managed Agents session's web_search and web_fetch tools to allowed or blocked domains, memory-store attachment support for self-hosted sandbox sessions, and a redesigned session viewer in the Claude Console with a timeline minimap and per-tool cost inspector.

Context

All three features had been sitting in beta for months. The Files API beta header (files-api-2025-04-14) dates back over a year; Agent Skills launched in beta on October 2, 2025; and Admin API user management for Claude Enterprise only entered beta on July 14, 2026 — meaning it moved from beta to GA in roughly five weeks, a notably fast graduation. The batch also follows Anthropic's August 18 rename of Workbench to Playground, part of a broader push this month to harden developer-facing tooling around the Claude API ahead of what the company has signaled is a run-up to an IPO.

Why it matters

GA status changes the calculus for engineering teams building production systems on Claude: beta headers can be pulled without notice, while GA endpoints carry Anthropic's stability guarantees and, in the Files API's case, hard operational limits (1 TB storage, 500 req/min) that teams now need to design around rather than guess at. The Admin API graduation is particularly significant for Claude Enterprise customers doing programmatic user and access management, since it had been the newest of the three betas. Together, the changes point to Anthropic prioritizing enterprise-readiness — data governance, file handling, access control, and reusable Skills — as a distinct workstream alongside model releases themselves.