Anthropic Took Files, Skills and Enterprise User Management to GA. The New Capability Is the One Nobody Mentioned.

Anthropic's platform release notes for 19 August moved three things out of beta at once: the Files API, Agent Skills and the /v1/skills endpoint, and the Admin API user-management endpoints for Claude Enterprise organisations. In each case the corresponding anthropic-beta header is no longer required.

What GA actually brings

The Files API drops files-api-2025-04-14. Storage is 1 TB per organization and the rate limit is 500 requests per minute. The GA response format adds file expiration — set expires_in_seconds on upload, read expires_at on the object — plus page/next_page pagination and an ids[] filter when listing. Agent Skills drops skills-2025-10-02, including on Messages API requests that load skills through the container parameter. Enterprise user management drops ce-user-management-2026-07-13, ending a beta that began on 13 July.

What the common telling gets wrong

Two opposite errors. Calling this a launch is wrong — the Files API beta header is dated April 2025, so this is a stability commitment on something developers have been using for well over a year. But calling it cosmetic is also wrong, and misses the detail that will bite: requests sent without the beta header now receive the new response format, while requests that still send it keep the old one. There are two live response shapes, selected by the presence of a header, and the safe-looking move — deleting a header you no longer need — is the one that changes the payload.

The item that got no coverage

The same entry adds allowed_domains and blocked_domains to the web_search and web_fetch tools in the agent_toolset_20260401 configs array. That is not a convenience feature. An agent that can fetch arbitrary URLs is an exfiltration path, and a domain allowlist is the specific control a security team asks for before letting one browse. web_fetch also gains max_content_tokens; web_search gains user_location.

Also shipped

Managed Agents sessions running in self-hosted sandboxes can now attach memory stores, which the Python, TypeScript and Go SDK workers mount at mount_path and sync back. The Console session viewer was redesigned with a timeline minimap, a transcript grouped by model request, and an Inspector panel covering cost, raw events, per-tool statistics and per-thread activity.