---
title: "Anthropic SDK beta headers removal for files and skills: 2026-08-27 | Harbyn"
description: "Anthropic SDK beta headers removal for files and skills, announced Aug 27, 2026; replacement: client.files, client.skills."
canonical: "https://harbyn.com/changes/anthropic/2026-08-27-sdk-beta-headers-removal-for-files-and-skills"
last-updated: 2026-09-21
---

# Anthropic SDK beta headers removal for files and skills

Markdown version of <https://harbyn.com/changes/anthropic/2026-08-27-sdk-beta-headers-removal-for-files-and-skills>.

Deprecation - Anthropic. medium severity. Announced.

Python, TypeScript, Go, Java, Ruby, and C# SDKs no longer send files-api-2025-04-14 and skills-2025-10-02 beta headers by default.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Anthropic](https://harbyn.com/vendors/anthropic.md) |
| Kind | Deprecation |
| Severity | medium |
| Status | Announced |
| Announced | Aug 27, 2026 |
| Added to Harbyn | Sep 21, 2026 |
| Lead time | No dated deadline |
| Symbols | `client.beta.files`, `client.beta.skills` |
| Replacement | `client.files`, `client.skills` |
| Review | Automated, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Anthropic, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://platform.claude.com/docs/en/release-notes/overview.md> (changelog, fetched 2026-09-21 22:00 UTC, sha256 `1341e592634fe9ba5dccb842bd5ca4f82bf86e59b168e63120ef72c7cb7c8b00`)

## Related changes

### More from Anthropic

- [Claude Enterprise Admin, Analytics and Compliance API requests should send the anthropic-version header](https://harbyn.com/changes/anthropic/2026-09-01-enterprise-admin-and-compliance-api-requests-must-send-api-version-header.md) (Behavior change, announced Sep 1, 2026)
- [Tool choice restriction on Fable 5.1 and Mythos 5.1](https://harbyn.com/changes/anthropic/2026-09-01-tool-choice-restriction-on-fable-5-1-and-mythos-5-1.md) (Behavior change, announced Sep 1, 2026)
- [Fingerprint storage requires the diagnostics object](https://harbyn.com/changes/anthropic/2026-09-09-fingerprint-storage-requires-the-diagnostics-object.md) (Behavior change, announced Sep 9, 2026)
- [Cache diagnostics is out of beta](https://harbyn.com/changes/anthropic/2026-09-23-cache-diagnostics-is-out-of-beta.md) (Behavior change, announced Sep 23, 2026)

### Changes at other vendors

- [AWS Lambda: Python 3.10 runtime deprecation](https://harbyn.com/changes/aws-lambda/2026-10-08-python-3-10-runtime-deprecation.md) (effective Oct 31, 2026)
- [Jira / Atlassian Cloud: Atlassian Analytics dashboard subscriptions being removed](https://harbyn.com/changes/atlassian-jira/2026-08-10-atlassian-analytics-dashboard-subscriptions-being-removed.md) (effective Nov 2, 2026)
- [Google Cloud Run and Functions: .NET 8 runtime deprecation](https://harbyn.com/changes/google-cloud/2026-10-08-net-8-runtime-deprecation.md) (effective Nov 10, 2026)
- [GitHub: X-GitHub-Stateless-S2S-Token header ignored from 2026-11-30](https://harbyn.com/changes/github/2026-10-02-x-github-stateless-s2s-token-header-ignored-from-2026-11-30.md) (effective Nov 30, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)