●Change8

Migrating to Anthropic SDK v0.84.0

Version v0.84.0 introduces 1 breaking change. This guide details how to update your code.

Released: 2/25/2026

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Breaking Changes
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Migration Steps
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Affected Symbols

⚠️ Check Your Code

If you use any of these symbols, you need to read this guide:

api.array_format

Breaking Changes

●Issue #1

The API parameter `array_format` has been changed to use brackets (`[]`) for array serialization. If you were relying on a different format, you may need to update how you construct API requests that include arrays.

Migration Steps

  1. 1
    If you manually construct API requests that include arrays, ensure your serialization logic now uses bracket notation (e.g., `param[]=value1&param[]=value2`).

Release Summary

Version 0.84.0 updates API serialization for arrays to use bracket notation and introduces new conversion helpers for MCP tools and prompts. The project documentation has also been rebranded to Claude SDK.

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View the full release notes and all changes for Anthropic SDK v0.84.0.

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