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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.116 20 Apr 2026

SDK and Agent Improvements

Voice Mode promoted from @internal hidden feature to public user-facing capability
Message attachments now support pre-resolved file objects ({file_uuid, file_name, size, is_image}) alongside file paths
New skills configuration option for ClaudeAgentOptions
Five new getter methods on app state API (getToolPermissionContext, etc.)
New getSupportedExtensions API method
New message_rated tool for SDK hosts to surface thumbs up/down ratings
Cache control strategy changed from query-source-based to TTL-based caching

Evidence

Voice Mode promotion (search for "Voice mode settings") — description changed from @internal; attachments (search for "file_uuid")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.116 →