Source Intelligence

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.

All of v2.1.202 Home All releases olderv2.1.201 v2.1.203newer

Audio File Transcription via @-mention

What

Users can now @-mention audio files in their prompts. Claude Code sends the audio to Anthropic's speech-to-text service and injects a structured transcript into the conversation before Claude sees it.

Details
  • The transcript is wrapped in <audio-transcript filename="..."> XML with optional duration="M:SS" metadata
  • If transcription fails, an error variant is injected instead of silently dropping the attachment
  • The reference panel regex that handles pasted/attached items now recognizes [Audio #N] placeholders alongside existing [Image #N] and [Pasted text #N] entries
  • Governed by a new HIPAA-compatible permission: allow_voice_file_transcription
  • Audio attachments are now passed through in subagent message filtering alongside image attachments
Evidence

Audio transcription handler (search for "audio-transcript" and "The user @-mentioned the audio file")

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

See this entry in the whole of v2.1.202 →