Fix Anthropic streaming and empty tool input errors #299
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The anthropic gem (1.12+) emits higher-level convenience events (TextEvent, ThinkingEvent, SignatureEvent, etc.) in addition to raw streaming events when using MessageStream. The :signature event was causing "Unexpected chunk type: signature" errors because it lacks a :snapshot method, causing it to fall through to the error handler. Added explicit handling for all higher-level convenience events: :text, :input_json, :citation, :thinking, :signature These are safely ignored since the actual content is already processed via the raw :content_block_delta events. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
For tools with no parameters, the streaming API may send empty
partial_json, resulting in an empty string input that would fail
JSON.parse with a syntax error.
Changes:
- Use json_buf.present? instead of just json_buf to skip empty strings
- For string inputs, check .present? before parsing and default to {}
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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I was trying to use the Anthropic provider with streaming and tool calling, and ran into a couple of bugs:
Streaming errors for higher-level gem events - The
anthropicgem emits convenience events (SignatureEvent,ThinkingEvent, etc.) that were causing"Unexpected chunk type: signature"errors.Empty tool input JSON parsing - For tools with no parameters, empty
partial_jsonwould causeJSON.parsesyntax errors.These two changes resolved the issue locally for me. They were devised by Claude, so please look at it a little more closely - but they seem to make sense to me and as I said I have tested this on my end. Happy to make changes as necessary.
Cheers!