Fix Anthropic system prompt not captured in traces #100
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The Anthropic Ruby SDK uses `system_:` (with trailing underscore) as the keyword argument name because `system` is a reserved method in Ruby (Kernel#system). The instrumentation was checking for `params[:system]` which never matched, causing system prompts to be silently dropped from Braintrust traces. Update both messages.rb and beta_messages.rb to use `params[:system_]` to match the official Anthropic Ruby SDK semantics.
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Issue
The Anthropic Ruby SDK uses
system_:(with trailing underscore) as the keyword argument name becausesystemis a reserved method in Ruby (Kernel#system).Our instrumentation implementation was checking for
params[:system]which never matched, causing system prompts to be silently dropped from Braintrust traces:Changes
Update both messages.rb and beta_messages.rb to use
params[:system_]to match the official Anthropic Ruby SDK semantics.Tested fix and we are now properly capturing
system_as the system prompt in our logs: