Error when running Anthropic plugin and models

[nechmads]

Affected plugin(s)

• Anthropic
• Azure OpenAI
• Cohere
• Convex
• Groq
• Mistral
• OpenAI

Describe the bug
When running generation using dotprompt and the Anthropic plugin, I get the error: roles must alternate between "user" and "assistant", but found multiple "user" roles in a row.
Same code works fine when running with OpenAI plugin or Gemini models.

To Reproduce
Run generation with Claude models.

Expected behavior
Generation should succeed

Screenshots

Plugin(s) version:
0.10.1

Genkit version:
0.5.13

[nechmads]

If I add a {{ role "user" }} somewhere in the prompt, the error changed to "role system doesn't map to an Anthropic role.".

Seems it all comes down to the {{ role "system" }} clause when used in prompt templates. The plugin doesn't translate it well to the Claude API.

[MichaelDoyle]

Hey @nechmads can you share an example prompt and/or code. I think I see what you are likely running into - but want to verify. Vertex AI also supports Anthropic, so I'd like to verify it in both places if possible.