[BOT ISSUE] Bedrock: add missing Writer Palmyra X4 and Palmyra X5 models

[github-actions]

Summary

Amazon Bedrock offers Writer Palmyra X4 and Palmyra X5 as on-demand (Standard tier) text models, but neither has any entry in model_list.json. Writer is an entirely missing provider family on Bedrock in the catalog.

Missing models

1. Writer Palmyra X4 (writer.palmyra-x4-v1:0)

• Model ID (bedrock-runtime): writer.palmyra-x4-v1:0
• Geo inference ID: us.writer.palmyra-x4-v1:0
• Format: converse
• Flavor: completion
• Context window: 128,000 tokens
• Max output tokens: 8,192
• Multimodal: no (text only)
• Lifecycle: Active (EOL no sooner than 2026-04-28)
• Tiers: Standard
• Regions: us-east-1, us-east-2, us-west-1, us-west-2 (Geo US)

2. Writer Palmyra X5 (writer.palmyra-x5-v1:0)

• Model ID (bedrock-runtime): writer.palmyra-x5-v1:0
• Geo inference ID: us.writer.palmyra-x5-v1:0
• Format: converse
• Flavor: completion
• Context window: 128,000 tokens
• Max output tokens: 8,192
• Multimodal: no (text only)
• Lifecycle: Active (EOL no sooner than 2026-04-28, launched Jan 21, 2026)
• Tiers: Standard
• Regions: us-east-1, us-east-2, us-west-1, us-west-2 (Geo US)

Note

Writer also has Palmyra Vision 7B (writer.palmyra-vision-7b) — a multimodal model (image+text input) with 4K context / 4K output, available across 14 regions with Standard/Priority/Flex tiers. Consider adding it as well.

Sources

1. Bedrock models-at-a-glance: https://docs.aws.amazon.com/bedrock/latest/userguide/model-cards.html (lists Writer provider with Palmyra X4, X5, Vision 7B)
2. Bedrock model cards: https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-writer-palmyra-x4.html and model-card-writer-palmyra-x5.html
3. Bedrock provider page: https://aws.amazon.com/bedrock/model-choice/ (lists Writer as a provider)

Verification checklist

• Model IDs confirmed in ≥2 independent official sources (model card + models-at-a-glance)
• Model ID format matches Bedrock convention (provider.model-version:0)
• Not already present in model_list.json (confirmed via grep for writer.)
• Standard/on-demand tier confirmed
• Pricing needs manual verification from Bedrock pricing page

{
  "provider": "bedrock",
  "models": ["writer.palmyra-x4-v1:0", "writer.palmyra-x5-v1:0"],
  "action": "add",
  "catalog_file": "packages/proxy/schema/model_list.json",
  "schema_reference": "packages/proxy/schema/models.ts"
}

[github-actions]

Prepared catalog updates for writer.palmyra-x4-v1:0, us.writer.palmyra-x4-v1:0, writer.palmyra-x5-v1:0, us.writer.palmyra-x5-v1:0. Added models: writer.palmyra-x4-v1:0, us.writer.palmyra-x4-v1:0, writer.palmyra-x5-v1:0, us.writer.palmyra-x5-v1:0.

Verification sources: https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-writer-palmyra-x4.html, https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-writer-palmyra-x5.html, https://aws.amazon.com/bedrock/pricing/
Verified metadata applied:

• writer.palmyra-x4-v1:0: format=converse, flavor=chat, displayName=Palmyra X4, max_input_tokens=128000, max_output_tokens=8192, pricing(input/output per 1M)=2.5/10, providers=bedrock
• us.writer.palmyra-x4-v1:0: format=converse, flavor=chat, displayName=US Palmyra X4, parent=writer.palmyra-x4-v1:0, max_input_tokens=128000, max_output_tokens=8192, pricing(input/output per 1M)=2.5/10, providers=bedrock
• writer.palmyra-x5-v1:0: format=converse, flavor=chat, displayName=Palmyra X5, max_input_tokens=128000, max_output_tokens=8192, pricing(input/output per 1M)=0.6/6, providers=bedrock
• us.writer.palmyra-x5-v1:0: format=converse, flavor=chat, displayName=US Palmyra X5, parent=writer.palmyra-x5-v1:0, max_input_tokens=128000, max_output_tokens=8192, pricing(input/output per 1M)=0.6/6, providers=bedrock

Opened #633 to apply the catalog update.