Per-Request Provider Filtering — only, ignore, ZDR

2026-03-23

What We Built

Per-request provider filtering via provider field in the completions request body:

• provider.only: ["anthropic"] — only use listed providers
• provider.ignore: ["deepseek"] — exclude listed providers
• provider.zdr: true — zero data retention mode (Anthropic, Azure only)
• Mutual exclusion validation, unknown provider detection with suggestions
• ZDR response header: X-BR-ZDR: true

Lockstep Checklist

• [x] API: Provider filter parsing + validation
• [x] SDK-TS: ProviderFilter type exported
• [x] Tests: 13 tests for validation, filtering, ZDR, provider lists
• [x] Docs: Ship log