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feat: add azure_anthropic backend #101

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@timothyjlaurent timothyjlaurent commented Feb 12, 2026 •
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Summary

  • Add azure_anthropic backend for running Anthropic models (Claude) hosted on Azure AI Foundry
  • New AzureAnthropicClient that passes base_url derived from resource name to the Anthropic SDK
  • Register backend in get_client() router and ClientBackend type

Environment Variables

Follows the ANTHROPIC_FOUNDRY_* convention used by Claude Code:

Variable Purpose
ANTHROPIC_FOUNDRY_API_KEY API key
ANTHROPIC_FOUNDRY_RESOURCE Azure resource name (derives https://{resource}.services.ai.azure.com)
ANTHROPIC_FOUNDRY_BASE_URL Explicit base URL (overrides resource)

Usage

export ANTHROPIC_FOUNDRY_API_KEY="your-key"
export ANTHROPIC_FOUNDRY_RESOURCE="ml-platform-openai-stg-useast-2"

rlm ask . -q "Summarize this repo" --backend azure_anthropic --model claude-opus-4-6

Test plan

  • 24 unit tests passing (URL resolution, init, env vars, message prep, completion, async, routing)
  • End-to-end test with a live Azure Foundry endpoint

Closes #100

🤖 Generated with Claude Code

@timothyjlaurent timothyjlaurent mentioned this pull request Feb 12, 2026
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@timothyjlaurent timothyjlaurent force-pushed the feat/azure-anthropic-backend branch from f78a4d9 to 123a752 Compare February 12, 2026 01:01
@timothyjlaurent @claude
feat: add azure_anthropic backend for Anthropic models on Azure AI Fo…
0fac7ca 
…undry

Add an `azure_anthropic` backend that routes Anthropic API calls through
Azure AI Foundry endpoints. Follows the ANTHROPIC_FOUNDRY_* env var
convention used by Claude Code:

  ANTHROPIC_FOUNDRY_API_KEY      - API key
  ANTHROPIC_FOUNDRY_RESOURCE     - Azure resource name (derives base URL)
  ANTHROPIC_FOUNDRY_BASE_URL     - Explicit endpoint (resource- or project-scoped)

The /anthropic/v1 path suffix is appended automatically. Both resource-level
and project-scoped Foundry endpoints are supported.

Includes 27 unit tests covering URL resolution, initialization, env var
fallback, message preparation, sync/async completion, usage tracking,
and get_client router integration.

Closes alexzhang13#100

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@timothyjlaurent timothyjlaurent force-pushed the feat/azure-anthropic-backend branch from 65161b6 to 0fac7ca Compare February 12, 2026 01:19
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Add azure_anthropic backend for Anthropic models on Azure AI Foundry

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