nexus-claude-api

Local Anthropic-compatible API proxy for using AI Nexus Claude models with Claude Code.

AI Nexus currently documents AWS Bedrock Converse API as the workaround while Anthropic Messages API support is unavailable. This service exposes local Anthropic-compatible endpoints and translates them to Nexus Converse requests.

Quick Start

cd nexus-claude-api
uv sync --extra dev
uv run nexus-claude-api config set --api-key "your-nexus-api-key"
uv run nexus-claude-api start --port 4141 --claude-code

Use the printed Claude Code command in the same shell.

ANTHROPIC_AUTH_TOKEN='dummy' in the printed command is only a local Claude Code compatibility placeholder. Claude Code expects an Anthropic auth token variable to exist, but this local proxy does not validate it by default. It is not your Nexus key.

The printed command ends with claude --model <configured-model> so the current Claude Code process uses this proxy's configured model instead of any model saved in your global Claude settings. The helper does not edit C:\Users\A200477427\.claude\settings.json or any other global Claude Code configuration.

Endpoints

• GET /
• HEAD /
• GET /health
• GET /v1/models
• POST /v1/messages
• POST /v1/messages/count_tokens

Environment

Credential lookup order:

1. --api-key
2. user config ~/.config/nexus-claude-api/config.json
3. NEXUS_API_KEY
4. AWS_BEARER_TOKEN_BEDROCK

To write user config:

nexus-claude-api config set --api-key "your-nexus-api-key"

This creates ~/.config/nexus-claude-api/config.json:

{
  "api_key": "your-nexus-api-key"
}

Logs are written to ~/.config/nexus-claude-api/logs/nexus-claude-api.log by default.

For repository-local development only, pass --dev and create nexus-claude-api.local.json in the current directory:

uv run nexus-claude-api start --dev --port 4141 --claude-code

In development mode, config is read from nexus-claude-api.local.json and logs are written to logs/nexus-claude-api.log in the current directory. The local config file is ignored by git.

The service binds to 127.0.0.1 by default and does not persist API keys.

Docs

• PRD
• Requirements Design
• AI Nexus Claude Documentation
• Python Internal Distribution Guide