Providers

The review pass runs against one LLM provider, resolved from flags and the environment. Flags always win over env. Nothing here is persisted — see Credentials.

Choosing a provider

--provider accepts anthropic, openai, or auto (the default).

With auto, miu-cr picks OpenAI when OPENAI_API_KEY is set (or --provider openai is passed) and no Anthropic credential is present; otherwise it picks Anthropic. An Anthropic credential means any of --api-key, --auth-token, ANTHROPIC_API_KEY, ANTHROPIC_AUTH_TOKEN, or ZAI_API_KEY. Anthropic is the default because it backs both the native API and Anthropic-compatible gateways.

Anthropic

export ANTHROPIC_API_KEY=...
miucr review --staged

Resolution order (first non-empty wins):

Setting	Flag	Env	Default
API key	--api-key	ANTHROPIC_API_KEY	— (required unless an auth token is set)
Auth token	--auth-token	ANTHROPIC_AUTH_TOKEN	—
Base URL	--base-url	ANTHROPIC_BASE_URL	SDK default
Model	--model	ANTHROPIC_MODEL	claude-sonnet-4-5-20250929

The API key is sent as the x-api-key header. When you supply an auth token instead, it is sent as a Bearer Authorization header — this is what Anthropic-compatible gateways like z.ai expect.

GLM via z.ai (Anthropic-compatible)

z.ai exposes an Anthropic-compatible gateway, so miu-cr drives GLM through the Anthropic path with a base URL + bearer token. Two equivalent ways:

Explicit base URL + auth token:

export ANTHROPIC_BASE_URL=https://api.z.ai/api/anthropic
export ANTHROPIC_AUTH_TOKEN=$ZAI_API_KEY
miucr review --staged --model glm-4.6

Shorthand with ZAI_API_KEY:

export ZAI_API_KEY=...
miucr review --staged --model glm-4.6

With ZAI_API_KEY set and no other Anthropic credential, miu-cr uses it as the bearer auth token and defaults the base URL to https://api.z.ai/api/anthropic. Either form also works as flags:

miucr review --staged \
  --base-url https://api.z.ai/api/anthropic \
  --auth-token "$ZAI_API_KEY" \
  --model glm-4.6

Tip

Set --model (or ANTHROPIC_MODEL) to a GLM model — the pinned default is an Anthropic model and will not exist on the z.ai gateway.

OpenAI (and OpenAI-compatible)

export OPENAI_API_KEY=...
miucr review --staged --provider openai

Resolution order:

Setting	Flag	Env	Default
API key	--api-key	OPENAI_API_KEY	— (required)
Base URL	--base-url	OPENAI_BASE_URL	https://api.openai.com/v1
Model	--model	OPENAI_MODEL	gpt-4o

Point --base-url / OPENAI_BASE_URL at any OpenAI-compatible endpoint to use a different gateway.

Missing credentials

If no credential is found for the resolved provider, the review fails with a typed error (exit 1) and a hint, e.g.:

no Anthropic credentials: set ANTHROPIC_API_KEY (or ANTHROPIC_AUTH_TOKEN / ZAI_API_KEY) or pass --api-key / --auth-token