zu-providers 0.4.0

Zu model-provider adapters: scripted, anthropic, openai-compatible

zu-providers

Model adapters — the ModelProvider port (the any-model seam). An adapter turns the harness's one normalized ModelRequest into a ModelResponse (text + tool calls + usage + finish reason) and declares its Capabilities. The core never special-cases a provider; it reads capabilities and proceeds.

Credentials are resolved from the environment inside the adapter — never placed in the model's context or in a config file.

Registered plugins (zu.providers)

Name	Class	Notes
scripted	ScriptedProvider	The fake model: replays fixed moves in order. Deterministic; the basis of every offline test. No key, no network.
anthropic	AnthropicProvider	The Anthropic Messages API. Needs [anthropic] SDK extra + an API key.
openai-compatible	OpenAICompatibleProvider	Any OpenAI-compatible endpoint (OpenAI, OpenRouter, Ollama, vLLM) via a base URL. Needs [openai] SDK extra.

_messages.py holds the shared request/response translation both real adapters build on, so they behave identically against the neutral contract.

Extend

Implement the ModelProvider shape, register it under zu.providers in pyproject.toml, and add a deterministic test (the contract test asserts every adapter behaves identically on the neutral surface).

Tests

uv run pytest packages/zu-providers — offline. Live-API smoke tests are opt-in behind ZU_LIVE_* env flags.