axio-transport-anthropic 0.9.0

Anthropic Claude transport for Axio

axio-transport-anthropic

Anthropic Claude transport for axio.

Streams Claude responses over the Anthropic Messages API using aiohttp and SSE parsing. Supports prompt caching, extended thinking, and automatic retry on rate-limit and overload errors.

Features

• All Claude models - Opus, Sonnet, Haiku; configurable via ANTHROPIC_MODELS
• Prompt caching - cache_control: ephemeral applied automatically to the system prompt and the last tool definition
• Extended thinking - ReasoningDelta events emitted for thinking blocks
• Retry logic - automatic backoff on 429 and all 5xx errors; honours Retry-After header
• TUI integration - settings screen for API key and model selection

Installation

pip install axio-transport-anthropic

With the TUI settings screen:

pip install "axio-transport-anthropic[tui]"

Or as part of the full TUI bundle:

pip install "axio-tui[anthropic]"

Usage

import aiohttp
from axio.agent import Agent
from axio.context import MemoryContextStore
from axio_transport_anthropic import AnthropicTransport, ANTHROPIC_MODELS

async def main() -> None:
    async with aiohttp.ClientSession() as session:
        transport = AnthropicTransport(
            api_key="sk-ant-...",
            model=ANTHROPIC_MODELS["claude-sonnet-4-6"],
            session=session,
        )
        agent = Agent(system="You are helpful.", tools=[], transport=transport)
        ctx = MemoryContextStore()
        print(await agent.run("Hello!", ctx))

Set the API key via environment variable instead of passing it directly:

export ANTHROPIC_API_KEY="sk-ant-..."

Override the base URL (e.g. for a proxy or private endpoint):

export ANTHROPIC_BASE_URL="https://your-proxy.example.com/v1"

Models

Model ID	Context	Max output	Notes
claude-opus-4-6	1 M	128 k	Most capable
claude-sonnet-4-6	1 M	64 k	Balanced (default)
claude-haiku-4-5-20251001	200 k	64 k	Fastest / cheapest
claude-opus-4-5	200 k	64 k	-
claude-sonnet-4-5	200 k	64 k	-

Configuration

Parameter	Default	Description
api_key	""	Anthropic API key
model	claude-sonnet-4-6	Active model
base_url	https://api.anthropic.com/v1	API base URL
max_retries	10	Max retry attempts on 429 and 5xx errors
retry_base_delay	5.0	Base delay (seconds) for exponential backoff

fetch_models()

await transport.fetch_models() resets transport.models to the built-in ANTHROPIC_MODELS registry. It does not make a network request. Override model directly to switch the active model.

Serialisation

AnthropicTransport supports JSON round-trip for storing and restoring configuration:

# Serialise
data = transport.to_dict()   # -> {"name": ..., "base_url": ..., "api_key": ..., "models": [...]}

# Restore
transport = AnthropicTransport.from_dict(data, session=session)

from_dict falls back to ANTHROPIC_API_KEY and ANTHROPIC_BASE_URL environment variables if the stored values are empty.

Part of the axio ecosystem

axio · axio-tui · axio-transport-openai · axio-transport-codex

License

MIT