client-signals for Python

Python implementation of the shared client-signals contract.

Installation

pip install client-signals

Import as client_signals.

Requires Python 3.9 or newer.

Usage

import client_signals

signals = client_signals.detect_once()
headers = {}

client_signals.apply_headers(headers, signals)
headers["User-Agent"] = f"my-cli/1.0 {client_signals.user_agent_suffix(signals)}"

Use a custom header prefix:

client_signals.apply_headers(headers, signals, prefix="Acme")

API

detect() computes fresh signals.
detect_once() computes and caches process-wide signals.
headers_for(signals, prefix="Fly") returns a header dictionary.
apply_headers(target, signals, prefix="Fly") updates a mutable header mapping.
user_agent_suffix(signals) returns the client-signals User-Agent token.
operator(signals) returns ci, agent, interactive, or unknown; precedence is in that order.
Signals is the dataclass returned by detection.
sanitize_invoked_by(value) and classify_parent_name(raw) are exposed for tests and advanced consumers that need the shared contract helpers.

Development

python3 -m unittest

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