By Your Side Python SDK

Zero-dependency Python client for the By Your Side Agent Outbound-Call API. Place objective-driven AI calls, poll for results, and verify webhooks using only the Python standard library.

Requires Python 3.8+. No third-party packages needed.

Quick start

Place a call and wait for the result

from byourside import Client

client = Client(api_key="bys_ak_YOUR_KEY")

# Place an outbound call with an objective
call = client.place_call(
    to="+14155550123",
    objective="Confirm the appointment for tomorrow at 2pm and ask if they need to reschedule.",
    fields=[
        {"name": "confirmed", "type": "boolean"},
        {"name": "new_time", "type": "string"},
    ],
)
print("Placed:", call["callId"], "status:", call["status"])

# Poll until the call reaches a terminal status (default timeout: 180s)
result = client.wait_for_call(call["callId"], timeout=180, interval=5)
print("Final status:", result["status"])
print("Extracted fields:", result.get("extracted"))

List recent calls

calls = client.list_calls(limit=10)
for c in calls:
    print(c["callId"], c["status"])

Get a specific call

call = client.get_call("call_abc123")
print(call)

Call statuses

wait_for_call returns once the status is one of the five terminal states.

Webhook verification

By Your Side sends a X-BYS-Signature header with each webhook delivery. Verify it before processing the payload.

Flask example

from flask import Flask, request, abort
from byourside import verify_webhook

app = Flask(__name__)
WEBHOOK_SECRET = "whsec_YOUR_SECRET"

@app.route("/webhook/bys", methods=["POST"])
def bys_webhook():
    sig = request.headers.get("X-BYS-Signature", "")
    raw_body = request.get_data(as_text=True)
    if not verify_webhook(sig, raw_body, WEBHOOK_SECRET):
        abort(400, "Invalid signature")
    payload = request.get_json()
    print("Call update:", payload["callId"], payload["status"])
    return "", 200

The signature format is t=<unix_seconds>,v1=<hex> where hex = HMAC-SHA256(secret, f"{t}.{raw_body}").

verify_webhook never raises. It returns False for invalid or expired signatures (default tolerance: 300 seconds).

Error handling

All API errors raise ByoursideError:

from byourside import Client, ByoursideError

client = Client(api_key="bys_ak_YOUR_KEY")
try:
    client.place_call(to="+19001234567", objective="Sell something")
except ByoursideError as e:
    print(e.code)    # e.g. "destination_blocked"
    print(e.status)  # HTTP status, or 0 for network/timeout errors
    print(str(e))    # Human-readable message

Common error codes:

Development

Clone the repo. No install step needed for local use: run tests from the sdks/python/ directory so that byourside/ is on the path automatically.

cd sdks/python
python3 -m unittest discover -s tests

Expected output: all tests pass (11 tests across errors, client, wait, and webhooks).

If your environment does not add CWD to the path automatically, use:

cd sdks/python
PYTHONPATH=. python3 -m unittest discover -s tests

Syntax check all source files:

python3 -m py_compile byourside/errors.py byourside/client.py byourside/webhooks.py byourside/__init__.py

Publishing to PyPI is deferred. Do not publish without explicit owner approval.