Prosader Python SDK

Guard AI agent tool calls with a Prosader runtime security gateway. Every guarded call is evaluated against your policy and produces a signed, tamper-evident audit receipt — evidence you can hand to an auditor and verify independently with prosader-verify.

No dependencies: the SDK uses only the Python standard library (3.9+).

Install

pip install prosader

Usage

import prosader

client = prosader.Client(
    gateway_url="https://gateway.example.com:8443",
    api_key="psk-live-...",
    agent_id="billing-agent",
)

# Option 1 — explicit check before you execute a tool:
decision = client.check("bash", parameters={"command": "rm -rf /tmp/cache"})
if decision.allowed:
    run_command(...)
else:
    print(f"blocked by rule {decision.rule_id}: {decision.reason}")
    # decision.receipt_id — signed audit receipt either way

# Option 2 — wrap a function; blocked calls raise prosader.Denied:
@client.wrap("send_email")
def send_email(to, subject, body):
    ...

try:
    send_email(to="cfo@example.com", subject="Invoice", body="...")
except prosader.Denied as e:
    print(e.decision.reason)

Or configure once and use module-level helpers:

prosader.configure(gateway_url="https://...", api_key="psk-...", agent_id="my-agent")

@prosader.wrap("bash")
def run_bash(command): ...

Configuration falls back to environment variables: PROSADER_GATEWAY_URL, PROSADER_API_KEY, PROSADER_AGENT_ID.

Outcomes

Errors:

• prosader.Denied — raised by wrapped functions when blocked.
• prosader.BillingError — subscription inactive or decision quota exhausted (HTTP 402).
• prosader.GatewayError — gateway unreachable. Prosader is fail-closed: treat this as a denial.

Notes

• Function arguments of wrapped functions are sent as the tool call's parameters so policy rules can match on them (e.g. deny bash where command contains rm -rf).
• For development gateways with a self-signed certificate, pass verify_tls=False. Never do this in production.
• Requires a gateway new enough to support check-only mode (X-Prosader-Check-Only), July 2026 or later.

Running tests

python -m unittest discover -s tests -v