themis-policy
Python reference implementation of Themis RFC v0 — a policy kernel for
LLM agents that act on production systems. Four primitives — locks,
drafts, scopes, audit — composed by one engine into a single
decision per attempted action: allow, deny, redirect, or
require_approval.
Byte-compatible with themis-policy
(TypeScript): both pass the same conformance vectors.
from themis import (
PolicyEngine, DefaultLockPolicy, DefaultScopePolicy, DefaultDraftPolicy,
Requestor, Action, PolicyContext, ConsoleSink, is_deny,
)
engine = PolicyEngine(audit_sink=ConsoleSink())
engine.add_policy(DefaultLockPolicy())
engine.add_policy(DefaultScopePolicy())
engine.add_policy(DefaultDraftPolicy())
decision = engine.evaluate(PolicyContext(
requestor=Requestor(id="key_1", kind="api_key", tenant_id=7, scopes=("pages:read",)),
action=Action(verb="pages.update", resource_type="page", tenant_id=7, resource_id=42,
required_scope="pages:write"),
now=0, correlation_id="req-123",
))
if is_deny(decision):
print(decision.reason) # missing_scope
The engine is synchronous (every core policy is pure CPU); evaluate_async
exists for callers already inside an event loop. Stores (LockStore,
DraftStore) are ports you implement against your persistence; audit sinks
receive one event per evaluation and may never fail an evaluation.
Install: pip install themis-policy (Python 3.11+, no dependencies).
Tests: pip install -e '.[test]' && pytest.
Apache-2.0 — see the repository LICENSE.
1 maintainer
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