MACP Policy Registry

Governance Policies define deterministic, replay-safe governance rules that are evaluated at commitment time within MACP Sessions.

Identifier Format

Policy identifiers use the form:

policy.{namespace}.{name}

Example:

policy.fraud.majority-veto

Reserved Policies

The policy.default identifier is reserved and MUST NOT be registered or unregistered. It is pre-registered in every conformant runtime.

The whole policy.std. namespace is reserved. A runtime MAY pre-register any subset of the profiles above, including none of them — reservation is a collision guarantee, not a provisioning requirement. A runtime that does provide one MUST use the canonical rules in RFC-MACP-0012 §5.2 verbatim, and a SessionStart naming a policy.std. identifier the runtime does not provide is rejected with UNKNOWN_POLICY_VERSION. Identifiers under policy.std. not listed above are reserved but unassigned.

Short unnamespaced identifiers such as policy.majority are not reserved and remain available to deployments. Deployments SHOULD still use their own namespace (policy.{org}.{name}) so that later additions under policy.std. cannot collide with local rules.

Registration

Policies are registered with the runtime via:

• gRPC RegisterPolicy RPC — dynamic registration at runtime
• File loading from MACP_POLICIES_DIR — static loading at startup (implementation-defined)

Both paths are admission: the rule-schema validation required by RFC-MACP-0012 §7 runs when a descriptor is registered or loaded, against the rule schemas the runtime ships — and never again afterwards. Because rule schemas can tighten between releases, a policy file that loaded under an earlier release may fail to load under a later one. Such a failure bars new sessions from binding that policy; it MUST NOT affect stored sessions, which replay from the persisted PolicyDescriptor without revalidation (RFC-MACP-0012 §8, items 2 and 4), never from MACP_POLICIES_DIR.

Rule Schemas

Each standard mode defines a normative JSON Schema for its governance rules: