diff --git a/TASKS.md b/TASKS.md
index 1cb82c4..a568c09 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -145,5 +145,6 @@ Progress:
   - Phase 0 / task `0.1`: создан `crank-core::ext` module skeleton
   - Phase 0 / task `0.2`: `MachineCredentialVerifier` и связанные типы вынесены из `apps/mcp-server` в public seam `crank_core::ext::auth`
   - Phase 0 / task `0.5`: введены `PolicyEngine`, `SessionActor`, `PolicyAction`, `PolicyScope`, `PolicyDecision` и default `OwnerOnlyPolicyEngine` в public seam `crank_core::ext::access`
+  - Phase 0 / task `0.6`: введены `AuditSink`, `NoopAuditSink`, `AuditEventId` и базовые audit-типы в public seam `crank_core::ext::audit`
   - Phase 0 / task `0.7`: введены `CapabilityProfile` и `CommunityCapabilityProfile`, а `admin-api` capability payload теперь собирается через public seam вместо локального literal
   - backward-compatible alias `CommunityMachineCredentialVerifier` сохранен, поведение Community не изменено
diff --git a/crates/crank-core/src/ext/audit.rs b/crates/crank-core/src/ext/audit.rs
index 8b13789..93984cb 100644
--- a/crates/crank-core/src/ext/audit.rs
+++ b/crates/crank-core/src/ext/audit.rs
@@ -1 +1,94 @@
+use std::sync::Arc;
 
+use async_trait::async_trait;
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use time::OffsetDateTime;
+
+use crate::{AuditEventId, UserId, UserSessionId, WorkspaceId};
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct AuditActor {
+    pub user_id: UserId,
+    pub email: String,
+    pub session_id: Option<UserSessionId>,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum AuditTargetKind {
+    Workspace,
+    Membership,
+    Invitation,
+    Operation,
+    Agent,
+    PlatformApiKey,
+    Secret,
+    AuthProfile,
+    Other,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct AuditTarget {
+    pub workspace_id: WorkspaceId,
+    pub kind: AuditTargetKind,
+    pub id: String,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct AuditEvent {
+    pub id: AuditEventId,
+    #[serde(with = "time::serde::rfc3339")]
+    pub occurred_at: OffsetDateTime,
+    pub actor: AuditActor,
+    pub action: String,
+    pub target: AuditTarget,
+    pub payload: Value,
+    pub source_ip: Option<String>,
+    pub user_agent: Option<String>,
+}
+
+#[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+pub struct AuditQuery {
+    pub workspace_id: Option<WorkspaceId>,
+    pub action: Option<String>,
+    pub cursor: Option<String>,
+    pub limit: Option<u32>,
+}
+
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+pub struct AuditEventPage {
+    pub items: Vec<AuditEvent>,
+    pub next_cursor: Option<String>,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum AuditError {
+    #[error("audit sink failed: {0}")]
+    Backend(String),
+}
+
+#[async_trait]
+pub trait AuditSink: Send + Sync {
+    async fn record(&self, event: AuditEvent) -> Result<(), AuditError>;
+
+    async fn list(&self, _query: AuditQuery) -> Result<AuditEventPage, AuditError> {
+        Ok(AuditEventPage::default())
+    }
+
+    async fn get(&self, _id: &AuditEventId) -> Result<Option<AuditEvent>, AuditError> {
+        Ok(None)
+    }
+}
+
+pub type SharedAuditSink = Arc<dyn AuditSink>;
+
+#[derive(Clone, Copy, Debug, Default)]
+pub struct NoopAuditSink;
+
+#[async_trait]
+impl AuditSink for NoopAuditSink {
+    async fn record(&self, _event: AuditEvent) -> Result<(), AuditError> {
+        Ok(())
+    }
+}
diff --git a/crates/crank-core/src/ids.rs b/crates/crank-core/src/ids.rs
index 99b5e8e..6942a56 100644
--- a/crates/crank-core/src/ids.rs
+++ b/crates/crank-core/src/ids.rs
@@ -54,6 +54,7 @@ define_id!(AgentId);
 define_id!(InvitationId);
 define_id!(PlatformApiKeyId);
 define_id!(InvocationLogId);
+define_id!(AuditEventId);
 define_id!(SecretId);
 define_id!(StreamSessionId);
 define_id!(AsyncJobId);
diff --git a/crates/crank-core/src/lib.rs b/crates/crank-core/src/lib.rs
index a38af30..0ceba0a 100644
--- a/crates/crank-core/src/lib.rs
+++ b/crates/crank-core/src/lib.rs
@@ -35,15 +35,19 @@ pub use edition::{
 pub use ext::access::{
     OwnerOnlyPolicyEngine, PolicyAction, PolicyDecision, PolicyEngine, PolicyScope, SessionActor,
 };
+pub use ext::audit::{
+    AuditActor, AuditError, AuditEvent, AuditEventPage, AuditQuery, AuditSink, AuditTarget,
+    AuditTargetKind, NoopAuditSink, SharedAuditSink,
+};
 pub use ext::auth::{
     MachineCredentialVerifier, MachineCredentialVerifierError, SharedMachineCredentialVerifier,
     VerifiedMachineCredential,
 };
 pub use ext::capability::{CapabilityProfile, CommunityCapabilityProfile};
 pub use ids::{
-    AgentId, AsyncJobId, AuthProfileId, DescriptorId, InvitationId, InvocationLogId, OperationId,
-    PlatformApiKeyId, SampleId, SecretId, StreamSessionId, ToolId, UserId, UserSessionId,
-    WorkspaceId,
+    AgentId, AsyncJobId, AuditEventId, AuthProfileId, DescriptorId, InvitationId, InvocationLogId,
+    OperationId, PlatformApiKeyId, SampleId, SecretId, StreamSessionId, ToolId, UserId,
+    UserSessionId, WorkspaceId,
 };
 pub use observability::{
     InvocationLevel, InvocationLog, InvocationSource, InvocationStatus, UsagePeriod, UsageRollup,