diff --git a/backend/src/workspaces/runtime-config-lease.ts b/backend/src/workspaces/runtime-config-lease.ts
index 01352c02..e8cc4a77 100644
--- a/backend/src/workspaces/runtime-config-lease.ts
+++ b/backend/src/workspaces/runtime-config-lease.ts
@@ -240,7 +240,7 @@ function readSnapshotWorkspace(snapshotPath: string): {
   }
 }
 
-function runtimePaths(dataRoot: string, workspaceId: string): RuntimePaths {
+function runtimePaths(dataRoot: string, workspaceId: string, workspaceRevision?: string): RuntimePaths {
   if (!isAbsolute(dataRoot)) throw new Error("registry workspace runtime requires an absolute data root");
   const root = join(dataRoot, "sessions", workspaceId);
   return {
@@ -248,6 +248,9 @@ function runtimePaths(dataRoot: string, workspaceId: string): RuntimePaths {
     artifacts: join(root, "artifacts"),
     indexes: join(root, "indexes"),
     memory: join(root, "memory"),
+    ...(workspaceRevision === undefined
+      ? {}
+      : { annotations_root: join(dataRoot, "sessions", workspaceId, "revisions", workspaceRevision, "artifacts") }),
   };
 }
 
@@ -308,7 +311,7 @@ function renderWorkspaceRuntimeFromWorkspace(options: {
     workspaceId: options.workspaceId,
     workspaceRevision: options.workspaceRevision,
     revisionContentRoot: options.revisionContentRoot,
-    runtimePaths: runtimePaths(options.dataRoot, options.workspaceId),
+    runtimePaths: runtimePaths(options.dataRoot, options.workspaceId, options.workspaceRevision),
     installationOverlay: overlay,
     bindings,
     bindingDigest: stableBindingDigest(bindings),
@@ -316,7 +319,7 @@ function renderWorkspaceRuntimeFromWorkspace(options: {
     renderedConfig: renderRuntimeConfig(
       options.workspace,
       bindings,
-      runtimePaths(options.dataRoot, options.workspaceId),
+      runtimePaths(options.dataRoot, options.workspaceId, options.workspaceRevision),
       context,
       overlay,
       options.semanticRuntime,
diff --git a/backend/src/workspaces/runtime-renderer.ts b/backend/src/workspaces/runtime-renderer.ts
index a982e698..23db59a1 100644
--- a/backend/src/workspaces/runtime-renderer.ts
+++ b/backend/src/workspaces/runtime-renderer.ts
@@ -10,6 +10,8 @@ export interface RuntimePaths {
   artifacts: string;
   indexes: string;
   memory: string;
+  /** Revision-qualified root for curated FK annotations (P5); optional for legacy callers. */
+  annotations_root?: string;
 }
 
 export interface RuntimeIdentity {
diff --git a/backend/test/workspace-runtime-config-lease.test.ts b/backend/test/workspace-runtime-config-lease.test.ts
index 1512797e..f7bae6af 100644
--- a/backend/test/workspace-runtime-config-lease.test.ts
+++ b/backend/test/workspace-runtime-config-lease.test.ts
@@ -170,6 +170,27 @@ test("active workspace rendering is byte-identical to direct snapshot rendering"
   expect(active.catalogBlob).toMatch(/^sha256:[0-9a-f]{64}$/);
 });
 
+test("renders a revision-qualified annotations root for the active revision", async () => {
+  const f = await fixture();
+  const active = await renderActiveWorkspaceRuntime({
+    workspaceId: "psd-clinical",
+    registry: f.registry,
+    registryConfig: f.registryConfig,
+    harnessDir: f.harnessDir,
+    configPath: "config/tht.yaml",
+    dataRoot: f.dataRoot,
+    secretRoots: f.registryConfig.secretRoots,
+    semanticRuntime,
+  });
+  const rendered = parse(active.renderedConfig) as Record<string, any>;
+
+  expect(rendered.paths.annotations_root).toBe(
+    join(f.dataRoot, "sessions", "psd-clinical", "revisions", f.revision.commit, "artifacts"),
+  );
+  expect(rendered.roots.annotations_root).toBe(rendered.paths.annotations_root);
+  expect(rendered.paths.artifacts).toBe(join(f.dataRoot, "sessions", "psd-clinical", "artifacts"));
+});
+
 test("deterministic operator leases are keyed by logical identity and stable across calls", async () => {
   const f = await fixture();
   const first = await publishDeterministicRuntimeConfigLease({
diff --git a/harness/tests/test_annotations_root.py b/harness/tests/test_annotations_root.py
new file mode 100644
index 00000000..06f6bf6e
--- /dev/null
+++ b/harness/tests/test_annotations_root.py
@@ -0,0 +1,62 @@
+from pathlib import Path
+
+from tht.cli.schema_cmd import annotations_path
+from tht.config import load_config
+
+REVISION = "a" * 40
+
+
+def _config(tmp_path: Path, *, with_annotations_root: bool = True) -> Path:
+    annotations = tmp_path / "revisions" / REVISION / "artifacts"
+    roots = f"""
+roots:
+  sessions: {tmp_path / 'sessions'}
+  artifacts: {tmp_path / 'artifacts'}
+  indexes: {tmp_path / 'indexes'}
+  memory: {tmp_path / 'memory'}
+"""
+    if with_annotations_root:
+        roots += f"  annotations_root: {annotations}\n"
+    path = tmp_path / "runtime.yaml"
+    path.write_text(f"""
+runtime_identity:
+  workspace_id: demo
+  workspace_revision: {REVISION}
+  source_identity: workspace://demo
+dwh:
+  type: postgres_direct
+  connection: {{database: warehouse, schema: analytics, user: reader, password: secret}}
+{roots}
+""")
+    return path
+
+
+def test_annotations_path_prefers_revision_root(tmp_path, monkeypatch):
+    monkeypatch.delenv("THT_HOME", raising=False)
+    monkeypatch.delenv("THT_DATA_ROOT", raising=False)
+    cfg = load_config(_config(tmp_path))
+
+    assert cfg.paths.annotations_root == tmp_path / "revisions" / REVISION / "artifacts"
+    assert annotations_path(cfg) == (
+        tmp_path / "revisions" / REVISION / "artifacts" / "mschema" / "annotations.yaml"
+    )
+
+
+def test_annotations_path_falls_back_to_legacy_root(tmp_path, monkeypatch):
+    monkeypatch.delenv("THT_HOME", raising=False)
+    monkeypatch.delenv("THT_DATA_ROOT", raising=False)
+    cfg = load_config(_config(tmp_path, with_annotations_root=False))
+
+    assert cfg.paths.annotations_root is None
+    assert annotations_path(cfg) == tmp_path / "artifacts" / "mschema" / "annotations.yaml"
+
+
+def test_load_config_preserves_annotations_root_with_data_root(tmp_path, monkeypatch):
+    monkeypatch.setenv("THT_DATA_ROOT", str(tmp_path / "data"))
+    monkeypatch.delenv("THT_HOME", raising=False)
+    cfg = load_config(_config(tmp_path))
+
+    assert cfg.paths.annotations_root == tmp_path / "revisions" / REVISION / "artifacts"
+    assert annotations_path(cfg) == (
+        tmp_path / "revisions" / REVISION / "artifacts" / "mschema" / "annotations.yaml"
+    )
diff --git a/harness/tht/cli/schema_cmd.py b/harness/tht/cli/schema_cmd.py
index 742ae146..3adda3aa 100644
--- a/harness/tht/cli/schema_cmd.py
+++ b/harness/tht/cli/schema_cmd.py
@@ -49,6 +49,8 @@ def physical_path(cfg) -> Path:
 
 
 def annotations_path(cfg) -> Path:
+    if cfg.paths.annotations_root is not None:
+        return cfg.paths.annotations_root / "mschema" / "annotations.yaml"
     return cfg.paths.artifacts / "mschema" / "annotations.yaml"
 
 
diff --git a/harness/tht/config.py b/harness/tht/config.py
index 3418a529..4899078d 100644
--- a/harness/tht/config.py
+++ b/harness/tht/config.py
@@ -324,6 +324,9 @@ class PathsConfig(BaseModel):
     # Explicit workspace-global memory root (P3). When absent, legacy `artifacts/memory` is used
     # only through the documented migration path.
     memory: Path | None = None
+    # Revision-qualified curated FK annotations root (P5). When absent, legacy
+    # `artifacts/mschema/annotations.yaml` remains the annotations source.
+    annotations_root: Path | None = None
 
 
 class RuntimeIdentityConfig(BaseModel):
@@ -669,6 +672,8 @@ def load_config(path: Path) -> Config:
                     sessions=resolved.sessions,
                     artifacts=resolved.artifacts,
                     indexes=resolved.indexes,
+                    memory=cfg.paths.memory,
+                    annotations_root=cfg.paths.annotations_root,
                 )
             }
         )