diff --git a/CLAUDE.md b/CLAUDE.md
index af30ad8..ad6f9cf 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -13,7 +13,7 @@ This monorepo implements a stateless workflow engine driven by a single-step CLI
 | **Role** | A named actor within a workflow. Each role has a system prompt and a JSON Schema `outputSchema`. |
 | **Moderator** | Status-based graph evaluator — determines the next role (or `$END`) with zero LLM cost. |
 | **Agent** | An external CLI command (`uwf-hermes`, etc.) spawned by `uwf thread step`. Produces frontmatter markdown output. |
-| **CAS** | Content-Addressed Storage via `@uncaged/json-cas` — all workflow definitions, thread nodes, and outputs are immutable CAS nodes. |
+| **CAS** | Content-Addressed Storage via `@ocas/core` — all workflow definitions, thread nodes, and outputs are immutable CAS nodes. |
 | **Registry** | `~/.uncaged/workflow/registry.yaml` — maps workflow names to current CAS hashes. |
 
 ### Monorepo Structure
@@ -35,7 +35,7 @@ workflow/
 
 - Dependency layers: `workflow-protocol` → `workflow-util` → `workflow-util-agent` → `workflow-agent-hermes` / `cli-workflow`
 - Packages use `workspace:^` protocol (resolves to `^x.y.z` on publish)
-- External CAS: `@uncaged/json-cas` (store API, hashing, schema validation) + `@uncaged/json-cas-fs` (filesystem backend)
+- External CAS: `@ocas/core` (store API, hashing, schema validation) + `@ocas/fs` (filesystem backend)
 
 ## Language & Paradigm
 
diff --git a/packages/cli-workflow/package.json b/packages/cli-workflow/package.json
index 311e630..c6d693c 100644
--- a/packages/cli-workflow/package.json
+++ b/packages/cli-workflow/package.json
@@ -11,8 +11,8 @@
     "uwf": "./dist/cli.js"
   },
   "dependencies": {
-    "@uncaged/json-cas": "^0.5.3",
-    "@uncaged/json-cas-fs": "^0.5.3",
+    "@ocas/core": "^0.1.1",
+    "@ocas/fs": "^0.1.1",
     "@uncaged/workflow-protocol": "workspace:^",
     "@uncaged/workflow-util": "workspace:^",
     "@uncaged/workflow-util-agent": "workspace:^",
diff --git a/packages/cli-workflow/src/__tests__/adapter-json-roundtrip.test.ts b/packages/cli-workflow/src/__tests__/adapter-json-roundtrip.test.ts
index 711ddb7..23538af 100644
--- a/packages/cli-workflow/src/__tests__/adapter-json-roundtrip.test.ts
+++ b/packages/cli-workflow/src/__tests__/adapter-json-roundtrip.test.ts
@@ -2,8 +2,8 @@ import { execFileSync } from "node:child_process";
 import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { putSchema } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { putSchema } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, StepNodePayload, ThreadId } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import { registerUwfSchemas } from "../schemas.js";
diff --git a/packages/cli-workflow/src/__tests__/current-role.test.ts b/packages/cli-workflow/src/__tests__/current-role.test.ts
index 3a4d9bd..25f206c 100644
--- a/packages/cli-workflow/src/__tests__/current-role.test.ts
+++ b/packages/cli-workflow/src/__tests__/current-role.test.ts
@@ -1,7 +1,7 @@
 import { mkdir, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { putSchema } from "@uncaged/json-cas";
+import { putSchema } from "@ocas/core";
 import type { CasRef, ThreadId } from "@uncaged/workflow-protocol";
 import { describe, expect, test } from "vitest";
 import { createMarker, deleteMarker } from "../background/index.js";
diff --git a/packages/cli-workflow/src/__tests__/step-read.test.ts b/packages/cli-workflow/src/__tests__/step-read.test.ts
index 2e9fae9..0212c2d 100644
--- a/packages/cli-workflow/src/__tests__/step-read.test.ts
+++ b/packages/cli-workflow/src/__tests__/step-read.test.ts
@@ -1,8 +1,8 @@
 import { mkdir, mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { bootstrap, putSchema } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { bootstrap, putSchema } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import { cmdStepRead } from "../commands/step.js";
@@ -40,7 +40,7 @@ const DETAIL_SCHEMA = {
     turnCount: { type: "integer" as const },
     turns: {
       type: "array" as const,
-      items: { type: "string" as const, format: "cas_ref" },
+      items: { type: "string" as const, format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/cli-workflow/src/__tests__/step-show-json.test.ts b/packages/cli-workflow/src/__tests__/step-show-json.test.ts
index 26eeaaf..168367f 100644
--- a/packages/cli-workflow/src/__tests__/step-show-json.test.ts
+++ b/packages/cli-workflow/src/__tests__/step-show-json.test.ts
@@ -1,8 +1,8 @@
 import { mkdir, mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { bootstrap, type Hash, type JSONSchema, putSchema } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { bootstrap, type Hash, type JSONSchema, putSchema } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, StepNodePayload } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import { cmdStepShow } from "../commands/step.js";
@@ -45,7 +45,7 @@ const DETAIL_SCHEMA: JSONSchema = {
   properties: {
     turns: {
       type: "array",
-      items: { type: "string", format: "cas_ref" },
+      items: { type: "string", format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/cli-workflow/src/__tests__/step-timing.test.ts b/packages/cli-workflow/src/__tests__/step-timing.test.ts
index 24ae758..bfc38b2 100644
--- a/packages/cli-workflow/src/__tests__/step-timing.test.ts
+++ b/packages/cli-workflow/src/__tests__/step-timing.test.ts
@@ -1,8 +1,8 @@
 import { mkdir, mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { bootstrap, putSchema } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { bootstrap, putSchema } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, ThreadId } from "@uncaged/workflow-protocol";
 import { STEP_NODE_SCHEMA } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
@@ -43,7 +43,7 @@ const DETAIL_SCHEMA = {
     turnCount: { type: "integer" as const },
     turns: {
       type: "array" as const,
-      items: { type: "string" as const, format: "cas_ref" },
+      items: { type: "string" as const, format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/cli-workflow/src/__tests__/thread-read-quota.test.ts b/packages/cli-workflow/src/__tests__/thread-read-quota.test.ts
index 17b8585..6387ac7 100644
--- a/packages/cli-workflow/src/__tests__/thread-read-quota.test.ts
+++ b/packages/cli-workflow/src/__tests__/thread-read-quota.test.ts
@@ -1,8 +1,8 @@
 import { mkdir, mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { bootstrap, putSchema } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { bootstrap, putSchema } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, ThreadId } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import { cmdThreadRead } from "../commands/thread.js";
@@ -41,7 +41,7 @@ const DETAIL_SCHEMA = {
     turnCount: { type: "integer" as const },
     turns: {
       type: "array" as const,
-      items: { type: "string" as const, format: "cas_ref" },
+      items: { type: "string" as const, format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/cli-workflow/src/__tests__/thread-read-xml-tags.test.ts b/packages/cli-workflow/src/__tests__/thread-read-xml-tags.test.ts
index f28f323..cfadb89 100644
--- a/packages/cli-workflow/src/__tests__/thread-read-xml-tags.test.ts
+++ b/packages/cli-workflow/src/__tests__/thread-read-xml-tags.test.ts
@@ -1,8 +1,8 @@
 import { mkdir, mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { bootstrap, putSchema } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { bootstrap, putSchema } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, ThreadId } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import { cmdThreadRead, THREAD_READ_DEFAULT_QUOTA } from "../commands/thread.js";
@@ -42,7 +42,7 @@ const DETAIL_SCHEMA = {
     turnCount: { type: "integer" as const },
     turns: {
       type: "array" as const,
-      items: { type: "string" as const, format: "cas_ref" },
+      items: { type: "string" as const, format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/cli-workflow/src/__tests__/thread.test.ts b/packages/cli-workflow/src/__tests__/thread.test.ts
index d93b34b..00b1a16 100644
--- a/packages/cli-workflow/src/__tests__/thread.test.ts
+++ b/packages/cli-workflow/src/__tests__/thread.test.ts
@@ -1,8 +1,8 @@
 import { mkdir, mkdtemp, rm } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { bootstrap, putSchema } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { bootstrap, putSchema } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, ThreadId } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import { cmdStepList, cmdStepShow } from "../commands/step.js";
@@ -47,7 +47,7 @@ const DETAIL_SCHEMA = {
     turnCount: { type: "integer" as const },
     turns: {
       type: "array" as const,
-      items: { type: "string" as const, format: "cas_ref" },
+      items: { type: "string" as const, format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/cli-workflow/src/__tests__/workflow-resolution.test.ts b/packages/cli-workflow/src/__tests__/workflow-resolution.test.ts
index 664c265..52aa71c 100644
--- a/packages/cli-workflow/src/__tests__/workflow-resolution.test.ts
+++ b/packages/cli-workflow/src/__tests__/workflow-resolution.test.ts
@@ -1,7 +1,7 @@
 import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, WorkflowPayload } from "@uncaged/workflow-protocol";
 import { afterEach, beforeEach, describe, expect, test } from "vitest";
 import { stringify } from "yaml";
diff --git a/packages/cli-workflow/src/commands/cas.ts b/packages/cli-workflow/src/commands/cas.ts
index 8f9dbeb..689e64a 100644
--- a/packages/cli-workflow/src/commands/cas.ts
+++ b/packages/cli-workflow/src/commands/cas.ts
@@ -1,9 +1,9 @@
 import { readFileSync } from "node:fs";
 import { join } from "node:path";
 
-import type { JSONSchema, Store } from "@uncaged/json-cas";
-import { bootstrap, getSchema, putSchema, refs, walk } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import type { JSONSchema, Store } from "@ocas/core";
+import { bootstrap, getSchema, putSchema, refs, walk } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 
 import { TEXT_SCHEMA } from "../schemas.js";
 
@@ -85,13 +85,17 @@ export type SchemaListEntry = {
 
 export async function cmdCasSchemaList(storageRoot: string): Promise<SchemaListEntry[]> {
   const store = openStore(storageRoot);
-  const metaHash = await bootstrap(store);
+  const aliases = await bootstrap(store);
+  const metaHash = aliases["@ocas/schema"];
+  if (metaHash === undefined) {
+    throw new Error("Meta-schema not found in bootstrap result");
+  }
   const entries: SchemaListEntry[] = [];
 
   // Include meta-schema itself
   entries.push({ hash: metaHash, title: "(meta-schema)" });
 
-  for (const hash of store.listByType(metaHash)) {
+  for (const { hash } of store.listByType(metaHash)) {
     if (hash === metaHash) continue;
     const node = store.get(hash);
     if (node !== null) {
diff --git a/packages/cli-workflow/src/commands/shared.ts b/packages/cli-workflow/src/commands/shared.ts
index b01139c..fbb3df9 100644
--- a/packages/cli-workflow/src/commands/shared.ts
+++ b/packages/cli-workflow/src/commands/shared.ts
@@ -1,5 +1,5 @@
-import type { Store as CasStore, JSONSchema } from "@uncaged/json-cas";
-import { getSchema } from "@uncaged/json-cas";
+import type { Store as CasStore, JSONSchema } from "@ocas/core";
+import { getSchema } from "@ocas/core";
 import type {
   CasRef,
   StartNodePayload,
@@ -88,7 +88,7 @@ function expandOutput(uwf: UwfStore, outputRef: CasRef): unknown {
 }
 
 /**
- * Recursively expand all cas_ref fields in a CAS node's payload,
+ * Recursively expand all ocas_ref fields in a CAS node's payload,
  * replacing hash strings with the referenced node's expanded payload.
  */
 function expandDeep(store: CasStore, hash: CasRef, visited?: Set<string>): unknown {
@@ -120,7 +120,7 @@ function expandAnyOfField(
 ): unknown {
   if (!Array.isArray(schema.anyOf)) return value;
   for (const sub of schema.anyOf as JSONSchema[]) {
-    if (sub.format === "cas_ref" && typeof value === "string") {
+    if (sub.format === "ocas_ref" && typeof value === "string") {
       return expandDeep(store, value as CasRef, visited);
     }
   }
@@ -163,7 +163,7 @@ function expandValue(
   value: unknown,
   visited: Set<string>,
 ): unknown {
-  if (schema.format === "cas_ref") return expandCasRefField(store, value, visited);
+  if (schema.format === "ocas_ref") return expandCasRefField(store, value, visited);
   if (Array.isArray(schema.anyOf)) return expandAnyOfField(store, schema, value, visited);
   if (schema.type === "array") return expandArrayField(store, schema, value, visited);
   return expandObjectField(store, schema, value, visited);
diff --git a/packages/cli-workflow/src/commands/step.ts b/packages/cli-workflow/src/commands/step.ts
index c0c1ec5..e304c79 100644
--- a/packages/cli-workflow/src/commands/step.ts
+++ b/packages/cli-workflow/src/commands/step.ts
@@ -1,4 +1,4 @@
-import type { BootstrapCapableStore } from "@uncaged/json-cas";
+import type { BootstrapCapableStore } from "@ocas/core";
 import type {
   CasRef,
   StartEntry,
diff --git a/packages/cli-workflow/src/commands/thread.ts b/packages/cli-workflow/src/commands/thread.ts
index dad5e31..f738322 100644
--- a/packages/cli-workflow/src/commands/thread.ts
+++ b/packages/cli-workflow/src/commands/thread.ts
@@ -1,7 +1,7 @@
 import { execFileSync, spawn } from "node:child_process";
 import { access, readFile } from "node:fs/promises";
 import { dirname, isAbsolute, resolve as resolvePath } from "node:path";
-import { validate } from "@uncaged/json-cas";
+import { validate } from "@ocas/core";
 import type {
   AgentAlias,
   AgentConfig,
diff --git a/packages/cli-workflow/src/commands/workflow.ts b/packages/cli-workflow/src/commands/workflow.ts
index 8dc2b05..d6ae05b 100644
--- a/packages/cli-workflow/src/commands/workflow.ts
+++ b/packages/cli-workflow/src/commands/workflow.ts
@@ -1,8 +1,8 @@
 import { readFile } from "node:fs/promises";
 import { dirname, resolve as resolvePath } from "node:path";
 
-import type { JSONSchema } from "@uncaged/json-cas";
-import { putSchema, validate } from "@uncaged/json-cas";
+import type { JSONSchema } from "@ocas/core";
+import { putSchema, validate } from "@ocas/core";
 import type { CasRef, RoleDefinition, Target, WorkflowPayload } from "@uncaged/workflow-protocol";
 import { parse } from "yaml";
 import { createIncludeTag } from "../include.js";
diff --git a/packages/cli-workflow/src/schemas.ts b/packages/cli-workflow/src/schemas.ts
index 530c2c0..ce126fb 100644
--- a/packages/cli-workflow/src/schemas.ts
+++ b/packages/cli-workflow/src/schemas.ts
@@ -1,5 +1,5 @@
-import type { Hash, Store } from "@uncaged/json-cas";
-import { putSchema } from "@uncaged/json-cas";
+import type { Hash, Store } from "@ocas/core";
+import { putSchema } from "@ocas/core";
 import { START_NODE_SCHEMA, STEP_NODE_SCHEMA, WORKFLOW_SCHEMA } from "@uncaged/workflow-protocol";
 
 export const TEXT_SCHEMA = { type: "string" as const };
diff --git a/packages/cli-workflow/src/store.ts b/packages/cli-workflow/src/store.ts
index f491f71..48cf232 100644
--- a/packages/cli-workflow/src/store.ts
+++ b/packages/cli-workflow/src/store.ts
@@ -3,8 +3,8 @@ import { access, appendFile, mkdir, readdir, readFile, writeFile } from "node:fs
 import { homedir } from "node:os";
 import { join } from "node:path";
 
-import type { BootstrapCapableStore, Hash } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import type { BootstrapCapableStore, Hash } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, ThreadId, ThreadListItem, ThreadsIndex } from "@uncaged/workflow-protocol";
 import { parse, stringify } from "yaml";
 
diff --git a/packages/workflow-agent-builtin/package.json b/packages/workflow-agent-builtin/package.json
index 33a9db5..507ad12 100644
--- a/packages/workflow-agent-builtin/package.json
+++ b/packages/workflow-agent-builtin/package.json
@@ -23,7 +23,7 @@
     "test:ci": "vitest run"
   },
   "dependencies": {
-    "@uncaged/json-cas": "^0.5.3",
+    "@ocas/core": "^0.1.1",
     "@uncaged/workflow-util-agent": "workspace:^",
     "@uncaged/workflow-util": "workspace:^"
   },
diff --git a/packages/workflow-agent-builtin/src/agent.ts b/packages/workflow-agent-builtin/src/agent.ts
index ee6cb85..40be050 100644
--- a/packages/workflow-agent-builtin/src/agent.ts
+++ b/packages/workflow-agent-builtin/src/agent.ts
@@ -1,4 +1,4 @@
-import type { Store } from "@uncaged/json-cas";
+import type { Store } from "@ocas/core";
 import { createLogger, generateUlid } from "@uncaged/workflow-util";
 import {
   type AgentContext,
diff --git a/packages/workflow-agent-builtin/src/detail.ts b/packages/workflow-agent-builtin/src/detail.ts
index 828fdcb..c1d887f 100644
--- a/packages/workflow-agent-builtin/src/detail.ts
+++ b/packages/workflow-agent-builtin/src/detail.ts
@@ -1,4 +1,4 @@
-import { bootstrap, putSchema, type Store } from "@uncaged/json-cas";
+import { bootstrap, putSchema, type Store } from "@ocas/core";
 
 import { BUILTIN_DETAIL_SCHEMA, BUILTIN_TURN_SCHEMA } from "./schemas.js";
 import { readSessionTurns } from "./session.js";
diff --git a/packages/workflow-agent-builtin/src/schemas.ts b/packages/workflow-agent-builtin/src/schemas.ts
index c9e8077..2505d40 100644
--- a/packages/workflow-agent-builtin/src/schemas.ts
+++ b/packages/workflow-agent-builtin/src/schemas.ts
@@ -1,4 +1,4 @@
-import type { JSONSchema } from "@uncaged/json-cas";
+import type { JSONSchema } from "@ocas/core";
 
 const BUILTIN_TOOL_CALL_SCHEMA: JSONSchema = {
   type: "object",
@@ -38,7 +38,7 @@ export const BUILTIN_DETAIL_SCHEMA: JSONSchema = {
     turnCount: { type: "integer" },
     turns: {
       type: "array",
-      items: { type: "string", format: "cas_ref" },
+      items: { type: "string", format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/workflow-agent-builtin/src/tools/types.ts b/packages/workflow-agent-builtin/src/tools/types.ts
index a96573b..b5de40e 100644
--- a/packages/workflow-agent-builtin/src/tools/types.ts
+++ b/packages/workflow-agent-builtin/src/tools/types.ts
@@ -1,4 +1,4 @@
-import type { JSONSchema } from "@uncaged/json-cas";
+import type { JSONSchema } from "@ocas/core";
 
 export type ToolContext = {
   cwd: string;
diff --git a/packages/workflow-agent-claude-code/__tests__/session-detail.test.ts b/packages/workflow-agent-claude-code/__tests__/session-detail.test.ts
index 03d1d2e..28c9bb0 100644
--- a/packages/workflow-agent-claude-code/__tests__/session-detail.test.ts
+++ b/packages/workflow-agent-claude-code/__tests__/session-detail.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test";
-import { createMemoryStore, walk } from "@uncaged/json-cas";
+import { createMemoryStore, walk } from "@ocas/core";
 import {
   parseClaudeCodeJsonOutput,
   parseClaudeCodeStreamOutput,
diff --git a/packages/workflow-agent-claude-code/package.json b/packages/workflow-agent-claude-code/package.json
index a585f78..8d3800a 100644
--- a/packages/workflow-agent-claude-code/package.json
+++ b/packages/workflow-agent-claude-code/package.json
@@ -23,7 +23,7 @@
     "test:ci": "vitest run"
   },
   "dependencies": {
-    "@uncaged/json-cas": "^0.5.3",
+    "@ocas/core": "^0.1.1",
     "@uncaged/workflow-util-agent": "workspace:^",
     "@uncaged/workflow-util": "workspace:^"
   },
diff --git a/packages/workflow-agent-claude-code/src/claude-code.ts b/packages/workflow-agent-claude-code/src/claude-code.ts
index 8996f46..bf22c22 100644
--- a/packages/workflow-agent-claude-code/src/claude-code.ts
+++ b/packages/workflow-agent-claude-code/src/claude-code.ts
@@ -1,5 +1,5 @@
 import { spawn } from "node:child_process";
-import type { Store } from "@uncaged/json-cas";
+import type { Store } from "@ocas/core";
 import { createLogger } from "@uncaged/workflow-util";
 import {
   type AgentContext,
diff --git a/packages/workflow-agent-claude-code/src/schemas.ts b/packages/workflow-agent-claude-code/src/schemas.ts
index 9626249..d6efb10 100644
--- a/packages/workflow-agent-claude-code/src/schemas.ts
+++ b/packages/workflow-agent-claude-code/src/schemas.ts
@@ -1,4 +1,4 @@
-import type { JSONSchema } from "@uncaged/json-cas";
+import type { JSONSchema } from "@ocas/core";
 
 export const CLAUDE_CODE_DETAIL_SCHEMA: JSONSchema = {
   title: "claude-code-detail",
@@ -34,7 +34,7 @@ export const CLAUDE_CODE_DETAIL_SCHEMA: JSONSchema = {
     },
     turns: {
       type: "array",
-      items: { type: "string", format: "cas_ref" },
+      items: { type: "string", format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/workflow-agent-claude-code/src/session-detail.ts b/packages/workflow-agent-claude-code/src/session-detail.ts
index 0b0ea36..0854ecc 100644
--- a/packages/workflow-agent-claude-code/src/session-detail.ts
+++ b/packages/workflow-agent-claude-code/src/session-detail.ts
@@ -1,4 +1,4 @@
-import { bootstrap, putSchema, type Store } from "@uncaged/json-cas";
+import { bootstrap, putSchema, type Store } from "@ocas/core";
 
 import {
   CLAUDE_CODE_DETAIL_SCHEMA,
diff --git a/packages/workflow-agent-hermes/__tests__/session-detail.test.ts b/packages/workflow-agent-hermes/__tests__/session-detail.test.ts
index 0e6e603..5f0a293 100644
--- a/packages/workflow-agent-hermes/__tests__/session-detail.test.ts
+++ b/packages/workflow-agent-hermes/__tests__/session-detail.test.ts
@@ -3,7 +3,7 @@ import { describe, expect, test } from "bun:test";
 import { mkdtemp, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { createMemoryStore, refs, validate, walk } from "@uncaged/json-cas";
+import { createMemoryStore, refs, validate, walk } from "@ocas/core";
 
 import {
   computeDurationMs,
@@ -82,7 +82,7 @@ describe("computeDurationMs", () => {
 });
 
 describe("storeHermesSessionDetail", () => {
-  test("stores hermes-detail root with cas_ref turns walkable", async () => {
+  test("stores hermes-detail root with ocas_ref turns walkable", async () => {
     const session: HermesSessionJson = {
       session_id: "20260518_133159_6a84e8",
       model: "claude-opus-4.6",
diff --git a/packages/workflow-agent-hermes/package.json b/packages/workflow-agent-hermes/package.json
index 5af99bf..1b70c7e 100644
--- a/packages/workflow-agent-hermes/package.json
+++ b/packages/workflow-agent-hermes/package.json
@@ -23,7 +23,7 @@
     "test:ci": "vitest run"
   },
   "dependencies": {
-    "@uncaged/json-cas": "^0.5.3",
+    "@ocas/core": "^0.1.1",
     "@uncaged/workflow-util-agent": "workspace:^",
     "@uncaged/workflow-protocol": "workspace:^",
     "@uncaged/workflow-util": "workspace:^"
diff --git a/packages/workflow-agent-hermes/src/hermes.ts b/packages/workflow-agent-hermes/src/hermes.ts
index 77427eb..2dc2328 100644
--- a/packages/workflow-agent-hermes/src/hermes.ts
+++ b/packages/workflow-agent-hermes/src/hermes.ts
@@ -1,4 +1,4 @@
-import type { Store } from "@uncaged/json-cas";
+import type { Store } from "@ocas/core";
 import { createLogger } from "@uncaged/workflow-util";
 import {
   type AgentContext,
diff --git a/packages/workflow-agent-hermes/src/schemas.ts b/packages/workflow-agent-hermes/src/schemas.ts
index 6d62183..41f0838 100644
--- a/packages/workflow-agent-hermes/src/schemas.ts
+++ b/packages/workflow-agent-hermes/src/schemas.ts
@@ -1,4 +1,4 @@
-import type { JSONSchema } from "@uncaged/json-cas";
+import type { JSONSchema } from "@ocas/core";
 
 const HERMES_TOOL_CALL_SCHEMA: JSONSchema = {
   type: "object",
@@ -39,7 +39,7 @@ export const HERMES_DETAIL_SCHEMA: JSONSchema = {
     turnCount: { type: "integer" },
     turns: {
       type: "array",
-      items: { type: "string", format: "cas_ref" },
+      items: { type: "string", format: "ocas_ref" },
     },
   },
   additionalProperties: false,
diff --git a/packages/workflow-agent-hermes/src/session-detail.ts b/packages/workflow-agent-hermes/src/session-detail.ts
index 87e9928..28b3ba0 100644
--- a/packages/workflow-agent-hermes/src/session-detail.ts
+++ b/packages/workflow-agent-hermes/src/session-detail.ts
@@ -3,7 +3,7 @@ import { readFile } from "node:fs/promises";
 import { homedir } from "node:os";
 import { join } from "node:path";
 
-import { bootstrap, putSchema, type Store } from "@uncaged/json-cas";
+import { bootstrap, putSchema, type Store } from "@ocas/core";
 
 import { HERMES_DETAIL_SCHEMA, HERMES_RAW_OUTPUT_SCHEMA, HERMES_TURN_SCHEMA } from "./schemas.js";
 import type {
diff --git a/packages/workflow-protocol/package.json b/packages/workflow-protocol/package.json
index 2b957d7..df703e0 100644
--- a/packages/workflow-protocol/package.json
+++ b/packages/workflow-protocol/package.json
@@ -20,8 +20,8 @@
     "test:ci": "vitest run"
   },
   "dependencies": {
-    "@uncaged/json-cas": "^0.5.3",
-    "@uncaged/json-cas-fs": "^0.5.3"
+    "@ocas/core": "^0.1.1",
+    "@ocas/fs": "^0.1.1"
   },
   "devDependencies": {
     "typescript": "^5.8.3"
diff --git a/packages/workflow-protocol/src/schemas.ts b/packages/workflow-protocol/src/schemas.ts
index 8144187..81d062b 100644
--- a/packages/workflow-protocol/src/schemas.ts
+++ b/packages/workflow-protocol/src/schemas.ts
@@ -1,4 +1,4 @@
-import type { JSONSchema } from "@uncaged/json-cas";
+import type { JSONSchema } from "@ocas/core";
 
 const ROLE_DEFINITION: JSONSchema = {
   type: "object",
@@ -9,7 +9,7 @@ const ROLE_DEFINITION: JSONSchema = {
     capabilities: { type: "array", items: { type: "string" } },
     procedure: { type: "string" },
     output: { type: "string" },
-    frontmatter: { type: "string", format: "cas_ref" },
+    frontmatter: { type: "string", format: "ocas_ref" },
   },
   additionalProperties: false,
 };
@@ -54,7 +54,7 @@ export const START_NODE_SCHEMA: JSONSchema = {
   type: "object",
   required: ["workflow", "prompt", "cwd"],
   properties: {
-    workflow: { type: "string", format: "cas_ref" },
+    workflow: { type: "string", format: "ocas_ref" },
     prompt: { type: "string" },
     cwd: { type: "string" },
   },
@@ -76,20 +76,20 @@ export const STEP_NODE_SCHEMA: JSONSchema = {
     "cwd",
   ],
   properties: {
-    start: { type: "string", format: "cas_ref" },
+    start: { type: "string", format: "ocas_ref" },
     prev: {
-      anyOf: [{ type: "string", format: "cas_ref" }, { type: "null" }],
+      anyOf: [{ type: "string", format: "ocas_ref" }, { type: "null" }],
     },
     role: { type: "string" },
-    output: { type: "string", format: "cas_ref" },
-    detail: { type: "string", format: "cas_ref" },
+    output: { type: "string", format: "ocas_ref" },
+    detail: { type: "string", format: "ocas_ref" },
     agent: { type: "string" },
     edgePrompt: { type: "string" },
     startedAtMs: { type: "integer" },
     completedAtMs: { type: "integer" },
     cwd: { type: "string" },
     assembledPrompt: {
-      anyOf: [{ type: "string", format: "cas_ref" }, { type: "null" }],
+      anyOf: [{ type: "string", format: "ocas_ref" }, { type: "null" }],
     },
   },
   additionalProperties: false,
diff --git a/packages/workflow-util-agent/__tests__/adapter-retry.test.ts b/packages/workflow-util-agent/__tests__/adapter-retry.test.ts
index aa9e1e7..079ac2b 100644
--- a/packages/workflow-util-agent/__tests__/adapter-retry.test.ts
+++ b/packages/workflow-util-agent/__tests__/adapter-retry.test.ts
@@ -1,4 +1,4 @@
-import { createMemoryStore, putSchema } from "@uncaged/json-cas";
+import { createMemoryStore, putSchema } from "@ocas/core";
 import { describe, expect, test } from "vitest";
 
 import { tryFrontmatterFastPath } from "../src/frontmatter.js";
diff --git a/packages/workflow-util-agent/__tests__/adapter-stdout.test.ts b/packages/workflow-util-agent/__tests__/adapter-stdout.test.ts
index a724c98..c150032 100644
--- a/packages/workflow-util-agent/__tests__/adapter-stdout.test.ts
+++ b/packages/workflow-util-agent/__tests__/adapter-stdout.test.ts
@@ -1,4 +1,4 @@
-import { createMemoryStore, putSchema } from "@uncaged/json-cas";
+import { createMemoryStore, putSchema } from "@ocas/core";
 import { describe, expect, test } from "vitest";
 
 import { tryFrontmatterFastPath } from "../src/frontmatter.js";
diff --git a/packages/workflow-util-agent/__tests__/frontmatter-fast-path.test.ts b/packages/workflow-util-agent/__tests__/frontmatter-fast-path.test.ts
index c42f1dc..f17d646 100644
--- a/packages/workflow-util-agent/__tests__/frontmatter-fast-path.test.ts
+++ b/packages/workflow-util-agent/__tests__/frontmatter-fast-path.test.ts
@@ -1,4 +1,4 @@
-import { createMemoryStore, putSchema } from "@uncaged/json-cas";
+import { createMemoryStore, putSchema } from "@ocas/core";
 import { describe, expect, test } from "vitest";
 
 import { tryFrontmatterFastPath } from "../src/frontmatter.js";
diff --git a/packages/workflow-util-agent/package.json b/packages/workflow-util-agent/package.json
index 4c8f29b..b041c53 100644
--- a/packages/workflow-util-agent/package.json
+++ b/packages/workflow-util-agent/package.json
@@ -20,8 +20,8 @@
     "test:ci": "vitest run"
   },
   "dependencies": {
-    "@uncaged/json-cas": "^0.5.3",
-    "@uncaged/json-cas-fs": "^0.5.3",
+    "@ocas/core": "^0.1.1",
+    "@ocas/fs": "^0.1.1",
     "@uncaged/workflow-protocol": "workspace:^",
     "@uncaged/workflow-util": "workspace:^",
     "dotenv": "^16.6.1",
diff --git a/packages/workflow-util-agent/src/build-output-format-instruction.ts b/packages/workflow-util-agent/src/build-output-format-instruction.ts
index 8db5c7b..2df7e73 100644
--- a/packages/workflow-util-agent/src/build-output-format-instruction.ts
+++ b/packages/workflow-util-agent/src/build-output-format-instruction.ts
@@ -1,4 +1,4 @@
-import type { JSONSchema } from "@uncaged/json-cas";
+import type { JSONSchema } from "@ocas/core";
 
 type SchemaProperty = {
   name: string;
diff --git a/packages/workflow-util-agent/src/context.ts b/packages/workflow-util-agent/src/context.ts
index 3631760..462665a 100644
--- a/packages/workflow-util-agent/src/context.ts
+++ b/packages/workflow-util-agent/src/context.ts
@@ -1,4 +1,4 @@
-import type { Store } from "@uncaged/json-cas";
+import type { Store } from "@ocas/core";
 import type {
   CasRef,
   StartNodePayload,
diff --git a/packages/workflow-util-agent/src/extract.ts b/packages/workflow-util-agent/src/extract.ts
index 64807d2..0a4258d 100644
--- a/packages/workflow-util-agent/src/extract.ts
+++ b/packages/workflow-util-agent/src/extract.ts
@@ -1,4 +1,4 @@
-import { getSchema, validate } from "@uncaged/json-cas";
+import { getSchema, validate } from "@ocas/core";
 
 import type { CasRef, ModelAlias, WorkflowConfig } from "@uncaged/workflow-protocol";
 import { createAgentStore, resolveStorageRoot } from "./storage.js";
diff --git a/packages/workflow-util-agent/src/frontmatter.ts b/packages/workflow-util-agent/src/frontmatter.ts
index 5000b33..4574137 100644
--- a/packages/workflow-util-agent/src/frontmatter.ts
+++ b/packages/workflow-util-agent/src/frontmatter.ts
@@ -1,5 +1,5 @@
-import type { Store } from "@uncaged/json-cas";
-import { getSchema, validate } from "@uncaged/json-cas";
+import type { Store } from "@ocas/core";
+import { getSchema, validate } from "@ocas/core";
 import type { CasRef } from "@uncaged/workflow-protocol";
 import {
   type AgentFrontmatter,
diff --git a/packages/workflow-util-agent/src/run.ts b/packages/workflow-util-agent/src/run.ts
index e2ccee7..28d5936 100644
--- a/packages/workflow-util-agent/src/run.ts
+++ b/packages/workflow-util-agent/src/run.ts
@@ -1,4 +1,4 @@
-import { getSchema, validate } from "@uncaged/json-cas";
+import { getSchema, validate } from "@ocas/core";
 import type { CasRef, StepNodePayload, ThreadId } from "@uncaged/workflow-protocol";
 import { config as loadDotenv } from "dotenv";
 import { buildOutputFormatInstruction } from "./build-output-format-instruction.js";
diff --git a/packages/workflow-util-agent/src/schemas.ts b/packages/workflow-util-agent/src/schemas.ts
index 77c5f54..8a36956 100644
--- a/packages/workflow-util-agent/src/schemas.ts
+++ b/packages/workflow-util-agent/src/schemas.ts
@@ -1,5 +1,5 @@
-import type { Hash, Store } from "@uncaged/json-cas";
-import { putSchema } from "@uncaged/json-cas";
+import type { Hash, Store } from "@ocas/core";
+import { putSchema } from "@ocas/core";
 import { START_NODE_SCHEMA, STEP_NODE_SCHEMA, WORKFLOW_SCHEMA } from "@uncaged/workflow-protocol";
 
 export type UwfAgentSchemaHashes = {
diff --git a/packages/workflow-util-agent/src/storage.ts b/packages/workflow-util-agent/src/storage.ts
index 7d94a40..573d632 100644
--- a/packages/workflow-util-agent/src/storage.ts
+++ b/packages/workflow-util-agent/src/storage.ts
@@ -2,8 +2,8 @@ import { readFile } from "node:fs/promises";
 import { homedir } from "node:os";
 import { join } from "node:path";
 
-import type { Store } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import type { Store } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type {
   AgentAlias,
   AgentConfig,
diff --git a/packages/workflow-util-agent/src/types.ts b/packages/workflow-util-agent/src/types.ts
index bdd43c2..6cd54d6 100644
--- a/packages/workflow-util-agent/src/types.ts
+++ b/packages/workflow-util-agent/src/types.ts
@@ -1,4 +1,4 @@
-import type { Store } from "@uncaged/json-cas";
+import type { Store } from "@ocas/core";
 import type { ModeratorContext, ThreadId, WorkflowPayload } from "@uncaged/workflow-protocol";
 
 export type AgentContext = ModeratorContext & {
diff --git a/packages/workflow-util/src/developer-reference.ts b/packages/workflow-util/src/developer-reference.ts
index f8447c5..0fca04f 100644
--- a/packages/workflow-util/src/developer-reference.ts
+++ b/packages/workflow-util/src/developer-reference.ts
@@ -20,7 +20,7 @@ Dependency layers (each only imports from packages above it):
 protocol → util → util-agent → agent-hermes / agent-builtin / cli-workflow
 \`\`\`
 
-External CAS: \`@uncaged/json-cas\` (store API, hashing, schema validation) + \`@uncaged/json-cas-fs\` (filesystem backend).
+External CAS: \`@ocas/core\` (store API, hashing, schema validation) + \`@ocas/fs\` (filesystem backend).
 
 ## Coding Conventions
 
@@ -122,7 +122,7 @@ Shared entry point for all agent CLIs. Handles:
 
 ### CAS Integration
 
-All data is CAS-addressed via \`@uncaged/json-cas\`:
+All data is CAS-addressed via \`@ocas/core\`:
 - \`store.put(schemaHash, data)\` → content hash
 - \`store.get(hash)\` → node
 - \`validate(store, node)\` → schema check
diff --git a/scripts/mock-agent.ts b/scripts/mock-agent.ts
index bc4cb32..e66fdc0 100644
--- a/scripts/mock-agent.ts
+++ b/scripts/mock-agent.ts
@@ -1,6 +1,6 @@
 #!/usr/bin/env bun
 // Mock agent for smoke testing
-import { bootstrap, type JSONSchema, putSchema } from "@uncaged/json-cas";
+import { bootstrap, type JSONSchema, putSchema } from "@ocas/core";
 import { createAgent } from "../packages/uwf-agent-kit/src/index.js";
 
 const MOCK_RAW_OUTPUT_SCHEMA: JSONSchema = {