diff --git a/README.md b/README.md
index 4e4877a5..821ff9e7 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,7 @@ and pretending the label makes it furniture.
 | Procedural geometry state | `GameCult.Geometry` | CultCache-native domain trees, LOD build requests, selected-cut diagnostics, and chunk artifact payloads | Rust, Unity, or remote workers need to share CSG/LOD geometry and graph metadata as typed state | Transport policy, peer discovery, or gameplay authority |
 | Network transport and database plumbing | `GameCult.Networking` / CultNet | LiteNetLib transport, authentication, schema-v0 wire contracts, shard authority, raw document replication, snapshots, and subscriptions | You need a client/server pipe, login/session flow, schema discovery, or a low-level distributed CultCache lane | Gameplay-facing mesh ergonomics, Verse policy, mod branches, or simulation consensus composition |
 | Distributed realtime gameplay state | `GameCult.Mesh` / CultMesh | Public mesh entrypoints, Verse discovery, peer exchange, shard replication defaults, authority leases, client prediction, and witness consensus | You want the game to treat clients and servers as one reactive database for persistent state, input state, and simulation facts | A tiny local-only tool, a bare transport client, or a storage format contract |
+| Realtime media/frame streams | CultMesh streaming mode | Stream identity, authority, clock metadata, body transport negotiation, frame cursors, and backpressure state | Audio/video/tensor frames need to move between runtimes through shared memory, GPU handles, platform buffers, or CultCache page refs | Durable document mutation, mesh consensus facts, or pretending inline bytes are zero-copy |
 
 Quick rule:
 
@@ -32,6 +33,8 @@ Quick rule:
   schema-aware database messages?"
 - Choose CultMesh when the problem is "how does a game join a Verse and share
   realtime state across a mesh?"
+- Choose CultMesh streaming mode when the problem is "how do these runtimes move
+  audio/video frames while the mesh owns identity, clocks, cursors, and pressure?"
 
 CultMesh sits on CultNet, and CultNet distributes CultCache documents. That is
 the stack. If a design needs another peer-to-peer category, first check whether
diff --git a/packages/cultmesh-ts/README.md b/packages/cultmesh-ts/README.md
new file mode 100644
index 00000000..cf635466
--- /dev/null
+++ b/packages/cultmesh-ts/README.md
@@ -0,0 +1,75 @@
+# CultMesh TS
+
+`cultmesh-ts` is the TypeScript surface for local CultMesh nodes: typed
+CultCache documents, peer catalogs, authority leases, and realtime stream
+contracts for runtimes that need to share media without turning the mesh into a
+base64 soup kitchen.
+
+## Streaming Mode
+
+CultMesh streaming mode is for audio, video, tensor, and opaque byte frames that
+need to move between diverse runtimes with as few copies as the platform allows.
+It is not document replication with a bigger packet.
+
+The split is deliberate:
+
+- CultMesh owns stream identity, authority, clock metadata, negotiated body
+  transport, frame cursors, and health/backpressure state.
+- The body lane owns frame bytes or native handles: shared memory, D3D11/D3D12
+  textures, DMA-BUF, IOSurface, AHardwareBuffer, CultCache page refs, or inline
+  bytes as a last resort.
+- Producers report `unavoidableCopyCount`; zero-copy is a target and a measured
+  property, not a vibe in a lab coat.
+
+The first public API is `CultMeshStreamCatalog`:
+
+```ts
+import { CultMesh } from "cultmesh-ts";
+
+const streams = CultMesh.createStreamCatalog();
+
+streams.declare({
+  streamId: "mimir:kiyo-pro",
+  verseId: "studio",
+  ownerPeerId: "starfire",
+  kind: "video",
+  clock: { clockDomainId: "starfire-qpc" },
+  video: {
+    width: 1920,
+    height: 1080,
+    pixelFormat: "YUY2",
+    framesPerSecond: 30,
+  },
+  preferredTransports: [
+    "shared-d3d12-texture",
+    "shared-memory",
+    "cultcache-page",
+  ],
+});
+
+const lane = streams.negotiate("mimir:kiyo-pro", {
+  peerId: "fensalir",
+  verseId: "studio",
+  supportedTransports: ["shared-d3d12-texture", "cultcache-page"],
+  acceptedKinds: ["video"],
+  canImportGpuHandles: true,
+});
+
+streams.publishFrame({
+  streamId: lane.streamId,
+  sequence: 42n,
+  timestampNs: 1_000_000_000n,
+  durationNs: 33_333_334n,
+  transport: lane.transport,
+  nativeHandle: "0xfeed",
+  fenceHandle: "0xbeef",
+  fenceValue: 7n,
+  unavoidableCopyCount: 0,
+});
+```
+
+Current implementation status: this package owns the typed stream declaration,
+negotiation, and latest-frame cursor surface. Runtime-specific transports still
+need platform adapters: named shared memory on local processes, D3D/Metal/Vulkan
+handle import for GPU frames, and CultCache page append/readback for durable
+recording or nonlocal fallbacks.
diff --git a/packages/cultmesh-ts/src/index.ts b/packages/cultmesh-ts/src/index.ts
index 9f2cd1f0..f07b6bd9 100644
--- a/packages/cultmesh-ts/src/index.ts
+++ b/packages/cultmesh-ts/src/index.ts
@@ -166,6 +166,190 @@ export class CultMeshAuthorityLeaseCatalog {
   }
 }
 
+export type CultMeshStreamKind = "audio" | "video" | "tensor" | "bytes";
+
+export type CultMeshStreamBodyTransport =
+  | "shared-memory"
+  | "shared-d3d12-texture"
+  | "shared-d3d11-texture"
+  | "dma-buf"
+  | "iosurface"
+  | "ahardwarebuffer"
+  | "cultcache-page"
+  | "inline-bytes";
+
+export type CultMeshStreamAccess = "read" | "write" | "read-write";
+
+export interface CultMeshStreamClock {
+  clockDomainId: string;
+  sourceId?: string;
+  sampleRate?: number;
+  offsetToVerseTimeNs?: number;
+  confidence?: number;
+  evidenceKind?: string;
+}
+
+export interface CultMeshAudioStreamFormat {
+  sampleRate: number;
+  channels: number;
+  sampleFormat: "float32" | "int16" | "int24" | "int32";
+  framesPerPacket?: number;
+}
+
+export interface CultMeshVideoStreamFormat {
+  width: number;
+  height: number;
+  pixelFormat: string;
+  framesPerSecond?: number;
+  planeCount?: number;
+}
+
+export interface CultMeshStreamDescriptor {
+  streamId: string;
+  verseId: string;
+  ownerPeerId: string;
+  kind: CultMeshStreamKind;
+  label?: string;
+  clock: CultMeshStreamClock;
+  audio?: CultMeshAudioStreamFormat;
+  video?: CultMeshVideoStreamFormat;
+  preferredTransports: readonly CultMeshStreamBodyTransport[];
+  requiredAccess?: CultMeshStreamAccess;
+  maxInFlightFrames?: number;
+  metadataSchemaId?: string;
+}
+
+export interface CultMeshStreamConsumerProfile {
+  peerId: string;
+  verseId: string;
+  supportedTransports: readonly CultMeshStreamBodyTransport[];
+  acceptedKinds?: readonly CultMeshStreamKind[];
+  canImportGpuHandles?: boolean;
+  canMapSharedMemory?: boolean;
+  maxInFlightFrames?: number;
+}
+
+export interface CultMeshStreamNegotiation {
+  streamId: string;
+  producerPeerId: string;
+  consumerPeerId: string;
+  transport: CultMeshStreamBodyTransport;
+  access: CultMeshStreamAccess;
+  maxInFlightFrames: number;
+  copyBudget: "zero-copy-target" | "one-copy-fallback" | "opaque-runtime";
+}
+
+export interface CultMeshStreamFrameHandle {
+  streamId: string;
+  sequence: bigint;
+  timestampNs: bigint;
+  durationNs?: bigint;
+  transport: CultMeshStreamBodyTransport;
+  byteLength?: number;
+  nativeHandle?: string;
+  resourceKey?: string;
+  pageRef?: string;
+  fenceHandle?: string;
+  fenceValue?: bigint;
+  unavoidableCopyCount?: number;
+  metadata?: Record<string, unknown>;
+}
+
+export class CultMeshStreamCatalog {
+  readonly #streams = new Map<string, CultMeshStreamDescriptor>();
+  readonly #latestFrames = new Map<string, CultMeshStreamFrameHandle>();
+
+  public get streams(): readonly CultMeshStreamDescriptor[] {
+    return [...this.#streams.values()].sort((left, right) =>
+      left.streamId.localeCompare(right.streamId),
+    );
+  }
+
+  public declare(stream: CultMeshStreamDescriptor): CultMeshStreamDescriptor {
+    requireNonEmpty(stream.streamId, "stream.streamId");
+    requireNonEmpty(stream.verseId, "stream.verseId");
+    requireNonEmpty(stream.ownerPeerId, "stream.ownerPeerId");
+    requireNonEmpty(stream.clock.clockDomainId, "stream.clock.clockDomainId");
+    if (stream.preferredTransports.length === 0) {
+      throw new Error("stream.preferredTransports must not be empty.");
+    }
+
+    this.#streams.set(stream.streamId, stream);
+    return stream;
+  }
+
+  public get(streamId: string): CultMeshStreamDescriptor | undefined {
+    requireNonEmpty(streamId, "streamId");
+    return this.#streams.get(streamId);
+  }
+
+  public find(
+    verseId: string,
+    kind?: CultMeshStreamKind,
+  ): readonly CultMeshStreamDescriptor[] {
+    requireNonEmpty(verseId, "verseId");
+    return this.streams.filter(
+      (stream) => stream.verseId === verseId && (!kind || stream.kind === kind),
+    );
+  }
+
+  public negotiate(
+    streamId: string,
+    consumer: CultMeshStreamConsumerProfile,
+  ): CultMeshStreamNegotiation {
+    const stream = this.get(streamId);
+    if (!stream) {
+      throw new Error(`Unknown CultMesh stream '${streamId}'.`);
+    }
+
+    if (consumer.verseId !== stream.verseId) {
+      throw new Error("stream and consumer must belong to the same Verse.");
+    }
+
+    if (
+      consumer.acceptedKinds &&
+      !consumer.acceptedKinds.includes(stream.kind)
+    ) {
+      throw new Error(`consumer does not accept ${stream.kind} streams.`);
+    }
+
+    const transport = stream.preferredTransports.find((candidate) =>
+      consumer.supportedTransports.includes(candidate),
+    );
+    if (!transport) {
+      throw new Error("stream and consumer have no compatible body transport.");
+    }
+
+    return {
+      streamId: stream.streamId,
+      producerPeerId: stream.ownerPeerId,
+      consumerPeerId: consumer.peerId,
+      transport,
+      access: stream.requiredAccess ?? "read",
+      maxInFlightFrames: Math.min(
+        stream.maxInFlightFrames ?? Number.MAX_SAFE_INTEGER,
+        consumer.maxInFlightFrames ?? Number.MAX_SAFE_INTEGER,
+      ),
+      copyBudget: copyBudgetFor(transport),
+    };
+  }
+
+  public publishFrame(frame: CultMeshStreamFrameHandle): CultMeshStreamFrameHandle {
+    requireNonEmpty(frame.streamId, "frame.streamId");
+    if (!this.#streams.has(frame.streamId)) {
+      throw new Error(`Unknown CultMesh stream '${frame.streamId}'.`);
+    }
+
+    this.#latestFrames.set(frame.streamId, frame);
+    return frame;
+  }
+
+  public latestFrame(streamId: string): CultMeshStreamFrameHandle | undefined {
+    requireNonEmpty(streamId, "streamId");
+    return this.#latestFrames.get(streamId);
+  }
+}
+
 export class CultMesh {
   public static async createNode(
     cachePath: string,
@@ -209,6 +393,10 @@ export class CultMesh {
   public static createAuthorityLeaseCatalog(): CultMeshAuthorityLeaseCatalog {
     return new CultMeshAuthorityLeaseCatalog();
   }
+
+  public static createStreamCatalog(): CultMeshStreamCatalog {
+    return new CultMeshStreamCatalog();
+  }
 }
 
 function requireNonEmpty(value: string, name: string): void {
@@ -216,3 +404,21 @@ function requireNonEmpty(value: string, name: string): void {
     throw new Error(`${name} must be non-empty.`);
   }
 }
+
+function copyBudgetFor(
+  transport: CultMeshStreamBodyTransport,
+): CultMeshStreamNegotiation["copyBudget"] {
+  switch (transport) {
+    case "shared-memory":
+    case "shared-d3d12-texture":
+    case "shared-d3d11-texture":
+    case "dma-buf":
+    case "iosurface":
+    case "ahardwarebuffer":
+      return "zero-copy-target";
+    case "cultcache-page":
+      return "one-copy-fallback";
+    case "inline-bytes":
+      return "opaque-runtime";
+  }
+}
diff --git a/packages/cultmesh-ts/test/cultmesh.test.ts b/packages/cultmesh-ts/test/cultmesh.test.ts
index a74a504d..a6978ac7 100644
--- a/packages/cultmesh-ts/test/cultmesh.test.ts
+++ b/packages/cultmesh-ts/test/cultmesh.test.ts
@@ -67,3 +67,64 @@ test("CultMesh TS local authority leases do not trust peer cards by contact alon
 
   assert.equal(leases.isAuthorized(peer, "shard-primary"), true);
 });
+
+test("CultMesh TS negotiates streaming frame body transports explicitly", () => {
+  const streams = CultMesh.createStreamCatalog();
+  streams.declare({
+    streamId: "mimir:kiyo-pro",
+    verseId: "studio",
+    ownerPeerId: "starfire",
+    kind: "video",
+    label: "Kiyo Pro",
+    clock: {
+      clockDomainId: "starfire-qpc",
+      confidence: 0.25,
+      evidenceKind: "provisional-clock-domain-edge-fit",
+    },
+    video: {
+      width: 1920,
+      height: 1080,
+      pixelFormat: "YUY2",
+      framesPerSecond: 30,
+    },
+    preferredTransports: [
+      "shared-d3d12-texture",
+      "shared-memory",
+      "cultcache-page",
+    ],
+    maxInFlightFrames: 3,
+  });
+
+  const negotiation = streams.negotiate("mimir:kiyo-pro", {
+    peerId: "fensalir",
+    verseId: "studio",
+    supportedTransports: ["shared-d3d12-texture", "cultcache-page"],
+    acceptedKinds: ["video"],
+    canImportGpuHandles: true,
+    maxInFlightFrames: 2,
+  });
+
+  assert.deepEqual(negotiation, {
+    streamId: "mimir:kiyo-pro",
+    producerPeerId: "starfire",
+    consumerPeerId: "fensalir",
+    transport: "shared-d3d12-texture",
+    access: "read",
+    maxInFlightFrames: 2,
+    copyBudget: "zero-copy-target",
+  });
+
+  streams.publishFrame({
+    streamId: "mimir:kiyo-pro",
+    sequence: 42n,
+    timestampNs: 1_000_000_000n,
+    durationNs: 33_333_334n,
+    transport: "shared-d3d12-texture",
+    nativeHandle: "0xfeed",
+    fenceHandle: "0xbeef",
+    fenceValue: 7n,
+    unavoidableCopyCount: 0,
+  });
+
+  assert.equal(streams.latestFrame("mimir:kiyo-pro")?.sequence, 42n);
+});