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`@langchain/protocol`\n\nTypeScript bindings for the LangChain agent streaming protocol.\n\nThis package publishes the generated TypeScript schema bindings from\n`protocol.cddl` so TypeScript applications can type protocol commands, events,\nresults, and content blocks consistently.\n\n## What this package includes\n\n- Generated TypeScript protocol bindings in `protocol.ts`\n- Types for top-level messages such as `Command`, `Message`, and protocol events\n- Types for protocol modules including run, subscription, agent, input, state,\n  and usage\n\n## What this package does not include\n\nThis package does not currently ship a runtime client, transport, or helper APIs.\nIt is intended for typing protocol payloads and generated bindings only.\n\n## Installation\n\n```bash\nnpm install @langchain/protocol\n```\n\n## Usage\n\nUse type-only imports when consuming the protocol schema:\n\n```ts\nimport type {\n  Command,\n  Message,\n  SubscribeParams,\n  MessagesEvent,\n} from \"@langchain/protocol\";\n```\n\nYou can then use the exported types to model protocol payloads in your own\ntransport or client implementation:\n\n```ts\nimport type { Command, SubscribeParams } from \"@langchain/protocol\";\n\nconst params: SubscribeParams = {\n  channels: [\"messages\", \"lifecycle\"],\n};\n\nconst subscribeCommand: Command = {\n  id: 1,\n  method: \"subscription.subscribe\",\n  params,\n};\n```\n\n## Source of truth\n\nThe canonical protocol definition lives at [`protocol.cddl`]([https://](https://github.com/langchain-ai/agent-protocol/blob/main/streaming/protocol.cddl)). The TypeScript\nbindings in this package are generated from that schema.","users":{}}