langchain-ai/docs
1
0
Fork 0
mirror of https://github.com/langchain-ai/docs.git synced 2026-07-23 04:45:23 -04:00
Code Issues 490 Packages Projects Releases Wiki Activity

[GH-ISSUE #1269] [langsmith]: JS/TS z.custom<BaseMessage[]>().register(registry, MessagesZodMeta) does not render interactive Messages in LangSmith Studio #186

New Issue
Open
opened 2026-02-17 17:19:21 -05:00 by yindo · 0 comments
yindo commented 2026-02-17 17:19:21 -05:00
Owner
Copy Link
Copy Source

Originally created by @d0lwl0b on GitHub (Nov 4, 2025).
Original GitHub issue: https://github.com/langchain-ai/docs/issues/1269

Type of issue

issue / bug

Language

JavaScript

Description

Describe the bug

When using the recommended MessagesZodMeta integration for state schemas, the messages field does not render as interactive chat messages in LangSmith Studio. Instead, the field only shows a raw array [], and the “View Rendered” panel does not activate the interactive message UI.

Environment

{
  "langchain": "^1.0.2",
  "@langchain/core": "^1.0.2",
  "@langchain/community": "^1.0.0",
  "@langchain/deepseek": "^1.0.0",
  "@langchain/openai": "^1.0.0",

  "@langchain/langgraph": "^1.0.1",
  "@langchain/langgraph-checkpoint-postgres": "^1.0.0",
  "@langchain/langgraph-cli": "^1.0.3",
  "@langchain/langgraph-sdk": "^1.0.0"
}

Code Snippet

// state.ts
import { z } from "zod";
import type { BaseMessage } from "@langchain/core/messages";
import { MessagesZodMeta } from "@langchain/langgraph";
import { registry } from "@langchain/langgraph/zod";

export const State = z.object({
  messages: z.custom<BaseMessage[]>().register(registry, MessagesZodMeta),
  // ...
});

Actual Behavior

  • In LangSmith Studio:

    • The messages field only displays as [] raw JSON.
    • The interactive chat viewer is not activated.

Expected Behavior

  • The messages field should render using the built-in interactive message UI (similar to how LangChain message traces render in Studio).

Additional Context

This appears to be a discrepancy specifically in LangSmith Studio UI rendering, because runtime behavior inside the graph is correct.

Originally created by @d0lwl0b on GitHub (Nov 4, 2025). Original GitHub issue: https://github.com/langchain-ai/docs/issues/1269 ### Type of issue issue / bug ### Language JavaScript ### Description **Describe the bug** When using the recommended `MessagesZodMeta` integration for state schemas, the `messages` field does not render as interactive chat messages in **LangSmith Studio**. Instead, the field only shows a raw array `[]`, and the “View Rendered” panel does not activate the interactive message UI. --- **Environment** ```json { "langchain": "^1.0.2", "@langchain/core": "^1.0.2", "@langchain/community": "^1.0.0", "@langchain/deepseek": "^1.0.0", "@langchain/openai": "^1.0.0", "@langchain/langgraph": "^1.0.1", "@langchain/langgraph-checkpoint-postgres": "^1.0.0", "@langchain/langgraph-cli": "^1.0.3", "@langchain/langgraph-sdk": "^1.0.0" } ``` --- **Code Snippet** ```ts // state.ts import { z } from "zod"; import type { BaseMessage } from "@langchain/core/messages"; import { MessagesZodMeta } from "@langchain/langgraph"; import { registry } from "@langchain/langgraph/zod"; export const State = z.object({ messages: z.custom<BaseMessage[]>().register(registry, MessagesZodMeta), // ... }); ``` --- **Actual Behavior** * In LangSmith Studio: * The `messages` field only displays as `[]` raw JSON. * The **interactive chat viewer** is not activated. **Expected Behavior** * The `messages` field should render using the built-in **interactive message UI** (similar to how LangChain message traces render in Studio). --- **Additional Context** This appears to be a discrepancy specifically in **LangSmith Studio UI rendering**, because runtime behavior inside the graph is correct.
yindo added the langsmithexternal labels 2026-02-17 17:19:21 -05:00
yindo changed title from [langsmith]: JS/TS `z.custom<BaseMessage[]>().register(registry, MessagesZodMeta)` does not render interactive Messages in LangSmith Studio to [GH-ISSUE #1269] [langsmith]: JS/TS `z.custom<BaseMessage[]>().register(registry, MessagesZodMeta)` does not render interactive Messages in LangSmith Studio 2026-06-05 17:25:31 -04:00
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
bug
deepagents
docs-infra
external
external
help wanted
integration
internal
internal
javascript
js/ts
langchain
langgraph
langsmith
needs-title
pull-request
Mirrored from GitHub Pull Request
 python
reference
No Label external langsmith
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
yindo
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: langchain-ai/docs#186
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?