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fix(oss/js/migrate): incorrect usage about context and dynamicSystemPromptMiddleware #1044

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fix(oss/js/migrate): incorrect usage about context and dynamicSystemPromptMiddleware #1044

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0d365d1
fix(oss/js): incorrect usage in migrate docs about context and dynami…
electroluxcode Oct 21, 2025
0aa54e6
Merge branch 'main' into main
electroluxcode Oct 23, 2025
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12 changes: 7 additions & 5 deletions src/oss/javascript/migrate/langchain-v1.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -111,11 +111,11 @@ import { createAgent, dynamicSystemPromptMiddleware } from "langchain";
import * as z from "zod";

const contextSchema = z.object({
userRole: z.enum(["expert", "beginner"]).default("user"),
userRole: z.enum(["expert", "beginner"]),
});

const userRolePrompt = dynamicSystemPromptMiddleware((request) => { // [!code highlight]
const userRole = request.runtime.context.userRole;
const userRolePrompt = dynamicSystemPromptMiddleware((state, runtime) => { // [!code highlight]
const userRole = runtime.context.userRole;
const basePrompt = "You are a helpful assistant.";

if (userRole === "expert") {
Expand All @@ -135,6 +135,7 @@ const agent = createAgent({

await agent.invoke({
messages: [new HumanMessage("Explain async programming")],
},{
context: {
userRole: "expert",
},
Expand All @@ -145,7 +146,7 @@ await agent.invoke({
import { createReactAgent } from "@langchain/langgraph/prebuilts";

const contextSchema = z.object({
userRole: z.enum(["expert", "beginner"]).default("user"),
userRole: z.enum(["expert", "beginner"]),
});

const agent = createReactAgent({
Expand All @@ -167,7 +168,8 @@ const agent = createReactAgent({

// Use with context
await agent.invoke({
messages: [new HumanMessage("Explain async programming")],
messages: [new HumanMessage("Explain async programming")]
}, {
context: { userRole: "expert" },
});
```
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