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chore(oss/js): fix ToolRuntime references in docs #1338

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Nov 7, 2025
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chore(oss/js): fix ToolRuntime references in docs #1338

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25 changes: 9 additions & 16 deletions src/oss/langchain/context-engineering.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -691,7 +691,7 @@ import { tool } from "@langchain/core/tools";
import { z } from "zod";

const searchOrders = tool(
async ({ userId, status, limit = 10 }) => {
async ({ userId, status, limit }) => {
// Implementation here
},
{
Expand Down Expand Up @@ -1612,11 +1612,10 @@ Most real-world tools need more than just the LLM's parameters. They need user I

```typescript
import * as z from "zod";
import { tool } from "@langchain/core/tools";
import { createAgent } from "langchain";
import { createAgent, tool, type ToolRuntime } from "langchain";

const checkAuthentication = tool(
async (_, { runtime }) => {
async (_, runtime: ToolRuntime) => {
// Read from State: check current auth status
const currentState = runtime.state;
const isAuthenticated = currentState.authenticated || false;
Expand Down Expand Up @@ -1683,15 +1682,14 @@ Most real-world tools need more than just the LLM's parameters. They need user I

```typescript
import * as z from "zod";
import { tool } from "@langchain/core/tools";
import { createAgent } from "langchain";
import { createAgent, tool, type ToolRuntime } from "langchain";

const contextSchema = z.object({
userId: z.string(),
});

const getPreference = tool(
async ({ preferenceKey }, { runtime }) => {
async ({ preferenceKey }, runtime: ToolRuntime) => {
const userId = runtime.context.userId;

// Read from Store: get existing preferences
Expand Down Expand Up @@ -1781,7 +1779,7 @@ Most real-world tools need more than just the LLM's parameters. They need user I
});

const fetchUserData = tool(
async ({ query }, { runtime }) => {
async ({ query }, runtime: ToolRuntime<any, typeof contextSchema>) => {
// Read from Runtime Context: get API key and DB connection
const { userId, apiKey, dbConnection } = runtime.context;

Expand Down Expand Up @@ -1856,7 +1854,7 @@ and update the memory of the agent to make important context available to future
import { Command } from "@langchain/langgraph";

const authenticateUser = tool(
async ({ password }, { runtime }) => {
async ({ password }) => {
// Perform authentication
if (password === "correct") {
// Write to State: mark as authenticated using Command
Expand Down Expand Up @@ -1929,15 +1927,10 @@ and update the memory of the agent to make important context available to future

```typescript
import * as z from "zod";
import { tool } from "@langchain/core/tools";
import { createAgent } from "langchain";

const contextSchema = z.object({
userId: z.string(),
});
import { createAgent, tool, type ToolRuntime } from "langchain";

const savePreference = tool(
async ({ preferenceKey, preferenceValue }, { runtime }) => {
async ({ preferenceKey, preferenceValue }, runtime: ToolRuntime<any, typeof contextSchema>) => {
const userId = runtime.context.userId;

// Read existing preferences
Expand Down