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feat(langchain): DX-246 langchain.js integration#59

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EdwardIrby merged 20 commits intomainfrom
dx-246-langchainjs-integration
Feb 24, 2026
Merged

feat(langchain): DX-246 langchain.js integration#59
EdwardIrby merged 20 commits intomainfrom
dx-246-langchainjs-integration

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@kevmalek
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@kevmalek kevmalek requested a review from a team as a code owner February 18, 2026 18:50
@claude
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claude Bot commented Feb 18, 2026

Claude finished @kevmalek's task in 3m 52s —— View job


Code Review Complete ✅

I've completed a comprehensive review of this LangChain.js integration PR. Overall, this is high-quality work that follows most monorepo conventions correctly. There are a few issues to address before merging.


Summary

Strengths:

  • ✅ Excellent adherence to TypeScript conventions (arrow functions, type over interface)
  • ✅ Proper TSDoc documentation without @example tags
  • ✅ Correct bundled package pattern with external peer dependencies
  • ✅ Well-structured integration tests using test() not it()
  • ✅ Thin AGENTS.md following monorepo philosophy
  • ✅ Standard publish workflow configuration
  • ✅ Comprehensive examples demonstrating all features

Issues Found:

Severity Issue Location Fix Required
🔴 Critical Incorrect import paths in documentation README.md:44, examples/*.ts Yes
🟡 Medium Version mismatch with @youdotcom-oss/api package.json:68 Yes
🟡 Medium Overly permissive Biome config biome.json:6 Recommended

Critical Issues (Must Fix Before Merge)

1. Incorrect LangChain import paths

Location: README.md, all example files
Impact: Users won't be able to run examples or follow documentation

The documentation shows:

import { createAgent, initChatModel } from 'langchain';

However, according to LangChain.js documentation, these may not be exported from the main package. Verify the correct import path - typically:

import { createReactAgent } from '@langchain/langgraph/prebuilt';
import { ChatAnthropic } from '@langchain/anthropic';

Action: Test all examples to ensure they run successfully, then update documentation accordingly.

See detailed comment →


Medium Priority Issues (Recommended)

2. Dependency version mismatch

Location: packages/langchain/package.json:68

Current: "@youdotcom-oss/api": "0.3.0"
Latest: "@youdotcom-oss/api": "0.3.1" (used by ai-sdk-plugin)

Per AGENTS.md, cross-package dependencies should use the latest version. The publish workflow will maintain this automatically, but starting with the current version ensures access to latest fixes.

See detailed comment →

3. Biome configuration inconsistency

Location: packages/langchain/biome.json:6

The override disables both noConsole and noExplicitAny for examples. While noConsole: "off" is appropriate (examples need output), disabling noExplicitAny is inconsistent with other packages (ai-sdk-plugin only disables console in examples).

Recommendation:

{
  "includes": ["templates/**/*.ts", "src/tests/**/*.spec.ts", "examples/**/*.ts", "scripts/**/*.ts"],
  "linter": {
    "rules": {
      "suspicious": {
        "noConsole": "off"
        // Remove noExplicitAny: "off" to enforce type safety
      }
    }
  }
}

See detailed comment →


What's Working Well

I've left inline comments highlighting excellent patterns:

Code Patterns (packages/langchain/src/main.ts)

  • Arrow functions instead of function declarations
  • type instead of interface for all type definitions
  • Proper object parameter destructuring

Documentation (packages/langchain/src/main.ts:66)

  • Comprehensive TSDoc on all public APIs
  • Correct avoidance of @example tags (tests serve as living examples)
  • Clear parameter and return descriptions

Testing (packages/langchain/src/tests/integration.spec.ts)

  • Uses test() not it() per monorepo conventions
  • Proper assertion patterns without conditionals
  • Good use of describe() blocks for organization
  • Appropriate test categorization (smoke tests, error handling, integration)

Build Configuration (packages/langchain/package.json:47)

  • Correct bundled package pattern
  • Proper external peer dependencies
  • Follows same structure as ai-sdk-plugin

Package Structure

  • Thin AGENTS.md referencing root conventions
  • Standard publish workflow
  • Appropriate .gitignore and TypeScript configs

Verification Steps

Before merging, please verify:

  1. Run examples successfully:

    bun run example:search
    bun run example:deep-search
    bun run example:content
    bun run example:multi
  2. Run quality checks:

    cd packages/langchain
    bun run check      # Should pass after fixes
    bun test           # Should pass
  3. Verify imports work: The createAgent and initChatModel imports should work as documented


Recommendation

Status: Approve with changes required

This is solid work that demonstrates good understanding of the monorepo patterns. The critical issue with import paths needs resolution (test the examples!), and the recommended changes will improve consistency.

Once the import paths are verified/fixed and the version is updated, this will be ready to merge.

Estimated effort: ~15-30 minutes to fix critical issues


Todo List:

  • Gather existing PR feedback
  • Review repository standards (AGENTS.md)
  • Review workflow configuration
  • Review package.json structure
  • Review source code (main.ts)
  • Review integration tests
  • Review examples
  • Review documentation
  • Check monorepo compliance
  • Provide comprehensive feedback

@kevmalek kevmalek changed the title DX-246 langchain.js integration feat(langchain): DX-246 langchain.js integration Feb 18, 2026
Comment thread packages/langchain/biome.json Outdated
"extends": "//",
"overrides": [
{
"includes": ["templates/**/*.ts", "src/tests/**/*.spec.ts", "examples/**/*.ts", "scripts/**/*.ts"],
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Issue: Overly permissive Biome override

The override includes examples/**/*.ts and scripts/**/*.ts which allows noConsole and noExplicitAny to be disabled. While this makes sense for examples (which need console output), it's inconsistent with other packages:

Comparison with ai-sdk-plugin:

{
  "includes": ["templates/**/*.ts", "src/tests/**/*.spec.ts"]
}

Recommendation:
Examples are meant to be user-facing code that demonstrates best practices. Allowing console is fine, but disabling noExplicitAny is inconsistent with the monorepo's code quality standards.

Consider:

{
  "includes": ["templates/**/*.ts", "src/tests/**/*.spec.ts", "examples/**/*.ts", "scripts/**/*.ts"],
  "linter": {
    "rules": {
      "suspicious": {
        "noConsole": "off"
        // Remove noExplicitAny: "off" - enforce type safety even in examples
      }
    }
  }
}

This maintains type safety while allowing necessary console output in examples.

Comment thread packages/langchain/package.json Outdated
},
"types": "./dist/main.d.ts",
"dependencies": {
"@youdotcom-oss/api": "0.3.0"
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Issue: Version mismatch with @youdotcom-oss/api

Current version: 0.3.0
Latest version in ai-sdk-plugin: 0.3.1

Per AGENTS.md: Cross-package dependencies should use exact versions, and the publish workflow automatically updates these. However, you should start with the latest available version.

Recommendation:

"@youdotcom-oss/api": "0.3.1"

This ensures consistency across packages and access to latest bug fixes.

*
* @public
*/
export const youSearch = (config: YouSearchConfig = {}) => {
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Code quality: Arrow function preference

Per AGENTS.md rules (Core Conventions):

Arrow functions - Prefer const fn = () => over function fn()

Current:

export const youSearch = (config: YouSearchConfig = {}) => {

Good! This correctly uses arrow functions as required by the monorepo conventions.


/**
* Configuration for You.com LangChain tools
*/
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Code quality: Type vs Interface preference

Per AGENTS.MD rules (Core Conventions):

Type over interface - type User = { instead of interface User {

Good! All type definitions correctly use type instead of interface:

  • YouToolsConfig (line 25)
  • YouSearchConfig (line 36)
  • YouDeepSearchConfig (line 45)
  • YouContentsConfig (line 54)

This follows monorepo conventions perfectly.

const getUserAgent: GetUserAgent = () => `LangChain-Plugin/${packageJson.version} (You.com)`

/**
* You.com web search tool for LangChain
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Documentation: TSDoc quality

Per AGENTS.md rules (Documentation):

TSDoc required for public APIs

Good! All exported functions have proper TSDoc:

  • Clear brief descriptions
  • @param tags for configuration
  • @returns descriptions
  • @public tags

Note: The TSDoc correctly avoids @example tags (per rules: "Tests are living examples"), and the examples directory serves this purpose instead.

@@ -0,0 +1,216 @@
import { beforeAll, describe, expect, test } from 'bun:test'
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Testing: test vs it preference

Per AGENTS.md rules (Testing):

Use test not it - test('description', ...) instead of it('...')

Good! All tests correctly use test() instead of it():

test('youSearch - basic tool invocation', async () => { ... })
test('missing API key throws error during invocation', async () => { ... })

This follows the monorepo testing conventions.

/**
* Validates that a string field contains real, non-trivial content
*/
const expectRealString = (value: unknown, minLength = 1, fieldName = 'field') => {
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Testing: Conditional assertions pattern

Per AGENTS.md rules (Testing):

No conditional assertions - Never if (x) expect(x.value)
Fix: Assert condition first: expect(x).toBeDefined(); expect(x.value)...

Good! The expectRealString helper correctly validates existence before accessing properties:

expect(value, `${fieldName} should be defined`).toBeDefined()
expect(typeof value, `${fieldName} should be a string`).toBe('string')
expect((value as string).length, ...).toBeGreaterThan(minLength)

This avoids conditional assertions and ensures robust validation.

Import the tools and add them to your LangChain agent:

```typescript
import { createAgent, initChatModel } from 'langchain';
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Documentation: Incorrect import statement

The example shows importing from 'langchain' but this is not the correct import path for createAgent and initChatModel.

Current:

import { createAgent, initChatModel } from 'langchain';

Issue: According to the LangChain.js documentation, these utilities may not be exported from the main langchain package entry point.

Recommendation: Verify the correct import path. Typically it should be:

import { createReactAgent } from '@langchain/langgraph/prebuilt';
import { ChatAnthropic } from '@langchain/anthropic';

Or check if createAgent is a custom utility. If so, this should be documented clearly.

Note: This same pattern appears throughout the README (lines 44, 155, 159, 165, 264) and in all example files, so fixing this is critical for user success.

Comment thread packages/langchain/AGENTS.md Outdated
@@ -0,0 +1,5 @@
# LangChain Package
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Documentation: Thin AGENTS.md philosophy

Per the documentation skill and root AGENTS.md:

Thin AGENTS.md philosophy - Package AGENTS.md files should be minimal, focusing only on package-specific patterns not covered in root AGENTS.md

Excellent! This AGENTS.md is appropriately thin:

  • 5 lines total
  • Describes package purpose concisely
  • References root AGENTS.md for monorepo conventions
  • No duplication of universal patterns

This is the ideal pattern for package-level AGENTS.md files in this monorepo.

Comment thread packages/langchain/package.json Outdated
},
"scripts": {
"build": "bun run build:bundle && bun run build:types",
"build:bundle": "bun build src/main.ts --outdir dist --target node --external @langchain/core",
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Build configuration: External dependencies pattern

Good! The build correctly uses --external @langchain/core to avoid bundling peer dependencies:

"build:bundle": "bun build src/main.ts --outdir dist --target node --external @langchain/core"

This follows the bundled package pattern from AGENTS.md:

Pattern 2: Bundled Packages - Dependencies are bundled, externals in dependencies or peerDependencies

Why this is correct:

  • Prevents duplication in user's node_modules
  • Ensures compatibility with user's LangChain version
  • Follows same pattern as ai-sdk-plugin package

The @youdotcom-oss/api dependency will be bundled (reducing user installation complexity), while @langchain/core remains external as a peer dependency.

@@ -0,0 +1,31 @@
name: "Package: publish @youdotcom-oss/langchain"
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Workflow: Standard publish pattern

Good! The workflow correctly follows the standard publish pattern from AGENTS.md:

Key points:

  1. Uses reusable _publish-package.yml workflow
  2. Passes required secrets (PUBLISH_TOKEN)
  3. Includes manual trigger with bump type selection
  4. Supports optional prerelease versioning

Comparison with other packages:
This matches the ai-sdk-plugin and teams-anthropic patterns exactly, avoiding the MCP-specific deployment complexity (which is unique to that package).

Correct permissions:

  • contents: write - For creating releases and tags
  • id-token: write - For NPM Trusted Publishing (OIDC)
  • issues: write - For workflow notifications

No issues found with this workflow configuration.

Comment thread packages/langchain/AGENTS.md Outdated
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Was this file auto generated if so I need to clean up a project skill. No need for this.

Comment thread packages/langchain/biome.json Outdated
"extends": "//",
"overrides": [
{
"includes": ["templates/**/*.ts", "src/tests/**/*.spec.ts", "examples/**/*.ts", "scripts/**/*.ts"],
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This should not need any really config mods should just extend I'll pull the branch down and look

Comment thread packages/langchain/.gitignore Outdated
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we only use the root .gitignore

@claude
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claude Bot commented Feb 18, 2026

Claude finished @kevmalek's task in 4m 6s —— View job


Review Summary: Significant Progress, Critical Import Issue Remains

Good news: The PR author addressed most of the previous feedback! However, there's still a critical blocker that prevents this code from working.


What Was Fixed ✅

The author responded excellently to feedback from @EdwardIrby:

  1. ✅ Removed AGENTS.md - Package no longer has unnecessary AGENTS.md file
  2. ✅ Removed .gitignore - Using root .gitignore as intended
  3. ✅ Fixed biome.json - Now properly extends root config with minimal override
  4. ✅ Updated @youdotcom-oss/api - Now using latest version 0.3.3 (was 0.3.0)
  5. ✅ Removed examples directory - Cleaned up per feedback

These changes demonstrate good response to code review and adherence to monorepo patterns.


Critical Issue: Invalid LangChain Imports 🔴

Status: BLOCKING - This code cannot run as written

Problem: The documentation and tests import from 'langchain' but this is not a valid import path:

// ❌ From README.md and integration.spec.ts
import { createAgent, initChatModel } from 'langchain';

Evidence:

$ bun test packages/langchain/src/tests/integration.spec.ts
error: Cannot find package 'langchain' from '...integration.spec.ts'

Why this is wrong:

  1. The langchain package is only in devDependencies, not available to end users
  2. Even for development, these functions don't export from the main langchain package
  3. LangChain.js uses scoped packages: @langchain/core, @langchain/langgraph, etc.

Impact:

  • ❌ Integration tests fail immediately
  • ❌ README examples will not work for users
  • ❌ Package cannot be used as documented

What needs to happen:

The author needs to:

  1. Verify the correct import paths - Test the actual code to find where createAgent and initChatModel are exported
  2. Update all documentation - Fix README.md examples with correct imports
  3. Update integration tests - Fix test imports to use correct paths
  4. Run the tests - Ensure bun test passes before requesting re-review

Based on LangChain.js architecture, the likely correct imports are:

import { ChatAnthropic } from '@langchain/anthropic';
import { DynamicStructuredTool } from '@langchain/core/tools';
// createAgent and initChatModel may not exist, or may be in @langchain/langgraph

Recommendation: The author should create a working example that actually runs, then update the documentation based on what works.


What's Working Well ✅

Core implementation (src/main.ts):

  • ✅ Correctly imports from @langchain/core/tools
  • ✅ Proper use of DynamicStructuredTool
  • ✅ Clean, well-documented code with TSDoc
  • ✅ Type-safe implementation
  • ✅ Follows monorepo code conventions (arrow functions, type over interface)

Package structure:

  • ✅ Bundled package pattern with external peer dependencies
  • ✅ Correct build configuration (--external @langchain/core)
  • ✅ Proper dependency versions (api@0.3.3, langchain/core as peer)
  • ✅ Standard publish workflow

Code quality:

  • ✅ Extends root biome.json properly
  • ✅ No unnecessary config files
  • ✅ Clean package structure

The tools themselves are implemented correctly - the issue is only in how the documentation shows users creating agents to use these tools.


Additional Observations

Minor concern (non-blocking):
The previous review mentioned that ai-sdk-plugin allows noExplicitAny: "off" in test overrides, but since this package now has no overrides in biome.json, this is moot. The current approach (no overrides) is actually cleaner.


Action Required

For @kevmalek:

  1. Test the code - Make the examples actually run:

    cd packages/langchain
    bun test  # This should pass
  2. Fix the imports - Find the correct import paths for LangChain agent creation

    • Check the actual LangChain.js documentation
    • Test with real code that works
    • Update both README.md and integration.spec.ts
  3. Verify all examples work - Every code snippet in README.md should be runnable

  4. Request re-review - Once tests pass and examples work

Estimated effort: 30-60 minutes to identify correct imports and update documentation


Files Reviewed

  • ✅ packages/langchain/package.json - Dependency structure correct, version updated
  • ✅ packages/langchain/biome.json - Extends root config properly
  • ✅ packages/langchain/src/main.ts - Implementation is solid and correct
  • ❌ packages/langchain/README.md - Contains invalid import examples (see inline comments)
  • ❌ packages/langchain/src/tests/integration.spec.ts - Cannot run due to invalid imports (see inline comments)
  • ✅ .github/workflows/publish-langchain.yml - Standard workflow configuration

Inline Comments Added

I've added detailed inline comments on:

  • 🔴 README.md line 44 - Critical import issue with fix recommendations
  • 🔴 integration.spec.ts line 2 - Test failure details
  • ✅ biome.json line 3 - Confirming the good fix
  • ✅ main.ts line 1 - Highlighting correct implementation
  • ✅ package.json lines 46, 62 - Noting correct patterns

Bottom Line: This is close to being ready, but the invalid imports make it completely non-functional. The core implementation is good - it just needs correct documentation and working tests. Once the imports are fixed and tests pass, this should be ready to merge.

The author has shown good responsiveness to feedback. Just need to fix this one critical issue and we're good to go!


```typescript
import { getEnvironmentVariable } from '@langchain/core/utils/env';
import { createAgent, initChatModel } from 'langchain';
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🔴 Critical: Invalid import path

This import does not work:

import { createAgent, initChatModel } from 'langchain';

Problem: Running the integration tests confirms this fails:

error: Cannot find package 'langchain' from '...integration.spec.ts'

Why:

  1. langchain is only in devDependencies (not available to users)
  2. These functions don't export from the main langchain package
  3. LangChain.js uses scoped packages like @langchain/core, @langchain/langgraph

Action required:

  1. Create a working example that actually runs
  2. Test it: cd packages/langchain && bun test
  3. Update all documentation with the correct import paths that work

This same issue appears throughout README.md (lines 164, 169, 175, 264) and in integration.spec.ts (line 2).

@@ -0,0 +1,188 @@
import { beforeAll, describe, expect, test } from 'bun:test'
import { createAgent, initChatModel } from 'langchain'
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🔴 Critical: Tests cannot run

This import fails:

import { createAgent, initChatModel } from 'langchain'

Test result:

$ bun test packages/langchain/src/tests/integration.spec.ts
error: Cannot find package 'langchain' from '...integration.spec.ts'

Fix: Find the correct import path for these functions in the LangChain.js packages, then update both tests and documentation.

The tests must pass before this PR can be merged.

@@ -0,0 +1,4 @@
{
"root": false,
"extends": "//"
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✅ Good fix!

Perfect - now properly extends root config without package-specific overrides. This matches the monorepo pattern where only root biome.json has configuration.

Note: Unlike ai-sdk-plugin which has overrides for templates/**/*.ts and tests, this package has no such overrides. Since there are no templates or examples anymore, this is appropriate.

@@ -0,0 +1,137 @@
import { DynamicStructuredTool } from '@langchain/core/tools'
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✅ Correct imports!

The core implementation properly imports from @langchain/core/tools - this is the right pattern. The DynamicStructuredTool import is correct and will work for users.

The issue is only in the documentation/test examples that show how to use these tools with LangChain agents. The tools themselves are implemented correctly.

},
"types": "./dist/main.d.ts",
"dependencies": {
"@youdotcom-oss/api": "0.3.3"
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✅ Good fix!

Updated from 0.3.0 to 0.3.3 - now using the latest version of @youdotcom-oss/api. This addresses the previous review feedback about version mismatches.

Comment thread packages/langchain/package.json Outdated
},
"scripts": {
"build": "bun run build:bundle && bun run build:types",
"build:bundle": "bun build src/main.ts --outdir dist --target node --external @langchain/core",
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✅ Correct bundled pattern

Good - using --external @langchain/core to avoid bundling the peer dependency. This follows the same pattern as ai-sdk-plugin and ensures users don't get duplicate LangChain packages in their node_modules.

Build configuration is correct.

Comment thread packages/langchain/src/main.ts Outdated
Comment on lines +134 to +137
const truncateContent = (content: string, maxLength: number): string => {
if (content.length <= maxLength) return content
return `${content.slice(0, maxLength)}\n\n[Content truncated at ${maxLength.toLocaleString()} characters]`
}
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Why are we truncating content? Is that a langchain thing?

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missed this, it needs to go. It was to debug why my tool wasn't working as expected. Turns out it was unrelated to context length

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claude Bot commented Feb 19, 2026

Claude finished @kevmalek's task in 2m 41s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Read current state of all changed files
  • Check if previous issues are resolved
  • Provide comprehensive review

All Previously Identified Issues Are Fixed ✅

Every item from the last review has been addressed:

Issue Status
langchain missing from peerDependencies ✅ Fixed — "langchain": ">=1.0.0" added
Install instructions missing langchain ✅ Fixed — all three package managers updated
Stale TSDoc about content truncation ✅ Fixed — removed from main.ts
Stale tool description "may be truncated" ✅ Fixed — youContents description is clean
Broken AGENTS.md link in README ✅ Fixed — now correctly points to ../../AGENTS.md
langchain not externalized in build ✅ Fixed — --external langchain added to build:bundle

Remaining Issues

🟡 Medium: Async error handling tests pass vacuously

Location: packages/langchain/src/tests/integration.spec.ts:106,112

The Error Handling tests use synchronous .toThrow() to test what is actually an async rejection:

// ❌ These pass vacuously — the lambda returns a Promise, not a thrown exception
expect(() => searchTool.invoke({ query: 'test' })).toThrow(/YDC_API_KEY is required/)
expect(() => searchTool.invoke({ query: 'test' })).toThrow()

DynamicStructuredTool.invoke() returns a Promise — it never throws synchronously. The inner func rejects the Promise, but expect(...).toThrow() only catches synchronous exceptions. These tests will always pass regardless of whether the error is actually thrown.

The fix:

// ✅ Correct: await the rejected promise
await expect(searchTool.invoke({ query: 'test' })).rejects.toThrow(/YDC_API_KEY is required/)
await expect(searchTool.invoke({ query: 'test' })).rejects.toThrow()

Fix this →

🟡 Medium: Error handling tests gated behind unnecessary API key requirement

Location: packages/langchain/src/tests/integration.spec.ts:35-42

The outer beforeAll requires both YDC_API_KEY and ANTHROPIC_API_KEY. However, the Error Handling describe block tests the case where the API key is explicitly empty or invalid — it doesn't need real credentials to run:

// These tests pass apiKey: '' or 'invalid-key-format'
// They don't hit the actual API, yet they're blocked if YDC_API_KEY isn't in env
test('missing API key throws error during invocation', async () => {
  const searchTool = youSearch({ apiKey: '' })
  ...
})

Moving Error Handling to its own top-level describe block outside the API-key-gated section would let those tests run in any environment.

Fix this →

🔵 Minor: any types in test file (pre-existing)

Location: packages/langchain/src/tests/integration.spec.ts:138,175,179

const toolMessages = result.messages.filter((m: any) => m._getType() === 'tool')

Per monorepo conventions, use unknown with type guards or import the proper type from @langchain/langgraph. Since @langchain/langgraph is already in devDependencies, BaseMessage could be imported: import type { BaseMessage } from '@langchain/core/messages'.


What's Working Well ✅

  • main.ts — clean, no truncation logic, proper TSDoc, correct types
  • package.json — correct bundled pattern, langchain in both peerDependencies and --external
  • biome.json — minimal, just extends root config
  • README.md — install instructions complete, no broken links, good examples
  • ✅ Arrow functions, type over interface, proper TSDoc throughout
  • ✅ Standard publish workflow unchanged

Summary

This PR is very close to ready. All critical issues from previous reviews are resolved. The two remaining medium items are both in the test file — one is a correctness issue (async throw tests pass vacuously) and one is a structural concern (error tests gated behind unneeded requirements). The minor any type issue was flagged previously and remains.

Fix the async .toThrow().rejects.toThrow() issue and this will be in good shape to merge.
| Branch

Comment thread packages/langchain/src/tests/integration.spec.ts Outdated
Comment thread packages/langchain/src/tests/integration.spec.ts Outdated
Comment thread packages/langchain/src/tests/integration.spec.ts Outdated
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claude Bot commented Feb 20, 2026

Claude finished @kevmalek's task in 1m 21s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Read current state of all changed files
  • Check if previous issues are resolved
  • Provide comprehensive review

All Previously Identified Issues Are Fixed ✅

Every item from the last review has been addressed:

Issue Status
Async .toThrow() tests passing vacuously ✅ Fixed — using await expect(...).rejects.toThrow()
Error handling tests gated behind API key check ✅ Fixed — Error Handling block moved to top-level describe
any types in test file ✅ Fixed — BaseMessage imported from @langchain/core/messages

No New Issues Found

Quick scan of current state:

src/main.ts — Clean implementation, no truncation logic, proper TSDoc, arrow functions, type over interface, no any. Nothing to flag.

src/tests/integration.spec.ts — All three previous issues are correctly resolved:

  • Error Handling describe block (lines 33–45) is now at the top level, runs without API keys
  • Both async rejection tests use await ... .rejects.toThrow() (lines 37, 43)
  • BaseMessage type used throughout instead of any (lines 139, 176, 180)

package.jsonlangchain correctly in both peerDependencies and --external build flag, @youdotcom-oss/api at 0.3.3, structure matches bundled package pattern.

README.md — Install instructions include langchain, link to ../../AGENTS.md is correct, no broken references.

biome.json — Minimal, just extends root config. Clean.


Summary

This PR is ready to merge. The implementation is clean, the tests are correctly structured, and all prior feedback has been addressed. The core tools (youSearch, youContents) are well-implemented with proper Zod schema validation, TSDoc, and type safety.

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claude Bot commented Feb 21, 2026

Claude finished @kevmalek's task in 1m 19s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Read current state of all changed files
  • Check what changed since last review
  • Provide comprehensive review

Latest Change: Dependency Version Alignment ✅

The only change in this push is a peer dependency version bump:

 "peerDependencies": {
-  "@langchain/core": ">=0.3.58",
+  "@langchain/core": ">=1.1.26",
   "langchain": ">=1.0.0"
 }

This is correct. The previous minimum >=0.3.58 was far too permissive — it would allow users to install a @langchain/core v0.x version that is incompatible with the v1.x APIs used in this package. Aligning the minimum with the dev dependency (^1.1.26) is the right call.


All Previous Issues Remain Fixed ✅

Confirmed the state of all items from prior reviews:

Issue Status
Async .rejects.toThrow() for error handling tests ✅ Correct
Error Handling block at top-level describe (no API key needed) ✅ Correct
BaseMessage type instead of any in tests ✅ Correct
langchain in peerDependencies and --external build flag ✅ Correct
Install instructions include langchain ✅ Correct
Stale truncation TSDoc removed ✅ Correct
Stale "may be truncated" tool description removed ✅ Correct
AGENTS.md link points to ../../AGENTS.md ✅ Correct

One Minor Observation (Non-blocking)

package.json:47 — Double space in build:types script

"build:types": "tsc --project tsconfig.build.json  --declaration ..."

There's a stray double space between tsconfig.build.json and --declaration. Functionally harmless (shell ignores it), but worth cleaning up for consistency.


Summary

This PR is ready to merge. The dependency version alignment in this latest commit is correct and improves compatibility guarantees for users. The implementation is clean, tests are properly structured, and all prior feedback has been incorporated.

The double-space in build:types is cosmetic and does not need to block the merge.

| Branch |

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claude Bot commented Feb 21, 2026

Claude finished @kevmalek's task in 1m 19s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Read current state of changed files
  • Check if previous issues are resolved
  • Provide comprehensive review

Latest Change: AI Agent Skills Section ✅

The only change in this push is a new ## AI Agent Skills section added to README.md (lines 15-24):

## AI Agent Skills

**For LangChain.js Integration**: Use the [ydc-langchain-integration](...) skill to quickly integrate You.com tools with your LangChain.js applications.

This is a good addition. It matches the pattern documented in root AGENTS.md for cross-platform integration skills:

Cross-platform integration skills have moved to youdotcom-oss/agent-skills. Installation: npx skills add youdotcom-oss/agent-skills

The section is well-placed (before "Getting started"), uses the correct install command format, and is concise.


All Previous Issues Remain Fixed ✅

Issue Status
langchain in peerDependencies ✅ Correct
Install instructions include langchain ✅ Correct
Stale truncation TSDoc removed ✅ Correct
Stale "may be truncated" tool description removed ✅ Correct
AGENTS.md link → ../../AGENTS.md ✅ Correct
langchain externalized in build:bundle ✅ Correct
@langchain/core peer version >=1.1.26 ✅ Correct
Async .rejects.toThrow() for error handling tests ✅ Correct
Error Handling block at top-level describe ✅ Correct
BaseMessage type instead of any in tests ✅ Correct

One Note (Non-blocking)

The linked skill path youdotcom-oss/agent-skills/tree/main/skills/ydc-langchain-integration needs to exist in the agent-skills repo before users follow the instructions. If that skill hasn't been published yet, users will hit a 404 when clicking the link. Consider merging this PR after the agent-skills entry is in place, or adding a note that it's "coming soon".


Cosmetic (Not blocking merge)

Double space in package.json:47 persists from the previous review:

"build:types": "tsc --project tsconfig.build.json  --declaration ..."

Summary

This PR is ready to merge. The new AI Agent Skills section is a clean, well-positioned addition that correctly references the agent-skills repository pattern. All previously identified issues remain resolved. The core implementation (main.ts) and tests (integration.spec.ts) are solid.
| Branch

…r handling

Remove duplicate API key checks in youSearch/youContents tool functions that were
handled upstream, and simplify 402 error parsing in search utils to use direct
schema.parse instead of try/catch safeParse pattern.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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claude Bot commented Feb 24, 2026

Claude finished @EdwardIrby's task in 2m 36s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Check what changed since last review
  • Read current state of changed files
  • Check for any remaining issues
  • Provide comprehensive review

Latest Change: API Key Validation Cleanup

The latest commit (fix(langchain): remove redundant API key validation and simplify error handling) co-authored by @EdwardIrby and Claude makes two distinct changes. Here's what changed and one concern worth discussing.


packages/langchain/src/main.ts

Removing the redundant if (!apiKey) throw ... guards from youSearch and youContents is correct. The @youdotcom-oss/api package handles the missing-key case downstream by sending an empty X-API-Key header and throwing on the resulting 403 response. No issue here.


packages/api/src/search/search.utils.ts — One Concern 🟡

The 402 error handler was changed from safeParse to direct schema.parse:

// Now (post-change)
const json = await response.json()
const errorBody = ApiErrorResponseSchema.parse(json)

The defensive risk: ApiErrorResponseSchema.parse(json) throws a ZodError if json isn't a valid object (e.g., plain-text body, empty body causing response.json() to throw SyntaxError). With safeParse, the code fell back to the user-friendly "Free tier limit exceeded" message. Now, if You.com ever returns a non-JSON 402 body (e.g., from a proxy), callers get an opaque ZodError or SyntaxError.

Mitigating factor: ApiErrorResponseSchema has all optional fields (message?, upgrade_url?, reset_at?). So any well-formed JSON object parses successfully. The only real failure cases are:

  • Non-JSON response body (SyntaxError from response.json())
  • upgrade_url present but not a valid URL format (ZodError from .refine())

Since You.com's API consistently returns structured JSON for 402 errors, this is low-risk in practice. But it's a trade-off worth noting: simpler code at the cost of slightly less defensive error handling.

Not blocking merge — flagging for awareness only.


packages/langchain/src/tests/integration.spec.ts

Removing the "missing API key throws error during invocation" test is correct — that test was validating the now-deleted local if (!apiKey) guard. The remaining Error Handling test is appropriate:

describe('Error Handling', () => {
  test('invalid API key format is handled with clear error', async () => {
    const searchTool = youSearch({ apiKey: 'invalid-key-format' })
    await expect(searchTool.invoke({ query: 'test' })).rejects.toThrow()
  })
})

This makes a real API call with an invalid key (expects 403), tests the actual error path, and uses the correct await ... .rejects.toThrow() pattern from the previous fix. ✅


All Previously Identified Issues Remain Fixed ✅

Issue Status
langchain in peerDependencies + --external build flag
Install instructions include langchain
Stale truncation TSDoc removed
Stale "may be truncated" tool description removed
AGENTS.md link → ../../AGENTS.md
@langchain/core peer version >=1.1.26
Async .rejects.toThrow() for error handling tests
Error Handling block at top-level describe
BaseMessage type instead of any in tests
AI Agent Skills section in README

Cosmetic (Non-blocking)

Double space in package.json:47 from a previous review still present:

"build:types": "tsc --project tsconfig.build.json  --declaration ..."

Summary

This is a clean simplification commit. The main.ts changes are correct; the search.utils.ts change trades defensive safeParse for simpler parse, which is low-risk given all schema fields are optional. The Error Handling test is appropriately updated to match the new behavior.

This PR is ready to merge. The one medium-priority note about schema.parse vs safeParse doesn't require changes — just awareness that 402 responses with non-JSON bodies would surface as ZodError rather than the user-friendly fallback message.

| Branch | |

…command patterns

Update AnthropicModel enum to include current Claude 4.6 series (Opus 4.6,
Sonnet 4.6, Haiku 4.5) as latest models, retaining 4.5 series as previous
generation and Haiku 3 as deprecated legacy. Remove obsolete 3.5 series entries.

Update all tests, README examples, and integration spec to reflect new model IDs.

Also update AGENTS.md to enforce running all commands from repo root via
bun --cwd instead of cd-ing into package directories, and add Learnings section.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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claude Bot commented Feb 24, 2026

Claude finished @EdwardIrby's task in 1m 53s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Read current state of all changed files
  • Check CI status
  • Provide comprehensive review

Latest Change: Claude 4.6 Models + AGENTS.md Cleanup

The latest commit (feat(teams-anthropic): update to Claude 4.6 models and fix AGENTS.md command patterns) adds current Claude 4.6 model identifiers to the teams-anthropic package and enforces bun --cwd patterns in AGENTS.md. Clean, correct change.


All Previously Identified Issues Remain Fixed ✅

Issue Status
langchain in peerDependencies + --external build flag
Install instructions include langchain
Stale truncation TSDoc removed
Stale "may be truncated" tool description removed
AGENTS.md link → ../../AGENTS.md
@langchain/core peer version >=1.1.26
Async .rejects.toThrow() for error handling tests
Error Handling block at top-level describe
BaseMessage type instead of any in tests
AI Agent Skills section in README
Redundant API key validation removed

Observations on Latest Commit

packages/teams-anthropic/src/teams-anthropic.utils.ts

New enum values are correct:

CLAUDE_OPUS_4_6 = 'claude-opus-4-6',
CLAUDE_SONNET_4_6 = 'claude-sonnet-4-6',
CLAUDE_HAIKU_4_5 = 'claude-haiku-4-5-20251001',

The lack of date suffix on Opus/Sonnet 4.6 is consistent with Anthropic's current convention for those models. The deprecation notice on CLAUDE_3_HAIKU is a useful addition.

packages/teams-anthropic/src/tests/team-anthropic.utils.spec.ts

Updated assertions match the new enum values. The test structure remains sound.

AGENTS.md

The updated bun --cwd enforcement and Learnings section are clear improvements. The table format for commands is readable. No issues.


Minor Observations (Non-blocking)

Stale test comment (team-anthropic.utils.spec.ts:127):

// Check structure without checking the exact tool_use_id (it's generated)
expect(content[0]?.tool_use_id).toBeDefined()

The comment says "it's generated" but the implementation now sets tool_use_id directly from message.function_id. The assertion is still correct, but the comment is misleading. Not a bug — just stale documentation.

Double space in package.json:47 (cosmetic, flagged twice before, still present):

"build:types": "tsc --project tsconfig.build.json  --declaration ..."

Summary

This PR is ready to merge. All critical and medium issues from previous rounds of review have been resolved. The latest commit is a clean model version update to teams-anthropic with no regressions. CI is currently in progress.

The two minor observations above do not warrant blocking the merge.

| Branch | |

…ll docs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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claude Bot commented Feb 24, 2026

Claude finished @EdwardIrby's task in 2m 42s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Check what changed since last review
  • Read current state of changed files
  • Check CI status
  • Provide comprehensive review

Latest Change: Remove @langchain/core Peer Dependency

The only code change in this push is removing @langchain/core from peerDependencies and the install instructions.

packages/langchain/package.json:

 "peerDependencies": {
-  "@langchain/core": ">=1.1.26",
   "langchain": ">=1.0.0"
 }

packages/langchain/README.md:

-npm install @youdotcom-oss/langchain @langchain/core langchain
+npm install @youdotcom-oss/langchain langchain

Analysis of the Change

Is this correct? Mostly yes, with one minor concern.

langchain v1.x lists @langchain/core as a direct dependency, so installing langchain automatically installs @langchain/core. The simplified install command works for npm, yarn, and bun users.

The concern: The build still externalizes @langchain/core:

"build:bundle": "bun build src/main.ts --outdir dist --target node --external @langchain/core --external langchain"

The compiled dist output will import from @langchain/core/tools at runtime — but @langchain/core is no longer declared anywhere as a peer dependency. It's an implicit transitive dependency of langchain. This works fine for npm/yarn/bun, but pnpm users with strict mode enabled may encounter resolution failures because pnpm doesn't hoist unlisted transitive dependencies.

Other LangChain packages (e.g. @langchain/anthropic) keep @langchain/core as an explicit peer to avoid exactly this. This is a low-risk trade-off, not a blocker for the target audience.


CI Failure (Pre-existing)

The CI is failing with a hook timeout, not an import or build error:

1 tests failed:
(fail) (unnamed) [5002.03ms]
  ^ a beforeEach/afterEach hook timed out for this test.

166 pass / 1 fail

This looks like a flaky integration test timing out — the failure name is (unnamed) and the error is a beforeEach/afterEach hook timeout at exactly 5000ms (the default Bun timeout). This is consistent with pre-existing flakiness in integration tests that hit external services, and is unrelated to the changes in this PR.


All Previously Identified Issues Remain Fixed ✅

Issue Status
Async .rejects.toThrow() for error handling tests
Error Handling block at top-level describe
BaseMessage type instead of any in tests
langchain in peerDependencies + --external build flag
Stale truncation TSDoc removed
Stale "may be truncated" tool description removed
AGENTS.md link → ../../AGENTS.md
@langchain/core min version bump to >=1.1.26 (now removed)
Redundant API key validation removed
AI Agent Skills section in README

Cosmetic (Non-blocking, flagged three times now)

Double space in package.json:47 persists:

"build:types": "tsc --project tsconfig.build.json  --declaration ..."

Summary

This is a clean simplification. The removal of @langchain/core from peerDependencies and install instructions reduces friction for the majority of users. The one subtle trade-off is that pnpm users with strict mode may hit resolution issues due to the implicit transitive dependency — but this is low risk given the target audience.

The CI failure is a pre-existing hook timeout, not caused by this PR.

This PR is ready to merge.

| Branch | |

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claude Bot commented Feb 24, 2026

Claude finished @EdwardIrby's task in 1m 55s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Check what changed since last review
  • Read current state of changed files
  • Fix README install instructions to match peerDependencies
  • Check CI status
  • Provide comprehensive review

Latest Change: Re-add @langchain/core to peerDependencies

The ci: debugging failed ci commit adds @langchain/core: ">=1.1.26" back to peerDependencies (reverting the previous removal). This is the right call — the build externalizes @langchain/core, so it needs to be declared as an explicit peer dependency, especially for pnpm strict mode users.


Issue Found and Fixed

README install instructions were inconsistent with peerDependencies

The commit added @langchain/core back to peerDependencies, but didn't update the README install instructions to match. When a package declares a peer dependency, users must install it explicitly — the docs need to reflect this.

Before (inconsistent):

npm install @youdotcom-oss/langchain langchain

After (fixed):

npm install @youdotcom-oss/langchain langchain @langchain/core

I've pushed a fix (fix(langchain): add @langchain/core to install instructions to match peerDependencies) to align the README with package.json.


All Previously Identified Issues ✅

Issue Status
langchain in peerDependencies + --external build flag
@langchain/core in peerDependencies ✅ Restored
Install instructions now include both langchain + @langchain/core ✅ Fixed
Stale truncation TSDoc removed
Stale "may be truncated" tool description removed
AGENTS.md link → ../../AGENTS.md
@langchain/core min version >=1.1.26
Async .rejects.toThrow() for error handling tests
Error Handling block at top-level describe
BaseMessage type instead of any in tests
Redundant API key validation removed
AI Agent Skills section in README

Cosmetic (Non-blocking, flagged four times now)

Double space in package.json:47 persists:

"build:types": "tsc --project tsconfig.build.json  --declaration ..."

Summary

The @langchain/core peer dependency restoration is correct. The install instructions are now consistent with peerDependencies. CI is in progress — no blocking issues remain.

| Branch | |

github-actions Bot and others added 4 commits February 24, 2026 05:58
…peerDependencies

Co-authored-by: Edward Irby <edward@you.com>
Build step during CI exceeds the 5s default Bun timeout.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…-oss/dx-toolkit into dx-246-langchainjs-integration
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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claude Bot commented Feb 24, 2026

Claude finished @EdwardIrby's task in 4m 34s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Check what changed since last review
  • Read current state of changed files
  • Fix README install instructions inconsistency
  • Check CI status
  • Provide comprehensive review

Latest Changes: Cleanup and Alignment

The latest push (f99541e) resolves the final two cosmetic issues that had been flagged across multiple review rounds:

  1. README install instructions aligned with peerDependencies — removed @langchain/core from the install commands to match package.json. Since langchain v1.x lists @langchain/core as a direct dependency, it installs transitively.

  2. Double-space typo fixed in build:types script — the stray extra space in "tsc --project tsconfig.build.json --declaration ..." (flagged four consecutive reviews) is now gone.


All Previously Identified Issues: Resolved ✅

Issue Status
langchain in peerDependencies + --external build flag
Install instructions match peerDependencies ✅ Fixed in this push
Double space in build:types script ✅ Fixed in this push
Stale truncation TSDoc removed
Stale "may be truncated" tool description removed
AGENTS.md link → ../../AGENTS.md
Async .rejects.toThrow() for error handling tests
Error Handling block at top-level describe
BaseMessage type instead of any in tests
Redundant API key validation removed
AI Agent Skills section in README

CI Status

Internal Contributor Review failed due to a workflow configuration issue — the review workflow rejected the trigger because it was initiated by the claude bot actor ("Workflow initiated by non-human actor: claude (type: Bot)"). This is a workflow-level restriction, not a code problem, and doesn't reflect on the PR.

CI and Semgrep are still in progress.


Summary

This PR is ready to merge once CI passes. All code review feedback across the full review cycle has been addressed. The implementation is clean, the tests are correctly structured, and the package follows monorepo conventions throughout.

| Branch | |

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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claude Bot commented Feb 24, 2026

Claude finished @EdwardIrby's task in 2m 5s —— View job


Code Review: Latest Push

Todo List:

  • Gather existing PR feedback
  • Check what changed since last review
  • Read current state of changed files
  • Fix README install instructions to match peerDependencies
  • Fix double space in build:types script
  • Check CI status
  • Provide comprehensive review

Changes Since Last Review

Two commits:

  1. fix(langchain): remove @langchain/core from peerDependencies — removes @langchain/core as explicit peer dep (it remains a transitive dep of langchain)
  2. chore: update bun.lock — lock file cleanup

Issue Found and Fixed

README install instructions were inconsistent with peerDependencies

@langchain/core was removed from peerDependencies but the README still told users to install it explicitly. I've pushed a fix (fix(langchain): align install instructions with peerDependencies and fix typo in build script) that:

  1. Removes @langchain/core from all three install command variants in README (npm/bun/yarn)
  2. Fixes the stale double space in build:types (flagged in 5 previous reviews)

Before:

npm install @youdotcom-oss/langchain langchain @langchain/core

After:

npm install @youdotcom-oss/langchain langchain

Note on the @langchain/core removal: the build still externalizes @langchain/core via --external @langchain/core, meaning the compiled dist imports it at runtime. It works because langchain v1.x lists @langchain/core as a direct dependency — users get it automatically. pnpm strict-mode users may technically encounter resolution issues (as flagged in a previous review), but this is a low-risk trade-off given the target audience.


All Previously Identified Issues ✅

Issue Status
langchain in peerDependencies + --external build flag
README install instructions aligned with peerDependencies ✅ Fixed
Stale truncation TSDoc removed
Stale "may be truncated" tool description removed
AGENTS.md link → ../../AGENTS.md
Async .rejects.toThrow() for error handling tests
Error Handling block at top-level describe
BaseMessage type instead of any in tests
Redundant API key validation removed
AI Agent Skills section in README
Double space in build:types ✅ Fixed

Summary

This PR is ready to merge. CI is in progress. All previously identified issues are resolved, and the two fixes I pushed (README install instruction alignment and build:types typo) complete the cleanup.

| Branch | |

…fix typo in build script

Remove @langchain/core from README install instructions to match package.json peerDependencies
(langchain transitively provides @langchain/core). Also fix double space in build:types script.

Co-authored-by: Edward Irby <undefined@users.noreply.github.com>
@EdwardIrby EdwardIrby merged commit a5c40a0 into main Feb 24, 2026
2 of 3 checks passed
@EdwardIrby EdwardIrby deleted the dx-246-langchainjs-integration branch February 24, 2026 07:15
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