chore: Upgrade langchain packages

[schrothbn]

Summary

Bumps @langchain/core from 1.1.8 to 1.1.31 to pick up the fix for langchain-ai/langchainjs#9995, which strips empty text content blocks before sending
messages to the API.

Root cause: When an AI Agent uses tool-calling with an Anthropic model via the OpenAI Chat Model node, the assistant message was constructed with "content": "" alongside the tool_calls block. Anthropic (and Anthropic-compatible) endpoints reject this with 400. OpenAI ignores empty content silently, so only Anthropic-compatible backends were affected.

The fix in @langchain/core@1.1.22+ adds a content.length > 0 guard in convertToV1FromChatCompletions before pushing a text block, so empty strings are never sent.

Additional package bumps pulled in alongside the core upgrade:

• langchain: 1.2.3 → 1.2.30 (required — 1.2.30 now correctly pins @langchain/core: ^1.1.31 as its peer dep)
• @langchain/anthropic: 1.1.3 → 1.3.22 (compatible, no breaking changes)
• @langchain/google-genai: 2.1.10 → 2.1.24 (required — 2.1.10 had an exact peer dep on @langchain/core@1.1.15 which conflicted with 1.1.31)
• @langchain/google-vertexai: 2.1.10 → 2.1.24 (same reason as above)

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/AI-2182

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[codecov]

Bundle Report

Bundle size has no change ✅

Affected Assets, Files, and Routes:

view changes for bundle: editor-ui-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/worker-*.js	2.93MB	2.95MB	21924.59% ⚠️
assets/worker-*.js	-2.93MB	13.37kB	-99.55%

[cubic-dev-ai]

No issues found across 3 files

Architecture diagram

sequenceDiagram
    participant User as "User / Workflow"
    participant Node as "n8n AI Node (OpenAI Model)"
    participant Core as "@langchain/core (v1.1.31)"
    participant API as "LLM Endpoint (Anthropic/OpenAI)"

    Note over User,API: Message Flow with Tool Calling

    User->>Node: Execute Agent with Tool
    Node->>Core: formatMessages(history)
    
    Note over Core: CHANGED: convertToV1FromChatCompletions()
    
    Core->>Core: Inspect message blocks
    
    alt Content is empty ('') AND Tool Calls present
        Core->>Core: NEW: Strip empty text block
    else Content is non-empty
        Core->>Core: Preserve text block
    end
    
    Core-->>Node: Sanitized Message Object
    
    Node->>API: POST /chat/completions
    Note right of API: Payload now lacks empty 'content' strings
    
    alt Anthropic-compatible Backend
        API-->>Node: 200 OK (Success)
    else Legacy Behavior (pre-fix)
        Note right of API: Would return 400 Bad Request if content: ''
        API-->>Node: 400 Error
    end
    
    Node-->>User: Tool Output / Agent Response

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[n8n-assistant]

Got released with n8n@2.13.0