Description

GoogleLLM.generateResponse() received the tools parameter but never passed it to the Gemini API. This caused graph memory operations to silently fail — zero entities
extracted, Neo4j stays empty, no error thrown. Users think everything is working because vector store writes succeed.

Root cause

The generateContent call in google.ts ignored the tools parameter entirely. When Gemini doesn't receive function declarations, it returns plain text instead of function call
responses, so toolCalls is always undefined.

Fix

• Convert OpenAI-style tools ({type: "function", function: {name, description, parameters}}) to Gemini's functionDeclarations format
• Pass them via config.tools to generateContent
• Parse completion.functionCalls into the standard toolCalls response format ({name, arguments})
• Consistent with how OpenAI, Ollama, Azure, Mistral, and Langchain LLMs handle tools in this codebase

Changes

• mem0-ts/src/oss/src/llms/google.ts — tool conversion + response parsing
• mem0-ts/src/oss/tests/google-llm.test.ts — 5 new tests

Fixes #4380

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Unit Test

5 tests covering:

• Text response without tools (backward compat)
• Tools forwarded as functionDeclarations to Gemini
• Text fallback when tools provided but model returns text
• Markdown code fence stripping preserved
• Multiple function calls in single response

Run with: cd mem0-ts && npx jest src/oss/tests/google-llm.test.ts

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes GoogleLLM.generateResponse ignores tools parameter — graph memory silently produces no entities with Google/Gemini provider #4380