Test MCP implementation with different LLMs and improve accordingly

[esgn]

Context

This is a task we will repeat at different stages

• Some models will not have access to MCP resources
• Some small models will struggle with complex behavior
• Some environments implement only part of the MCP standard or with specifics
• MCP tools description must be tested with different models and different environments

Therefore we must test and improve accordingly.

Actions

Currently in ignfab/geocontext-test :

• Allow the creation of a langgraph agent for test purpose
• Create the first tests relying on the agent
• Integrate either in geocontext (facing issues with corporate proxy) or demo-geocontext (refactoring required)

Models

• anthropic:claude-haiku-4-5
• anthropic:claude-sonnet-4-6
• google_genai:gemini-2.5-flash
• google_genai:gemini-3.1-flash-lite-preview
• ollama:qwen3.5:9b ?
• ... TO BE COMPLETED

Linked issues

• study different models to find a better/cheaper one demo-geocontext#49