X Search

The XSearch capability gives your agent search over X (Twitter) posts. It’s a provider-adaptive tool backed by XSearchTool on the native side — see X Search Tool for configuration options.

Unlike Web Search and Web Fetch, there is no default non-xAI fallback: X search is only available natively on xAI models. If your agent is not running on an xAI model, set fallback_model explicitly to an xAI model that supports XSearchTool, and search requests are delegated to that model as a subagent tool:

x_search.py

from pydantic_ai import Agent
from pydantic_ai.capabilities import XSearch

agent = Agent(
    'anthropic:claude-sonnet-4-6',
    capabilities=[XSearch(fallback_model='xai:grok-4.3')],
)