DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
The WebSearch tool now includes improved guidance for handling date-sensitive queries. When searching for the latest documentation or time-sensitive content, the tool will now properly account for the current date provided in the environment context.
Example: If the environment indicates "Today's date: 2025-07-01" and you request "the latest docs", the search will use 2025 in the query instead of defaulting to 2024.