@-mentions

Reference

• @file — a specific file. Type @ then a path; fuzzy-matched against the workspace.
• @folder:src/api — every file in a folder, attached and summarized.
• @symbol:functionName — a function, class, or type by name, with its definition and nearby references.
• @codebase:your query — semantic search over the codebase index; the top matching chunks are attached.
• @docs:your query — the Markdown in your workspace whose path matches.
• @web https://… or @web your query — fetch a URL or run a web search and ground on the result.
• @git — attach the current working-tree diff (vs HEAD) and a per-file change summary.

Mentions stack. “@file checkout.ts @git why did the total change?” attaches the file and the diff together. Bare @path works as a shorthand for @file.