dataset-first-looklisted

The first ten minutes with a new dataset decide whether the analysis is worth anything, and they are the minutes most often skipped. This skill runs a fixed first pass over whatever you can give it: a header and a few rows pasted into chat, a table copied from a spreadsheet, or a file attached to the conversation. One profile in one shape, so two datasets compare and a second look diffs against the first. It needs only what you paste or attach, so it runs the same on claude.ai, in Claude Code, and in Claude Cowork, where [/first-look](/commands/analytics/first-look) runs it over a file on disk and saves the result. ## When to use this skill - An extract arrived from another team and nobody can tell you what is in it. - You are about to query an unfamiliar table and want the traps listed first. - A number came out wrong and you suspect the source data rather than the logic. - You need a written record of the dataset's condition to attach to an analysis. > [!NOTE] > This skill reasons over what you show it. It does not run code, connect to a warehouse, or compute statistics across rows it cannot see. Anthropic's data plugin ships an `explore-data` skill that profiles by executing against a connected source; use that when you have the connection. Use this one when you have a sample, no execution environment, and want the same report shape every time. ## Instructions 1. **Say what you inspected, first and plainly.** One line naming the input and its limits: "23 pasted rows o