---
name: deep-research
description: Dig into a topic across sources and hand back the findings that actually matter, with citations. Use when a decision needs more than a quick search and you want the sources named.
---

# Deep Research

## What it does
Researches a question across multiple sources, weighs them, and returns a structured briefing with the findings that matter and the sources cited, so you can check the work.

## When to use
- A decision that needs evidence, not a hunch (a product, a standard, a material, a market).
- Any time you would otherwise open twenty tabs and lose the thread.

## Instructions
1. Restate the question and what a good answer would let the user decide.
2. Gather from multiple independent sources. Prefer primary sources and standards over blogs.
3. Return findings grouped by sub-question, each with a citation. Separate fact from your inference.
4. State what is uncertain or contested, and what would resolve it.

## Output format
A briefing: the question, findings by theme with inline citations, a short "what's uncertain" section, and a one-line bottom line.

## The one mistake to avoid
Presenting confident prose with no sources. If a claim matters, it carries a citation the user can open. Verify anything load-bearing before acting.

## Note
Claude's built-in web search and research modes do the heavy lifting here. For agentic, tool-using research patterns and the official skill format, see https://github.com/anthropics/skills.