> ## Documentation Index
> Fetch the complete documentation index at: https://docs.r28.ai/charter/llms.txt
> Use this file to discover all available pages before exploring further.

# research_papers_search

> Search the research paper index with natural-language queries.

<div className="tool-route"><span className="tool-row-method" data-method="GET">GET</span><code>{"https://api.firecrawl.dev/v2/search/research/papers"}</code></div>

```python firecrawl_research_papers_search.py theme={null}
from charter.packs import firecrawl

result = await firecrawl.research_papers_search.ainvoke({"query": ...})
```

## Query parameters

<div className="reference-table">
  | Field                                                         | Type      | Description                                                                                                                                 |
  | ------------------------------------------------------------- | --------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
  | `query` <span className="required" title="required">\*</span> | `string`  | Natural-language paper search query. <span className="field-constraints">min length 1</span>                                                |
  | `k`                                                           | `integer` | Maximum number of ranked papers to return. The server applies 40 when this is absent. <span className="field-constraints">≥ 1; ≤ 500</span> |
  | `authors`                                                     | `string`  | Author substring filter. Repeat or pass a comma-separated value.                                                                            |
  | `categories`                                                  | `string`  | Paper category filter. Repeat or pass a comma-separated value.                                                                              |
  | `to`                                                          | `string`  | Inclusive upper bound on created/updated date.                                                                                              |
</div>

## Body

<div className="reference-table">
  | Field  | Type     | Description                                    |
  | ------ | -------- | ---------------------------------------------- |
  | `from` | `string` | Inclusive lower bound on created/updated date. |
</div>