# RubyGems API: Get a Ruby gem's details

> Looks up a Ruby gem on RubyGems by name or gem page link and returns its latest version, release date, description, downloads, authors, license, links and runtime dependencies.

Unofficial. Not affiliated with or endorsed by RubyGems.

- Page: https://fous.com/methods/rubygems.org/get-gem
- Method: `rubygems.org/get_gem`, version 1
- Website: rubygems.org
- Returns: name, latest version, release date, description, downloads, authors, license, links, runtime dependencies
- Effect: read (it gets data and changes nothing)
- Sign-in: none needed
- Cost: 1 credit per completed run (1¢ with pay as you go); failed runs are free
- Verified: Nov 2, 2026

## Inputs

| Field | Type | Required | In the run below | Description |
|---|---|---|---|---|
| `gem` | string | yes | `"rails"` | Gem name or RubyGems gem page link, such as rails or https://rubygems.org/gems/rails. |

## Output

From a run on Oct 23, 2026, shortened. Its input:

```json
{
  "gem": "rails"
}
```

Its output:

```json
{
  "name": "rails",
  "authors": [
    "David Heinemeier Hansson"
  ],
  "license": "MIT",
  "description": "Ruby on Rails is a full-stack web framework optimized for programmer happiness and sustainable productivity. It encourages beautiful code by favoring convention over configuration.",
  "release_date": "2026-09-24",
  "homepage_link": "https://rubyonrails.org",
  "rubygems_link": "https://rubygems.org/gems/rails",
  "latest_version": "8.1.4",
  "total_downloads": 805383766,
  "source_code_link": "https://github.com/rails/rails/tree/v8.1.4",
  "runtime_dependencies": [
    {
      "name": "actioncable",
      "version_requirement": "= 8.1.4"
    },
    {
      "name": "actionmailbox",
      "version_requirement": "= 8.1.4"
    },
    {
      "name": "actionmailer",
      "version_requirement": "= 8.1.4"
    }
  ],
  "latest_version_downloads": 2547555
}
```

## Run it

From code, with a Fous API key in `FOUS_API_KEY`; the answer's `data` holds the output:

```bash
curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"method":"rubygems.org/get_gem","input":{"gem":"rails"}}'
```

From an AI agent connected to the Fous MCP server: its `run` with the same method and input. To connect one, give it `set up https://fous.com/SKILL.md`.

## Ask your agent

- What's the latest version of the rails gem and when was it released?
- Show me the license, authors and runtime dependencies for nokogiri
- Look up the devise gem on RubyGems and give me its description and download count
- I need details on the sidekiq gem, including its links and dependencies
- Check the https://rubygems.org/gems/puma page and tell me its latest version and total downloads

## Input schema

```json
{
  "type": "object",
  "required": [
    "gem"
  ],
  "properties": {
    "gem": {
      "type": "string",
      "description": "Gem name or RubyGems gem page link, such as rails or https://rubygems.org/gems/rails."
    }
  }
}
```

## Output schema

```json
{
  "type": "object",
  "required": [
    "name",
    "latest_version",
    "release_date",
    "description",
    "total_downloads",
    "latest_version_downloads",
    "authors",
    "license",
    "homepage_link",
    "source_code_link",
    "runtime_dependencies",
    "rubygems_link"
  ],
  "properties": {
    "name": {
      "type": "string",
      "description": "Gem name."
    },
    "authors": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Gem authors."
    },
    "license": {
      "type": [
        "string",
        "null"
      ],
      "description": "Declared license or licenses."
    },
    "description": {
      "type": [
        "string",
        "null"
      ],
      "description": "Gem summary."
    },
    "release_date": {
      "type": [
        "string",
        "null"
      ],
      "format": "date",
      "description": "Release date of the latest version, YYYY-MM-DD."
    },
    "homepage_link": {
      "type": [
        "string",
        "null"
      ],
      "description": "Project homepage link."
    },
    "rubygems_link": {
      "type": "string",
      "description": "RubyGems gem page link."
    },
    "latest_version": {
      "type": "string",
      "description": "Latest version."
    },
    "total_downloads": {
      "type": "integer",
      "description": "Downloads across all versions."
    },
    "source_code_link": {
      "type": [
        "string",
        "null"
      ],
      "description": "Source code link."
    },
    "runtime_dependencies": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "name",
          "version_requirement"
        ],
        "properties": {
          "name": {
            "type": "string"
          },
          "version_requirement": {
            "type": "string"
          }
        }
      },
      "description": "Runtime dependencies and version requirements."
    },
    "latest_version_downloads": {
      "type": "integer",
      "description": "Downloads for the latest version."
    }
  }
}
```

## See more

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- [npm API: Get package](https://fous.com/methods/npmjs.com/get-package.md): Looks up a public npm package by name or npm link. Returns its latest version, weekly downloads, maintainers, links, dates and version count.
- [PyPI API: Get package](https://fous.com/methods/pypi.org/get-package.md): Gets a PyPI package's current version, release date, metadata, project links and its 10 most recently published versions from a package name or PyPI link.
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- [Discogs API: Get release](https://fous.com/methods/discogs.com/get-release.md): Finds a Discogs release by title, artist or release link and returns its edition details, tracks, community counts, current price and sold price statistics.