Open in…

The Open in… group is the heart of the plugin: a submenu that opens the current page in your chosen LLM chat, using the most reliable strategy each provider supports today.

The plugin ships with sixteen built-in providers. Five are enabled by default; the rest are off by default and opt-in.

Default-on providers

Provider	Strategy	Notes
ChatGPT	`url-prompt`	`chatgpt.com/?q=` prefill
Claude	`clipboard-open`	Copies prompt, opens `claude.ai/new`
Gemini	`clipboard-open`	Copies prompt, opens `gemini.google.com/app`
GitHub Copilot	`url-prompt`	`github.com/copilot?prompt=` prefill
Perplexity	`url-prompt`	`perplexity.ai/?q=` prefill

For the full catalog (including Cursor, T3 Chat, DeepSeek, DuckDuckGo AI Chat, Grok, HuggingChat, Kagi, Mistral, Phind, You.com, and Google AI Studio), see Configuration: Providers.

For an explanation of each strategy and why the per-provider choice was made, see Concepts: per-provider strategies.

Default behavior

With no configuration, the five default-on providers are enabled and the submenu is labelled Open in….

starlightLlmActions()

Disable the entire submenu

starlightLlmActions({
  actions: {
    openIn: false,
  },
})

The submenu disappears from the dropdown. The other actions (Copy, View, PDF) still work.

Disable a single provider

Pass an object instead of a boolean and override individual providers:

starlightLlmActions({
  actions: {
    openIn: {
      providers: {
        copilot: false,
        gemini: false,
      },
    },
  },
})

Opt in to default-off providers

Default-off providers (Cursor, T3 Chat, Kagi, Grok, etc.) require an explicit true (or an override object) to appear in the submenu:

starlightLlmActions({
  actions: {
    openIn: {
      providers: {
        cursor: true,
        t3chat: true,
        kagi: true,
      },
    },
  },
})

Customise a provider

Each provider accepts a full ProviderOverride:

starlightLlmActions({
  actions: {
    openIn: {
      providers: {
        chatgpt: {
          label: 'ChatGPT (work account)',
          prompt: 'Summarise the linked Acme docs page: {url}',
        },
        cursor: {
          // Passing an override object also opts a default-off provider in.
          maxBytes: 4000, // tighter cap than the 8 KB default
          fallbackStrategy: 'clipboard-open',
        },
      },
    },
  },
})

See Configuration: Providers for the full per-provider matrix and all overridable fields.

Customise the prompt

The same prompt is used for every provider that doesn’t override it. To change the global prompt:

starlightLlmActions({
  prompt: 'Read this Acme docs page and answer in plain English: {md_url}',
})

{md_url} is substituted with the absolute URL of the current page’s .md route (clean markdown). Use {url} for the rendered HTML URL instead. For inline-content providers, you can use {prompt_with_markdown} in the URL template to also include the page body.

Rename the submenu

starlightLlmActions({
  actions: {
    openIn: {
      label: 'Ask an LLM',
    },
  },
})