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To understand the range of possible suggestions generated by Copilot, I would like to know the detailed technical description on which data exactly is send to Copilot. The features list on https://github.com/features/copilot only explain a very vague definition of the data being sent:

Prompts

A Prompt is the contextual information the GitHub Copilot extension sends when a user is working on a file and pauses typing, or when the user opens the Copilot pane. Copilot for Business Prompts are only transmitted in real-time. Copilot for Business does not retain Prompts.

However, it doesn't specify what is send exactly.

The Privacy Statement on https://docs.github.com/en/site-policy/privacy-policies/github-copilot-for-business-privacy-statement explain vaguely again, that "Code Snippets" are send to Copilot:

Code Snippets Data

GitHub Copilot transmits snippets of your code from your IDE to GitHub to provide Suggestions to you. Code snippets data is only transmitted in real-time to return Suggestions, and is discarded once a Suggestion is returned. Copilot for Business does not retain any Code Snippets Data.

Again, no exact definition of "Code snippets" that is being send to Copilot.

The official documentation for "Enabling or diabling duplication detection" on https://docs.github.com/en/copilot/configuring-github-copilot/configuring-github-copilot-settings-on-githubcom#enabling-or-disabling-duplication-detection say that "about 150 characters" around the current location is checked:

GitHub Copilot includes a filter which detects code suggestions matching public code on GitHub. You can choose to enable or disable the filter. When the filter is enabled, GitHub Copilot checks code suggestions with their surrounding code of about 150 characters against public code on GitHub. If there is a match or near match, the suggestion will not be shown to you.

But this might only be used for this specific case of finding duplicate code against public github repositories.

So the question is: What exact data is send to Copilot to generate suggestions?

• Is always the full current document send to Copilot? Is there a limit, how many lines/characters are send, specially for larger source code files? If so, what are these limits?
• Are code segments from other open and/or recent tabs send to Copilot? If so, what exact content is send and how many open/recent tabs are checked?
• What other specific information for generating the suggestion is send to Copilot? Is the content of the clipboard being used?
• Is some kind of "Session" system being used, that while coding the current "Session" in Copilot is being used which keep a context of the data previously send? Or is every request to Copilot always fresh?
• Is the data send to Copilot different for "individual" or "business" subscriptions?

It looks like neither the official documentation on https://docs.github.com/en/copilot nor the feature list on https://github.com/features/copilot specifically explain what exact data is send to Copilot. Usage experience suggest, that some content from other open tabs are send, but I'm not sure about that. Or it has some other ways to "remember" what code was previously seen or used.