Can the API Edit a Question, changing only one field?

Question

The documentation for the edit question method (/questions/{id}/edit) is somewhat vague.
Are all of the parameters required?

For example, if the only field I want to change in the question is tags, do I still have to provide title and body?

(It seems like I may have to, but that seems incredibly inefficient so I assume that I'm misunderstanding something?)

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Edit:

• When providing the body should it be with or without markdown, and safe or unsafe?

• Should I replace Escape Codes like \n/\r/\t with ASCII characters (10/13/9) before sending the body back with the edit? What about HTML Entity codes

An example of an issue is this:

"...End Sub \r\n\r\n\r\nShould..."

...becomes this:

"...End Sub \\r\\n\\r\\n\\r\\nShould..." 

...after passing through my process; I've tried several variations.

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Related Questions:

• How do I add newlines when editing a post body via the API?
• How to quickly retag a question from the API? (No answers)
• Should HTML or Markdown be passed to /questions/{id}/edit?

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I would have assumed there was a way to indicate "no changes to this field", with a zero length string or a specific symbol, to avoid issues like this; having to deal with markdown conversion and such, when all I want to do is add or remove a tag.

Answer 1

Yes, you must provide all three of: tags, title, and body -- even if they haven't changed.

Otherwise you will get error messages like:

"error_id": 400, "error_message": "tags", "error_name": "bad_parameter"

Or

"error_id": 400, "error_message": "title", "error_name": "bad_parameter"

Or

"error_id": 400, "error_message": "body", "error_name": "bad_parameter"

(Emphasis added)

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Note that I just edited the question, above, via the API.