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Support for line range with file tagging? #2129
Description
Hello, recently started to use opencode, I like it a lot, thanks for all that hard work!
I've been trying to figure out if there is a way to append line ranges to file tagging in TUI. I've been trying to explore the codebase a bit and it seems the backend supports the concept of file range with the message attachment and the Read tool can thus read specific file-range, and apparently there's a way to pass it with the API. But as far as I can tell, it's not possible to trigger it through the TUI.
The use-case I had in mind is something similar to Cursor, where you can navigate in your editor, select a few lines of code, and use a plugin to attach the file tag with the lines to the opencode input prompt via the TUI API. Not sure how much of a tiny optimization that is compared to sending the entire file, but in my experience that was useful to give precise context to the agent and guide it.
In my tests I've noticed that the agent will usually naturally make the tool call to read the file if you do something like @filepath:10:20, but that's not the same as it requires the agent to make the decision to invoke the Read tool, and it's both less reliable and more expensive than just having opencode pro-actively inline that information before sending to the LLM.
Activity
github-actions commentedon Aug 21, 2025
This issue might be a duplicate of existing issues. Please check:
Feel free to ignore if none of these address your specific case.
quantonganh commentedon Oct 18, 2025
Have you tried something like this:
@filepath:L10-20?regb commentedon Oct 25, 2025
Thanks for the suggestion, unfortunately that doesn't work too. I tried multiple variations, but I don't think the TUI supports this syntax.
dennypenta commentedon Jan 15, 2026
I found a problem.
warning: I'm reading the codebase the first time ever.
I found the code responsible for line range
apparently web/desktop and tui have different line range syntax.
to perform it in TUI do
@filepath#12-42, where #12-42 is :L12-42 for web/desktop (I guess, never used them).proof it works is here, you can see my prompt and how it calls the read tool with offset and limit: https://opncd.ai/share/H0jN92x0
there are 3 possible things to fix:
@adamdotdevin wdyt?
rekram1-node commentedon Jan 15, 2026
yes those are all great ideas that we just havent gotten around to!
ewired commentedon Jan 22, 2026
@dennypenta Line range syntax in #4238 was originally
@somefile:12-42and changed to@somefile#12-42as this was the VS code extension's syntax at the time. Possibly they all need to be unified and that should be a separate issue, as the PR mentioning this is not relevant to what this original issue is asking IMO. This issue is asking about handling mentions in the TUI API again which could be solved by #3996.github-actions commentedon Mar 28, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.