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bufio.Scanner: token too long #3502

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bufio.Scanner: token too long#3502
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bugSomething isn't working

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@yudgnahk
yudgnahk
opened on Oct 28, 2025

Description

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I got this issue. The opencode is quite lagging. And the response can't be displayed properly. But the agent is still running.

OpenCode version

0.15.19

Steps to reproduce

  1. I have a plan folder with 10 phases and 10 checklists.
  2. At the end of each message, I ask to update the checklist.
  3. And I opened just one session for 4 phases, and I'm in phase 5.

I think it's because the I/O buffer is over range. Then it causes the lagging.

Screenshot and/or share link

Image

Operating System

macOS 15.7.1

Terminal

iTerm2

Activity

  1. yudgnahk
    added
    bugSomething isn't working
    on Oct 28, 2025
  2. yudgnahk
    changed the title [-]Buffer is too long error.[/-] [+]bufio.Scanner: token too long[/+] on Oct 28, 2025

  3. github-actions commented on Oct 28, 2025

    @github-actions
    github-actionsBot
    on Oct 28, 2025 – with GitHub Actions
    Contributor

    This issue might be a duplicate of existing issues. Please check:

    • bufio.Scanner: token too long #3409: Both report the same "bufio.Scanner: token too long" error, with OpenCode becoming unresponsive and getting stuck on "Generating" or having display issues. The underlying problem appears to be the same - the bufio.Scanner hitting limits when processing large amounts of data/tokens.

    Feel free to ignore if none of these address your specific case.

  4. rekram1-node commented on Oct 28, 2025

    @rekram1-node
    rekram1-node
    on Oct 28, 2025
    Collaborator

    closing as duplicate of #3409, I will try to figure this bug out today

  5. rekram1-node
    closed this as a duplicateof bufio.Scanner: token too long #3409 on Oct 28, 2025
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