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[FEATURE]: improve edit tool validation to use checksum of content in addition to timestamp #8668

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opened 2026-02-16 18:10:32 -05:00 by yindo · 4 comments
yindo commented 2026-02-16 18:10:32 -05:00
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Originally created by @k98kurz on GitHub (Feb 5, 2026).

Originally assigned to: @thdxr on GitHub.

Feature hasn't been suggested before.

  • I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

With the edit tool, if a file has been written since the last read, even if the content of the file has not been changed, opencode requires that the agent re-read the file before being able to edit it. The obvious goal is to prevent an agent from blindly editing files that it has not read or in ways that are inconsistent with the current state of the file, but if the file content has not changed, then it is a false positive that just burns tokens needlessly.

If we add a checksum, whether sha256 for maximum collision resistance or crc32 for potentially faster computation (and 56 fewer hex chars per file in the session), we can reduce the false positive rate substantially and prevent a lot of token burn and context exhaustion.

Originally created by @k98kurz on GitHub (Feb 5, 2026). Originally assigned to: @thdxr on GitHub. ### Feature hasn't been suggested before. - [x] I have verified this feature I'm about to request hasn't been suggested before. ### Describe the enhancement you want to request With the edit tool, if a file has been written since the last read, even if the content of the file has not been changed, opencode requires that the agent re-read the file before being able to edit it. The obvious goal is to prevent an agent from blindly editing files that it has not read or in ways that are inconsistent with the current state of the file, but if the file content has not changed, then it is a false positive that just burns tokens needlessly. If we add a checksum, whether sha256 for maximum collision resistance or crc32 for potentially faster computation (and 56 fewer hex chars per file in the session), we can reduce the false positive rate substantially and prevent a lot of token burn and context exhaustion.
yindo added the discussion label 2026-02-16 18:10:32 -05:00
yindo commented 2026-02-16 18:10:32 -05:00
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@github-actions[bot] commented on GitHub (Feb 5, 2026):

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

  • #12402: Error: You must read file before overwriting it - also addresses the validation requirement for write operations

Both issues relate to the read/write tool validation workflow. Feel free to ignore if this doesn't address your specific case.

@github-actions[bot] commented on GitHub (Feb 5, 2026): This issue might be a duplicate of existing issues. Please check: - #12402: Error: You must read file before overwriting it - also addresses the validation requirement for write operations Both issues relate to the read/write tool validation workflow. Feel free to ignore if this doesn't address your specific case.
yindo commented 2026-02-16 18:10:32 -05:00
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@k98kurz commented on GitHub (Feb 5, 2026):

Looks like it would just take a modification of the FileTime.

@k98kurz commented on GitHub (Feb 5, 2026): Looks like it would just take a modification of the [FileTime](https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/file/time.ts).
yindo commented 2026-02-16 18:10:32 -05:00
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@mohamedbouddi7777-dev commented on GitHub (Feb 6, 2026):

i dont have tim help

@mohamedbouddi7777-dev commented on GitHub (Feb 6, 2026): i dont have tim help
yindo commented 2026-02-16 18:10:32 -05:00
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@mohamedbouddi7777-dev commented on GitHub (Feb 6, 2026):

في الجمعة، ٦ فبراير ٢٠٢٦، ٠٣:٥٠ Jon Tyler @.***> كتب:

k98kurz left a comment (anomalyco/opencode#12406)
https://github.com/anomalyco/opencode/issues/12406#issuecomment-3857637824

Looks like it would just take a modification of the FileTime
https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/file/time.ts
.

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@mohamedbouddi7777-dev commented on GitHub (Feb 6, 2026): في الجمعة، ٦ فبراير ٢٠٢٦، ٠٣:٥٠ Jon Tyler ***@***.***> كتب: > *k98kurz* left a comment (anomalyco/opencode#12406) > <https://github.com/anomalyco/opencode/issues/12406#issuecomment-3857637824> > > Looks like it would just take a modification of the FileTime > <https://github.com/anomalyco/opencode/blob/dev/packages/opencode/src/file/time.ts> > . > > — > Reply to this email directly, view it on GitHub > <https://github.com/anomalyco/opencode/issues/12406#issuecomment-3857637824>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/B2DFN3Q6W7EHQ35PQASF4PD4KP6RBAVCNFSM6AAAAACUFSAMO6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTQNJXGYZTOOBSGQ> > . > You are receiving this because you are subscribed to this thread.Message > ID: ***@***.***> >
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Reference: anomalyco/opencode#8668
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