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Error: You must read file before overwriting it. Use the Read tool first #8664

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opened 2026-02-16 18:10:31 -05:00 by yindo · 1 comment
yindo commented 2026-02-16 18:10:31 -05:00
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Originally created by @travka on GitHub (Feb 5, 2026).

Originally assigned to: @thdxr on GitHub.

Description

The agent encountered a validation error when attempting to write to a file without reading it first.

Error Message

Error: You must read file before overwriting it. Use the Read tool first

Context

This error occurs in the file-writing safety protocol of the OpenCode agent. While the protocol is intended to prevent accidental overwrites, it can sometimes be too restrictive when the agent is explicitly tasked with creating a new file or when the context is already sufficiently clear.

Suggested Improvement

Consider if there are scenarios where this restriction can be relaxed, or provide a clearer path for the agent to bypass this check when it's certain about the operation (e.g., creating a new file).

Specifically, a new environment variable OPENCODE_DISABLE_FILETIME_CHECK should be available to allow users/agents to bypass this specific "read before write" check when necessary.

Originally created by @travka on GitHub (Feb 5, 2026). Originally assigned to: @thdxr on GitHub. ## Description The agent encountered a validation error when attempting to write to a file without reading it first. ## Error Message `Error: You must read file before overwriting it. Use the Read tool first` ## Context This error occurs in the file-writing safety protocol of the OpenCode agent. While the protocol is intended to prevent accidental overwrites, it can sometimes be too restrictive when the agent is explicitly tasked with creating a new file or when the context is already sufficiently clear. ## Suggested Improvement Consider if there are scenarios where this restriction can be relaxed, or provide a clearer path for the agent to bypass this check when it's certain about the operation (e.g., creating a new file). Specifically, a new environment variable `OPENCODE_DISABLE_FILETIME_CHECK` should be available to allow users/agents to bypass this specific "read before write" check when necessary.
yindo commented 2026-02-16 18:10:31 -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:

  • #4406: Why must the read tool be executed before the edit tool

This is a long-standing question about the requirement to read files before writing/editing. The current issue #12402 appears to be describing the same restriction but from the perspective of the Write tool validation error. Consider reviewing that discussion for context and any decisions made regarding this design pattern.

Feel free to ignore if your specific case is different.

@github-actions[bot] commented on GitHub (Feb 5, 2026): This issue might be a duplicate of existing issues. Please check: - #4406: Why must the read tool be executed before the edit tool This is a long-standing question about the requirement to read files before writing/editing. The current issue #12402 appears to be describing the same restriction but from the perspective of the Write tool validation error. Consider reviewing that discussion for context and any decisions made regarding this design pattern. Feel free to ignore if your specific case is different.
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Reference: anomalyco/opencode#8664
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