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CodeTracked since May 19, 2026

Serena may overwrite externally edited files due to stale open-file cache

Issue #1013 identified a correctness bug where Serena reused a cached file buffer in `open_file()` without checking disk freshness, so `replace_content` could apply regex edits to stale content and silently overwrite newer external changes.

oraios/serenaopen_fileopen_file_buffersreplace_content

What Happened

  • Issue #1013 identified a correctness bug where Serena reused a cached file buffer in `open_file()` without checking disk freshness, so `replace_content` could apply regex edits to stale content and silently overwrite newer external changes.
  • Issue #1013 identified a correctness bug where Serena reused a cached file buffer in `open_file()` without checking disk freshness, so `replace_content` could apply regex edits to stale content and silently overwrite newer external changes.
  • 1 evidence item attached for review.

What is Different

Before

Scattered source updates, isolated context, and manual follow-up across multiple feeds.

Now

The change request defines a concrete fix for stale-buffer safety: before returning a cached buffer, compare it with current on-disk state (mtime or content hash), invalidate cached buffers when changed, and force a fresh read for edit operations.

Why Track This

Why It Matters

Developers using Serena alongside other tools (for example Claude Code Edit/Read and git workflows) can see real code changes disappear without warning, because an edit tool may report success while persisting stale content over newer file versions; teams should monitor multi-tool sessions for silent overwrite behavior and verify that future releases add explicit stale-buffer detection for all write paths. After the fix, operations like `replace_content` should only write against fresh file content, reducing risk of accidental data loss and making mixed-workflow editing safer.

Impact

Developers using Serena alongside other tools (for example Claude Code Edit/Read and git workflows) can see real code changes disappear without warning, because an edit tool may report success while persisting stale content over newer file versions; teams should monitor multi-tool sessions for silent overwrite behavior and verify that future releases add explicit stale-buffer detection for all write paths. After the fix, operations like `replace_content` should only write against fresh file content, reducing risk of accidental data loss and making mixed-workflow editing safer.

What To Watch Next

  • Watch whether oraios/serena becomes a repeated pattern.
  • Track follow-up changes around Tool Calling.
  • Compare future signals against this evidence trail.
  • Re-check risk flags: stale_buffer_reuse_without_mtime_check, silent_overwrite_without_conflict_warning.
Open Topic TimelineOpen Technical EventOpen Original Sourcestale_buffer_reuse_without_mtime_check / silent_overwrite_without_conflict_warning / edit_paths_may_bypass_cache_refresh

Supporting Evidence

GITHUB ISSUEHigh Trust

oraios/serena Issue #1013: replace_content uses stale file buffer, silently overwrites disk changes

A stale cache reuse path in `open_file()` let `replace_content` write back old content and erase 388 lines added externally, with no error returned.