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edit tool: show candidate lines with diff on oldText match failure #97032
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P3Low-priority cleanup, docs, polish, ergonomics, or speculative work.Low-priority cleanup, docs, polish, ergonomics, or speculative work.clawsweeper:fix-shape-clearClawSweeper found a clear likely implementation shape for this issue.ClawSweeper found a clear likely implementation shape for this issue.clawsweeper:queueable-fixClawSweeper marked this issue as an existing queue_fix_pr work candidate.ClawSweeper marked this issue as an existing queue_fix_pr work candidate.clawsweeper:source-reproClawSweeper found a high-confidence source-level issue reproduction.ClawSweeper found a high-confidence source-level issue reproduction.enhancementNew feature or requestNew feature or requestimpact:otherThis issue has meaningful maintainer-visible impact outside the owned taxonomy.This issue has meaningful maintainer-visible impact outside the owned taxonomy.issue-rating: 🦞 diamond lobsterVery strong issue quality with high-confidence source-level or clear reproduction.Very strong issue quality with high-confidence source-level or clear reproduction.no-staleExclude from stale automationExclude from stale automation
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P3Low-priority cleanup, docs, polish, ergonomics, or speculative work.Low-priority cleanup, docs, polish, ergonomics, or speculative work.clawsweeper:fix-shape-clearClawSweeper found a clear likely implementation shape for this issue.ClawSweeper found a clear likely implementation shape for this issue.clawsweeper:queueable-fixClawSweeper marked this issue as an existing queue_fix_pr work candidate.ClawSweeper marked this issue as an existing queue_fix_pr work candidate.clawsweeper:source-reproClawSweeper found a high-confidence source-level issue reproduction.ClawSweeper found a high-confidence source-level issue reproduction.enhancementNew feature or requestNew feature or requestimpact:otherThis issue has meaningful maintainer-visible impact outside the owned taxonomy.This issue has meaningful maintainer-visible impact outside the owned taxonomy.issue-rating: 🦞 diamond lobsterVery strong issue quality with high-confidence source-level or clear reproduction.Very strong issue quality with high-confidence source-level or clear reproduction.no-staleExclude from stale automationExclude from stale automation
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Summary
edit tool reports 'not found' without showing what went wrong
Problem to solve
edit tool 的 oldText 匹配失败时只返回 "Could not find the exact text"，不给任何诊断信息。用户不知道是转义写错了、缩进不对还是空白不匹配，只能盲猜。
Proposed solution
匹配失败时输出最多 3 个最近似候选行，包含行号、并排对比和差异标记：
Alternatives considered
无。当前行为是纯错误码，没有任何替代输出。
Impact
消除 edit tool 使用时的反复试错成本。2026-06-26 同一会话内出现 4 次此问题，每次失败原因不同但反馈相同。
Evidence/examples
No response
Additional information
No response