{"record":{"id":"17e7e7a34bd20cde","repo":"can1357/oh-my-pi","slug":"stop-edits-to-path-have-been-a-byte-identical","errorCode":null,"errorMessage":"STOP. Edits to ${path} have been a byte-identical no-op ${count} times in a row — the patch body matches the file at the targeted lines and the soft hint did not break the cycle. Cease re-issuing this payload. Either the intended change is already on disk (move on), or your anchor is wrong (re-read the file with `read` to observe the current line numbers and tag, then author a different edit). This exact payload will keep being rejected until it changes.","messagePattern":"STOP\\. Edits to (.+?) have been a byte-identical no-op (.+?) times in a row — the patch body matches the file at the targeted lines and the soft hint did not break the cycle\\. Cease re-issuing this payload\\. Either the intended change is already on disk \\(move on\\), or your anchor is wrong \\(re-read the file with `read` to observe the current line numbers and tag, then author a different edit\\)\\. This exact payload will keep being rejected until it changes\\.","errorType":"exception","errorClass":"ToolError","httpStatus":null,"severity":"error","filePath":"packages/coding-agent/src/edit/hashline/execute.ts","lineNumber":239,"sourceCode":"\n\t// Named registers persist across edit calls; the anonymous register is\n\t// batch-local. Each batch starts without anonymous state and publishes\n\t// named registers only after writes land.\n\tconst sessionClipboard = getEditClipboard(options.session);\n\tconst clipboard = startClipboardBatch(sessionClipboard);\n\n\t// Single-section fast path: prepare, commit, render.\n\tconst inputHash = hashPatchInput(options.input);\n\tif (patch.sections.length === 1) {\n\t\tfs.setBatchRequest(narrowBatchRequest(options.batchRequest, true));\n\t\tconst prepared = await patcher.prepare(patch.sections[0], clipboard);\n\t\tconst sectionResult = await patcher.commit(prepared);\n\t\tawait observeAppliedSection(options.onApplied, prepared, sectionResult);\n\t\tcommitClipboard(clipboard, sessionClipboard);\n\t\tif (sectionResult.op === \"noop\") {\n\t\t\tconst { count, escalate } = recordNoopEdit(options.session, sectionResult.canonicalPath, inputHash);\n\t\t\tif (escalate) {\n\t\t\t\tthrow new ToolError(noChangeLoopDiagnostic(sectionResult.path, count));\n\t\t\t}\n\t\t\treturn renderSection(sectionResult, undefined, prepared.section.path).toolResult;\n\t\t}\n\t\tresetNoopEdit(options.session, sectionResult.canonicalPath);\n\t\treturn renderSection(sectionResult, fs.consumeDiagnostics(sectionResult.path), prepared.section.path).toolResult;\n\t}\n\n\t// Multi-section: prepare every section up front so we fail fast before\n\t// any write hits the filesystem. One batch-local register spans the batch,\n\t// so `CUT` in one section feeds a register-backed `PUT` in a later one.\n\tconst prepared: PreparedSection[] = [];\n\t// Register state after each section's prepare. Commits are non-atomic: a\n\t// mid-batch write failure leaves earlier sections on disk, so the session\n\t// register must reflect exactly the landed prefix — content a landed CUT\n\t// deleted would otherwise be lost.\n\tconst sectionStates: Clipboard[] = [];\n\tfor (const section of patch.sections) {\n\t\tprepared.push(await patcher.prepare(section, clipboard));","sourceCodeStart":221,"sourceCodeEnd":257,"githubUrl":"https://github.com/can1357/oh-my-pi/blob/969062200754ea02cfac922e5ebb8c608c079e15/packages/coding-agent/src/edit/hashline/execute.ts#L221-L257","documentation":"The edit tool tracks consecutive byte-identical no-op edits per file+payload hash. When the same patch is re-applied N times and each commit reports op === 'noop' (the body already matches the file at the targeted lines), recordNoopEdit escalates and this ToolError is thrown telling the model to stop re-sending the payload, distinguishing 'change already applied' from 'wrong anchor'.","triggerScenarios":"Re-issuing an identical edit after it already succeeded (ops now match existing content), repeatedly targeting lines whose content already equals the replacement, or retrying the same input after a soft no-op hint without changing anything.","commonSituations":"Agents retrying a 'failed-looking' edit that actually succeeded; fuzzy matches where the intended change is semantically already present; stale model context claiming old content that was already replaced.","solutions":["Stop resending the same payload — verify the intended change with the read tool first.","If the change is genuinely missing, re-read to get fresh line numbers and tags, then author a DIFFERENT edit (changed old/new text or anchor).","If the change is already on disk, move on to the next task step."],"exampleFix":"// before (identical retry, already applied)\n@@@ src/a.ts:1a2b\n- fixed line\n+ fixed line\n// after (re-read, then real edit)\n// read src/a.ts -> fresh tag e5f6, see line moved\n@@@ src/a.ts:e5f6\n- old unchanged line\n+ actually new content","handlingStrategy":"retry","validationCode":"// before re-issuing an edit, verify the change is not already applied\nconst live = await Bun.file(absPath).text();\nif (live.includes(newText)) return { skipped: true, reason: 'change already present' };","typeGuard":null,"tryCatchPattern":"try {\n  return await executeHashlineSingle(options);\n} catch (e) {\n  if (e instanceof ToolError && e.message.includes('byte-identical no-op')) {\n    // do NOT retry the same payload; re-read and confirm or author a different edit\n    const fresh = await readForTag(path);\n    return planNewEditFromLiveContent(fresh);\n  }\n  throw e;\n}","preventionTips":["Never resend an identical edit payload after a no-op response.","Read the file after each successful edit to refresh anchors and confirm state.","Treat a first no-op hint as a signal to verify on-disk state before retrying."],"tags":["hashline","infinite-loop","noop-edit","edit-tool","agent-guardrail"],"backgroundTag":"no-op-edit-loop","analyzedSha":"969062200754ea02cfac922e5ebb8c608c079e15","analyzedAt":"2026-08-31T10:29:35.737Z","schemaVersion":2},"datasetVersion":"2026-08-31T14:17:45.589Z"}