{"record":{"id":"5802c69c3f989f3f","repo":"gastownhall/beads","slug":"failed-to-update-beads-section-in-s-w","errorCode":null,"errorMessage":"failed to update beads section in %s: %w","messagePattern":"failed to update beads section in (.+?): %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/bd/init_agent.go","lineNumber":94,"sourceCode":"\t// File exists - check if it already has our sections\n\tcontentStr := string(content)\n\thasBeads := strings.Contains(contentStr, \"BEGIN BEADS INTEGRATION\")\n\n\tif hasBeads {\n\t\t// Preserve existing full profile when minimal is requested (avoid information loss)\n\t\teffectiveProfile := profile\n\t\texistingMeta := agents.ParseMarker(contentStr[strings.Index(contentStr, \"<!-- BEGIN BEADS INTEGRATION\"):])\n\t\tif existingMeta != nil && existingMeta.Profile == agents.ProfileFull && profile == agents.ProfileMinimal {\n\t\t\teffectiveProfile = agents.ProfileFull\n\t\t\tif verbose {\n\t\t\t\tfmt.Printf(\"  ℹ %s already has full profile; preserving (higher-information) content\\n\", filename)\n\t\t\t}\n\t\t}\n\n\t\t// Update existing section to latest versioned format (upgrades legacy markers)\n\t\tupdated, changed, replaceErr := agents.ReplaceSectionWithOpts(contentStr, effectiveProfile, opts)\n\t\tif replaceErr != nil {\n\t\t\treturn fmt.Errorf(\"failed to update beads section in %s: %w\", filename, replaceErr)\n\t\t}\n\t\tif changed {\n\t\t\t// #nosec G306 - markdown needs to be readable\n\t\t\tif err := os.WriteFile(filename, []byte(updated), 0644); err != nil {\n\t\t\t\treturn fmt.Errorf(\"failed to update %s: %w\", filename, err)\n\t\t\t}\n\t\t\tif verbose {\n\t\t\t\tfmt.Printf(\"  %s Updated beads section in %s to latest format\\n\", ui.RenderPass(\"✓\"), filename)\n\t\t\t}\n\t\t} else if verbose {\n\t\t\tfmt.Printf(\"  %s already has current agent instructions\\n\", filename)\n\t\t}\n\t\treturn nil\n\t}\n\n\t// Append beads section with profile metadata\n\tnewContent := contentStr\n\tif !strings.HasSuffix(newContent, \"\\n\") {","sourceCodeStart":76,"sourceCodeEnd":112,"githubUrl":"https://github.com/gastownhall/beads/blob/71377f276968b452ee607177637970a4ff888584/cmd/bd/init_agent.go#L76-L112","documentation":"For an existing agent file, updateAgentFile calls agents.ReplaceSectionWithOpts to rewrite the BEGIN/END BEADS INTEGRATION section into the current versioned format. A failure inside the section replacement logic (marker parsing/rewrite) is wrapped here with the target filename. This is a logic/parse failure, not a filesystem error — the beads markers are malformed or the replacement options are inconsistent.","triggerScenarios":"addAgentsInstructions upgrading a legacy or hand-edited beads section in AGENTS.md where ReplaceSectionWithOpts cannot parse or replace the section (e.g. BEGIN marker without matching END, or corrupted markers).","commonSituations":"Older beads versions with legacy markers; users manually editing inside the managed block and deleting an END marker; conflicting profile options passed via opts.","solutions":["Manually repair the BEGIN/END BEADS INTEGRATION markers in the file (both must be present and intact)","Delete the broken beads section and re-run bd init to regenerate a fresh current section","Restore the file from git before re-running the update","Upgrade bd so legacy markers are handled by the current ReplaceSectionWithOpts version"],"exampleFix":"// before: truncated markers in AGENTS.md\n<!-- BEGIN BEADS INTEGRATION -->\n... (END marker missing)\n// after\n$ git checkout -- AGENTS.md\n$ bd init  # regenerates the section in latest format","handlingStrategy":"try-catch","validationCode":"grep -c 'BEGIN BEADS INTEGRATION' AGENTS.md | grep -q 1 && grep -q 'END BEADS INTEGRATION' AGENTS.md && echo ok || echo 'malformed beads section'","typeGuard":null,"tryCatchPattern":"if err := addAgentsInstructions(...); err != nil && strings.Contains(err.Error(), \"failed to update beads section\") { /* repair markers or restore file from git, re-run init */ }","preventionTips":["Never hand-edit inside the BEGIN/END BEADS INTEGRATION block","Keep both markers intact when editing the surrounding file","Restore managed files from git before re-running init upgrades","Keep bd up to date so legacy marker upgrades are supported"],"tags":["agents","markdown","section-replace","init"],"backgroundTag":"malformed-managed-section","analyzedSha":"71377f276968b452ee607177637970a4ff888584","analyzedAt":"2026-08-30T18:55:39.744Z","schemaVersion":2},"datasetVersion":"2026-08-30T23:17:21.991Z"}