{"record":{"id":"92ca2d1fc74d2895","repo":"googleapis/mcp-toolbox","slug":"unable-to-initialize-reloaded-configs-w","errorCode":null,"errorMessage":"unable to initialize reloaded configs: %w","messagePattern":"unable to initialize reloaded configs: %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"cmd/root.go","lineNumber":175,"sourceCode":") {\n\tlogger, err := util.LoggerFromContext(ctx)\n\tif err != nil {\n\t\tpanic(err)\n\t}\n\n\tinstrumentation, err := util.InstrumentationFromContext(ctx)\n\tif err != nil {\n\t\tpanic(err)\n\t}\n\n\tlogger.DebugContext(ctx, \"Attempting to parse and validate reloaded config.\")\n\n\tctx, span := instrumentation.Tracer.Start(ctx, \"toolbox/server/reload\")\n\tdefer span.End()\n\n\tsourcesMap, authServicesMap, embeddingModelsMap, toolsMap, promptsMap, groupsMap, err := server.InitializeConfigs(ctx, cfg)\n\tif err != nil {\n\t\terrMsg := fmt.Errorf(\"unable to initialize reloaded configs: %w\", err)\n\t\tlogger.WarnContext(ctx, errMsg.Error())\n\t\treturn nil, nil, nil, nil, nil, nil, err\n\t}\n\n\treturn sourcesMap, authServicesMap, embeddingModelsMap, toolsMap, promptsMap, groupsMap, nil\n}\n\n// Helper to check if a file has a newer ModTime than stored in the map\nfunc checkModTime(path string, mTime time.Time, lastSeen map[string]time.Time) bool {\n\tif mTime.After(lastSeen[path]) {\n\t\tlastSeen[path] = mTime\n\t\treturn true\n\t}\n\treturn false\n}\n\n// Helper to scan watched files and check their modification times in polling system\nfunc scanWatchedFiles(watchingFolder bool, folderToWatch string, watchedFiles map[string]bool, lastSeen map[string]time.Time) (map[string]bool, bool, error) {","sourceCodeStart":157,"sourceCodeEnd":193,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/cmd/root.go#L157-L193","documentation":"`validateReloadEdits` throws \"unable to initialize reloaded configs: %w\" when `server.InitializeConfigs(ctx, cfg)` fails while trying to materialize a reloaded configuration into all primitive maps (sources, auth services, embedding models, tools, prompts, groups). Unlike the offline path, `InitializeConfigs` performs full initialization including connecting to sources, so connection failures surface here. The caller (`handleDynamicReload`) downgrades this to a warning and keeps the old config serving.","triggerScenarios":"A watched config file change triggers reload and `InitializeConfigs` fails — e.g. the database described in a source is unreachable, credentials are wrong, a tool's SQL statement fails to prepare, or the new YAML is structurally invalid.","commonSituations":"Database credentials rotated without updating the config; network/VPN down when the reload fires; a new tool added with invalid SQL or a missing source reference; DNS or firewall changes breaking source connectivity during reload.","solutions":["Read the wrapped error in the logs — `InitializeConfigs` reports which source/tool failed and why","Fix the config (or the underlying connectivity/credentials) and save the file again to re-trigger the watcher","Test the new config standalone with `toolbox serve --config-file <new>` before hot-reloading it","Check network access to all sources (DB ports, IAM endpoints) if errors mention connection timeouts","Verify required environment variables are present in the server's process environment"],"exampleFix":"// before: source points at rotated credentials\n// kind: postgres\n// host: db.example.com\n//   password: ${OLD_PW}\n// after: update env the server process can see, then re-save config to re-trigger reload\n//   password: ${NEW_PW}","handlingStrategy":"try-catch","validationCode":"// Smoke-check source connectivity before triggering a reload\nimport \"database/sql\"\nfunc sourceReachable(dsn string) error {\n\tdb, err := sql.Open(\"pgx\", dsn)\n\tif err != nil { return err }\n\tdefer db.Close()\n\treturn db.Ping()\n}","typeGuard":null,"tryCatchPattern":"sourcesMap, ..., err := server.InitializeConfigs(ctx, cfg)\nif err != nil {\n\tlogger.WarnContext(ctx, fmt.Sprintf(\"reloaded config rejected, serving previous config: %v\", err))\n\treturn nil, nil, nil, nil, nil, nil, err\n}","preventionTips":["Test new configs in a separate `toolbox serve` instance before hot-reloading","Ensure DB credentials/network access are valid at reload time (not just at startup)","Stage config changes atomically (temp file + rename) so watchers never read partial YAML","Keep source env vars current in the server's process; rotated secrets require config+env updates together"],"tags":["go","hot-reload","config","initialization","server"],"backgroundTag":"config-reload-initialization-failed","analyzedSha":"8cc6e09de2ad7b8bffc77751799585a1401a48eb","analyzedAt":"2026-09-05T01:10:36.887Z","contentChangedAt":"2026-09-05T01:10:36.887Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}