{"record":{"id":"923fa60bd0377ae2","repo":"googleapis/mcp-toolbox","slug":"tool-type-q-already-registered-923fa6","errorCode":null,"errorMessage":"tool type %q already registered","messagePattern":"tool type %q already registered","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/tools/postgres/postgreslistlocks/postgreslistlocks.go","lineNumber":55,"sourceCode":"        string_agg(locked.transactionid::text,':') as trxid,\n        string_agg(locked.lockinfo,'||') as locks\n    FROM\n        (SELECT\n          a.pid,\n          a.usename,\n          a.query,\n          l.transactionid,\n          (l.granted::text||','||coalesce(l.relation::regclass,0)::text||','||l.mode::text)::text as lockinfo\n        FROM\n          pg_stat_activity a\n          JOIN pg_locks l ON l.pid = a.pid  AND a.pid != pg_backend_pid()) as locked\n    GROUP BY\n        locked.pid, locked.usename, locked.query;\n`\n\nfunc init() {\n\tif !tools.Register(resourceType, newConfig) {\n\t\tpanic(fmt.Sprintf(\"tool type %q already registered\", resourceType))\n\t}\n}\n\nfunc newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {\n\tactual := Config{ConfigBase: tools.ConfigBase{Name: name}}\n\tif err := decoder.DecodeContext(ctx, &actual); err != nil {\n\t\treturn nil, err\n\t}\n\treturn actual, nil\n}\n\ntype compatibleSource interface {\n\tPostgresPool() *pgxpool.Pool\n\tRunSQL(context.Context, string, []any) (any, error)\n}\n\ntype Config struct {\n\ttools.ConfigBase `yaml:\",inline\"`","sourceCodeStart":37,"sourceCodeEnd":73,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/tools/postgres/postgreslistlocks/postgreslistlocks.go#L37-L73","documentation":"The package's init() registers the 'postgres-list-locks' tool type in the global registry and panics if tools.Register returns false, meaning the type string was already claimed. This is a duplicate-registration guard for programming errors (e.g. a vendored or duplicated package copy linked into the binary), not a user config issue.","triggerScenarios":"Thrown at internal/tools/postgres/postgreslistlocks/postgreslistlocks.go:55 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Ensure the package is not imported twice under different paths (e.g. vendored and module copies)","Rename the conflicting resourceType constant if two distinct tools share it","Clean go.mod/go.sum and rebuild to eliminate stale duplicate dependencies"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"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"}