{"target":"mcp:io.usefulapi/castle","resolved_target":"mcp:io.usefulapi/castle","message":"MCP Registry declaration recorded; observed daily by Lowdown Scanner since 2026-10-19; no tool definition change in 5 compared days; no agent-reported interactions.","registry":{"listed":true,"name":"io.usefulapi/castle","declared_version":"1.17.0","status":"active","removed_at":null,"remote_hosts":["castle.usefulapi.io"],"declares_packages":false,"first_recorded_at":"2026-10-19T06:19:52.681+00:00","recorded_since_baseline":true,"changes_30d":[{"on":"2026-10-24","kind":"version","old":"1.16.3","new":"1.17.0"},{"on":"2026-10-22","kind":"version","old":"1.11.1","new":"1.16.3"}],"note":"Recorded from Lowdown's first Registry snapshot (2026-10-19); first_recorded_at is not when the entry first appeared in the Registry."},"scanner":{"target":"mcp:io.usefulapi/castle","last_observed_at":"2026-10-24T01:26:29.115+00:00","observations_30d":6,"remotes_observed":1,"latest":{"reached_level":2,"http_status":200,"error_type":null,"latency_ms":390,"tool_count":14,"schema_hash":"e95e5682aed2a657","server_version":"1.19.0"},"schema_versions_30d":1,"status_distribution_30d":{"200":6},"in_sample":true,"cohorts":["2026-10-19-v2"],"first_observed_at":"2026-10-19T06:25:48.335+00:00","definition_changes":{"pattern":"no_change_observed","observed_days":6,"compared_days":5,"change_days":0,"first_compared_day":"2026-10-19","last_change":null,"days_since_last_change":null,"stable_days_before_last_change":null,"events":[{"day":"2026-10-24","kinds":["server_version_changed"],"server_version":{"from":"1.17.0","to":"1.19.0"},"returned_to_earlier_definition":false,"compared_with":"2026-10-23"},{"day":"2026-10-23","kinds":["server_version_changed"],"server_version":{"from":"1.16.3","to":"1.17.0"},"returned_to_earlier_definition":false,"compared_with":"2026-10-22"},{"day":"2026-10-21","kinds":["server_version_changed"],"server_version":{"from":"1.16.2","to":"1.16.3"},"returned_to_earlier_definition":false,"compared_with":"2026-10-20"},{"day":"2026-10-20","kinds":["server_version_changed"],"server_version":{"from":"1.14.0","to":"1.16.2"},"returned_to_earlier_definition":false,"compared_with":"2026-10-19"}],"note":"No change in tool schemas, descriptions or names across 5 compared days.","basis":"Each daily observation is compared with the previous one from the same remote URL, using hashes of tool schemas, descriptions and names. Description text is not returned. A change is a recorded fact, not a judgment about the server."},"daily_30d":[{"day":"2026-10-19","reached_level":2,"http_status":200,"error_type":null,"tool_count":14,"tools_changed":null,"retry_reached_level":null,"remotes":1},{"day":"2026-10-20","reached_level":2,"http_status":200,"error_type":null,"tool_count":14,"tools_changed":false,"retry_reached_level":null,"remotes":1},{"day":"2026-10-21","reached_level":2,"http_status":200,"error_type":null,"tool_count":14,"tools_changed":false,"retry_reached_level":null,"remotes":1},{"day":"2026-10-22","reached_level":2,"http_status":200,"error_type":null,"tool_count":14,"tools_changed":false,"retry_reached_level":null,"remotes":1},{"day":"2026-10-23","reached_level":2,"http_status":200,"error_type":null,"tool_count":14,"tools_changed":false,"retry_reached_level":null,"remotes":1},{"day":"2026-10-24","reached_level":2,"http_status":200,"error_type":null,"tool_count":14,"tools_changed":false,"retry_reached_level":null,"remotes":1}],"missing_days":[],"tools":{"names":["castle_archive_list_item","castle_count_list_items","castle_create_list","castle_create_list_item","castle_get_events_schema","castle_get_list","castle_get_list_item","castle_group_events","castle_search_events","castle_search_list_items","castle_search_lists","castle_unarchive_list_item","castle_update_list","castle_update_list_item"],"count":14,"partial":false,"set_first_observed_at":"2026-10-20T18:16:10.822+00:00","observed_at":"2026-10-24T01:26:29.115+00:00"},"declared_vs_observed":{"declared_version":"1.17.0","observed_server_version":"1.19.0","declared_hosts":["castle.usefulapi.io"],"observed_hosts":["castle.usefulapi.io"]},"method":{"requests":"POST initialize, then tools/list. No tool calls and no authentication.","vantage":"One network location (GitHub Actions). A timeout or refusal means not reachable from there, not necessarily from everywhere.","frequency":"Once per day, for a fixed sample of MCP Registry entries with a streamable-http remote.","limits":"Each row is a single probe at one moment. It is not a measure of availability or uptime, and not a score.","dataset":"https://github.com/PetShopBros/lowdown-data"},"note":"Observed by Lowdown Scanner (initialize + tools/list only; no tool calls). Not included in success_rate."},"interactions":0,"success_rate":null,"confidence":"none","source":{"name":"Lowdown","lookup":"https://lowdown-proxy.vercel.app/api/reputation/mcp:io.usefulapi/castle","dataset":"https://github.com/PetShopBros/lowdown-data","license":"CC BY 4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","license_applies_to":"registry and scanner blocks (MCP Registry records and Lowdown Scanner observations)","retrieved_at":"2026-10-25T01:25:11.341Z","cite":"Lowdown (https://github.com/PetShopBros/lowdown-data), retrieved 2026-10-25, CC BY 4.0"}}