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GleanMark USPTO Trademark Search
com.gleanmark/trademark-search in the official MCP registry.
Endpoint https://gleanmark.com/mcp.
The registry describes it as: USPTO trademark data: 14M+ marks, owners, Office Actions, TTAB cases. Public tools need no account.
We read its 64 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
analyze_prosecution_history analyze_ttab_proceeding check_brand_availability check_domain_availability compare_marks count_filings_by_period count_trademarks_by_attributes fetch get_chain_of_title get_class_relationships get_cohort_event_intervals get_correspondent_marks get_correspondent_specialization get_deadline_satisfaction_mapping get_event_code_reference get_event_status_mapping get_fame_profile get_firm_correspondent_tasks get_firm_deadlines get_firm_oa_outcomes get_firm_top_correspondents get_latest_office_action get_mark_ai_summary get_mark_deadlines get_mark_international_profile get_mark_owner_landscape get_mark_prosecution_summary get_nice_classes get_owner_ai_summary get_owner_deadlines get_owner_filing_trends get_owner_goods_keywords get_owner_related_parties get_owner_ttab_enforcement get_owner_ttab_stats get_prosecution_document get_prosecution_timeline get_reference_lookup get_similar_marks get_top_filers get_ttab_document get_ttab_proceeding_details get_ttab_top_opposition_filers is_mark_famous list_prosecution_documents lookup_trademark phonetic_search recommend_nice_classes research_office_action resolve_trademark_subject run_knockout_search run_safe_analytics search search_attorneys search_by_owner search_claimed_colors search_design_codes search_goods_services search_mark_statements search_trademarks and 4 more
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[](https://lazaretto.dev/mcp-registry/com-gleanmark-trademark-search)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.