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Spur
com.usespur/spur in the official MCP registry.
Endpoint https://mcp.usespur.com/mcp.
The registry describes it as: Real estate leads, skip tracing, direct mail, SMS & email outreach, and marketing automations
We read its 87 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
spur_search_properties spur_parse_search_query spur_get_property spur_save_properties spur_list_saved_properties spur_get_property_stats spur_find_owners spur_get_owner spur_enrich spur_list_property_lists spur_create_property_list spur_add_properties_to_list spur_draft_message spur_list_workflows spur_get_workflow spur_create_workflow spur_set_workflow_step_template spur_set_workflow_active spur_enroll_owners_in_workflow spur_send_sms spur_list_sms_conversations spur_get_sms_conversation spur_get_outreach_report spur_list_message_templates spur_get_message_template spur_preview_message_template spur_preview_message_draft spur_create_email_template spur_update_email_template spur_create_sms_template spur_update_sms_template spur_delete_message_template spur_send_test_email spur_list_postcard_templates spur_get_postcard_template spur_preview_postcard_template spur_create_postcard_template spur_update_postcard_template spur_add_postcard_qr_code spur_remove_postcard_qr_code spur_delete_postcard_template spur_list_return_addresses spur_preview_postcard_campaign spur_send_postcards spur_list_qr_codes spur_create_qr_code spur_update_qr_code spur_delete_qr_code spur_get_qr_code_activity spur_list_images spur_save_image spur_upload_image spur_save_uploaded_image spur_delete_image spur_list_letter_templates spur_get_letter_template spur_preview_letter_template spur_create_letter_template spur_update_letter_template spur_delete_letter_template and 27 more
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[](https://lazaretto.dev/mcp-registry/com-usespur-spur)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.
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