{"generated_at":"2026-10-14T20:07:22+00:00","item":{"added_at":"2026-07-21","analysis_method":"independent_manual_review_2026-10-10","assessment_status":"provisional","auth_posture":"auth_required","category":"Interactive Connector","confidence":"medium","description":"Fastmail connects Claude to email, calendars, contacts, and notes. Search records, draft messages, manage events, and organize information. Supported records can also be updated or deleted.","did":"3a2788fb-9861-4234-b1a3-c929c3a4d4f9","documentation_url":"https://www.fastmail.help/hc/en-us/articles/15869557281295-Connecting-AI-tools-via-Fastmail-s-MCP-server","editorial_description":{"extended_description":"The inventory also includes attachments and deletion of messages, events, contacts, and notes. The listed email operation drafts messages; direct email sending is not established.","schema_version":1,"summary":"Fastmail connects Claude to email, calendars, contacts, and notes.\nSearch records, draft messages, manage events, and organize information.\nSupported records can also be updated or deleted."},"homepage_url":"","icon":"","id":"3a2788fb-9861-4234-b1a3-c929c3a4d4f9","installs":0,"last_scanned":"","license":"","long_description":"The inventory also includes attachments and deletion of messages, events, contacts, and notes. The listed email operation drafts messages; direct email sending is not established.","manual_assessment":"high","manual_review":{"all_findings":[{"evidence":"The complete inventory explicitly exposes deletion across core personal-information resources.","reasoning":"These actions can irreversibly remove communications, calendar and contact data.","risk_type":"data_deletion","severity":"high","title":"Deletes email, contacts, events and notes","triggering_tools_or_skills":["delete_contact","delete_email","delete_event","delete_note"]},{"evidence":"The connector operates against the real Fastmail calendar and includes event composition/creation and RSVP actions.","reasoning":"These can send invitations or attendance responses to other people as the user.","risk_type":"messaging_as_user","severity":"high","title":"Creates events and sends RSVP responses","triggering_tools_or_skills":["create_event","compose_event","rsvp_event"]}],"assessment_status":"provisional","auth_and_scopes":"Authentication grants real Fastmail email, calendar, contacts, notes and attachment access; exact role/identity scope is not documented in the packet.","blocked_missing_evidence":null,"confidence":"medium","displayed_risk":"high","evidence_completeness":"complete","manual_overall_risk":"high","official_sources":[{"accessed_at":"2026-10-10T20:24:37Z","url_or_path":"plutosecurity/plutonium@b749c8dc43536c794409be9805edd48063f045e2:app/data/conn/claudesec/3a2788fb-9861-4234-b1a3-c929c3a4d4f9.json","what_it_proves":"Candidate PR #125 record identity (name \"Fastmail\", publisher, type interactive_connector) and 29 stored tool names; no tool descriptions stored"},{"accessed_at":"2026-09-22T10:46:07Z","url_or_path":"https://api.anthropic.com/api/directory/servers?verified_tier=anthropic,partner,community (snapshot claude-directory-all-tiers-2026-09-22.json)","what_it_proves":"Official Claude Directory listing https://claude.ai/directory/3a2788fb-9861-4234-b1a3-c929c3a4d4f9: complete tool_names inventory (29 tools), remote streamable-http endpoint https://api.fastmail.com/mcp, auth_posture auth_required, directory tier partner"}],"primary_reason":"Fastmail can delete core account data and perform calendar communication actions.","provisional_risk":null,"publication_recommendation":"accept","requires_runtime_verification":true,"review_key":"claude:3a2788fb-9861-4234-b1a3-c929c3a4d4f9","reviewed_at":"2026-10-10","reviewer_notes":"No send_email tool is declared; draft_email only creates a draft. Mail, attachments and calendar text are high prompt-injection exposure.","risk_domains":{"arbitrary_network_access":"false","authz_ambiguity":"true","browser_control":"false","credential_or_admin_actions":"false","deletes_data":"true","deployment_or_infrastructure":"false","dynamic_hidden_actions":"false","filesystem_or_repo_access":"false","forwards_data_to_third_party":"true","modifies_data":"true","persistent_credentials":"true","prompt_injection_exposure":"true","provenance_uncertainty":"true","reads_private_data":"true","runs_code_or_queries":"false","sends_messages_as_user":"true","spends_or_moves_money":"false"},"tools_or_skills_reviewed":29,"tools_or_skills_total":29},"name":"Fastmail","needs_runtime_verification":true,"plutonium_url":"https://plutonium.pluto.security/detail.html?planet=claudesec&did=3a2788fb-9861-4234-b1a3-c929c3a4d4f9&utm_source=plutonium_analysis_skill&utm_medium=claude_skill&utm_campaign=connector_risk_assessment","privacy_policy_url":"https://www.fastmail.com/policies/privacy/","provisional_risk":null,"publication_recommendation":"accept","publisher":"Fastmail","publisher_url":"https://fastmail.com/","remote_url":"https://api.fastmail.com/mcp","repository_url":"","risk":"high","risk_severity":"high","security_risks":[{"description":"This connector can permanently remove data or resources. Review findings: These actions can irreversibly remove communications, calendar and contact data.","evidence":"Deletes email, contacts, events and notes: The complete inventory explicitly exposes deletion across core personal-information resources.","manual_risk_type":"data_deletion","remediation":{"block_tool_categories":["destructive"],"steps":["Disable destructive tools unless deletion is an explicit workflow requirement.","Require human confirmation and verified backups before deletion."]},"risk_type":"deletes_data","severity":"high","title":"Deletes email, contacts, events and notes","triggering_tools":["delete_contact","delete_email","delete_event","delete_note"]},{"description":"This connector can publish or send messages and content using the connected identity. Review findings: These can send invitations or attendance responses to other people as the user.","evidence":"Creates events and sends RSVP responses: The connector operates against the real Fastmail calendar and includes event composition/creation and RSVP actions.","manual_risk_type":"messaging_as_user","remediation":{"block_tool_categories":["sends_externally"],"steps":["Require review before messages, posts, or publications are sent.","Restrict delivery to test or internal recipients where possible."]},"risk_type":"sends_messages_as_you","severity":"high","title":"Creates events and sends RSVP responses","triggering_tools":["create_event","compose_event","rsvp_event"]}],"signature_status":"unknown","source_code_reviewed":false,"support_url":"support@fastmail.com","tags":["accesses_calendar","deletes_data","interactive_connector","network_access","oauth_required","sends_messages_as_you"],"tools":[{"description":"","name":"add_to_note"},{"description":"","name":"archive_email"},{"description":"","name":"compose_event","risk":{"category":"sends_externally","level":"high","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can publish or send messages and content using the connected identity. Review findings: These can send invitations or attendance responses to other people as the user."}},{"description":"","name":"create_contact"},{"description":"","name":"create_event","risk":{"category":"sends_externally","level":"high","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can publish or send messages and content using the connected identity. Review findings: These can send invitations or attendance responses to other people as the user."}},{"description":"","name":"create_note"},{"description":"","name":"delete_contact","risk":{"category":"destructive","level":"high","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can permanently remove data or resources. Review findings: These actions can irreversibly remove communications, calendar and contact data."}},{"description":"","name":"delete_email","risk":{"category":"destructive","level":"high","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can permanently remove data or resources. Review findings: These actions can irreversibly remove communications, calendar and contact data."}},{"description":"","name":"delete_event","risk":{"category":"destructive","level":"high","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can permanently remove data or resources. Review findings: These actions can irreversibly remove communications, calendar and contact data."}},{"description":"","name":"delete_note","risk":{"category":"destructive","level":"high","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can permanently remove data or resources. Review findings: These actions can irreversibly remove communications, calendar and contact data."}},{"description":"","name":"draft_email"},{"description":"","name":"list_calendars"},{"description":"","name":"list_folders"},{"description":"","name":"list_identities"},{"description":"","name":"read_email"},{"description":"","name":"read_note"},{"description":"","name":"read_thread"},{"description":"","name":"rsvp_event","risk":{"category":"sends_externally","level":"high","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can publish or send messages and content using the connected identity. Review findings: These can send invitations or attendance responses to other people as the user."}},{"description":"","name":"search_contacts"},{"description":"","name":"search_email"},{"description":"","name":"search_events"},{"description":"","name":"search_notes"},{"description":"","name":"search_org_contacts"},{"description":"","name":"set_memo"},{"description":"","name":"update_contact"},{"description":"","name":"update_email"},{"description":"","name":"update_event"},{"description":"","name":"update_note"},{"description":"","name":"upload_attachment"}],"tools_count":29,"transport":"streamable-http","type":"interactive_connector","url":"https://claude.ai/directory/3a2788fb-9861-4234-b1a3-c929c3a4d4f9","uuid":"95d48ce9-4086-55df-bfdb-301990e033e3","verification_tier":"partner","version":""},"query_key":"fastmail fastmail","schema_version":1,"status":"match"}