{"generated_at":"2026-10-14T20:07:22+00:00","item":{"added_at":"2026-09-08","analysis_method":"independent_manual_review_2026-10-10","assessment_status":"provisional","auth_posture":"auth_required","catalog_reconciliation":{"basis":"Documented actions on the identified catalog surface; not an execution test.","confidence":"high","evidence_completeness":"partial","previous":{"confidence":"low","detail_sha256":"5d60f94a49bfbe0809f31db029fd40d96e957eb11b0edef22eccb9592b105dc0","risk":"high"},"proposal_file":"claude-tail-proposals.json","rationale":"Vendor MCP article: at sign-in user chooses read-only or read-and-write; read-and-write lets the assistant create, update and delete journal entries, bulk-upload adjustments, post close adjustments, and approve/decline/reopen close tasks. Every write returns an approval request first. Modifying/deleting general-ledger entries is financially consequential, so High is evidenced; approval gate mitigates but does not remove it. The visible 'ERP write-back' card is inaccurate for the MCP route: the doc says ERP access via the assistant is read-only; writes land in Nominal.","review_key":"claudesec:dfb3539e-4df3-45e2-9146-4474c2bd484f","reviewed_at":"2026-10-12","runtime_verified":false,"sources":["https://support.nominal.so/articles/1361002688-connecting-nominal-to-your-ai-assistant-mcp","https://support.nominal.so/","https://api.anthropic.com/api/directory/servers?verified_tier=anthropic,partner,community"],"status":"resolved"},"category":"Interactive Connector","confidence":"low","description":"Explore financial-close work and results in Nominal. Review reconciliations, matching, intercompany activity, and variance findings across entities or currencies. Access follows tenant permissions; ERP write-back requires human approval.","did":"dfb3539e-4df3-45e2-9146-4474c2bd484f","documentation_url":"https://support.nominal.so/","editorial_description":{"extended_description":"Nominal works with a transaction-level general-ledger mirror and defaults to read-only work. Discover available tools or workflows, inspect subsidiaries, manage attachment uploads, and request approval for supported actions.","schema_version":1,"summary":"Explore financial-close work and results in Nominal.\nReview reconciliations, matching, intercompany activity, and variance findings across entities or currencies.\nAccess follows tenant permissions; ERP write-back requires human approval."},"homepage_url":"","icon":"","id":"dfb3539e-4df3-45e2-9146-4474c2bd484f","installs":0,"last_scanned":"","license":"","long_description":"Nominal works with a transaction-level general-ledger mirror and defaults to read-only work. Discover available tools or workflows, inspect subsidiaries, manage attachment uploads, and request approval for supported actions.","manual_assessment":"unassessed","manual_review":{"all_findings":[{"evidence":"The description covers reconciliation, journal automation and ERP write-back, while only wrapper tools are declared.","reasoning":"Journal entries, attachments and approvals may have High financial/accounting impact but cannot be mapped to schemas.","risk_type":"generic_gateway","severity":"medium","title":"Generic call_tool invokes an undisclosed finance workflow action set","triggering_tools_or_skills":["search_tools","call_tool","search_workflows"]},{"evidence":"The product statement explicitly says writes are possible after approval.","reasoning":"The action is verified but its exact financial scope is not.","risk_type":"data_modification","severity":"medium","title":"ERP write-back can occur after human approval","triggering_tools_or_skills":["request_approval","call_tool"]},{"evidence":"Private finance and uploaded data is processed.","reasoning":"It should remain untrusted.","risk_type":"prompt_injection_exposure","severity":"low","title":"GL transactions and attachment content enter model context","triggering_tools_or_skills":["call_tool","confirm_attachment_upload"]},{"evidence":"The connector runs at https://api.nominal.so/mcp without a pinned server implementation in the packet.","reasoning":"The implementation can change independently, so runtime verification and change monitoring remain necessary.","risk_type":"provenance_uncertainty","severity":"low","title":"Nominal is a mutable hosted service","triggering_tools_or_skills":[]}],"assessment_status":"provisional","auth_and_scopes":"OAuth scopes subsidiaries and finance workflows to the tenant; ERP write-back requires human approval, but the concrete tool/action inventory is missing.","blocked_missing_evidence":"A complete search_tools result/tool schema inventory, exact ERP write-back actions, approval binding, journal/payment boundaries and deletion/admin capabilities.","confidence":"low","displayed_risk":"high","evidence_completeness":"insufficient","manual_overall_risk":"unassessed","official_sources":[{"accessed_at":"2026-10-10T20:24:37Z","url_or_path":"plutosecurity/plutonium@b749c8dc43536c794409be9805edd48063f045e2:app/data/conn/claudesec/dfb3539e-4df3-45e2-9146-4474c2bd484f.json","what_it_proves":"Candidate PR #125 record identity (name \"Nominal\", publisher, type interactive_connector) and 8 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/dfb3539e-4df3-45e2-9146-4474c2bd484f: complete tool_names inventory (8 tools), remote streamable-http endpoint https://api.nominal.so/mcp, auth_posture auth_required, directory tier community"}],"primary_reason":"Nominal hides financially consequential close/ERP actions behind a generic tool gateway.","provisional_risk":"high","publication_recommendation":"fix","requires_runtime_verification":true,"review_key":"claude:dfb3539e-4df3-45e2-9146-4474c2bd484f","reviewed_at":"2026-10-10","reviewer_notes":"Reviewed all 8 wrapper tools. Human approval does not make an undisclosed action set assessable.","risk_domains":{"arbitrary_network_access":"false","authz_ambiguity":"true","browser_control":"false","credential_or_admin_actions":"unknown","deletes_data":"unknown","deployment_or_infrastructure":"unknown","dynamic_hidden_actions":"true","filesystem_or_repo_access":"false","forwards_data_to_third_party":"true","modifies_data":"unknown","persistent_credentials":"true","prompt_injection_exposure":"true","provenance_uncertainty":"true","reads_private_data":"true","runs_code_or_queries":"unknown","sends_messages_as_user":"unknown","spends_or_moves_money":"unknown"},"tools_or_skills_reviewed":8,"tools_or_skills_total":8},"name":"Nominal","needs_runtime_verification":true,"plutonium_url":"https://plutonium.pluto.security/detail.html?planet=claudesec&did=dfb3539e-4df3-45e2-9146-4474c2bd484f&utm_source=plutonium_analysis_skill&utm_medium=claude_skill&utm_campaign=connector_risk_assessment","privacy_policy_url":"https://nominal.so/legal/privacy-policy/","provisional_risk":"high","publication_recommendation":"fix","publisher":"Nominal ERP Inc","publisher_url":"https://nominal.so/","remote_url":"https://api.nominal.so/mcp","repository_url":"","risk":"high","risk_severity":"high","security_risks":[{"description":"With read-and-write access, the assistant can create or update journal entries, post adjustments and approve, decline or reopen close tasks in Nominal. Writes first require an approval request.","evidence":"Actions: call_tool, request_approval. https://support.nominal.so/articles/1361002688-connecting-nominal-to-your-ai-assistant-mcp — Adjustments and journal entries; Month-end close; Permissions and safety","risk_type":"modifies_data","severity":"high","title":"Changes general-ledger and close records"},{"description":"Read-and-write access includes deleting Nominal journal entries, with an approval request before the write.","evidence":"Actions: call_tool, request_approval. https://support.nominal.so/articles/1361002688-connecting-nominal-to-your-ai-assistant-mcp — Adjustments and journal entries; Month-end close; Permissions and safety","risk_type":"deletes_data","severity":"high","title":"Deletes journal entries after approval"},{"description":"Retrieves financial reports, general-ledger information, bank transactions and read-only ERP objects within your permissions.","evidence":"Actions: call_tool, search_tools, list_tenants, list_subsidiaries. https://support.nominal.so/articles/1361002688-connecting-nominal-to-your-ai-assistant-mcp — Reporting; Data that lives only in your ERP (read only)","risk_type":"reads_private_data","severity":"medium","title":"Reads private financial and ERP information"},{"description":"Uploads attachments and lead sheets used in bank and reconciliation workflows.","evidence":"Actions: request_attachment_upload, confirm_attachment_upload. https://support.nominal.so/articles/1361002688-connecting-nominal-to-your-ai-assistant-mcp — Bank and reconciliation","risk_type":"modifies_data","severity":"medium","title":"Uploads financial attachments"}],"signature_status":"unknown","source_code_reviewed":false,"support_url":"support@nominal.so","tags":["modifies_data","deletes_data","reads_private_data"],"tools":[{"description":"","name":"call_tool","risk":{"category":"state_change","level":"medium","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can create, update, configure, or otherwise change connected resources. Review findings: The action is verified but its exact financial scope is not."}},{"description":"","name":"confirm_attachment_upload"},{"description":"","name":"list_subsidiaries"},{"description":"","name":"list_tenants"},{"description":"","name":"request_approval","risk":{"category":"state_change","level":"medium","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can create, update, configure, or otherwise change connected resources. Review findings: The action is verified but its exact financial scope is not."}},{"description":"","name":"request_attachment_upload"},{"description":"","name":"search_tools","risk":{"category":"code_execution","level":"medium","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can execute code, commands, queries, or dynamically selected actions. Review findings: Journal entries, attachments and approvals may have High financial/accounting impact but cannot be mapped to schemas."}},{"description":"","name":"search_workflows","risk":{"category":"code_execution","level":"medium","recommendation":"Follow the connector-level remediation and require approval for consequential actions.","why":"This connector can execute code, commands, queries, or dynamically selected actions. Review findings: Journal entries, attachments and approvals may have High financial/accounting impact but cannot be mapped to schemas."}}],"tools_count":8,"transport":"streamable-http","type":"interactive_connector","url":"https://claude.ai/directory/dfb3539e-4df3-45e2-9146-4474c2bd484f","uuid":"4d4c9a3f-b75a-59ea-8176-6955aea8935a","verification_tier":"community","version":""},"query_key":"nominal","schema_version":1,"status":"match"}