# update_merchant_product Change SOME fields on a product already in a Merchant Center feed — the everyday operation, because price and availability move daily. This is a PATCH: only the attributes you name are touched and everything else on the product survives, which is the difference from upsert_merchant_product (a whole-row write that wipes anything you leave out). It refuses if the product does not exist rather than quietly creating a half-populated one, and it refuses an empty change rather than sending an update mask with nothing behind it. The reply reports every field Google now holds, so you can see what survived. Free. Agent View of the PolicyLayer registry record for `update_merchant_product`. HTML page: https://policylayer.com/tools/hermoso/update-merchant-product ## Facts - Tool: `update_merchant_product` - Server: Hermoso (`https://app.hermoso.ai/mcp`) — https://policylayer.com/tools/hermoso.md - Homepage: git+https://github.com/hermoso-ai/hermoso.git - Risk category: Write (Medium risk) - Registry record: grade D, identity unverified - Server auth posture: gated - Server CORS policy: * - Server rate-limited: no - Parameters: 0 - Recommended policy verdict: Rate-limited ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "update_merchant_product", "arguments": {} } } ``` ## Why update_merchant_product is rated Medium An AI agent can call update_merchant_product faster than any human can review: one bad instruction and it creates or modifies resources in Hermoso by the hundred, each call as confident as the last. Risk signals: Bulk/mass operation — affects multiple targets ## Use case AI agents use update_merchant_product to create or update resources in Hermoso, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Hermoso environment. ## Recommended policy (PolicyLayer) Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Hermoso: ```json { "version": "1", "default": "deny", "tools": { "update_merchant_product": { "limits": [ { "counter": "update_merchant_product_rate", "window": "minute", "max": 30, "scope": "grant" } ] } } } ``` ## Other tools on Hermoso (895) - `answer_google_business_question` — Destructive — https://policylayer.com/tools/hermoso/answer-google-business-question.md - `apple_ads_change_history` — Destructive — https://policylayer.com/tools/hermoso/apple-ads-change-history.md - `associate_linkedin_conversion_campaigns` — Destructive — https://policylayer.com/tools/hermoso/associate-linkedin-conversion-campaigns.md - `cancel_openai_ads_audience_operation` — Destructive — https://policylayer.com/tools/hermoso/cancel-openai-ads-audience-operation.md - `cancel_scheduled` — Destructive — https://policylayer.com/tools/hermoso/cancel-scheduled.md - `cancel_stripe_subscription` — Destructive — https://policylayer.com/tools/hermoso/cancel-stripe-subscription.md - `clear_sheet_range` — Destructive — https://policylayer.com/tools/hermoso/clear-sheet-range.md - `create_analytics_custom_dimension` — Destructive — https://policylayer.com/tools/hermoso/create-analytics-custom-dimension.md - `create_openai_ads_campaign` — Destructive — https://policylayer.com/tools/hermoso/create-openai-ads-campaign.md - `delete_analytics_key_event` — Destructive — https://policylayer.com/tools/hermoso/delete-analytics-key-event.md - `delete_apple_ads_object` — Destructive — https://policylayer.com/tools/hermoso/delete-apple-ads-object.md - `delete_bluesky_post` — Destructive — https://policylayer.com/tools/hermoso/delete-bluesky-post.md - `delete_brand` — Destructive — https://policylayer.com/tools/hermoso/delete-brand.md - `delete_creator` — Destructive — https://policylayer.com/tools/hermoso/delete-creator.md - `delete_dm_automation` — Destructive — https://policylayer.com/tools/hermoso/delete-dm-automation.md - `delete_drive_file` — Destructive — https://policylayer.com/tools/hermoso/delete-drive-file.md - `delete_google_ads_object` — Destructive — https://policylayer.com/tools/hermoso/delete-google-ads-object.md - `delete_google_business_post` — Destructive — https://policylayer.com/tools/hermoso/delete-google-business-post.md - `delete_instagram_dm_automation` — Destructive — https://policylayer.com/tools/hermoso/delete-instagram-dm-automation.md - `delete_linkedin_ads_object` — Destructive — https://policylayer.com/tools/hermoso/delete-linkedin-ads-object.md - `delete_linkedin_comment` — Destructive — https://policylayer.com/tools/hermoso/delete-linkedin-comment.md - `delete_linkedin_lead_subscription` — Destructive — https://policylayer.com/tools/hermoso/delete-linkedin-lead-subscription.md - `delete_merchant_data_source` — Destructive — https://policylayer.com/tools/hermoso/delete-merchant-data-source.md - `delete_merchant_product` — Destructive — https://policylayer.com/tools/hermoso/delete-merchant-product.md - `delete_messenger_marketing_campaign` — Destructive — https://policylayer.com/tools/hermoso/delete-messenger-marketing-campaign.md - `delete_meta_audience` — Destructive — https://policylayer.com/tools/hermoso/delete-meta-audience.md - `delete_meta_catalog` — Destructive — https://policylayer.com/tools/hermoso/delete-meta-catalog.md - `delete_meta_object` — Destructive — https://policylayer.com/tools/hermoso/delete-meta-object.md - `delete_microsoft_ads_object` — Destructive — https://policylayer.com/tools/hermoso/delete-microsoft-ads-object.md - `delete_microsoft_merchant_product` — Destructive — https://policylayer.com/tools/hermoso/delete-microsoft-merchant-product.md - …and 865 more: https://policylayer.com/tools/hermoso.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=hermoso · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/hermoso