upsert_material
Create or update a product material. Supports nesting via parent_id. Omit
This record as markdown: /tools/webcake-storefront/upsert-material.md
What upsert_material does on Webcake Storefront
AI agents use upsert_material to create or update resources in Webcake Storefront, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Webcake Storefront environment.
Why upsert_material is rated Medium
The tool performs write operations (upsert = create or update) on product materials within a storefront builder. This is reversible (materials can be deleted or modified again), so it is categorized as Write rather than Destructive. The severity is medium because misuse could corrupt product catalog data, but the blast radius is limited to material definitions within the storefront.
From the tool's definition Tool name 'upsert_material' combined with description 'Create or update a product material' explicitly indicates reversible creation and modification operations.
Attacks that exploit this kind of access
The rule that runs upsert_material safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Webcake Storefront, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For upsert_material, this is the rule to start with:
upsert_material stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Webcake Storefront, apply this rule, and every upsert_material call is checked against it from then on.
Questions about upsert_material
Create or update a product material. Supports nesting via parent_id. Omit. It is categorised as a Write tool in the Webcake Storefront MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Webcake Storefront MCP server in PolicyLayer and add a rule for upsert_material: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Webcake Storefront. Nothing to install.
upsert_material is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the upsert_material rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for upsert_material. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
upsert_material is provided by the Webcake Storefront MCP server (webcake-storefront-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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