validate_promotion
Check if a promotion code is valid for a given order. Returns isValid, discount amount, and an error code/message if invalid. Use before applying to a checkout.
This record as markdown: /tools/io-favcrm-favcrm/validate-promotion.md
What validate_promotion does on FavCRM
AI agents call validate_promotion to retrieve information from FavCRM without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
amount | number | Yes | Order subtotal in major units (dollars, not cents) |
channel | string | Yes | Where the promo is being applied |
accountId | string | — | Customer account ID — used for per-customer usage limits |
promotionCode | string | Yes | The code customer entered |
Parameters from the server's own tool schema.
Why validate_promotion is rated Low
This tool queries the validity of a promotion code and returns information about it without creating, modifying, deleting, or executing any operations. It is purely a read operation used for validation before checkout. No financial transaction occurs until after checkout (if at all), and the tool itself does not move money or commit financial obligations—it merely validates eligibility.
From the tool's definition Tool description states it 'Check[s] if a promotion code is valid' and 'Returns isValid, discount amount, and an error code/message if invalid.' The verb 'check' and 'returns' indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
The rule that runs validate_promotion safely
PolicyLayer is an MCP gateway: it sits between your AI agents and FavCRM, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For validate_promotion, this is the rule to start with:
validate_promotion is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect FavCRM, apply this rule, and every validate_promotion call is checked against it from then on.
Questions about validate_promotion
Check if a promotion code is valid for a given order. Returns isValid, discount amount, and an error code/message if invalid. Use before applying to a checkout. It is categorised as a Read tool in the FavCRM MCP Server, which means it retrieves data without modifying state.
validate_promotion accepts 4 parameters: amount, channel, accountId, promotionCode. Required: amount, channel, promotionCode. The full parameter table on this page comes from the server's own tool schema.
Register the FavCRM MCP server in PolicyLayer and add a rule for validate_promotion: 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 FavCRM. Nothing to install.
validate_promotion is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the validate_promotion 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 validate_promotion. 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.
validate_promotion is provided by the FavCRM MCP server (https://api.favcrm.io/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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