Add tags to transaction
How to control postTransactionsTransactionIdRelationshipsTags ↓
AI agents use postTransactionsTransactionIdRelationshipsTags to create or update resources in Mcp Upbank — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Upbank environment.
This tool creates or modifies transaction tags, which is a reversible write operation. It does not delete data (unlike its sibling delete tool), does not execute arbitrary code, and does not involve financial transactions themselves—only metadata annotation. The blast radius is low as tag additions are non-destructive and easily removable.
From the tool's definition Tool name 'postTransactionsTransactionIdRelationshipsTags' uses POST method and description states 'Add tags to transaction', indicating creation/modification of transaction metadata.
Documented attack patterns abuse exactly the kind of access postTransactionsTransactionIdRelationshipsTags gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Upbank, and nothing reaches the server without passing your rules. This is the rule we recommend for postTransactionsTransactionIdRelationshipsTags:
{
"version": "1",
"default": "deny",
"tools": {
"postTransactionsTransactionIdRelationshipsTags": {
"limits": [
{
"counter": "posttransactionstransactionidrelationshipstags_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}postTransactionsTransactionIdRelationshipsTags 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.
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Add tags to transaction. It is categorised as a Write tool in the Mcp Upbank MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Upbank MCP server in PolicyLayer and add a rule for postTransactionsTransactionIdRelationshipsTags: 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 Mcp Upbank. Nothing to install.
postTransactionsTransactionIdRelationshipsTags 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 postTransactionsTransactionIdRelationshipsTags 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 postTransactionsTransactionIdRelationshipsTags. 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.
postTransactionsTransactionIdRelationshipsTags is provided by the Mcp Upbank MCP server (sirmews/mcp-upbank). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Upbank, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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13 Mcp Upbank tools catalogued and risk-classified — across an index of 43,000+ MCP servers.