Update existing counterparty details via Counterparty/update (doc 1.22). Nova Poshta only lets you edit a counterparty from creation up until you create a waybill (ІД) with it, so run updates early.
AI agents use counterparty_update to create or update resources in Novaposhta — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Novaposhta environment.
This tool creates or modifies data (counterparty records) in a reversible manner, fitting the Write category. Severity is medium rather than high because: (1) counterparty data modifications are typically bounded in scope to a single business entity record, (2) the impact is reversible/correctable before waybill creation, and (3) there is no financial transaction or irreversible deletion involved.
From the tool's definition Tool name 'counterparty_update' and description explicitly states 'Update existing counterparty details'. The description confirms this modifies data ('edit a counterparty') but is reversible since Nova Poshta permits editing up until a waybill is created.
Attacks that exploit this kind of access
Update existing counterparty details via Counterparty/update (doc 1.22). Nova Poshta only lets you edit a counterparty from creation up until you create a waybill (ІД) with it, so run updates early. It is categorised as a Write tool in the Novaposhta MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Novaposhta MCP server in PolicyLayer and add a rule for counterparty_update: 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 Novaposhta. Nothing to install.
counterparty_update 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 counterparty_update 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 counterparty_update. 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.
counterparty_update is provided by the Novaposhta MCP server (@shopana/novaposhta-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
counterparty_update is one line of Novaposhta's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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