Aggregate signal-only summary of how disputes involving a given Taiwan NHI rejection code (e.g.
AI agents call count_appeal_precedents_for_rejection_code to retrieve information from Opdstar Nhi without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and aggregates historical dispute statistics for a given rejection code. It retrieves data for analysis but does not create, modify, delete, or execute operations. The 'signal-only summary' language confirms it is informational only. No side effects or state changes occur. This is a straightforward data retrieval operation consistent with the 'Read' category.
From the tool's definition Tool name contains 'count' and description describes it as an 'Aggregate signal-only summary' — these are read-only operations that retrieve and summarize existing appeal precedent data without modification, deletion, or execution of arbitrary code.
Attacks that exploit this kind of access
Aggregate signal-only summary of how disputes involving a given Taiwan NHI rejection code (e.g. It is categorised as a Read tool in the Opdstar Nhi MCP Server, which means it retrieves data without modifying state.
Register the Opdstar Nhi MCP server in PolicyLayer and add a rule for count_appeal_precedents_for_rejection_code: 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 Opdstar Nhi. Nothing to install.
count_appeal_precedents_for_rejection_code 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 count_appeal_precedents_for_rejection_code 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 count_appeal_precedents_for_rejection_code. 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.
count_appeal_precedents_for_rejection_code is provided by the Opdstar Nhi MCP server (tatsuju/opdstar-nhi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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