List tax codes.
AI agents call myob_tax_code_list to retrieve information from MYOB Codex MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple list/query operation on tax codes with no side effects. It retrieves reference data only. The server description confirms 'read-only tools by default,' and this listing operation matches that pattern. The blast radius of an AI agent misusing a tax code list is minimal—it only exposes configuration reference data already needed for legitimate business queries.
From the tool's definition Tool name 'myob_tax_code_list' and description 'List tax codes' indicate a read-only operation that retrieves and enumerates existing tax code data without modification.
Attacks that exploit this kind of access
List tax codes. It is categorised as a Read tool in the MYOB Codex MCP MCP Server, which means it retrieves data without modifying state.
Register the MYOB Codex MCP server in PolicyLayer and add a rule for myob_tax_code_list: 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 MYOB Codex MCP. Nothing to install.
myob_tax_code_list 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 myob_tax_code_list 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 myob_tax_code_list. 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.
myob_tax_code_list is provided by the MYOB Codex MCP server (jaeko44/myob-codex-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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